12 November 2020

#Postgresql

#PostgreSql

Key Concepts


S.No Topic Sub-Topics
1 PostgreSQL PostgreSQL, Features, Advantages, Use cases, Editions
2 Installation & Setup Installing on Windows/Linux/Mac, Configuration, pgAdmin setup, Connecting to DB, Environment setup
3 PostgreSQL Architecture Processes, Memory management, Storage architecture, WAL, Transaction management
4 Databases, Schemas, and Tables Creating databases, Schemas overview, Creating tables, Table types, Best practices
5 Data Types Numeric, Character, Boolean, Date/Time, JSON/JSONB
6 Constraints Primary key, Foreign key, Unique, Not null, Check constraints
7 SQL Basics SELECT statements, WHERE clause, ORDER BY, GROUP BY, LIMIT/OFFSET
8 Joins INNER JOIN, LEFT JOIN, RIGHT JOIN, FULL OUTER JOIN, Self join
9 Subqueries Single-row, Multi-row, Correlated subqueries, EXISTS, IN clause
10 Views Creating views, Materialized views, Updating views, Security, Performance considerations
11 Indexes B-Tree, Hash, GIN, GiST, BRIN
12 Sequences Creating sequences, Using in tables, nextval, currval, Sequence options
13 Transactions BEGIN, COMMIT, ROLLBACK, Savepoints, Isolation levels
14 Stored Procedures Creating functions, PL/pgSQL, Parameters, RETURN values, Error handling
15 Triggers Trigger types, BEFORE/AFTER triggers, Row-level, Statement-level, Trigger functions
16 Data Import & Export psql COPY command, pg_dump, pg_restore, CSV import/export, Data migration
17 Full Text Search tsvector, tsquery, Indexing, Ranking, Search functions
18 JSON & JSONB Storing JSON, JSONB vs JSON, Querying JSON, Indexing JSONB, Functions & operators
19 Partitioning Range partitioning, List partitioning, Hash partitioning, Creating partitions, Performance benefits
20 Replication Streaming replication, Synchronous vs asynchronous, Hot standby, Failover, Configuration
21 Backup & Recovery pg_dump, pg_restore, Continuous archiving, PITR, Best practices
22 Performance Tuning Query optimization, EXPLAIN, Index tuning, VACUUM & ANALYZE, Connection pooling
23 Security Authentication, Roles & privileges, GRANT & REVOKE, SSL/TLS, Row-level security
24 Monitoring pg_stat_activity, Logging, Performance metrics, Tools (pgAdmin, Grafana), Alerts
25 Extensions PostGIS, pg_trgm, citext, hstore, Custom extensions
26 Advanced Queries Window functions, CTEs, Recursive queries, Set-returning functions, Advanced joins
27 Database Design ER modeling, Normalization, Denormalization, Index strategy, Schema best practices
28 Cloud PostgreSQL AWS RDS, Google Cloud SQL, Azure Database, Cloud backups, Scaling options
29 Testing & Mocking Unit testing with SQL, Integration testing, Test data setup, pgTAP, Mock databases
30 Projects & Certification Hands-on CRUD project, Performance tuning lab, Replication lab, Cloud deployment project, Certification prep

Interview question

Basic Level

  1. What is PostgreSQL and how is it different from other RDBMS like MySQL or Oracle?
  2. What are the main features of PostgreSQL?
  3. Explain the architecture of PostgreSQL.
  4. How do you install PostgreSQL on Linux and Windows?
  5. What is psql in PostgreSQL?
  6. How do you create a new database in PostgreSQL?
  7. How do you list all databases in PostgreSQL?
  8. What are schemas in PostgreSQL?
  9. How do you connect to a PostgreSQL database using psql?
  10. Explain the difference between CHAR, VARCHAR, and TEXT in PostgreSQL.
  11. How do you create a table in PostgreSQL?
  12. What are the different data types available in PostgreSQL?
  13. How do you insert data into a PostgreSQL table?
  14. How do you update and delete data in PostgreSQL?
  15. What are sequences in PostgreSQL?
  16. How do you create a sequence in PostgreSQL?
  17. What is a primary key in PostgreSQL?
  18. How do you define a foreign key in PostgreSQL?
  19. What are indexes in PostgreSQL?
  20. How do you create an index in PostgreSQL?
  21. What is the difference between DELETE and TRUNCATE?
  22. What is the purpose of the RETURNING clause in PostgreSQL?
  23. How do you enable case-insensitive search in PostgreSQL?
  24. Explain the difference between NULL and an empty string.
  25. How do you backup and restore a PostgreSQL database?

Intermediate Level

  1. What are PostgreSQL system catalogs?
  2. How does PostgreSQL handle transactions?
  3. Explain the concept of MVCC (Multi-Version Concurrency Control).
  4. What is the difference between COMMIT and ROLLBACK?
  5. How do you implement foreign key constraints with cascading actions?
  6. What is a materialized view in PostgreSQL?
  7. How do you refresh a materialized view?
  8. Explain the difference between VIEW and MATERIALIZED VIEW.
  9. What are window functions in PostgreSQL?
  10. How do you use ROW_NUMBER(), RANK(), and DENSE_RANK()?
  11. What are PostgreSQL extensions? Give examples.
  12. What is the pgAdmin tool used for?
  13. How do you monitor queries in PostgreSQL?
  14. What is the EXPLAIN command used for?
  15. How do you optimize queries in PostgreSQL?
  16. Explain the difference between INNER JOIN, LEFT JOIN, RIGHT JOIN, and FULL JOIN.
  17. How do you implement recursive queries in PostgreSQL?
  18. What is the difference between NOW() and CURRENT_DATE?
  19. Explain COALESCE() function in PostgreSQL.
  20. How do you use JSON and JSONB data types in PostgreSQL?
  21. How do you create and query an array column in PostgreSQL?
  22. What are PostgreSQL operators for pattern matching?
  23. Explain IS DISTINCT FROM operator in PostgreSQL.
  24. How do you grant and revoke privileges in PostgreSQL?
  25. What is the role of pg_hba.conf?

Advanced Level

  1. Explain Write-Ahead Logging (WAL) in PostgreSQL.
  2. How does PostgreSQL ensure data consistency?
  3. What are the different types of indexes in PostgreSQL?
  4. When should you use GIN vs BTREE indexes?
  5. Explain Partial Indexes in PostgreSQL.
  6. What is a covering index in PostgreSQL?
  7. How do you implement full-text search in PostgreSQL?
  8. Explain the difference between TO_CHAR() and TO_DATE().
  9. How does PostgreSQL handle concurrency and locking?
  10. What are advisory locks in PostgreSQL?
  11. How does VACUUM work in PostgreSQL?
  12. What is the difference between VACUUM and VACUUM FULL?
  13. What is ANALYZE used for?
  14. How does PostgreSQL query planner work?
  15. What are parallel queries in PostgreSQL?
  16. Explain logical vs physical replication.
  17. How do you configure replication in PostgreSQL?
  18. What are hot standby servers in PostgreSQL?
  19. Explain Point-In-Time Recovery (PITR) in PostgreSQL.
  20. How do you implement partitioning in PostgreSQL?
  21. Explain the difference between range and list partitioning.
  22. What is a foreign data wrapper (FDW)?
  23. How do you connect PostgreSQL with other databases using FDW?
  24. What are stored procedures in PostgreSQL?
  25. How do you write PL/pgSQL functions?

Expert Level

  1. Explain PostgreSQL?s process architecture (postmaster, background workers, autovacuum).
  2. How do you handle deadlocks in PostgreSQL?
  3. What strategies can be used for PostgreSQL performance tuning?
  4. How do you tune work_mem, shared_buffers, and effective_cache_size?
  5. What are PostgreSQL tablespaces?
  6. How do you create and use a tablespace?
  7. What is sharding in PostgreSQL? How can it be implemented?
  8. How does PostgreSQL differ from distributed databases like CockroachDB or Citus?
  9. What is the difference between synchronous and asynchronous replication?
  10. How do you set up synchronous replication?
  11. How do you monitor replication lag in PostgreSQL?
  12. How do you implement high availability (HA) in PostgreSQL?
  13. Explain connection pooling in PostgreSQL.
  14. What is PgBouncer and how is it used?
  15. How do you implement partition pruning in PostgreSQL?
  16. Explain JIT (Just-In-Time) compilation in PostgreSQL.
  17. How do you debug performance issues in PostgreSQL queries?
  18. What are generated columns in PostgreSQL?
  19. How do you implement Row-Level Security (RLS)?
  20. How do you use event triggers in PostgreSQL?
  21. Explain logical decoding in PostgreSQL.
  22. What is WAL archiving and how is it configured?
  23. How does PostgreSQL handle large objects (LOBs)?
  24. What are common PostgreSQL anti-patterns to avoid?
  25. Compare PostgreSQL with NoSQL databases in terms of scalability and flexibility.

Related Topics


11 November 2020

#CoreJava_08

#CoreJava_08

Key Concepts


S.No Topic Sub-Topics
1Java 8 OverviewJava 8 introduction, Why Java 8, Major enhancements, Backward compatibility, Java 8 use cases
2Functional Programming Functional programming basics, Pure functions, Immutability, Stateless behavior, Lambda-driven design
3Lambda Expressions - BasicsLambda syntax, Lambda parameters, Lambda body, Lambda vs anonymous class, Lambda advantages
4Lambda Expressions - AdvancedLambda with collections, Lambda with threads, Lambda with methods, Effectively final variables, Lambda limitations
5Functional Interfaces @FunctionalInterface , Single abstract method, Lambda compatibility, Custom functional interfaces
6Built-in Functional InterfacesPredicate, Function, Consumer, Supplier, Bi-functional interfaces
7Predicate Interfacetest() method, Predicate chaining, and(), or(), negate(), Real-time examples
8Function Interfaceapply() method, Function chaining, compose(), andThen(), Real-time use cases
9Consumer Interfaceaccept() method, Consumer chaining, forEach usage, Logging examples, Printing data
10Supplier Interfaceget() method, Lazy value generation, Supplier vs Function, Factory usage, Random value generation
11Method ReferencesStatic method reference, Instance method reference, Constructor reference, Syntax (::), Lambda replacement
12Stream API - IntroductionWhat is stream, Stream vs collection, Stream pipeline, Intermediate operations, Terminal operations
13Stream CreationStream from collection, Stream.of(), Arrays.stream(), Infinite streams, Empty streams
14Stream Intermediate Operationsfilter(), map(), flatMap(), distinct(), sorted()
15Stream Terminal OperationsforEach(), collect(), reduce(), count(), findFirst()
16Stream CollectorsCollectors.toList(), toSet(), toMap(), groupingBy(), partitioningBy()
17Stream Reduction Operationsreduce() method, Identity value, Accumulator, Combiner, Aggregation examples
18Parallel StreamsparallelStream(), ForkJoinPool, Performance benefits, Thread safety issues, When to use parallel streams
19Optional ClassOptional creation, isPresent(), ifPresent(), orElse(), orElseThrow()
20Default Methods in InterfaceDefault method syntax, Multiple inheritance resolution, Diamond problem, Overriding defaults, Use cases
21Static Methods in InterfaceStatic method rules, Invocation syntax, Difference from default methods, Utility methods, Best practices
22ForEach MethodIterable forEach(), Lambda usage, Method reference usage, Internal iteration, Comparison with loops
23Nashorn JavaScript EngineNashorn overview, JavaScript execution, ScriptEngine API, Java-JS interaction, Use cases
24New Date & Time API - BasicsProblems with old Date API, LocalDate, LocalTime, LocalDateTime, Immutability
25New Date & Time API - AdvancedZonedDateTime, Period, Duration, DateTimeFormatter, Time zones
26CompletableFutureFuture limitations, CompletableFuture basics, Async execution, thenApply(), thenAccept()
27Collectors Grouping & PartitioninggroupingBy(), partitioningBy(), downstream collectors, Multi-level grouping, Real examples
28Stream PerformanceLazy evaluation, Short-circuiting, Stream reuse rules, Avoiding side effects, Performance tuning
29Java 8 Coding PatternsFilter-map-reduce pattern, Functional pipelines, Optional usage patterns, Lambda best practices, Stream refactoring
30Java 8 Revision & Interview PrepJava 8 feature recap, Common interview questions, Coding scenarios, Performance discussions, Best practices

Interview question

Basic Level

  1. What are the major features introduced in Java 8?
  2. Why was Java 8 introduced?
  3. What is functional programming in Java 8?
  4. What is a lambda expression?
  5. What problems do lambda expressions solve?
  6. What is the syntax of a lambda expression?
  7. Difference between lambda expression and anonymous class?
  8. What is a functional interface?
  9. What is @FunctionalInterface annotation?
  10. Can a functional interface have default methods?
  11. Can a functional interface have static methods?
  12. What are built-in functional interfaces?
  13. What is Predicate interface?
  14. What is Function interface?
  15. What is Consumer interface?
  16. What is Supplier interface?
  17. What is method reference?
  18. Types of method references?
  19. What is Stream API?
  20. Why streams are introduced?
  21. Difference between stream and collection?
  22. What is stream pipeline?
  23. What are intermediate operations?
  24. What are terminal operations?
  25. What is forEach() method?

Intermediate Level

  1. How to create a stream?
  2. What is filter() in streams?
  3. What is map() in streams?
  4. Difference between map() and flatMap()?
  5. What is distinct()?
  6. What is sorted()?
  7. What is limit() and skip()?
  8. What is collect()?
  9. What is Collectors class?
  10. What is Collectors.toList()?
  11. What is Collectors.toSet()?
  12. What is Collectors.toMap()?
  13. What is groupingBy()?
  14. What is partitioningBy()?
  15. Difference between groupingBy and partitioningBy?
  16. What is reduce() operation?
  17. What is Optional class?
  18. Why Optional was introduced?
  19. How to create Optional?
  20. Difference between orElse() and orElseGet()?
  21. What is ifPresent()?
  22. What are default methods?
  23. Why default methods are introduced?
  24. What is static method in interface?
  25. Can we override default methods?

Advanced Level

  1. How lambda expressions work internally?
  2. What is effectively final variable?
  3. Why local variables must be effectively final in lambda?
  4. How streams process data internally?
  5. What is lazy evaluation in streams?
  6. What is short-circuiting in streams?
  7. What is findFirst()?
  8. What is findAny()?
  9. Difference between findFirst and findAny?
  10. What is anyMatch(), allMatch(), noneMatch()?
  11. What are parallel streams?
  12. Difference between stream() and parallelStream()?
  13. When should we use parallel streams?
  14. Problems with parallel streams?
  15. What is ForkJoinPool?
  16. How parallel stream uses ForkJoinPool?
  17. What is Java 8 Date and Time API?
  18. Problems with old Date API?
  19. What is LocalDate?
  20. What is LocalTime?
  21. What is LocalDateTime?
  22. What is ZonedDateTime?
  23. What is Period?
  24. What is Duration?
  25. What is DateTimeFormatter?

Expert Level

  1. How groupingBy works internally?
  2. What are downstream collectors?
  3. How to perform multi-level grouping?
  4. How reduce() works internally?
  5. Difference between reduce() and collect()?
  6. How Optional avoids NullPointerException?
  7. Anti-patterns of Optional?
  8. Exception handling in lambda expressions?
  9. Exception handling in streams?
  10. How to debug stream pipelines?
  11. Performance comparison: stream vs loop?
  12. When streams should be avoided?
  13. CompletableFuture introduction?
  14. Difference between Future and CompletableFuture?
  15. What is thenApply()?
  16. What is thenAccept()?
  17. What is thenCombine()?
  18. What is async execution in Java 8?
  19. What is Nashorn JavaScript engine?
  20. Use cases of Nashorn?
  21. Best practices for lambda expressions?
  22. Best practices for Stream API?
  23. Java 8 real-time project use cases?
  24. Common Java 8 interview traps?
  25. Java 8 coding round expectations?

Related Topics


   Functional Interfaces   
   Lambda Expressions   
   Stream API   
   Built-in Functional Interfaces   
   Optional Class   
   Default Method   

10 November 2020

#Azure


Key Concepts


Group Azure Service Main Purpose AI / Agentic AI Use
1. AI Platform Microsoft Foundry Central AI development platform AI apps, agents, models, evaluation
Azure OpenAI Foundation models LLM, chat, embeddings, reasoning
Foundry Agent Service Managed agents Agent creation, orchestration, deployment
Azure Machine Learning ML platform Training, MLOps, custom models
2. AI Search & RAG Azure AI Search Search + vector retrieval RAG, grounding, semantic search
Azure Cosmos DB NoSQL + vector capabilities Agent memory, state, vector data
Azure Database for PostgreSQL Relational database Application data, AI workloads
Azure Cache for Redis In-memory data store Session/state/cache for agents
3. AI Content Processing Azure AI Document Intelligence Document extraction PDF, invoice, form, document RAG
Azure AI Content Understanding Content analysis Documents, images, audio, video
Azure AI Language NLP Entity extraction, classification, summarization
Azure AI Vision Image analysis Computer vision, image understanding
Azure AI Speech Speech processing Voice assistants and voice agents
Azure AI Content Safety AI safety Prompt/output safety and moderation
4. Agent & Tool Execution Azure Functions Serverless execution Agent tools, functions, API actions
Azure App Service Application hosting AI APIs and web applications
Azure Container Apps Container workloads AI microservices and agents
AKS Kubernetes Enterprise agent deployment
Azure API Management API gateway Agent tools, APIs, security
5. Agent Communication Azure Service Bus Enterprise messaging Agent workflows, async tasks
Azure Event Hubs Event streaming Real-time AI events
Azure Event Grid Event routing Event-driven agents
Azure Storage Queues Simple queues Background AI processing
6. Data & Storage Azure Blob Storage Object storage Documents, datasets, files
Azure Data Lake Storage Gen2 Data lake Large AI/ML datasets
Azure Files Managed file shares Shared AI application files
Azure SQL Database Relational database Structured application data
7. Containers Azure Container Registry Container registry Store AI application images
Azure Kubernetes Service Container orchestration Production AI agents
Azure Container Apps Serverless containers Lightweight AI services
8. Identity & Security Microsoft Entra ID Identity platform User/agent authentication
Managed Identity Azure resource identity Passwordless service-to-service access
Azure Key Vault Secrets management API keys, certificates, secrets
Microsoft Defender for Cloud Cloud security AI workload security
Azure AI Content Safety AI safety controls Prompt injection/content protection
9. Networking Azure Virtual Network Private networking Secure AI architecture
Private Link Private service access Secure Azure AI connectivity
Azure Firewall Network protection Enterprise AI network security
Application Gateway Application routing Secure AI application ingress
Load Balancer Traffic distribution Scalable AI workloads
10. Monitoring & Observability Azure Monitor Platform monitoring AI infrastructure monitoring
Application Insights Application telemetry Agent/API tracing
Log Analytics Log analysis Agent execution diagnostics
Azure Managed Grafana Visualization AI system dashboards
11. DevOps & Deployment Azure DevOps CI/CD AI application delivery
Azure Pipelines Build/deployment Automated AI deployments
Azure Repos Source control AI application code
Azure Artifacts Package management Dependencies
GitHub Actions + Azure CI/CD AI application automation
12. Data Engineering Azure Data Factory Data integration AI data pipelines
Azure Databricks Data + AI platform ML, Spark, feature engineering
Azure Synapse Analytics Analytics Enterprise AI data workloads
Event Hubs Streaming ingestion Real-time AI pipelines
13. Governance & AI Operations Microsoft Foundry evaluation capabilities AI evaluation Quality, groundedness, performance
Azure Policy Governance Control AI infrastructure
Azure Resource Manager Resource management Infrastructure automation
Azure Cost Management Cost control Monitor LLM/cloud costs
Azure Monitor AI observability Production monitoring

Interview question

What is Microsoft Foundry and how is it used for AI application development?
What is Azure OpenAI and how does it support Generative AI applications?
What is the difference between Microsoft Foundry and Azure OpenAI?
What are Foundation Models and how are they used in Azure AI solutions?
How do you select an appropriate model for an enterprise AI application?
How do you deploy a model in Azure OpenAI?
How do you manage model versions and deployments in Azure?
How do you control Azure OpenAI token usage and costs?
How do you design a production-ready Azure OpenAI architecture?
How do you handle Azure OpenAI quotas and rate limits?
What is Generative AI and how does Azure support Generative AI development?
What is the difference between an LLM, SLM and Foundation Model?
How does inference work with Azure OpenAI models?
What are temperature, top-p, max tokens and seed parameters?
How do you control hallucinations in an Azure Generative AI application?
How do you handle context-window limitations in Azure OpenAI?
How do you generate structured JSON responses from Azure OpenAI?
How do you implement reusable prompt templates in Microsoft Foundry?
How do you evaluate the quality of an LLM response?
How do you design an enterprise-grade Generative AI solution on Azure?
What is prompt engineering?
What is the difference between zero-shot, one-shot and few-shot prompting?
How do system, user and developer instructions differ in an AI application?
How do you design prompts for enterprise AI applications?
How do you protect Azure OpenAI applications from prompt injection?
How do you make LLM responses more deterministic?
How do you create reusable and versioned prompts?
How do you evaluate different prompt versions?
How do you reduce token consumption through prompt optimization?
How would you troubleshoot poor LLM responses caused by prompting?
What is Retrieval-Augmented Generation (RAG)?
How do you implement RAG using Azure AI services?
What is Azure AI Search and why is it important for RAG?
How does Azure AI Search work internally in a RAG architecture?
How do you ingest documents into Azure AI Search?
How do you choose an appropriate document chunking strategy?
What are embeddings and how are they used in Azure RAG solutions?
How do you select an embedding model for Azure AI Search?
What is vector search and how does it differ from keyword search?
How do you improve retrieval accuracy in an Azure RAG application?
What is hybrid search in Azure AI Search?
How do you implement semantic ranking in Azure AI Search?
How do you implement metadata filtering in Azure AI Search?
How do you prevent irrelevant documents from being retrieved?
How do you evaluate RAG retrieval quality?
How do you troubleshoot hallucinations in an Azure RAG pipeline?
How do you implement citation and source grounding in RAG?
How do you design a scalable enterprise RAG architecture on Azure?
What is an AI Agent?
How are AI Agents different from traditional LLM applications?
What are the major components of an AI Agent?
What is Foundry Agent Service?
How does an Azure AI Agent perform tool calling?
How do you connect an AI Agent to enterprise APIs?
How do you implement memory for an AI Agent?
How do you implement multi-step workflows for AI Agents?
How do you design a multi-agent architecture on Azure?
How do you integrate MCP with Azure AI Agents?
How do you secure an AI Agent that can execute business operations?
How do you prevent an AI Agent from executing unauthorized tools?
How do you monitor and debug an autonomous AI Agent?
How do you evaluate AI Agent reliability and task completion?
How would you build a production-ready Agentic AI system on Azure?
How can Azure Functions be used as tools for AI Agents?
How can Azure API Management be used to expose Agent tools?
How can Azure Service Bus support asynchronous Agent workflows?
How can Azure Event Hubs support real-time AI applications?
How can Azure Event Grid be used in event-driven Agent architectures?
How do you implement retries and failure handling in Agent workflows?
What is Azure Machine Learning and when should it be used?
When would you choose Azure Machine Learning instead of Azure OpenAI?
How do you train a custom machine learning model using Azure Machine Learning?
How do you fine-tune AI models on Azure?
How do you deploy ML models using managed online endpoints?
What is batch inference and when would you use it?
How do you implement MLOps using Azure Machine Learning?
How do you monitor machine learning models in production?
How is Azure Blob Storage used in AI and RAG architectures?
How is Azure Data Lake Storage Gen2 used for AI data engineering?
How is Azure AI Document Intelligence used in an enterprise RAG pipeline?
How do you extract structured information from PDFs using Azure AI services?
How do Cosmos DB and PostgreSQL support AI application data?
How do you implement Agent memory using Azure Cosmos DB?
How do you secure Azure OpenAI using Microsoft Entra ID?
How do Managed Identities improve security in Azure AI applications?
How do you use Azure Key Vault to protect AI application secrets?
How do you implement network isolation for an enterprise Azure AI application?
How do you protect AI applications against data leakage and prompt injection?
How does Azure AI Content Safety protect Generative AI applications?
How do you implement responsible AI controls in Azure?
How do you monitor Azure OpenAI applications using Azure Monitor?
How do you trace AI application requests using Application Insights?
What metrics should be monitored for a production RAG application?
How do you monitor LLM latency, token usage and AI application cost?
How do you troubleshoot a production AI application using Azure Monitor and Application Insights?
How would you design an enterprise RAG application using Azure OpenAI, AI Search and Blob Storage?
How would you design a scalable Agentic AI platform using Microsoft Foundry?
How would you build a secure multi-tenant Generative AI application on Azure?
How would you design an AI application capable of handling millions of requests?
How would you reduce the cost of a production Azure Generative AI application?
How would you integrate a Java Spring Boot application with Azure OpenAI?
How would you integrate Kafka or Azure Event Hubs with an AI Agent architecture?
How would you design an end-to-end Agentic RAG solution using Azure OpenAI, AI Search, Functions and Cosmos DB?
How would you implement CI/CD for an Azure AI application?
How would you design a production-grade Azure Agentic AI platform with security, observability, scalability and governance?

Related Topics


#GraphQL

#GraphQL

Key Concepts


S.No Topic Sub-Topics
1 GraphQL What is GraphQL?, Features, Advantages, Use cases, REST vs GraphQL
2 GraphQL Architecture Server, Client, Schema, Resolver, Type System
3 Setting Up GraphQL Installation, Apollo Server, GraphQL Yoga, Express integration, Node.js setup
4 GraphQL Schema Type definitions, Scalars, Object types, Enums, Interfaces
5 Queries Basic queries, Nested queries, Arguments, Aliases, Fragments
6 Mutations Creating mutations, Arguments, Input types, Payloads, Return values
7 Resolvers Query resolvers, Mutation resolvers, Field resolvers, Parent and args, Context
8 GraphQL Types Scalar types, Object types, Enum types, Union types, Input types
9 Variables Query variables, Mutation variables, Default values, Validation, Security
10 Fragments Reusable fragments, Fragment syntax, Nested fragments, Inline fragments, Best practices
11 Directives @include, @skip, @deprecated, Custom directives, Use cases
12 GraphQL Playground & Tools GraphiQL, Apollo Studio, Insomnia, Postman, Playground setup
13 Error Handling Errors in resolvers, Formatting errors, Error codes, Logging, Best practices
14 Authentication & Authorization JWT tokens, OAuth integration, Role-based access, Context handling, Securing endpoints
15 Pagination Offset-based, Cursor-based, Relay style, Performance optimization, Best practices
16 Filtering & Sorting Query filters, Logical operators, Sorting by fields, Nested filters, Best practices
17 GraphQL Subscriptions Real-time updates, WebSockets, Setup with Apollo, Publish/Subscribe model, Use cases
18 Batching & Caching DataLoader, Query batching, Response caching, Client-side caching, Server-side caching
19 Performance Optimization Query complexity analysis, Caching, Persisted queries, Lazy loading, Resolver optimization
20 GraphQL with Databases SQL integration, NoSQL integration, ORM usage, Query mapping, Data fetching strategies
21 GraphQL Federation Microservices architecture, Apollo Federation, Schema stitching, Resolver delegation, Best practices
22 Schema Design Best Practices Modular schemas, Naming conventions, Versioning, Documentation, Extensibility
23 Testing GraphQL APIs Unit tests, Integration tests, Mocking resolvers, Jest, Apollo testing utilities
24 Security Best Practices Query depth limiting, Query cost analysis, Authentication, Authorization, Input validation
25 GraphQL Clients Apollo Client, Relay, URQL, React integration, Angular/ Vue integration
26 GraphQL Server Deployment Hosting options, Docker deployment, Kubernetes, Scaling, Monitoring
27 Versioning & Maintenance Schema evolution, Deprecating fields, Backward compatibility, Documentation, Change management
28 Advanced Features Union types, Interfaces, Custom scalars, Schema stitching, Middleware
29 Hands-on Projects CRUD API project, Real-time chat app, E-commerce API, Social media API, Analytics dashboard API
30 Certification & Career Path GraphQL certification, Job roles, Portfolio projects, Learning resources, Career opportunities

Interview question

Basic

  1. What is GraphQL?
  2. Who developed GraphQL?
  3. What are the main benefits of GraphQL over REST?
  4. What is a GraphQL schema?
  5. What are queries in GraphQL?
  6. What are mutations in GraphQL?
  7. What are subscriptions in GraphQL?
  8. What is a resolver in GraphQL?
  9. What is the difference between query and mutation?
  10. What are GraphQL types?
  11. What are scalar types in GraphQL?
  12. What are enums in GraphQL?
  13. What are lists in GraphQL?
  14. What are non-null types in GraphQL?
  15. What is introspection in GraphQL?
  16. What is a fragment in GraphQL?
  17. What are directives in GraphQL?
  18. What is the default HTTP method for GraphQL requests?
  19. How is GraphQL strongly typed?
  20. What is the difference between GraphQL and SQL?
  21. Can GraphQL work without a database?
  22. What is the role of __typename in GraphQL?
  23. What is batching in GraphQL?
  24. What is the purpose of GraphQL variables?
  25. What are the limitations of GraphQL?

Intermediate

  1. What is the role of GraphQL schema definition language (SDL)?
  2. How do you define custom scalar types in GraphQL?
  3. Explain input types in GraphQL.
  4. What are unions in GraphQL?
  5. What are interfaces in GraphQL?
  6. How do you validate GraphQL queries?
  7. How does GraphQL handle versioning?
  8. What are the best practices for naming in GraphQL schema?
  9. What is query complexity analysis?
  10. How does GraphQL handle over-fetching and under-fetching?
  11. What are nested resolvers?
  12. What is the N+1 problem in GraphQL?
  13. How can you solve the N+1 problem in GraphQL?
  14. What is DataLoader in GraphQL?
  15. How does GraphQL handle error reporting?
  16. What are partial responses in GraphQL?
  17. How does GraphQL differ from gRPC?
  18. How do you use variables with fragments in GraphQL?
  19. How does caching work in GraphQL?
  20. What is persisted queries in GraphQL?
  21. What is GraphQL Playground?
  22. What is Apollo Server?
  23. What is Relay in GraphQL?
  24. How do GraphQL subscriptions work with WebSockets?
  25. What are the security concerns in GraphQL?

Advanced

  1. What are GraphQL Federation and schema stitching?
  2. What is Apollo Federation?
  3. What is the difference between schema stitching and federation?
  4. What is GraphQL Gateway?
  5. How do you implement authentication in GraphQL?
  6. How do you implement authorization in GraphQL?
  7. What are GraphQL directives and how do you create custom ones?
  8. How do you handle file uploads in GraphQL?
  9. What is GraphQL mesh?
  10. What are GraphQL unions vs interfaces?
  11. How do you implement batching in GraphQL resolvers?
  12. What are best practices for designing GraphQL mutations?
  13. How do you handle pagination in GraphQL?
  14. What are Relay-style pagination and connections?
  15. How do you handle rate limiting in GraphQL APIs?
  16. What is query depth limiting in GraphQL?
  17. How does GraphQL handle subscriptions at scale?
  18. How does GraphQL integrate with microservices?
  19. How do you monitor GraphQL performance?
  20. How do you trace GraphQL queries in production?
  21. What is schema federation in Apollo?
  22. What are schema delegation techniques in GraphQL?
  23. How do you modularize large GraphQL schemas?
  24. What is GraphQL schema stitching middleware?
  25. What are GraphQL schema directives for logging and tracing?

Expert

  1. How do you secure GraphQL APIs against DoS attacks?
  2. What is query cost analysis in GraphQL?
  3. How do you handle caching in GraphQL at scale?
  4. How do you integrate GraphQL with REST APIs?
  5. How do you integrate GraphQL with gRPC?
  6. How do you optimize GraphQL queries in production?
  7. What are advanced DataLoader patterns?
  8. How do you implement GraphQL schema federation in microservices architecture?
  9. How do you version GraphQL schemas in large organizations?
  10. How does GraphQL fit into Event-Driven Architectures (EDA)?
  11. How do you monitor and log GraphQL errors?
  12. How do you integrate GraphQL with Kafka?
  13. How do you handle real-time updates in GraphQL at scale?
  14. What is Apollo Gateway architecture?
  15. How do you build resilient GraphQL APIs?
  16. What are GraphQL SDL limitations and solutions?
  17. How do you implement GraphQL authorization at field level?
  18. How do you manage breaking changes in GraphQL APIs?
  19. What are GraphQL best practices for microfrontends?
  20. How do you design GraphQL APIs for large-scale enterprise systems?
  21. What is GraphQL-over-HTTP vs GraphQL-over-WebSockets?
  22. How do you handle federation across multiple teams in GraphQL?
  23. What are common GraphQL anti-patterns?
  24. What is the future of GraphQL in API design?
  25. Compare GraphQL, REST, gRPC, and OData for enterprise use cases.

Related Topics


08 November 2020

#Hibernate

#Hibernate

Key Concepts


S.No Topic Sub-Topics
1 Introduction to Hibernate What is Hibernate?, Features, Advantages, ORM concept, Use cases
2 Hibernate Architecture Configuration, SessionFactory, Session, Transaction, Query Interface
3 Environment Setup Hibernate installation, IDE setup, Database setup, Maven/Gradle dependencies, Configuration files
4 Hibernate Configuration hibernate.cfg.xml, hibernate.properties, DataSource configuration, Dialects, Connection pooling
5 Entity Mapping @Entity annotation, @Table annotation, @Id annotation, @Column annotation, Mapping strategies
6 Primary Key Generation IDENTITY, SEQUENCE, TABLE, AUTO, Custom generators
7 Hibernate Session Opening session, Closing session, SessionFactory, Session methods, Best practices
8 CRUD Operations Save, Update, Delete, Load, Get
9 Hibernate Query Language (HQL) Basics of HQL, SELECT queries, WHERE clause, JOINs, Aggregation functions
10 Criteria API Creating Criteria, Restrictions, Projections, Ordering, Pagination
11 Native SQL Queries Executing SQL, Result mapping, Named queries, Parameters, Pagination
12 Associations in Hibernate One-to-One, One-to-Many, Many-to-One, Many-to-Many, Mapping strategies
13 Collection Mapping List, Set, Map, Bag, Array mapping
14 Inheritance Mapping Single Table strategy, Table per Class strategy, Joined strategy, Discriminator column, Annotations
15 Component Mapping Embedded objects, @Embeddable, @Embedded annotation, Reusability, Nested components
16 Hibernate Caching First-level cache, Second-level cache, Query cache, Cache providers, Configuration
17 Hibernate Transactions Transaction API, ACID properties, Commit, Rollback, Transaction propagation
18 Lazy vs Eager Loading Lazy loading, Eager loading, FetchType, Performance impact, Use cases
19 Hibernate Event Listeners PreInsert, PostInsert, PreUpdate, PostUpdate, Configuration
20 Hibernate Interceptors Session interceptor, Methods, Custom interceptors, Performance, Use cases
21 Hibernate Validator Bean validation, @NotNull, @Size, Custom constraints, Integration
22 Hibernate Filters Defining filters, Enabling filters, Parameters, Dynamic filtering, Use cases
23 Named Queries Defining queries, Using @NamedQuery, Using @NamedNativeQuery, Parameters, Reusability
24 Batch Processing Bulk insert, Bulk update, Stateless session, JDBC batch, Performance optimization
25 Optimistic & Pessimistic Locking Optimistic locking, Pessimistic locking, Versioning, Lock modes, Concurrency control
26 Hibernate with Spring Spring ORM, SessionFactory integration, Transaction management, DAO pattern, Configuration
27 Performance Tuning Query optimization, Fetch strategies, Caching strategies, Connection pooling, Monitoring tools
28 Logging & Monitoring Hibernate logging, SQL logging, Statistics, JMX monitoring, Tools
29 Projects & Hands-on Labs CRUD project, Association mapping project, Inheritance mapping project, Caching project, Spring integration project
30 Certification & Career Path Hibernate certification, Job roles, Learning resources, Real-time projects, Best practices

Interview question

Basic

  1. What is Hibernate?
  2. Difference between Hibernate and JDBC?
  3. What are the advantages of Hibernate ORM?
  4. What is JPA and how is it related to Hibernate?
  5. Explain ORM in simple terms.
  6. What is the role of hibernate.cfg.xml?
  7. What is the use of SessionFactory?
  8. What is the difference between Session and SessionFactory?
  9. Explain the lifecycle of a Hibernate Session.
  10. What are persistent objects in Hibernate?
  11. What is the difference between transient, persistent, and detached objects?
  12. Explain the role of @Entity annotation.
  13. How do you map a table to a class in Hibernate?
  14. What is @Id and @GeneratedValue annotation used for?
  15. How do you configure database connection in Hibernate?
  16. What is Hibernate Dialect?
  17. Explain HQL (Hibernate Query Language).
  18. What is the difference between HQL and SQL?
  19. How do you perform CRUD operations in Hibernate?
  20. What is the default fetching strategy in Hibernate?
  21. Difference between get() and load() methods?
  22. What are named queries in Hibernate?
  23. Explain the role of @Table annotation.
  24. What is the use of hibernate.properties file?
  25. Explain the difference between save(), persist(), and saveOrUpdate().

Intermediate

  1. What are the different types of entity mapping in Hibernate?
  2. How do you implement one-to-one mapping in Hibernate?
  3. How do you implement one-to-many mapping in Hibernate?
  4. How do you implement many-to-many mapping in Hibernate?
  5. Explain cascading in Hibernate.
  6. What is lazy loading in Hibernate?
  7. Difference between lazy and eager fetching?
  8. What is the N+1 select problem?
  9. How to solve N+1 problem in Hibernate?
  10. What are embedded objects in Hibernate?
  11. Explain inheritance mapping strategies in Hibernate.
  12. Difference between Single Table and Joined strategy?
  13. How do you configure table per class hierarchy?
  14. What is the role of @Inheritance annotation?
  15. Explain the role of @MappedSuperclass.
  16. What are Hibernate annotations used for composite keys?
  17. How do you handle versioning in Hibernate?
  18. Explain optimistic and pessimistic locking.
  19. What is Hibernate Criteria API?
  20. Difference between HQL and Criteria API?
  21. What are projections in Criteria API?
  22. How do you add restrictions in Criteria API?
  23. What is the use of CriteriaBuilder in JPA?
  24. How do you perform pagination in Hibernate?
  25. Difference between Query, TypedQuery, and CriteriaQuery?

Advanced

  1. What is the role of Session.flush()?
  2. What is the difference between flush() and commit()?
  3. Explain clear() and evict() methods.
  4. How do you detach an entity in Hibernate?
  5. What is the use of merge() in Hibernate?
  6. What is the difference between merge() and update()?
  7. What is the first-level cache in Hibernate?
  8. What is the second-level cache in Hibernate?
  9. What cache providers can be used with Hibernate?
  10. What is query-level cache in Hibernate?
  11. How do you configure Ehcache in Hibernate?
  12. Explain Hibernate?s integration with Spring.
  13. What is the role of LocalSessionFactoryBean in Spring?
  14. How do you configure transaction management in Spring + Hibernate?
  15. Difference between programmatic and declarative transactions?
  16. What are Interceptors in Hibernate?
  17. Difference between Interceptor and EventListener?
  18. Explain entity lifecycle events in Hibernate.
  19. How do you use Hibernate with stored procedures?
  20. How do you map native SQL queries in Hibernate?
  21. What are named native queries?
  22. How do you log SQL queries in Hibernate?
  23. Explain batch processing in Hibernate.
  24. How do you configure batch size in Hibernate?
  25. What is StatelessSession in Hibernate?

Expert

  1. What are best practices for Hibernate performance tuning?
  2. How do you optimize Hibernate for large datasets?
  3. How do you use Fetch Joins in Hibernate?
  4. Explain DTO projection using Hibernate.
  5. What is Hibernate Validator and how is it used?
  6. What is JSR-303 Bean Validation in Hibernate?
  7. How do you configure custom validators in Hibernate?
  8. What is a proxy object in Hibernate?
  9. What are bytecode enhancement techniques in Hibernate?
  10. Explain dirty checking in Hibernate.
  11. How does Hibernate detect changes in entities?
  12. What is Hibernate Envers?
  13. How do you implement auditing in Hibernate?
  14. Explain multi-tenancy support in Hibernate.
  15. Difference between schema, database, and discriminator-based multi-tenancy?
  16. How does Hibernate integrate with NoSQL databases?
  17. What is Hibernate OGM?
  18. Explain Hibernate Search and its use cases.
  19. How does Hibernate integrate with Elasticsearch?
  20. Explain polyglot persistence with Hibernate.
  21. How do you handle migration and versioning with Hibernate?
  22. How do you integrate Hibernate with Flyway or Liquibase?
  23. How do you debug Hibernate performance issues?
  24. How does Hibernate differ from JPA, MyBatis, and EclipseLink?
  25. Future of Hibernate: How does it fit into modern microservices and cloud-native architectures?

Related Topics


#Apache Spark


Key Concepts


Day Topic Sub Topics
1 Introduction Spark, Hadoop vs Spark, Spark Architecture, Components, Cluster Manager, Spark Ecosystem, Use Cases
2 Spark Installation & Setup Install Spark, Java Setup, Python Setup, Scala Setup, Spark Shell, IDE Setup, Local Mode
3 Spark Fundamentals Driver, Executor, Cluster, Worker Nodes, DAG, Lazy Evaluation, Actions vs Transformations
4 Spark Core API SparkContext, SparkSession, Creating RDDs, Parallelize, Text File Input, Spark UI
5 RDD Immutable Collections, Partitioning, Narrow vs Wide Transformations, Lineage, Fault Tolerance
6 RDD Transformations map(), flatMap(), filter(), distinct(), union(), intersection(), sample(), cartesian()
7 RDD Actions collect(), count(), first(), take(), reduce(), aggregate(), saveAsTextFile(), foreach()
8 Pair RDD Key-Value Pair, reduceByKey(), groupByKey(), combineByKey(), sortByKey(), join(), cogroup()
9 Partitioning HashPartitioner, RangePartitioner, Repartition, Coalesce, Partition Strategy, Skew Handling
10 Shared Variables Broadcast Variables, Accumulators, Custom Accumulators, Performance Benefits
11 Spark SQL Introduction DataFrames, Datasets, Schema, Catalyst Optimizer, Tungsten Engine
12 DataFrame Operations select(), filter(), where(), alias(), withColumn(), drop(), distinct(), rename()
13 DataFrame Functions Built-in Functions, String Functions, Date Functions, Math Functions, Conditional Functions
14 DataFrame Aggregation groupBy(), agg(), sum(), avg(), count(), min(), max(), pivot()
15 DataFrame Join Inner Join, Left Join, Right Join, Full Join, Cross Join, Broadcast Join
16 Window Functions row_number(), rank(), dense_rank(), lag(), lead(), running totals, partitionBy()
17 Spark SQL SQL Queries, Temporary Views, Global Views, SQL Optimization, Explain Plan
18 Reading Data Sources CSV, JSON, Parquet, ORC, Avro, XML, JDBC
19 Writing Data Sources Save Modes, Partitioned Output, Bucketing, Compression, JDBC Writes
20 Performance Optimization Cache(), Persist(), Checkpoint, Serialization, Memory Management, Shuffle Optimization
21 Spark Performance Tuning Executor Memory, Core Allocation, Dynamic Allocation, AQE, Broadcast Threshold
22 Spark Streaming Streaming Concepts, DStreams, Structured Streaming, Sources, Sinks
23 Structured Streaming Watermarking, Event Time, Processing Time, Output Modes, Checkpointing
24 Spark with Kafka Kafka Integration, Read Streams, Write Streams, Consumer Groups, Offset Management
25 Spark with Delta Lake & Iceberg ACID Tables, Time Travel, Merge, Update, Delete, Schema Evolution
26 Spark on Cloud Azure Databricks, AWS EMR, Google Dataproc, Spark on Kubernetes, Cluster Deployment
27 Spark Testing Unit Testing, DataFrame Testing, Mock Data, Debugging, Logging, Spark UI Analysis
28 Spark Security Authentication, Authorization, Encryption, Kerberos, SSL, Data Governance
29 Real-Time Projects ETL Pipeline, Log Processing, Banking Transactions, Recommendation Engine, Data Lake Processing
30 Interview Preparation Architecture Questions, Coding Questions, Optimization Scenarios, Performance Debugging, Best Practices

Interview question

What is Apache Spark?
Why is Apache Spark used for big data processing?
What are the key features of Apache Spark?
What are the main components of Apache Spark?
What is Spark Core?
What is Spark SQL?
What is Spark Structured Streaming?
What is MLlib?
What is GraphX?
What is PySpark?
What is the difference between Spark and Hadoop MapReduce?
What is the Spark architecture?
What is a Spark Driver?
What is a Spark Executor?
What is a Spark Cluster Manager?
What is a Spark Application?
What is a Spark Job?
What is a Spark Stage?
What is a Spark Task?
How does Spark execute an application?
What is an RDD?
What are the characteristics of RDDs?
What is RDD lineage?
What is RDD fault tolerance?
What is lazy evaluation in Spark?
What are transformations in Spark?
What are actions in Spark?
What is the difference between transformations and actions?
What is a narrow transformation?
What is a wide transformation?
What is a shuffle in Spark?
Why is shuffle expensive in Spark?
What is partitioning in Spark?
What is a partition?
How does Spark determine the number of partitions?
What is repartition()?
What is coalesce()?
What is the difference between repartition() and coalesce()?
What is caching in Spark?
What is persistence in Spark?
What is the difference between cache() and persist()?
What are Spark storage levels?
What is a broadcast variable?
What is an accumulator?
What are broadcast joins?
What is a DataFrame in Spark?
What is a Dataset in Spark?
What is the difference between RDD, DataFrame, and Dataset?
Why are DataFrames preferred over RDDs?
What is Spark SQL?
What is the Catalyst Optimizer?
What is the Tungsten execution engine?
What is whole-stage code generation?
What is the Spark SQL execution plan?
What are logical and physical plans in Spark?
What is Adaptive Query Execution?
How does AQE improve Spark performance?
What is predicate pushdown?
What is column pruning?
What is partition pruning?
What is bucketing in Spark?
What is a window function in Spark SQL?
How do joins work in Spark?
What are the different join strategies in Spark?
What is a broadcast hash join?
What is a sort-merge join?
What is a shuffled hash join?
What is a Cartesian join?
How do you optimize joins in Spark?
What is data skew in Spark?
How do you identify data skew in Spark?
How do you handle data skew in Spark?
What is the salting technique in Spark?
What is Spark Structured Streaming?
How does Structured Streaming work?
What is a streaming query?
What is a trigger in Structured Streaming?
What is checkpointing in Spark Streaming?
What is watermarking in Structured Streaming?
What is event-time processing?
What is processing-time processing?
What is the difference between batch and streaming processing?
What is exactly-once processing in Spark?
How does Spark handle late-arriving data?
How does Spark integrate with Kafka?
How do you build a real-time Kafka-to-Spark pipeline?
How do you optimize Spark applications?
How do you tune Spark executor memory?
How do you tune Spark executor cores?
What is dynamic resource allocation in Spark?
What is the Spark UI?
How do you troubleshoot slow Spark jobs?
How do you diagnose out-of-memory errors in Spark?
How do you reduce shuffle operations in Spark?
How do you optimize PySpark applications?
What is Apache Arrow in PySpark?
How does PySpark communicate with the JVM?
What is a Pandas UDF in PySpark?
What is a Python UDF?
What is the difference between Python UDF and Pandas UDF?
How can Spark be used for machine learning?
What is Spark MLlib?
How can Spark process large AI training datasets?
How can Spark be integrated with MLflow?
How can Spark be used for feature engineering?
How can Spark support large-scale RAG pipelines?
How can Spark be used to process documents for RAG?
How can Spark generate datasets for LLM applications?
How can Spark be used for embedding generation pipelines?
How can Spark integrate with vector databases for AI applications?
How can Spark support large-scale Agentic AI data pipelines?
How can Spark process AI inference workloads at scale?
How would you design a production-grade Spark pipeline for AI and real-time analytics?

Related Topics


07 November 2020

#Spring_Cloud

#Spring_Cloud

Key Concepts


S.No Topic Sub-Topics
1 Introduction to Spring Cloud Why Spring Cloud?, Microservices Concepts, CAP Theorem, Cloud Native Architecture, Monolith vs MS
2 Spring Cloud Architecture Core Components, Service Discovery, Config Management, API Gateway, Circuit Breaker
3 Spring Cloud Dependencies Starters, BOM, Spring Cloud Versions, Compatibility Matrix, Maven/Gradle Setup
4 Spring Cloud Config Server Config Server Setup, Git Backend, application.yml, Encryption/Decryption, Refresh Scope
5 Spring Cloud Config Client Bootstrap Config, @RefreshScope, Bus Refresh, Secrets Management, Multiple Profiles
6 Eureka Service Discovery Eureka Server, Client Registration, Heartbeat, Instance Status, Self Preservation
7 Load Balancing with Eureka Client Side LB, Round Robin, Retry, Cache, Health Checks
8 API Gateway Concepts What is Gateway?, Filters, Routing, Global Filters, Path Rewrites
9 Spring Cloud Gateway Route Definitions, Predicates, Filters, CORS, Custom Filter
10 Feign Client Declarative REST, @FeignClient, Load Balancing, Error Decoders, Retry
11 Communication Patterns Sync vs Async, REST vs Messaging, Pub/Sub, gRPC Integration, Event Driven MS
12 Spring Cloud Bus Refresh Events, Kafka Backend, RabbitMQ Backend, Event Broadcasting, Config Sync
13 Circuit Breaker Concepts Fail Fast, Graceful Degradation, Bulkhead, Retry, Timeout
14 Resilience4j CircuitBreaker, Retry, TimeLimiter, Bulkhead, Dashboard
15 Spring Cloud Sleuth Tracing, Trace IDs, Span IDs, Correlation, Zipkin Integration
16 Distributed Logging & Zipkin Zipkin Setup, Collector, Query UI, Service Map, Correlation
17 Spring Cloud Security OAuth2, Keycloak Integration, JWT Propagation, Gateway Security, Token Exchange
18 Distributed Messaging Kafka, RabbitMQ, Topics, Partitions, Consumer Groups
19 Event Driven Microservices Events, CDC, Outbox Pattern, Sagas, Event Sourcing
20 Spring Cloud Stream Bindings, Channel, Functional Model, Kafka Streams, Error Handler
21 Data Management Database per MS, Shared DB Problems, CQRS, Read Replicas, Caching
22 Distributed Transactions 2PC, Saga Pattern, Compensation, Message Relay, Outbox Table
23 Cloud Observability Metrics, Micrometer, Grafana, Prometheus, Alerts
24 Testing Microservices Testcontainers, Contract Testing, Mock Server, Unit Test, Integration Testing
25 Docker & Spring Cloud docker-compose, Multi Service Network, Local Cloud, Volumes, Logs
26 CI/CD for Microservices Pipeline, GitHub Actions, Jenkins, Canary, Blue-Green
27 Kubernetes for Microservices Pods, Deployment, Services, Ingress, ConfigMap & Secrets
28 Helm for Deployment Charts, Values.yaml, Templating, Release Version, Rollback
29 Production Hardening Scaling, Caching Strategy, TLS, Zero Downtime, Canary Testing
30 Final Project Microservices Suite, Eureka, Config Server, Gateway, Resilience4j

Interview question

Basic Level

  1. What is Spring Cloud and why do we use it?
  2. Difference between Spring Boot and Spring Cloud.
  3. What is a microservice in Spring Cloud context?
  4. Explain service discovery in Spring Cloud.
  5. What is Eureka Server?
  6. What is Eureka Client?
  7. How does client-side load balancing work in Spring Cloud?
  8. What is Ribbon in Spring Cloud?
  9. Difference between Ribbon and LoadBalancerClient.
  10. What is Hystrix? Why is it used?
  11. Explain the Circuit Breaker pattern.
  12. What is Spring Cloud Config Server?
  13. How does centralized configuration help in microservices?
  14. What is Spring Cloud Bus?
  15. Explain the difference between Spring Cloud Gateway and Zuul.
  16. What is Feign Client in Spring Cloud?
  17. How do you enable Feign in a Spring Cloud project?
  18. What is a fallback method in Hystrix?
  19. Explain service registration and discovery flow.
  20. What is Spring Cloud Sleuth?
  21. What is Zipkin? How does it integrate with Spring Cloud?
  22. Difference between synchronous and asynchronous communication in microservices.
  23. What are profiles in Spring Cloud Config?
  24. How do you define routes in Spring Cloud Gateway?
  25. What is distributed tracing in Spring Cloud?

Intermediate Level

  1. How does Eureka handle service registration and deregistration?
  2. What is self-preservation mode in Eureka?
  3. Difference between Eureka, Zookeeper, and Consul.
  4. How to secure Spring Cloud Config Server?
  5. How to refresh properties dynamically in Spring Cloud Config?
  6. What is Spring Cloud Stream?
  7. What are binders in Spring Cloud Stream?
  8. What is the role of Spring Cloud Bus with Kafka/RabbitMQ?
  9. How does Spring Cloud Sleuth assign trace and span IDs?
  10. Explain distributed logging in Spring Cloud.
  11. What are retry mechanisms in Spring Cloud?
  12. How to implement API Gateway authentication and authorization?
  13. How does Spring Cloud Gateway handle rate limiting?
  14. What is service-to-service communication in Spring Cloud?
  15. How to use Feign Client for inter-service calls?
  16. What is load balancing in Feign Client?
  17. How to monitor microservices in Spring Cloud?
  18. Explain Hystrix dashboard and Turbine.
  19. How does Spring Cloud integrate with Kubernetes service discovery?
  20. What are config labels and branches in Spring Cloud Config?
  21. Explain Spring Cloud Contract for microservice testing.
  22. What are refresh scopes in Spring Cloud?
  23. How do you secure service-to-service communication?
  24. What is the role of Zuul filters?
  25. How does Spring Cloud Gateway support WebSockets?

Advanced Level

  1. How does Spring Cloud handle scalability in microservices?
  2. Explain the working of Resilience4j vs Hystrix.
  3. How do you implement bulkhead patterns in Spring Cloud?
  4. What is the difference between retry and circuit breaker?
  5. How do you secure communication with OAuth2 in Spring Cloud?
  6. How does Spring Cloud Config handle high availability?
  7. What is Spring Cloud Consul and how is it used?
  8. How do you implement blue-green deployment using Spring Cloud?
  9. What is canary release strategy in Spring Cloud?
  10. Explain distributed sessions with Spring Cloud.
  11. How to implement event-driven architecture using Spring Cloud Stream?
  12. What message brokers are supported by Spring Cloud Stream?
  13. How to achieve fault tolerance in Spring Cloud microservices?
  14. How to perform chaos testing in Spring Cloud applications?
  15. What is Spring Cloud Data Flow?
  16. Explain batch processing vs stream processing in Spring Cloud Data Flow.
  17. How do you configure multiple environments in Config Server?
  18. What is configuration encryption in Spring Cloud Config?
  19. How do you integrate Spring Cloud with Vault?
  20. How do you monitor circuit breakers at scale?
  21. Explain reactive microservices with Spring Cloud.
  22. How to achieve graceful degradation in Spring Cloud?
  23. What are challenges in scaling Eureka Server?
  24. How to design a resilient API Gateway?
  25. How to handle failover in distributed microservices?

Expert Level

  1. How do you design a large-scale system using Spring Cloud microservices?
  2. Explain CAP theorem in the context of Spring Cloud services.
  3. How does Spring Cloud achieve eventual consistency?
  4. How to migrate from a monolith to Spring Cloud microservices?
  5. How to implement multi-tenancy in Spring Cloud applications?
  6. How to integrate Spring Cloud with Istio (service mesh)?
  7. What is the Saga pattern? How do you implement it in Spring Cloud?
  8. Explain choreography vs orchestration in distributed transactions.
  9. How do you achieve zero-downtime deployment in Spring Cloud?
  10. What is API composition pattern in microservices?
  11. How to handle schema evolution in Spring Cloud microservices?
  12. Explain distributed caching in Spring Cloud.
  13. How do you integrate Spring Cloud with Kafka for event sourcing?
  14. How do you ensure observability with Micrometer + Prometheus + Grafana?
  15. How to build resilient CI/CD pipelines for Spring Cloud applications?
  16. How does Spring Cloud handle network partitions?
  17. How to design a fault-tolerant ecosystem with Spring Cloud?
  18. What is polyglot persistence in microservices? How to manage it with Spring Cloud?
  19. How do you implement advanced security (mTLS) in Spring Cloud?
  20. How do you handle cross-cutting concerns (logging, tracing, metrics)?
  21. What are best practices for managing secrets in Spring Cloud?
  22. How do you perform chaos engineering in Spring Cloud?
  23. Explain the role of Spring Cloud in hybrid cloud deployments.
  24. How does Spring Cloud integrate with AWS/GCP/Azure?
  25. How do you combine Spring Cloud with Domain-Driven Design (DDD)?

Related Topics


   Config_Mgmt   
   Service Discovery   
   Load Balancing   
   API Gateway   
   Circuit Breaker   
   Service Mesh   
   Distributed Tracing   

#Spring_MVC

#Spring_MVC

Key Concepts


S.No Topic Sub-Topics
1Introduction to MVCMVC Pattern, Model View Controller, DispatcherServlet, Front Controller, Request Flow
2Spring MVC ArchitectureDispatcherServlet, HandlerMapping, Controller, ViewResolver, HandlerAdapter
3Spring MVC SetupMaven Dependencies, web.xml Config, Spring Boot Setup, @SpringBootApplication, Application Properties
4DispatcherServletInitialization, URL Mapping, Request Processing, Handler Resolution, Response Rendering
5Controllers@Controller, @RestController, Handler Methods, RequestMapping, ResponseBody
6Request Mapping@RequestMapping, @GetMapping, @PostMapping, Path Variables, Query Params
7Data BindingBindingResult, @ModelAttribute, Form Data Binding, Conversion Service, Validation
8ViewsJSP, Thymeleaf, FreeMarker, Velocity, Html Templates
9View ResolverInternalResourceViewResolver, ThymeleafViewResolver, Suffix Prefix Config, Content Negotiation, JSP Rendering
10ModelModel Object, ModelMap, ModelAndView, Attributes, Session Attributes
11Form HandlingHTML Forms, POST Request, Form Validation, Form Submission, Binding
12Validation@Valid, JSR303, Custom Validators, BindingResult, Error Display
13Exception Handling@ExceptionHandler, @ControllerAdvice, Global Error Handling, Error Pages, Custom Responses
14InterceptorsHandlerInterceptor, preHandle, postHandle, afterCompletion, Cross-Cutting Logic
15FiltersServlet Filters, FilterChain, Authentication Filters, Logging Filters, CORS Filters
16REST API Development@RestController, JSON Response, HttpStatus, RequestBody, ResponseEntity
17RequestBody and ResponseBodyPayload Binding, Jackson, MessageConverters, JSON Mapping, XML Mapping
18Session ManagementSession Attributes, Cookies, HttpSession, Token Storage, Timeout
19File UploadMultipartFile, Upload Config, Storage Service, File Validation, Error Handling
20Security IntegrationSpring Security, Login Form, Session Auth, CSRF Protection, Authorization
21InternationalizationResourceBundle, LocaleResolver, MessageSource, Language Switch, UI Translations
22LoggingSLF4J, Logback, Request Logging, Log Format, Debugging
23Testing Spring MVCMockMVC, Controller Test, Slice Test, Response Validation, RestTemplate Test
24Database IntegrationSpring Data JPA, Repositories, Entity Mapping, Transaction, CRUD
25Pagination and SortingPageRequest, Pageable, PageableHandlerMethodArgumentResolver, Sorting Parameter, REST Pagination
26Thymeleaf Deep DiveTemplate Expressions, Iterations, Layouts, Fragments, Form Binding
27Async MVCCallable, DeferredResult, WebAsyncTask, Async Request Handling, Thread Pool
28CachingSpring Cache, Cacheable, CacheEvict, CacheManager, EhCache
29API DocumentationSwagger, OpenAPI, UI Config, API Validation, Schema Generation
30Interview PreparationArchitecture Questions, Coding Tasks, Common Patterns, Debugging Skills, Best Practices

Interview question

Basic

  1. What is Spring MVC?
  2. Explain the MVC architecture.
  3. What is DispatcherServlet?
  4. What is the role of HandlerMapping in Spring MVC?
  5. Explain Front Controller design pattern.
  6. What is @Controller annotation?
  7. What is @RestController annotation?
  8. What is @RequestMapping used for?
  9. Difference between @GetMapping and @PostMapping.
  10. How do you use @PathVariable in a controller?
  11. How do you use @RequestParam in a controller?
  12. How do you use @RequestHeader?
  13. What is a Model in Spring MVC?
  14. How do you use @ModelAttribute?
  15. What is the purpose of @InitBinder?
  16. Explain the role of ViewResolver.
  17. What is InternalResourceViewResolver?
  18. How do you return a JSP view from a controller?
  19. How do you return a Thymeleaf view?
  20. How do you pass data from Controller to View?
  21. What is BindingResult used for?
  22. What is @Valid annotation?
  23. What is HttpSession in Spring MVC?
  24. What is a FlashAttribute?
  25. How do you handle form submissions in Spring MVC?

Intermediate

  1. Explain validation in Spring MVC.
  2. Difference between global and local validation.
  3. What is HandlerInterceptor?
  4. What is WebRequestInterceptor?
  5. How do you handle exceptions in Spring MVC?
  6. What is @ExceptionHandler?
  7. What is @ControllerAdvice?
  8. What is ResponseStatusException?
  9. Explain JSON response using @ResponseBody.
  10. What is MessageConverter?
  11. What is Content Negotiation?
  12. Explain versioning strategies for REST APIs.
  13. How do you implement HATEOAS in Spring MVC?
  14. How do you upload files in Spring MVC?
  15. What is MultipartFile?
  16. What is CommonsMultipartResolver?
  17. How do you handle session attributes using @SessionAttributes?
  18. Explain cookies handling in Spring MVC.
  19. How do you implement internationalization (i18n)?
  20. What is MessageSource?
  21. What is LocaleResolver?
  22. What is LocaleChangeInterceptor?
  23. How do you use DeferredResult for async processing?
  24. How do you use Callable for async processing?
  25. What is @Async in Spring MVC?

Advanced

  1. Difference between synchronous and asynchronous controllers.
  2. How do you configure a Filter in Spring MVC?
  3. How do you implement a custom HandlerInterceptor?
  4. How do you implement a custom ViewResolver?
  5. How do you implement a custom MessageConverter?
  6. How do you secure Spring MVC applications using Spring Security?
  7. What is CSRF and how is it handled in Spring MVC?
  8. How do you implement authentication in Spring MVC?
  9. How do you implement authorization in Spring MVC?
  10. How do you implement role-based access control?
  11. How do you test controllers using MockMvc?
  12. How do you test a Spring MVC application with @WebMvcTest?
  13. How do you handle exceptions globally with @ControllerAdvice?
  14. How do you handle validation errors in REST APIs?
  15. How do you implement RESTful services in Spring MVC?
  16. How do you handle JSON and XML requests/responses?
  17. How do you implement cross-origin requests (CORS)?
  18. How do you implement caching in Spring MVC?
  19. How do you implement ETag for resources?
  20. How do you optimize resource handling in Spring MVC?
  21. How do you implement content compression in Spring MVC?
  22. How do you implement conditional GET requests?
  23. How do you integrate Spring MVC with Thymeleaf templates?
  24. How do you implement dynamic view resolution?
  25. How do you handle large file uploads efficiently?

Expert

  1. How do you implement distributed session management?
  2. How do you implement asynchronous REST API calls?
  3. How do you implement streaming large responses?
  4. How do you handle backpressure in async requests?
  5. How do you debug complex Spring MVC request mappings?
  6. How do you optimize memory usage in controllers?
  7. How do you implement advanced exception handling strategies?
  8. How do you implement rate limiting in Spring MVC?
  9. How do you implement throttling for APIs?
  10. How do you integrate Spring MVC with WebSockets?
  11. How do you implement server-sent events (SSE)?
  12. How do you implement dynamic content negotiation?
  13. How do you implement versioned APIs with media types?
  14. How do you implement advanced security with OAuth2/JWT?
  15. How do you integrate Spring MVC with reactive programming (Spring WebFlux)?
  16. How do you handle cross-service communication in microservices?
  17. How do you monitor Spring MVC applications in production?
  18. How do you implement custom interceptors for logging and metrics?
  19. How do you implement advanced testing strategies for controllers?
  20. How do you implement dynamic handler mapping?
  21. How do you implement high-performance REST endpoints?
  22. How do you migrate legacy Spring MVC applications to Spring Boot?
  23. How do you implement API gateways with Spring MVC microservices?
  24. How do you implement advanced exception mapping for REST APIs?
  25. What are best practices for enterprise-grade Spring MVC applications?

Related Topics


#Maven

#Maven

Key Concepts


S.No Topic Sub-Topics
1 Introduction to Maven What is Maven, History and evolution, Maven vs Ant vs Gradle, Maven lifecycle overview, Maven installation
2 Maven Project Structure Standard directory layout, src/main/java, src/test/java, src/main/resources, src/test/resources, target folder explanation
3 POM (Project Object Model) What is POM, pom.xml structure, Project coordinates, Dependencies section, Plugins section
4 Dependencies in Maven Adding dependencies, Scope of dependencies (compile, test, etc.), Transitive dependencies, Excluding dependencies, Dependency versioning
5 Maven Repositories Local repository, Central repository, Remote repositories, Repository layout, Repository settings in settings.xml
6 Maven Build Lifecycle Phases overview, Default lifecycle, Clean lifecycle, Site lifecycle, How phases are executed
7 Maven Plugins What are plugins, Common plugins (compiler, surefire), Plugin goals, Configuring plugins, Plugin execution
8 Maven Goals What is a goal, Difference between goal and phase, Common goals, Running goals from CLI, Custom goals
9 Maven Archetypes What is an archetype, Default Maven archetypes, Creating a project using archetype, Custom archetypes, Listing available archetypes
10 Maven Properties Defining properties, Using properties in POM, System properties, Environment variables, Property inheritance
11 Maven Profiles What are profiles, Profile activation, Defining multiple profiles, Using profiles for environments, Profile inheritance
12 Maven Parent and Child Projects Multi-module projects, Parent POM, Child POM, Inheritance of dependencies, Module aggregation
13 Maven Dependency Management Dependency management section, Centralized version management, Importing BOMs, Overriding versions, Best practices
14 Maven Build Profiles Build configuration per environment, Active profiles, CLI profile activation, Conditional builds, Combining multiple profiles
15 Maven Repositories Advanced Repository mirrors, Repository policies, Deploying artifacts, Snapshot vs Release, Repository management tools
16 Maven Dependency Resolution Dependency tree, Conflicts and exclusions, Dependency plugin, Dependency convergence, Troubleshooting dependency issues
17 Maven Build Lifecycle Deep Dive Validate phase, Compile phase, Test phase, Package phase, Install and deploy phases
18 Maven Plugin Development Writing custom plugins, Mojo interface, Plugin packaging, Plugin parameters, Deploying plugins
19 Maven Site & Reporting Maven site plugin, Reporting plugins, Generating project site, Customizing site, Linking multiple reports
20 Maven Integration with IDEs Eclipse integration, IntelliJ IDEA integration, Importing Maven projects, Running Maven goals from IDE, Updating dependencies in IDE
21 Maven Continuous Integration Maven in Jenkins, Maven in GitLab CI/CD, Automating builds, Integration tests, Reporting test results
22 Maven with Git Version control of POM, Ignoring target folder, Tagging releases, Branch management, CI/CD integration
23 Maven Best Practices Standard project layout, Dependency version management, Plugin versioning, Avoiding SNAPSHOTs in production, Consistent build lifecycle usage
24 Maven Troubleshooting Debug mode (-X), Resolving dependency conflicts, Missing artifacts, Plugin execution errors, Clean builds
25 Maven Advanced Techniques Custom lifecycles, Custom plugins, Advanced profiles, Multi-module optimization, Build extensions
26 Maven and Spring Integration Spring Boot starter dependencies, Maven plugin for Spring Boot, Building executable JARs, Dependency management with Spring Boot, Multi-module Spring projects
27 Maven Security Securing repositories, Signing artifacts, Handling credentials, Using encrypted passwords, Dependency vulnerability checks
28 Maven Performance Optimization Parallel builds, Build caching, Reducing dependency downloads, Avoiding SNAPSHOT updates, Profile-based optimization
29 Maven Case Studies Real-world multi-module project, Dependency management strategies, CI/CD pipeline with Maven, Build failures and resolutions, Project migration to Maven
30 Maven Certification & Resources Official Maven documentation, Tutorials and blogs, Online courses, Community forums, Preparing for Maven certification

Interview question

Basic

  1. What is Maven and why is it used?
  2. Difference between Maven and Ant?
  3. What is the role of the pom.xml file?
  4. What is a Maven build lifecycle?
  5. What are the default build lifecycles in Maven?
  6. What is the difference between install and deploy phases?
  7. How do you run a Maven build?
  8. What is the difference between mvn clean and mvn package?
  9. How do you check Maven version?
  10. What is the default directory structure of a Maven project?
  11. What are Maven goals?
  12. What is the difference between validate and verify phases?
  13. What is the role of the target folder?
  14. How do you create a Maven project from command line?
  15. What is the use of mvn archetype:generate?
  16. How do you define project dependencies in Maven?
  17. What is the Maven repository?
  18. Difference between local, central, and remote repositories?
  19. What is the role of .m2 folder?
  20. What is a Maven snapshot?
  21. Difference between SNAPSHOT and release version?
  22. How do you skip tests in Maven build?
  23. What is the purpose of Maven compiler plugin?
  24. What is the role of settings.xml file in Maven?
  25. How do you run only specific tests in Maven?

Intermediate

  1. What is the difference between mvn install and mvn deploy?
  2. Explain Maven dependency management.
  3. What are transitive dependencies in Maven?
  4. How do you exclude a transitive dependency?
  5. What are dependency scopes in Maven?
  6. Difference between compile, provided, runtime, test, and system scopes?
  7. How do you resolve version conflicts in dependencies?
  8. What is a Maven archetype?
  9. How do you configure a plugin in Maven?
  10. What is the use of Maven Surefire plugin?
  11. How do you build a JAR file using Maven?
  12. How do you build a WAR file using Maven?
  13. What is the Maven Assembly plugin?
  14. What is the Maven Shade plugin?
  15. Difference between Maven Assembly and Shade plugin?
  16. What is the Maven Dependency plugin?
  17. What are profiles in Maven?
  18. How do you activate Maven profiles?
  19. How do you configure different environments in Maven?
  20. How do you skip a plugin execution in Maven?
  21. What is Maven release plugin?
  22. How do you handle multi-module projects in Maven?
  23. What is the parent POM in Maven?
  24. What is inheritance in Maven POMs?
  25. Difference between dependency management and dependencies section?

Advanced

  1. How do you create custom Maven plugins?
  2. Explain the internal architecture of Maven.
  3. How does Maven resolve dependencies internally?
  4. What is a BOM (Bill of Materials) in Maven?
  5. How do you use BOM for dependency management?
  6. What is the difference between import scope and compile scope?
  7. How do you enforce dependency convergence?
  8. Explain how Maven integrates with CI/CD pipelines.
  9. How do you integrate Maven with Jenkins?
  10. How do you integrate Maven with GitHub Actions or GitLab CI?
  11. How do you deploy Maven artifacts to Nexus or Artifactory?
  12. What is the difference between mvn site and mvn install?
  13. What is the use of Maven Site plugin?
  14. How do you generate project reports in Maven?
  15. How do you configure code coverage tools (JaCoCo) with Maven?
  16. How do you configure static analysis tools (Checkstyle, PMD, SpotBugs) with Maven?
  17. What are build extensions in Maven?
  18. How do you implement reproducible builds in Maven?
  19. How do you configure incremental builds in Maven?
  20. What is the difference between Maven wrapper (mvnw) and Maven installation?
  21. How do you handle circular dependencies in Maven?
  22. How do you override plugin versions in Maven?
  23. Explain dependency mediation in Maven.
  24. How do you configure parallel builds in Maven?
  25. What are some best practices in managing dependencies in Maven?

Expert

  1. How does Maven differ from Gradle?
  2. Explain the internals of the Maven build lifecycle phases.
  3. How do you implement enterprise-level dependency management in Maven?
  4. Explain Maven's interaction with Ivy and Ant.
  5. How do you design a corporate Maven repository strategy?
  6. How do you secure Maven repositories?
  7. What are repository mirrors in Maven?
  8. How do you configure mirrors in settings.xml?
  9. How do you configure authentication for private Maven repositories?
  10. What are wagon providers in Maven?
  11. How do you configure HTTPS for Maven repositories?
  12. How do you use GPG signing with Maven?
  13. Explain the lifecycle of Maven plugin execution.
  14. How do you debug Maven builds?
  15. How do you use Maven with Dockerized builds?
  16. How do you configure caching strategies for Maven builds in CI/CD?
  17. Explain Maven Reactor and its role in multi-module builds.
  18. How do you configure dependency substitution in Maven?
  19. How do you use Maven Toolchains?
  20. Explain polyglot Maven (YAML, Groovy POMs).
  21. How do you optimize Maven for large-scale enterprise builds?
  22. How does Maven interact with containerized microservices builds?
  23. How do you automate artifact promotion from snapshot to release in Maven?
  24. How do you implement versioning strategies with Maven in monorepos?
  25. Future trends: What is the role of Maven in the era of Gradle and Bazel?

Related Topics