AWS-QLDB

• Quantum Ledger Database is a purpose-built ledger database that provides a complete and cryptographically verifiable history of all changes made to application data.

• Data in Amazon QLDB is written to an append-only journal, providing the developer with full data lineage.

• Data in Amazon QLDB's journal is immutable and verifiable, meaning users can trust the data in their ledger.

• It is not a blockchain or distributed ledger technology.

• It supports transactions with ACID semantics, a flexible document data model & a familiar SQL-like API.

• It is fully managed and automatically scales to meet the needs of user's application with no provisioning required.

• To connect to QLDB and transact with the data in the ledger, users need to use the AWS-provided QLDB driver.

• It can execute 2-3X as many transactions than ledgers in common blockchain frameworks.

• It has a centralized design, allowing its transactions to execute without the need for multi-party consensus.

• It allows to access and manipulate data using PartiQL, which is a new open standard query language.

• It 's ledger is deployed across multiple AZs with multiple copies per AZ.

• It is strongly durable.

• It does not support cross-region replication.

• It is integrated with AWS Private Link.

• It uses AWS-owned keys to encrypt customer data. By default, all data in transit and at rest is encrypted.

• It Streaming capability provide at-least-once delivery guarantee.

• It provides CloudWatch metrics for ledgers.

• It stores data using a document-oriented data model, which provides users the flexibility to store structured and semi-structured data.

• QLDB’s data model supports nested data structures.

• It transactions have full serializability - the highest level of isolation.

• It backs up data continuously while maintaining consistent performance, allowing it to transparently recover from any instance or physical storage failures.

• It uses a cryptographic hash function (SHA-256) to generate a secure output file of user data’s change history, known as a digest.

• Manufacturers can use QLDB to easily trace the history of the entire production and distribution lifecycle of a product.

• With QLDB, retail companies can look back and track the full history of inventory and supply chain transactions at every logistical stage of their products.

• With QLDB, customers can easily maintain a trusted and complete record of the digital history of their employees, in a single place.