Category: Blockchain
Service: Amazon Quantum Ledger Database (QLDB)
Answer:
An Amazon QLDB ledger is made up of several components that work together to manage and validate transactions. These components include:
Journal: The journal is the immutable history of all the changes to the ledger. It is stored on multiple nodes within the QLDB cluster for durability and availability. All transactions are first recorded in the journal before they are committed to the ledger.
Indexes: QLDB supports secondary indexes that can be used to improve query performance. Indexes are built automatically based on the attributes specified in the query.
Tables: Tables in QLDB are similar to tables in a relational database. They consist of a set of columns that define the data stored in the table, and a set of indexes that enable efficient querying of the table.
Partitions: QLDB partitions data into multiple partitions to improve scalability and performance. Each partition is replicated across multiple nodes in the QLDB cluster for durability and availability.
API: QLDB provides a set of APIs that allow developers to interact with the ledger programmatically. The APIs support transaction processing, data querying, and ledger management operations.
Driver: QLDB provides drivers for popular programming languages like Java, Python, and .NET to simplify application development.
All these components work together to provide a highly durable, highly available, and highly scalable ledger service for applications.
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