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Amazon Qldb

Amazon QLDB is a fully managed ledger database service for building applications that require an authoritative data source. It uses an immutable transactional log, or journal, to automatically record changes to application data with a full history that can be traced back to its original entry. This lets users maintain the integrity of their data over time without the need for complex read-after-write verifications. Amazon Quantum Ledger Database (QLDB) is serverless and scales with usage so it can handle high-throughput workloads and large volumes of transactions across multiple tables and indices.