What is QLDB? Amazon QLDB is a fully managed ledger database that provides a transparent, immutable, and cryptographically verifiable transaction log owned by a central trusted authority.
QLDB is called ‘Quantum’ as in indivisible discrete changes. All the transactions are recorded to a transparent journal where each block represents a discrete state change.
Overview QLDB is considered a ledger database. A ledger consists of one or more QLDB tables, and a journal, as shown below: