software
WAL
Write-Ahead Log
Definition
A WAL is a durability mechanism where database changes are written to a sequential log before being applied to data files. On crash recovery, the database replays unfinished WAL entries to restore a consistent state.
WAL also enables streaming replication and CDC by allowing replicas and consumers to read the change stream. PostgreSQL's WAL is the foundation of its replication and logical decoding capabilities.
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