Write-Ahead Log - CI/CD Glossary Definition
A write-ahead log records changes to disk before applying them, so committed data survives a crash and can be replayed.
A write-ahead log (WAL) records changes to durable storage before applying them to the database, so committed data survives a crash and can be replayed.
The WAL underpins replication and point-in-time recovery; both are relevant when a migration goes wrong and you need to restore to a moment before it ran.
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