Write-Ahead Log (WAL) - CI/CD Glossary Definition
A write-ahead log records every change before it is applied to the data files, so a crashed database can replay the log to recover committed transactions. It also drives replication and point-in-time restore.
Why it matters
The WAL is what makes the Durability in ACID possible, and shipping it to replicas is how many databases (Postgres, MySQL binlog) keep copies in sync.
Related guides
Replication - CI/CD Glossary DefinitionReplication: Replication copies data from a primary database to one or more replicas, providing redundancy fo…
ACID - CI/CD Glossary DefinitionACID: ACID is the set of guarantees a transactional database provides: Atomicity (all-or-nothing), Consistenc…
Database Snapshot - CI/CD Glossary DefinitionDatabase Snapshot: A database snapshot is a point-in-time copy of a database (a dump or a storage-level clone…