February 2020
Intermediate to advanced
734 pages
38h 13m
English
Content preview from PostgreSQL 12 High Availability Cookbook - Third Edition
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Securing the WAL stream
The primary mechanism that PostgreSQL uses to provide a data durability guarantee is through its Write-Ahead Log (WAL). All transactional data is written to this location before ever being committed to database files. Once WAL files are no longer necessary for crash recovery, PostgreSQL will either delete or archive them. For a highly available server, we recommend that you keep these important files as long as possible. There are several reasons for this:
- Archived WAL files can be used for Point-In-Time Recovery (PITR).
- If you are using streaming replication, interrupted streams can be re-established by applying WAL files until the replica has caught up.
- WAL files can be reused to service multiple server copies. ...
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