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Historical version. PostgreSQL 9.5 has reached end of support. 2021-02-11. See the current manual.

Chapter 29. Reliability and the Write-Ahead Log

Table of Contents
29.1. Reliability
29.2. Write-Ahead Logging (WAL)
29.3. Asynchronous Commit
29.4. WAL Configuration
29.5. WAL Internals

This chapter explains how the Write-Ahead Log is used to obtain efficient, reliable operation.

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Read the upstream documentation. For corrections, first check the current manual.