PITR in postgresql

--https://share.google/aimode/3HeQpqCzGd5j6MsOo

Point-in-Time Recovery (PITR) in PostgreSQL lets you restore a database to a precise moment in the past. It combines a physical base backup (snapshot) with continuous Write-Ahead Log (WAL) archiving. During recovery, PostgreSQL replays the WAL transactions up to your chosen target time. [1, 2, 3, 4, 5]

Core Components

Base Backup: A full physical snapshot of your data cluster directory taken via tools like pg_basebackup, pgBackRest, or Barman.
WAL Archiving: Continuous copying of transaction log files (pg_wal) to a secure, separate storage location as changes occur.
Recovery Target: Setting a specific timestamp, transaction ID, or LSN in your recovery configuration to stop the replay right before an error or data loss event. [1, 2, 3, 4, 5]

Basic Recovery Steps

Stop the PostgreSQL server process.
Clear or backup the existing corrupted/current data directory.
Restore your latest base backup files into the cluster data directory.
Configure recovery parameters (like restore_command and recovery_target_time).
Create a recovery.signal file inside the data directory (PostgreSQL 12+).
Start the server to initiate automatic WAL replay up to the target point. [1, 2, 3, 4]

For managed cloud databases, such as Cloud SQL for PostgreSQL, PITR is typically managed via automated console options to clone or roll back instances directly. [1]

Watch this tutorial to see how physical backups and WAL replay work during a PostgreSQL recovery procedure:

52s

PostgreSQL 18 PITR Tutorial | Point in Time Recovery and ...

1.1ஆ பார்வைகள் · 10 மாதங்களுக்கு முன்

YouTube · Chirag Mahto

If you'd like to proceed, tell me:

• Are you using native tools (pg_basebackup) or a manager like pgBackRest / Barman?
• Do you need help writing the restore_command or setting a recovery_target_time?