This way if the database crashes in the middle of an operation, upon restart, the server will be able to look at the WAL file and tell if the operation was successful or not and restore the database to a usable state.
How far back in time does stellar data recovery recover data update#
Basically every modification, insert, update and delete are written into a log *before* they are actually applied. To understand PITR, we must first understand what is WAL, the replication and backup will be based on WAL files, so it’s important to understand what it is. It also does not allow to fine tune the backup on a per database basis, the backup happens for the whole cluster and so is the recovery.Ĭontinuous Archiving and Point-in-Time Recovery This is obviously a better solution than pg_dump but requires much more knowledge of PostgreSQL and more configuration.
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If you backup using a cronjob every night at 4:00 AM, and an accident happen at 4:00 PM the same day, you would have lost 12 hours of data. It also would not allow you to perform a fine grained backup and you will not be able to recover data that happened *after the backup*. Backup using pg_dump or pgdump_all: this solution is the most simple of all but doesn’t perform well for large database.There are several methods for backing a PostgreSQL database up. Create a hot standby database server that is ready for use in case your main PostgreSQL server fails, using repmgr.įor the purpose of this article, I will assume you have PostgreSQL 10 or higher installed, and basic knowledge of PostgreSQL configuration.
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In this article I will introduce you with a solution for: