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Is there a point in time recovery in PostgreSQL?
In a previous post, we discussed Postgres backups in general. In this blog post, we’ll look at how to do point-in-time recovery for PostgreSQL. Point-in-time recovery (PITR) is a pretty useful feature. You need to keep in mind that the backup is a “snapshot” of your dataset at a given point of time.
How is point in time recovery ( PITR ) useful?
Point-in-time recovery (PITR) is a pretty useful feature. You need to keep in mind that the backup is a “snapshot” of your dataset at a given point of time. If you take backups on a daily basis, in the worst case scenario, you will have almost 24 hours of data that is not in more than you had in your last backup.
How to restore PostgreSQL database after an incident?
Let’s see how the whole process of backing up data and restoring it after an incident may look like on PostgreSQL 10.1 (which you can deploy using ClusterControl ). PostgreSQL stores all modifications in form of Write-Ahead Logs (WAL). These files can be used for replication, but they can also be used for PITR.
When to stop replay in PostgreSQL base backup?
We could stop the replay at any point and have a consistent snapshot of the database as it was at that time. Thus, this technique supports point-in-time recovery: it is possible to restore the database to its state at any time since your base backup was taken.
How to restore PostgreSQL database from a backup?
First, you should stop the PostgreSQL server: ? Then you need to remove all of the data directory, restore the base backup and then remove any existing WAL files. PostgreSQL will copy the data from our WAL archive directory. ? Now, it’s time to prepare the recovery.conf file, which will define how the recovery process will look like.
Where is the recovery.conf file in PostgreSQL?
To do this, we have to create a file called “recovery.conf” in the restored cluster data directory and start up a Postgres server for that data directory. The recovery.conf file contains the target timestamp, and looks like this: The restore_command specifies how to fetch a WAL file required by PostgreSQL. It is the inverse of archive_command.
How to perform a point in time restore in SQL Server?
SQL Server allows you to perform the point in time restore by using either T-SQL or SSMS. To be able to perform a point in time restore you need to restore the full back up which ended prior to the point you would like to restore to, and then restore all the log backups including the one which contains the point you want to get to.