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Where is Postgres data stored?
All the data needed for a database cluster is stored within the cluster’s data directory, commonly referred to as PGDATA (after the name of the environment variable that can be used to define it). A common location for PGDATA is /var/lib/pgsql/data.
Where is the PostgreSQL data directory?
A common location for PGDATA is /var/lib/pgsql/data. Multiple clusters, managed by different server instances, can exist on the same machine. The PGDATA directory contains several subdirectories and control files, as shown in Table 54-1. In addition to these required items, the cluster configuration files postgresql.
How is data stored in Postgres?
When data is stored in Postgres, Postgres in turn stores that data in regular files in the filesystem. All of the files are stored in /var/lib/postgresql/9.5/main/base/16387/. The first GB of the table is stored in a file called 51330, the second in a file called 51330.1, the third in 51330.2, and so on.
When to upgrade PostgreSQL from version 9.5 to 12.4?
PostgreSQL version 9.5 has been placed under End-of-Life status as of 11 February 2021. Hence, use of version 12.4 is mandatory starting Monday 5 July 2021. We encourage customers to plan their upgrade of the database to version 12.4 before this date. Additionally, you can upgrade to version 12.6 to take advantage of security fixes.
Is it safe to rename the Postgres installation directory?
Once the current PostgreSQL server is shut down, it is safe to rename the PostgreSQL installation directory; assuming the old directory is /usr/local/pgsql, you can do: to rename the directory.
Is there a way to upgrade a PostgreSQL cluster?
One upgrade method is to dump data from one major version of PostgreSQL and reload it in another — to do this, you must use a logical backup tool like pg_dumpall; file system level backup methods will not work.
How to upgrade a standby server in PostgreSQL?
If you are upgrading standby servers using methods outlined in section Step 10, verify that the old standby servers are caught up by running pg_controldata against the old primary and standby clusters. Verify that the “Latest checkpoint location” values match in all clusters.