17 December 2015
(First in a series of things I always do when setting up or configuring PostgreSQL.)
Since version 9.3, PostgreSQL has had the option to create new database clusters with data checksums. These are fast, simple checksums to verify that the data coming off of disk is what PostgreSQL expects it to be. The checksums don’t correct errors, but it can be a warning that something bad has happened to your data.
Always initialize new clusters with them turned on, unless you are running on a file system (like ZFS) that does checksumming itself. You have uncorrected errors on your disk, so you might as well find them.
Turning them on is the –data-checksums (-k) option to initdb. If you are using Debian packaging, you can set this in the