Package: postgresql-9.5-pg-checksums Source: pg-checksums Version: 1.0-6.pgdg20.04+1 Architecture: amd64 Maintainer: Debian PostgreSQL Maintainers Installed-Size: 70 Depends: libc6 (>= 2.4), postgresql-9.5 Recommends: pg-checksums-doc Homepage: https://github.com/credativ/pg_checksums Priority: optional Section: database Filename: pool/main/p/pg-checksums/postgresql-9.5-pg-checksums_1.0-6.pgdg20.04+1_amd64.deb Size: 28808 SHA256: d517156fa3c06a7b065826e0ecc6bc0348acfb81cb4daf55107503d01a8ead2e SHA1: a58261cc9586e8c0553411b708c43bf4f54c985d MD5sum: e5e71e1408aef201866fc0af1308ca11 Description: Activate/deactivate/verify PostgreSQL data checksums Data checksums allow the PostgreSQL database server to identify I/O failures when reading data from storage. The checksums stored in the page header of each data page are compared to the computed checksum of the read data. . Data checksums need to be activated at instance creation time, all current versions of PostgreSQL including v11 do not allow activating (or deactivating) checksums afterwards. . pg_checksums can activate or deactivate data checksums as long at the database cluster is shutdown cleanly. Activating checksums requires all database blocks to be read and all page headers to be updated, so can take a long time on a large database. Deactivating checksums only requires the cluster control file to be updated so is quick. . In addition, pg_checksums can verify the checksums in an offline cluster.