This process is calledД¬heckpointing, and happens in the background automatically (it can also beДЇorced manually). To the on-disk representation of the data itself. The WAL file mechanism is essential to the working of PostgreSQL, andДЄfter the changes are first written out as WAL records, they have to be applied

They keep getting generated for as long as modifications happen to theД¬luster. WAL files are generated incrementally, in sequence, starting from clusterД¬reation. On a default Debian installation for example, the WAL fileДirectory for the main cluster is /var/lib/postgresql/10/main/pg_wal. WAL files live in $PGDATA/pg_wal, where $PGDATA is the data directory for These records are written into fixed-length filesД¬alled WAL segment files, or simply WAL files. Modifications made to the data by transactions are recorded as an ordered Single PostgreSQL server process is possible only via transactions. Systems to provide durable and atomic transactions.Д¬hanges to the data contained in a PostgreSQL database cluster managed by a Read on to learn more about the settings and procedures PostgreSQL comes with the ability to do incremental backups and point-in-time

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