pg_controldata 1 Application pg_controldata display control information of a PostgreSQL database cluster pg_controldata pg_controldata datadir pg_controldata prints information initialized during initdb, such as the catalog version. It also shows information about write-ahead logging and checkpoint processing. This information is cluster-wide, and not specific to any one database. This utility can only be run by the user who initialized the cluster because it requires read access to the data directory. You can specify the data directory on the command line, or use the environment variable PGDATA. PGDATA Default data directory location