pg_database

The pg_database system catalog table stores information about the available databases. Databases are created with the CREATE DATABASE SQL command. Unlike most system catalogs, pg_database is shared across all databases in the system. There is only one copy of pg_database per system, not one per database.

columntypereferencesdescription
datnamename Database name.
datdbaoidpg_authid.oidOwner of the database, usually the user who created it.
encodingint4 Character encoding for this database. pg_encoding_to_char() can translate this number to the encoding name.
datistemplateboolean If true then this database can be used in the TEMPLATE clause of CREATE DATABASE to create a new database as a clone of this one.
datallowconnboolean If false then no one can connect to this database. This is used to protect the template0 database from being altered.
datconnlimitint4 Sets the maximum number of concurrent connections that can be made to this database. -1 means no limit.
datlastsysoidoid Last system OID in the database.
datfrozenxidxid All transaction IDs before this one have been replaced with a permanent (frozen) transaction ID in this database. This is used to track whether the database needs to be vacuumed in order to prevent transaction ID wraparound or to allow pg_clog to be shrunk. It is the minimum of the per-table pg_class.relfrozenxid values.
dattablespaceoidpg_tablespace.oidThe default tablespace for the database. Within this database, all tables for which pg_class.reltablespace is zero will be stored in this tablespace. All non-shared system catalogs will also be there.
datconfigtext[] Session defaults for user-settable server configuration parameters.
dataclaclitem[] Database access privileges as given by GRANT and REVOKE.

Parent topic: System Catalogs Definitions