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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.
|datdba||oid||pg_authid.oid||Owner of the database, usually the user who created it.|
|encoding||int4||Character encoding for this database. pg_encoding_to_char() can translate this number to the encoding name.|
|datcollate||name||LC_COLLATE for this database.|
|datctype||name||LC_CTYPE for this database.|
|datistemplate||boolean||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.|
|datallowconn||boolean||If false then no one can connect to this database. This is used to protect the template0 database from being altered.|
|datconnlimit||int4||Sets the maximum number of concurrent connections that can be made to this database. -1 means no limit.|
|datlastsysoid||oid||Last system OID in the database.|
|datfrozenxid||xid||All transaction IDs (XIDs) 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.|
|datminmxid||xid||A Multixact ID is used to support row locking by multiple transactions. All multixact IDs before this one have been replaced with a transaction ID in this database. This is used to track whether the database needs to be vacuumed in order to prevent multixact ID wraparound or to allow pg_multixact to be shrunk. It is the minimum of the per-table pg_class.relminmxid values.|
|dattablespace||oid||pg_tablespace.oid||The 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.|
|datacl||aclitem||Database access privileges as given by GRANT and REVOKE.|