PG_DATABASE

PG_DATABASE records information about the available databases.

**Table 1** PG_DATABASE columns
Name	Type	Description
datname	name	Database name
datdba	oid	Owner of the database, usually the user who created it
encoding	integer	Database encoding. You can use pg_encoding_to_char() to convert this number to the encoding name.
datcollate	name	Sequence used by the database
datctype	name	Character type used by the database
datistemplate	boolean	Whether this column can serve as a template database
datallowconn	boolean	If false then no one can connect to this database. This column is used to protect the template0 database from being altered.
datconnlimit	integer	Maximum number of concurrent connections allowed on this database. -1 indicates no limit.
datlastsysoid	oid	Last system OID in the database
datfrozenxid	xid32	Tracks whether the database needs to be vacuumed in order to prevent transaction ID wraparound. To ensure forward compatibility, this column is reserved. The datfrozenxid64 column is added to record the information.
dattablespace	oid	Default tablespace of the database
datcompatibility	name	Database compatibility mode
datacl	aclitem[]	Access permissions
datfrozenxid64	xid	Tracks whether the database needs to be vacuumed in order to prevent transaction ID wraparound.