PostgreSQL

oid

oid

Row identifier (hidden attribute; must be explicitly selected)

datname

name

Database name

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

bool

If true, then this database can be cloned by any user with CREATEDB privileges; if false, then only superusers or the owner of the database can clone it.

datallowconn

bool

If false then no one can connect to this database. This is used to protect the template0 database from being altered.

datconnlimit

int4

Sets maximum number of concurrent connections that can be made to this database. -1 means no limit, -2 indicates the database is invalid.

datlastsysoid

oid

Last system OID in the database; useful particularly to pg_dump

datfrozenxid

xid

All transaction IDs before this one have been replaced with a permanent (“[.quote]#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_xact to be shrunk. It is the minimum of the per-table pg_class.relfrozenxid values.

datminmxid

xid

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; in particular, all the non-shared system catalogs will be there.

datacl

aclitem[]

Access privileges; see GRANT and REVOKE for details