pg_database

datname

name

 — 

Database name

datdba

oid

pg_authid.oid

Owner of the database, usually the user that created it

encoding

integer

 — 

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

integer

 — 

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 0 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