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Updated on 2023-10-31 GMT+08:00
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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

Character encoding for this database

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.

Example

Run the following command to view the owner, compatibility mode, and access permissions of a database:

View the encoding of a database:

SELECT pg_encoding_to_char(encoding) FROM pg_database WHERE datname='database_name';
Parent topic: System Catalogs