PG_DATABASE¶
PG_DATABASE records information about the available databases.
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:
SELECT datname, datdba,datcompatibility,datacl from pg_database where datname='database_name';
View the encoding of a database:
SELECT pg_encoding_to_char(encoding) FROM pg_database WHERE datname='database_name';