pg_database stores information about the available databases. Databases are created with the
CREATE DATABASE command. Consult Chapter 21 for details about the meaning of some of the parameters.
Unlike most system catalogs,
pg_database is shared across all databases of a cluster: there is only one copy of
pg_database per cluster, not one per database.
Owner of the database, usually the user who created it
Character encoding for this database (
Locale provider for this database:
If true, then this database can be cloned by any user with
If false then no one can connect to this database. This is used to protect the
Sets maximum number of concurrent connections that can be made to this database. -1 means no limit, -2 indicates the database is invalid.
All transaction IDs 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
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
The default tablespace for the database. Within this database, all tables for which
LC_COLLATE for this database
LC_CTYPE for this database
ICU locale ID for this database
ICU collation rules for this database
Provider-specific version of the collation. This is recorded when the database is created and then checked when it is used, to detect changes in the collation definition that could lead to data corruption.
Access privileges; see Section 5.7 for details