CockroachDB includes a set of system catalogs that provide non-stored data to client applications.
The following system catalogs are available as schemas preloaded to every database:
information_schema, a schema provided for compatibility with the SQL standard.
crdb_internal, a schema with information about CockroachDB internals.
pg_catalog, a schema provided for compatibility with PostgreSQL.
pg_extension, a schema catalog with information about CockroachDB extensions.
Tables in the system catalogs have varying levels of stability. Not all system catalog tables are meant for programmatic purposes. For more information, see API Support Policy.
> SHOW SCHEMAS;
schema_name | owner ---------------------+-------- crdb_internal | NULL information_schema | NULL pg_catalog | NULL pg_extension | NULL public | admin (5 rows)