| pg_aggregate | aggregate functions |
| pg_am | index access methods |
| pg_amop | access method operators |
| pg_amproc | access method support procedures |
| pg_attrdef | column default values |
| pg_attribute | table columns ("attributes") |
| pg_authid | authorization identifiers (roles) |
| pg_auth_members | authorization identifier membership relationships |
| pg_autovacuum | per-relation autovacuum configuration parameters |
| pg_cast | casts (data type conversions) |
| pg_class | tables, indexes, sequences, views ("relations") |
| pg_constraint | check constraints, unique constraints, primary key constraints, foreign key constraints |
| pg_conversion | encoding conversion information |
| pg_database | databases within this database cluster |
| pg_depend | dependencies between database objects |
| pg_description | descriptions or comments on database objects |
| pg_index | additional index information |
| pg_inherits | table inheritance hierarchy |
| pg_language | languages for writing functions |
| pg_largeobject | large objects |
| pg_listener | asynchronous notification support |
| pg_namespace | schemas |
| pg_opclass | index access method operator classes |
| pg_operator | operators |
| pg_pltemplate | template data for procedural languages |
| pg_proc | functions and procedures |
| pg_rewrite | query rewrite rules |
| pg_shdepend | dependencies on shared objects |
| pg_shdescription | comments on shared objects |
| pg_statistic | planner statistics |
| pg_tablespace | tablespaces within this database cluster |
| pg_trigger | triggers |
| pg_type | data types |