# System Catalogs Definitions

System catalog table and view definitions in alphabetical order.

- **[gp_segment_configuration](./system_catalog_definitions/gp_segment_configuration.md)**
- **[gp_distribution_policy](./system_catalog_definitions/gp_distribution_policy.md)**
- **[pg_aggregate](./system_catalog_definitions/pg_aggregate.md)**
- **[pg_am](./system_catalog_definitions/pg_am.md)**
- **[pg_amop](./system_catalog_definitions/pg_amop.md)**
- **[pg_amproc](./system_catalog_definitions/pg_amproc.md)**
- **[pg_attrdef](./system_catalog_definitions/pg_attrdef.md)**
- **[pg_attribute](./system_catalog_definitions/pg_attribute.md)**
- **[pg_attribute_encoding]()**
- **[pg_auth_members](./system_catalog_definitions/pg_auth_members.md)**
- **[pg_authid](./system_catalog_definitions/pg_authid.md)**
- **[pg_cast](./system_catalog_definitions/pg_cast.md)**
- **[pg_class](./system_catalog_definitions/pg_class.md)**
- **[pg_compression](./system_catalog_definitions/pg_compression.md)**
- **[pg_constraint](./system_catalog_definitions/pg_constraint.md)**
- **[pg_conversion](./system_catalog_definitions/pg_conversion.md)**
- **[pg_cursors](./system_catalog_definitions/pg_cursors.md)**
- **[pg_database](./system_catalog_definitions/pg_database.md)**
- **[pg_default_acl](./system_catalog_definitions/pg_default_acl.md)**
- **[pg_depend](./system_catalog_definitions/pg_depend.md)**
- **[pg_description](./system_catalog_definitions/pg_description.md)**
- **[pg_enum](./system_catalog_definitions/pg_enum.md)**
- **[pg_index](./system_catalog_definitions/pg_index.md)**
- **[pg_inherits](./system_catalog_definitions/pg_inherits.md)**
- **[pg_language](./system_catalog_definitions/pg_language.md)**
- **[pg_namespace](./system_catalog_definitions/pg_namespace.md)**
- **[pg_opclass](./system_catalog_definitions/pg_opclass.md)**
- **[pg_operator](./system_catalog_definitions/pg_operator.md)**
- **[pg_pltemplate](./system_catalog_definitions/pg_pltemplate.md)**
- **[pg_prepared_statements](./system_catalog_definitions/pg_prepared_statements.md)**
- **[pg_policy](./system_catalog_definitions/pg_policy.md)**
- **[pg_proc](./system_catalog_definitions/pg_proc.md)**
- **[pg_resgroup](./system_catalog_definitions/pg_resgroup.md)**
- **[pg_resgroupcapability](./system_catalog_definitions/pg_resgroupcapability.md)**
- **[pg_resourcetype](./system_catalog_definitions/pg_resourcetype.md)**
- **[pg_resqueue](./system_catalog_definitions/pg_resqueue.md)**
- **[pg_resqueuecapability](./system_catalog_definitions/pg_resqueuecapability.md)
- **[pg_resqueue_status](./system_catalog_definitions/pg_resqueue_status.md)**
- **[pg_rewrite](./system_catalog_definitions/pg_rewrite.md)**
- **[pg_roles](./system_catalog_definitions/pg_roles.md)**
- **[pg_rules](./system_catalog_definitions/pg_rules.md)**
- **[pg_settings](./system_catalog_definitions/pg_settings.md)**
- **[pg_shadow](./system_catalog_definitions/pg_shadow.md)**
- **[pg_shdepend](./system_catalog_definitions/pg_shdepend.md)**
- **[pg_shdescription](./system_catalog_definitions/pg_shdescription.md)**
- **[pg_statistic](./system_catalog_definitions/pg_statistic.md)**
- **[pg_stat_last_operation](./system_catalog_definitions/pg_stat_last_operation.md)**
- **[pg_stat_last_shoperation](./system_catalog_definitions/pg_stat_last_shoperation.md)**
- **[pg_stats](./system_catalog_definitions/pg_stats.md)**
- **[pg_statistic_ext](./system_catalog_definitions/pg_statistic_ext.md)**
- **[pg_statistic_ext_data](./system_catalog_definitions/pg_statistic_ext_data.md)**
- **[pg_stat_activity](./system_catalog_definitions/pg_stat_activity.md)**
- **[pg_stat_activity_global](./system_catalog_definitions/pg_stat_activity_global.md)**
- **[pg_tables](./system_catalog_definitions/pg_tables.md)**
- **[pg_tablespace](./system_catalog_definitions/pg_tablespace.md)**
- **[pg_trigger](./system_catalog_definitions/pg_trigger.md)**
- **[pg_type](./system_catalog_definitions/pg_type.md)**
- **[pg_type_encoding](./system_catalog_definitions/pg_type_encoding.md)**
- **[oushu_vcluster](./system_catalog_definitions/oushu_vcluster.md)**
- **[oushu_locks](./system_catalog_definitions/oushu_locks.md)**