53.1. Overview
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## 53.1. Overview #

Table 53.1 lists the system views. More detailed documentation of each catalog follows below. Except where noted, all the views described here are read-only.

Table 53.1. System Views

View Name | Purpose
--- | ---
`pg_aios` | in-use asynchronous IO handles
`pg_available_extensions` | available extensions
`pg_available_extension_versions` | available versions of extensions
`pg_backend_memory_contexts` | backend memory contexts
`pg_config` | compile-time configuration parameters
`pg_cursors` | open cursors
`pg_dsm_registry_allocations` | shared memory allocations tracked in the DSM registry
`pg_file_settings` | summary of configuration file contents
`pg_group` | groups of database users
`pg_hba_file_rules` | summary of client authentication configuration file contents
`pg_ident_file_mappings` | summary of client user name mapping configuration file contents
`pg_indexes` | indexes
`pg_locks` | locks currently held or awaited
`pg_matviews` | materialized views
`pg_policies` | policies
`pg_prepared_statements` | prepared statements
`pg_prepared_xacts` | prepared transactions
`pg_publication_sequences` | publications and information of their associated sequences
`pg_publication_tables` | publications and information of their associated tables
`pg_replication_origin_status` | information about replication origins, including replication progress
`pg_replication_slots` | replication slot information
`pg_roles` | database roles
`pg_rules` | rules
`pg_seclabels` | security labels
`pg_sequences` | sequences
`pg_settings` | parameter settings
`pg_shadow` | database users
`pg_shmem_allocations` | shared memory allocations
`pg_shmem_allocations_numa` | NUMA node mappings for shared memory allocations
`pg_stats` | planner statistics
`pg_stats_ext` | extended planner statistics
`pg_stats_ext_exprs` | extended planner statistics for expressions
`pg_tables` | tables
`pg_timezone_abbrevs` | time zone abbreviations
`pg_timezone_names` | time zone names
`pg_user` | database users
`pg_user_mappings` | user mappings
`pg_views` | views
`pg_wait_events` | wait events

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