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_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_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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