第 52 章 系统目录
目录
- 52.1. 概述
- 52.2.
pg_aggregate - 52.3.
pg_am - 52.4.
pg_amop - 52.5.
pg_amproc - 52.6.
pg_attrdef - 52.7.
pg_attribute - 52.8.
pg_authid - 52.9.
pg_auth_members - 52.10.
pg_cast - 52.11.
pg_class - 52.12.
pg_collation - 52.13.
pg_constraint - 52.14.
pg_conversion - 52.15.
pg_database - 52.16.
pg_db_role_setting - 52.17.
pg_default_acl - 52.18.
pg_depend - 52.19.
pg_description - 52.20.
pg_enum - 52.21.
pg_event_trigger - 52.22.
pg_extension - 52.23.
pg_foreign_data_wrapper - 52.24.
pg_foreign_server - 52.25.
pg_foreign_table - 52.26.
pg_index - 52.27.
pg_inherits - 52.28.
pg_init_privs - 52.29.
pg_language - 52.30.
pg_largeobject - 52.31.
pg_largeobject_metadata - 52.32.
pg_namespace - 52.33.
pg_opclass - 52.34.
pg_operator - 52.35.
pg_opfamily - 52.36.
pg_partitioned_table - 52.37.
pg_policy - 52.38.
pg_proc - 52.39.
pg_publication - 52.40.
pg_publication_rel - 52.41.
pg_range - 52.42.
pg_replication_origin - 52.43.
pg_rewrite - 52.44.
pg_seclabel - 52.45.
pg_sequence - 52.46.
pg_shdepend - 52.47.
pg_shdescription - 52.48.
pg_shseclabel - 52.49.
pg_statistic - 52.50.
pg_statistic_ext - 52.51.
pg_statistic_ext_data - 52.52.
pg_subscription - 52.53.
pg_subscription_rel - 52.54.
pg_tablespace - 52.55.
pg_transform - 52.56.
pg_trigger - 52.57.
pg_ts_config - 52.58.
pg_ts_config_map - 52.59.
pg_ts_dict - 52.60.
pg_ts_parser - 52.61.
pg_ts_template - 52.62.
pg_type - 52.63.
pg_user_mapping - 52.64. 系统视图
- 52.65.
pg_available_extensions - 52.66.
pg_available_extension_versions - 52.67.
pg_backend_memory_contexts - 52.68.
pg_config - 52.69.
pg_cursors - 52.70.
pg_file_settings - 52.71.
pg_group - 52.72.
pg_hba_file_rules - 52.73.
pg_indexes - 52.74.
pg_locks - 52.75.
pg_matviews - 52.76.
pg_policies - 52.77.
pg_prepared_statements - 52.78.
pg_prepared_xacts - 52.79.
pg_publication_tables - 52.80.
pg_replication_origin_status - 52.81.
pg_replication_slots - 52.82.
pg_roles - 52.83.
pg_rules - 52.84.
pg_seclabels - 52.85.
pg_sequences - 52.86.
pg_settings - 52.87.
pg_shadow - 52.88.
pg_shmem_allocations - 52.89.
pg_stats - 52.90.
pg_stats_ext - 52.91.
pg_stats_ext_exprs - 52.92.
pg_tables - 52.93.
pg_timezone_abbrevs - 52.94.
pg_timezone_names - 52.95.
pg_user - 52.96.
pg_user_mappings - 52.97.
pg_views
系统目录是关系型数据库管理系统存放模式元数据的地方，例如表和列的信息以及内部记账信息。PostgreSQL 的系统目录是普通表。你可以删除并重建这些表、增加列、插入和更新值，并借此把系统严重搞坏。通常，不应手工修改系统目录，通常都有 SQL 命令可用于完成这些操作。（例如，CREATE DATABASE 会向 pg_database 目录中插入一行 — 并且实际上会在磁盘上创建该数据库。）对于某些特别深奥的操作，确实存在少数例外，但随着时间推移，其中很多也已经可以通过 SQL 命令完成，因此直接操纵系统目录的需求正越来越少。
52.1. 概述 #
表 52.1 列出了系统目录。每个目录更详细的文档见后文。
大多数系统目录在创建数据库时都会从模板数据库复制过来，因此之后是数据库专有的。少数目录在物理上由一个集簇中的所有数据库共享；这些目录会在各自的说明中注明。
表 52.1. 系统目录
报告文档问题
阅读 上游文档. 通过 PostgreSQL 文档反馈表单.