登录第 53 章. 系统目录
目录
- 53.1. 概述
- 53.2.
pg_aggregate - 53.3.
pg_am - 53.4.
pg_amop - 53.5.
pg_amproc - 53.6.
pg_attrdef - 53.7.
pg_attribute - 53.8.
pg_authid - 53.9.
pg_auth_members - 53.10.
pg_cast - 53.11.
pg_class - 53.12.
pg_collation - 53.13.
pg_constraint - 53.14.
pg_conversion - 53.15.
pg_database - 53.16.
pg_db_role_setting - 53.17.
pg_default_acl - 53.18.
pg_depend - 53.19.
pg_description - 53.20.
pg_enum - 53.21.
pg_event_trigger - 53.22.
pg_extension - 53.23.
pg_foreign_data_wrapper - 53.24.
pg_foreign_server - 53.25.
pg_foreign_table - 53.26.
pg_index - 53.27.
pg_inherits - 53.28.
pg_init_privs - 53.29.
pg_language - 53.30.
pg_largeobject - 53.31.
pg_largeobject_metadata - 53.32.
pg_namespace - 53.33.
pg_opclass - 53.34.
pg_operator - 53.35.
pg_opfamily - 53.36.
pg_parameter_acl - 53.37.
pg_partitioned_table - 53.38.
pg_policy - 53.39.
pg_proc - 53.40.
pg_publication - 53.41.
pg_publication_namespace - 53.42.
pg_publication_rel - 53.43.
pg_range - 53.44.
pg_replication_origin - 53.45.
pg_rewrite - 53.46.
pg_seclabel - 53.47.
pg_sequence - 53.48.
pg_shdepend - 53.49.
pg_shdescription - 53.50.
pg_shseclabel - 53.51.
pg_statistic - 53.52.
pg_statistic_ext - 53.53.
pg_statistic_ext_data - 53.54.
pg_subscription - 53.55.
pg_subscription_rel - 53.56.
pg_tablespace - 53.57.
pg_transform - 53.58.
pg_trigger - 53.59.
pg_ts_config - 53.60.
pg_ts_config_map - 53.61.
pg_ts_dict - 53.62.
pg_ts_parser - 53.63.
pg_ts_template - 53.64.
pg_type - 53.65.
pg_user_mapping
系统目录是关系数据库管理系统存储模式元数据（例如有关表和列的信息）和内部记账信息的地方。PostgreSQL的系统目录是常规表。你可以删除并重新创建表、添加列、插入和更新值，并以这种方式严重搞乱你的系统。通常，不应该手动更改系统目录，通常有 SQL 命令可以执行此操作。（例如，CREATE DATABASE会将一行插入到pg_database目录中，并实际在磁盘上创建数据库。）对于特别深奥的操作有一些例外，但随着时间的推移，其中许多操作已作为 SQL 命令提供，因此对系统目录的直接操作的需求正在不断减少。