历史版本。 PostgreSQL 9.1 已结束支持。 2016-10-27. 请参阅 当前版本手册.
第 45 章 系统目录
目录
- 45.1. 概述
- 45.2.
pg_aggregate - 45.3.
pg_am - 45.4.
pg_amop - 45.5.
pg_amproc - 45.6.
pg_attrdef - 45.7.
pg_attribute - 45.8.
pg_authid - 45.9.
pg_auth_members - 45.10.
pg_cast - 45.11.
pg_class - 45.12.
pg_constraint - 45.13.
pg_collation - 45.14.
pg_conversion - 45.15.
pg_database - 45.16.
pg_db_role_setting - 45.17.
pg_default_acl - 45.18.
pg_depend - 45.19.
pg_description - 45.20.
pg_enum - 45.21.
pg_extension - 45.22.
pg_foreign_data_wrapper - 45.23.
pg_foreign_server - 45.24.
pg_foreign_table - 45.25.
pg_index - 45.26.
pg_inherits - 45.27.
pg_language - 45.28.
pg_largeobject - 45.29.
pg_largeobject_metadata - 45.30.
pg_namespace - 45.31.
pg_opclass - 45.32.
pg_operator - 45.33.
pg_opfamily - 45.34.
pg_pltemplate - 45.35.
pg_proc - 45.36.
pg_rewrite - 45.37.
pg_seclabel - 45.38.
pg_shdepend - 45.39.
pg_shdescription - 45.40.
pg_statistic - 45.41.
pg_tablespace - 45.42.
pg_trigger - 45.43.
pg_ts_config - 45.44.
pg_ts_config_map - 45.45.
pg_ts_dict - 45.46.
pg_ts_parser - 45.47.
pg_ts_template - 45.48.
pg_type - 45.49.
pg_user_mapping - 45.50. 系统视图
- 45.51.
pg_available_extensions - 45.52.
pg_available_extension_versions - 45.53.
pg_cursors - 45.54.
pg_group - 45.55.
pg_indexes - 45.56.
pg_locks - 45.57.
pg_prepared_statements - 45.58.
pg_prepared_xacts - 45.59.
pg_roles - 45.60.
pg_rules - 45.61.
pg_seclabels - 45.62.
pg_settings - 45.63.
pg_shadow - 45.64.
pg_stats - 45.65.
pg_tables - 45.66.
pg_timezone_abbrevs - 45.67.
pg_timezone_names - 45.68.
pg_user - 45.69.
pg_user_mappings - 45.70.
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、插入和更新数值，并借此把系统严重搞坏。通常，不应手工修改系统目录，总是有 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存在一些例外，例如增加索引访问方法。
45.1. 概述 #
表 45.1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 45.1. 系统目录
| Catalog Name | Purpose |
|---|---|
pg_aggregate | aggregate functions |
pg_am | index access methods |
pg_amop | access method operators |
pg_amproc | access method support procedures |
pg_attrdef | column default values |
pg_attribute | table columns (“attributes”) |
pg_authid | authorization identifiers (roles) |
pg_auth_members | authorization identifier membership relationships |
pg_cast | casts (data type conversions) |
pg_class | tables, indexes, sequences, views (“relations”) |
pg_constraint | check constraints, unique constraints, primary key constraints, foreign key constraints |
pg_collation | collations (locale information) |
pg_conversion | encoding conversion information |
pg_database | databases within this database cluster |
pg_db_role_setting | per-role and per-database settings |
pg_default_acl | default privileges for object types |
pg_depend | dependencies between database objects |
pg_description | descriptions or comments on database objects |
pg_enum | enum label and value definitions |
pg_extension | installed extensions |
pg_foreign_data_wrapper | foreign-data wrapper definitions |
pg_foreign_server | foreign server definitions |
pg_foreign_table | additional foreign table information |
pg_index | additional index information |
pg_inherits | table inheritance hierarchy |
pg_language | languages for writing functions |
pg_largeobject | data pages for large objects |
pg_largeobject_metadata | metadata for large objects |
pg_namespace | schemas |
pg_opclass | access method operator classes |
pg_operator | operators |
pg_opfamily | access method operator families |
pg_pltemplate | template data for procedural languages |
pg_proc | functions and procedures |
pg_rewrite | query rewrite rules |
pg_seclabel | security labels on database objects |
pg_shdepend | dependencies on shared objects |
pg_shdescription | comments on shared objects |
pg_statistic | planner statistics |
pg_tablespace | tablespaces within this database cluster |
pg_trigger | triggers |
pg_ts_config | text search configurations |
pg_ts_config_map | text search configurations' token mappings |
pg_ts_dict | text search dictionaries |
pg_ts_parser | text search parsers |
pg_ts_template | text search templates |
pg_type | data types |
pg_user_mapping | mappings of users to foreign servers |