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章 47. 系统表

目录
47.1. 概述
47.2. pg_aggregate
47.3. pg_am
47.4. pg_amop
47.5. pg_amproc
47.6. pg_attrdef
47.7. pg_attribute
47.8. pg_authid
47.9. pg_auth_members
47.10. pg_cast
47.11. pg_class
47.12. pg_event_trigger
47.13. pg_constraint
47.14. pg_collation
47.15. pg_conversion
47.16. pg_database
47.17. pg_db_role_setting
47.18. pg_default_acl
47.19. pg_depend
47.20. pg_description
47.21. pg_enum
47.22. pg_extension
47.23. pg_foreign_data_wrapper
47.24. pg_foreign_server
47.25. pg_foreign_table
47.26. pg_index
47.27. pg_inherits
47.28. pg_language
47.29. pg_largeobject
47.30. pg_largeobject_metadata
47.31. pg_namespace
47.32. pg_opclass
47.33. pg_operator
47.34. pg_opfamily
47.35. pg_pltemplate
47.36. pg_proc
47.37. pg_range
47.38. pg_rewrite
47.39. pg_seclabel
47.40. pg_shdepend
47.41. pg_shdescription
47.42. pg_shseclabel
47.43. pg_statistic
47.44. pg_tablespace
47.45. pg_trigger
47.46. pg_ts_config
47.47. pg_ts_config_map
47.48. pg_ts_dict
47.49. pg_ts_parser
47.50. pg_ts_template
47.51. pg_type
47.52. pg_user_mapping
47.53. 系统视图
47.54. pg_available_extensions
47.55. pg_available_extension_versions
47.56. pg_cursors
47.57. pg_group
47.58. pg_indexes
47.59. pg_locks
47.60. pg_matviews
47.61. pg_prepared_statements
47.62. pg_prepared_xacts
47.63. pg_roles
47.64. pg_rules
47.65. pg_seclabels
47.66. pg_settings
47.67. pg_shadow
47.68. pg_stats
47.69. pg_tables
47.70. pg_timezone_abbrevs
47.71. pg_timezone_names
47.72. pg_user
47.73. pg_user_mappings
47.74. pg_views

系统表是关系型数据库管理系统存放结构元数据的地方,比如表和字段以及内部登记信息等。 PostgreSQL的系统表就是普通表。你可以删除然后重建这些表、 增加列、插入和更新数值,然后彻底把系统搞垮。不应该手工修改系统表, 通常总有 SQL 命令可以做这些事情。比如,CREATE DATABASEpg_database表插入一行,并且实际上在磁盘上创建该数据库。 有几种特别深奥的操作例外,比如增加索引访问方法。