系统目录
From PostgreSQL
章 50. 系统目录
- 目录
- 50.1. 概述
- 50.2. pg_aggregate
- 50.3. pg_am
- 50.4. pg_amop
- 50.5. pg_amproc
- 50.6. pg_attrdef
- 50.7. pg_attribute
- 50.8. pg_authid
- 50.9. pg_auth_members
- 50.10. pg_cast
- 50.11. pg_class
- 50.12. pg_collation
- 50.13. pg_constraint
- 50.14. pg_conversion
- 50.15. pg_database
- 50.16. pg_db_role_setting
- 50.17. pg_default_acl
- 50.18. pg_depend
- 50.19. pg_description
- 50.20. pg_enum
- 50.21. pg_event_trigger
- 50.22. pg_extension
- 50.23. pg_foreign_data_wrapper
- 50.24. pg_foreign_server
- 50.25. pg_foreign_table
- 50.26. pg_index
- 50.27. pg_inherits
- 50.28. pg_init_privs
- 50.29. pg_language
- 50.30. pg_largeobject
- 50.31. pg_largeobject_metadata
- 50.32. pg_namespace
- 50.33. pg_opclass
- 50.34. pg_operator
- 50.35. pg_opfamily
- 50.36. pg_pltemplate
- 50.37. pg_policy
- 50.38. pg_proc
- 50.39. pg_range
- 50.40. pg_replication_origin
- 50.41. pg_rewrite
- 50.42. pg_seclabel
- 50.43. pg_shdepend
- 50.44. pg_shdescription
- 50.45. pg_shseclabel
- 50.46. pg_statistic
- 50.47. pg_tablespace
- 50.48. pg_transform
- 50.49. pg_trigger
- 50.50. pg_ts_config
- 50.51. pg_ts_config_map
- 50.52. pg_ts_dict
- 50.53. pg_ts_parser
- 50.54. pg_ts_template
- 50.55. pg_type
- 50.56. pg_user_mapping
- 50.57. System Views
- 50.58. pg_available_extensions
- 50.59. pg_available_extension_versions
- 50.60. pg_config
- 50.61. pg_cursors
- 50.62. pg_file_settings
- 50.63. pg_group
- 50.64. pg_indexes
- 50.65. pg_locks
- 50.66. pg_matviews
- 50.67. pg_policies
- 50.68. pg_prepared_statements
- 50.69. pg_prepared_xacts
- 50.70. pg_replication_origin_status
- 50.71. pg_replication_slots
- 50.72. pg_roles
- 50.73. pg_rules
- 50.74. pg_seclabels
- 50.75. pg_settings
- 50.76. pg_shadow
- 50.77. pg_stats
- 50.78. pg_tables
- 50.79. pg_timezone_abbrevs
- 50.80. pg_timezone_names
- 50.81. pg_user
- 50.82. pg_user_mappings
- 50.83. pg_views
系统目录是关系型数据库存放模式元数据的地方，比如表和列的信息，以及内部统计信息等。PostgreSQL的系统目录就是普通表。你可以删除并重建这些表、增加列、插入和更新数值， 然后彻底把你的系统搞垮。 通常情况下，我们不应该手工修改系统目录，通常有SQL命令可以做这些事情。（例如，CREATE DATABASE向 pg_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，但是随着时间的流逝其中的很多也可以用 SQL 命令来完成，因此对系统目录直接修改的需求也越来越小。