第 51 章 系统目录
目录文章来源：https://www.toymoban.com/news/detail-505191.html
- 51.1. 概述
- 51.2.
pg_aggregate - 51.3.
pg_am - 51.4.
pg_amop - 51.5.
pg_amproc - 51.6.
pg_attrdef - 51.7.
pg_attribute - 51.8.
pg_authid - 51.9.
pg_auth_members - 51.10.
pg_cast - 51.11.
pg_class - 51.12.
pg_collation - 51.13.
pg_constraint - 51.14.
pg_conversion - 51.15.
pg_database - 51.16.
pg_db_role_setting - 51.17.
pg_default_acl - 51.18.
pg_depend - 51.19.
pg_description - 51.20.
pg_enum - 51.21.
pg_event_trigger - 51.22.
pg_extension - 51.23.
pg_foreign_data_wrapper - 51.24.
pg_foreign_server - 51.25.
pg_foreign_table - 51.26.
pg_index - 51.27.
pg_inherits - 51.28.
pg_init_privs - 51.29.
pg_language - 51.30.
pg_largeobject - 51.31.
pg_largeobject_metadata - 51.32.
pg_namespace - 51.33.
pg_opclass - 51.34.
pg_operator - 51.35.
pg_opfamily - 51.36.
pg_partitioned_table - 51.37.
pg_pltemplate - 51.38.
pg_policy - 51.39.
pg_proc - 51.40.
pg_publication - 51.41.
pg_publication_rel - 51.42.
pg_range - 51.43.
pg_replication_origin - 51.44.
pg_rewrite - 51.45.
pg_seclabel - 51.46.
pg_sequence - 51.47.
pg_shdepend - 51.48.
pg_shdescription - 51.49.
pg_shseclabel - 51.50.
pg_statistic - 51.51.
pg_statistic_ext - 51.52.
pg_statistic_ext_data - 51.53.
pg_subscription - 51.54.
pg_subscription_rel - 51.55.
pg_tablespace - 51.56.
pg_transform - 51.57.
pg_trigger - 51.58.
pg_ts_config - 51.59.
pg_ts_config_map - 51.60.
pg_ts_dict - 51.61.
pg_ts_parser - 51.62.
pg_ts_template - 51.63.
pg_type - 51.64.
pg_user_mapping - 51.65. 系统视图
- 51.66.
pg_available_extensions - 51.67.
pg_available_extension_versions - 51.68.
pg_config - 51.69.
pg_cursors - 51.70.
pg_file_settings - 51.71.
pg_group - 51.72.
pg_hba_file_rules - 51.73.
pg_indexes - 51.74.
pg_locks - 51.75.
pg_matviews - 51.76.
pg_policies - 51.77.
pg_prepared_statements - 51.78.
pg_prepared_xacts - 51.79.
pg_publication_tables - 51.80.
pg_replication_origin_status - 51.81.
pg_replication_slots - 51.82.
pg_roles - 51.83.
pg_rules - 51.84.
pg_seclabels - 51.85.
pg_sequences - 51.86.
pg_settings - 51.87.
pg_shadow - 51.88.
pg_stats - 51.89.
pg_stats_ext - 51.90.
pg_tables - 51.91.
pg_timezone_abbrevs - 51.92.
pg_timezone_names - 51.93.
pg_user - 51.94.
pg_user_mappings - 51.95.
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。文章来源地址https://www.toymoban.com/news/detail-505191.html
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