1. --查看数据库
  2. select * from pg_database;
  4. --查看表空间
  5. select * from pg_tablespace;
  7. --查看语言
  8. select * from pg_language;
  10. --查看角色用户
  11. select * from pg_user;
  12. select * from pg_shadow;
  13. select * from pg_roles;
  15. --查看会话进程
  16. select * from pg_stat_activity;
  18. --查看表
  19. SELECT * FROM pg_tables where schemaname = 'public';
  21. --查看表字段
  22. select * from information_schema.columns where table_schema = 'public' and table_name = 'pf_vip_org';
  24. --查看视图
  25. select * from pg_views where schemaname = 'public';
  26. select * from information_schema.views where table_schema = 'public';
  28. --查看触发器
  29. select * from information_schema.triggers;
  31. --查看序列
  32. select * from information_schema.sequences where sequence_schema = 'public';
  34. --查看约束
  35. select * from pg_constraint where contype = 'p' 
  36. --u unique,p primary,f foreign,c check,t trigger,x exclusion
  38. select a.relname as table_name,b.conname as constraint_name,b.contype as constraint_type from pg_class a,pg_constraint b where a.oid = b.conrelid and a.relname = 'cc';
  40. --查看索引
  41. select * from pg_index ;
  43. --查看表上存在哪些索引以及大小
  44. select relname,n.amname as index_type from pg_class m,pg_am n where m.relam = n.oid and m.oid in (
  45. select b.indexrelid from pg_class a,pg_index b where a.oid = b.indrelid and a.relname = 'cc');
  47. SELECT c.relname,c2.relname, c2.relpages*8 as size_kb
  48. FROM pg_class c, pg_class c2, pg_index i
  49. WHERE c.relname = 'cc' AND
  50. c.oid = i.indrelid AND
  51. c2.oid = i.indexrelid
  52. ORDER BY c2.relname;
  54. --查看索引定义
  55. select b.indexrelid from pg_class a,pg_index b where a.oid = b.indrelid and a.relname = 'cc';
  56. select pg_get_indexdef(b.indexrelid);
  58. --查看过程函数定义
  59. select oid,* from pg_proc where proname = 'insert_platform_action_exist'; --oid = 24610
  60. select * from pg_get_functiondef(24610);
  62. --查看表大小(不含索引等信息)
  63. select pg_relation_size('cc');                         --368640 byte
  64. select pg_size_pretty(pg_relation_size('cc'))   --360 kB
  66. --查看DB大小
  67. select pg_size_pretty(pg_database_size('smiletao'));   --12M
  69. --查看服务器DB运行状态
  70. [postgres@eyar ~]$ pg_ctl status -D $PGDATA
  71. pg_ctl: server is running (PID: 2373)
  72. /home/postgres/bin/postgres "-D" "/database/pgdata"
  74. --查看每个DB的使用情况(读,写,缓存,更新,事务等)
  75. select * from pg_stat_database
  77. --查看索引的使用情况
  78. select * from pg_stat_user_indexes;
  80. --查看表所对应的数据文件路径与大小
  81. SELECT pg_relation_filepath(oid), relpages FROM pg_class WHERE relname = 'empsalary';
  83. --查看索引与相关字段及大小
  84. SELECT n.nspname AS schema_name,
  85.         r.rolname as table_owner,
  86.        bc.relname AS table_name,
  87.        ic.relname AS index_name,
  88.        a.attname  AS column_name,
  89.        bc.relpages*8 as index_size_kb    
  90.   FROM pg_namespace n,
  91.        pg_class bc,             -- base class
  92.        pg_class ic,             -- index class
  93.        pg_index i,
  94.        pg_attribute a,           -- att in base
  95.        pg_roles r
  96.   WHERE bc.relnamespace = n.oid
  97.      and i.indrelid = bc.oid
  98.      and i.indexrelid = ic.oid
  99.      and bc.relowner = r.oid
  100.      and i.indkey[0] = a.attnum
  101.      and i.indnatts = 1
  102.      and a.attrelid = bc.oid
  103.      and n.nspname = 'public'
  104.      and bc.relname = 'cc'
  105.   ORDER BY schema_name, table_name, index_name, attname;
  107. --查看PG锁
  108. select * from pg_locks;
  110. 备注：relpages*8 是实际所占磁盘大小
  112. --查看表空间大小
  113. select pg_tablespace_size('pg_default');
  115. --查看序列与表的对应关系
  116.   WITH fq_objects AS (SELECT c.oid,c.relname AS fqname ,
  117.                            c.relkind, c.relname AS relation
  118.                     FROM pg_class c JOIN pg_namespace n ON n.oid = c.relnamespace ),
  120.      sequences AS (SELECT oid,fqname FROM fq_objects WHERE relkind = 'S'),
  121.      tables    AS (SELECT oid, fqname FROM fq_objects WHERE relkind = 'r' )
  122.          SELECT
  123.        s.fqname AS sequence,
  124.        '->' as depends,
  125.        t.fqname AS table
  126.       FROM
  127.        pg_depend d JOIN sequences s ON s.oid = d.objid
  128.                  JOIN tables t ON t.oid = d.refobjid
  129.           WHERE
  130.        d.deptype = 'a' and t.fqname = 'cc';