Postgresql有哪些常用命令

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--设置模式set search_path to firsoul;--默认只列出当前模式下的表\d--列出常用模式\dn--列出所有模式\dnS--查看表的大小select pg_size_pretty(pg_relation_size('test'));--or\dt+ test--infoSELECT n.nspname as "Schema",  c.relname as "Name",  CASE c.relkind WHEN 'r' THEN 'table' WHEN 'v' THEN 'view' WHEN 'm' THEN 'materialized view' WHEN 'i' THEN 'index' WHEN 'S' THEN 'sequence' WHEN 's' THEN 'special' WHEN 'f' THEN 'foreign table' WHEN 'p' THEN 'table' END as "Type",  pg_catalog.pg_get_userbyid(c.relowner) as "Owner",  pg_catalog.pg_size_pretty(pg_catalog.pg_table_size(c.oid)) as "Size",  pg_catalog.obj_description(c.oid, 'pg_class') as "Description"FROM pg_catalog.pg_class c     LEFT JOIN pg_catalog.pg_namespace n ON n.oid = c.relnamespaceWHERE c.relkind IN ('r','p','s','')      AND n.nspname !~ '^pg_toast'  AND c.relname OPERATOR(pg_catalog.~) '^(test)$'  AND pg_catalog.pg_table_is_visible(c.oid)ORDER BY 1,2;--查看模式大小,表，索引select schemaname ,round(sum(pg_total_relation_size(schemaname||'.'||tablename))/1024/1024) "Size_MB" from pg_tables where schemaname='public' group by 1;select schemaname ,round(sum(pg_total_relation_size(schemaname||'.'||tablename))/1024/1024) "Size_MB" from pg_tables where schemaname='public' group by 1;select schemaname ,round(sum(pg_total_relation_size(schemaname||'.'||indexname))/1024/1024) "Size_MB" from pg_indexes where schemaname='public' group by 1;--查询数据库大小select datname,pg_size_pretty(pg_database_size(datname)) from pg_database;

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