【GaussDB】查看表和数据库信息 |
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查询表信息
使用系统表pg_tables查询数据库所有表的信息 select * from pg_tables; -- 查看某个schema下的表信息 select* from pg_tables where schemaname = 'shemaname'使用函数pg_get_tabledef查询表定义 select * from pg_get_tabledef('shemaname.tablename')查询表是否做过表分析,执行如下命令会返回每个表最近一次做analyze的时间,没有返回时间的则表示没有做过analyze select pg_stat_get_last_analyze_time(oid),relname from pg_class where relkind='r';查询public下的表做表分析的时间 select pg_stat_get_last_analyze_time(c.oid),c.relname from pg_class c left join pg_namespace n on c.relnamespace = n.oid where c.relkind='r' and n.nspname='public' ; 查询表大小查询表的总大小(包含表的索引和数据) select pg_size_pretty(pg_total_relation_size('schemaname.tablename'));查询表的数据大小(不包括索引) select pg_size_pretty(pg_relation_size('schemaname.tablename'));查询系统中所有表占用空间大小排行 select table_schema || '.' || table_name as table_full_name ,pg_size_pretty(pg_total_relation_size('"' || table_schema || '"."' || table_name || '"')) as size from information_schema.tables order by pg_total_relation_size('"' || table_schema || '"."' || table_name || '"') desc limit xx; -- 查看某个schema下表占用空间大小 select table_schema || '.' || table_name as table_full_name ,pg_size_pretty(pg_total_relation_size('"' || table_schema || '"."' || table_name || '"')) as size from information_schema.tables where table_schema = 'schemaname' order by pg_total_relation_size('"' || table_schema || '"."' || table_name || '"') desc limit xx; 查询数据库通过系统表pg_database查询数据库列表 select datname from pg_database; 查询数据库大小查询数据库的大小 select datname,pg_size_pretty(pg_database_size(datname)) from pg_database; |
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