【GaussDB】查看表和数据库信息

2024-07-17 18:40| 来源: 网络整理| 查看: 265

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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