(1ROW) 由此可见,pg_table_size是pg_relation_size所有返回值的总和。 而pg_total_relation_size是pg_table_size和pg_indexes_size的总和。 如果您想知道表正在使用多少空间,请使用pg_table_size和pg_total_relation_size考虑它们-一个数字是仅表的,一个数字是表+索引的。 检查存储文件的布局,以获取有关fsm,v...
select datname, pg_size_pretty (pg_database_size(datname)) AS size from pg_database; 查询表大小 -- 查询单个表大小 select pg_size_pretty(pg_relation_size('mytab')) as size; -- 查询所有表大小 select relname, pg_size_pretty(pg_relation_size(relid)) as size from pg_stat_user_tab...
Postgresql采用数据库采用实例buffer和操作系统buffer双缓存(effective_cache_size)的工作模式，这一点两者还...
SELECTrelnameASTABLE_NAME,pg_size_pretty(pg_relation_size(schemaname||'.'||relname))AStable_size,n_dead_tup,n_live_tup,(n_dead_tup*100/(n_live_tup+n_dead_tup))ASdead_tup_ratioFROMpg_stat_user_tablesWHEREn_dead_tup<>0order by5descLIMIT10; 查看数据库用户连接数 代码语言:javascript 代...
pg_relation_size(relid)/1024/1024 as "size_Mb", to_char(r.reltuples,'999999999999999999999') as "table_cnt" from pg_stat_user_tables t inner join pg_namespace n on t.schemaname = n.nspname inner join pg_class r on r.relname = t.relname ...
select relname, pg_size_pretty(pg_relation_size(oid)) finsertrom pg_class where relname like 't\_%' or relname='t1' order by relname; 3)查看索引支持的类型 select opfname from pg_opfamily, pg_am where opfmethod = pg_am.oid and amname='btree' order by 1; 4)查看所有支持的操作符...
3中方法,不论什么一个都行 方法一 ,查一个表select pg_size_pretty(pg_relation_size('table_name')); 方法二 ,查出全部表并按大小排序 SELECT table_schema || '.' || table_name AS table_full_name, pg_size_pretty(pg_total_rel 知识
select relname,pg_size_pretty(pg_relation_size(relid))from pg_stat_user_tables where schemaname='public'order by pg_relation_size(relid)desc image.png 接下来,查询前五名最耗IO的SQL,相关命令如下: select*from pg_stat_statements order by(blk_read_time+blk_write_time)desc limit 5 image.png ...
LEFT JOIN pg_namespace n ON n.oid=c.relnamespace WHERE c.relkind=ANY(ARRAY['r','t']) AND c.relname LIKE'test1'; 6.查看索引的大小 这是一种非常简单的方法来获取PostgreSQL索引的大小,test1_id_index指建的索引名。 SELECT pg_size_pretty(pg_relation_size('test1_id_index')); ...
ORDER BY pg_relation_size(C.oid) DESC LIMIT 20; 各表大小: SELECT *, pg_size_pretty(total_bytes) AS total , pg_size_pretty(index_bytes) AS INDEX , pg_size_pretty(toast_bytes) AS toast , pg_size_pretty(table_bytes) AS TABLE ...