【PG常用命令】postgresql数据库统计对象大小

--查看数据库大小，不计算索引select pg_size_pretty(pg_database_size('mydb'));--查看数据库大小，包含索引select pg_size_pretty(pg_total_size('mydb'));--查看表中索引大小select pg_size_pretty(pg_indexes_size('test_1'));--查看表大小,不包括索引select pg_size_pretty(pg_relation_size('test_1'));  --or\dt+ test_1--查看表大小,包括索引select pg_size_pretty(pg_total_relation_size('test_1'));  --查看某个模式大小，包括索引。不包括索引可用pg_relation_sizeselect schemaname,round(sum(pg_total_relation_size(schemaname||'.'||tablename))/1024/1024) "Mb" from pg_tables where schemaname='mysch' group by 1;--查看表空间大小select pg_size_pretty(pg_tablespace_size('pg_global'));--查看表对应的数据文件select pg_relation_filepath('test_1');--切换log日志文件到下一个select pg_rotate_logfile();--切换日志select pg_switch_xlog();checkpoint