查詢指定用戶下的總記錄條數

select owner,sum(a.num_rows) as TOTAL_ROWS from dba_tables  a
where owner in ('PORTAL_PROJ','DATASYNC_PROJ') group by owner;

備注：'PORTAL_PROJ'與'DATASYNC_PROJ'是指定的用戶名，根據實際情況修改即可，多個用戶之間以逗號進行分隔。

查詢指定用戶下的數據所占的空間大小，單位MB

select owner,sum(a.bytes)/1024/1024 as SizeMB from dba_segments  a
where owner in ('PORTAL_PROJ','DATASYNC_PROJ') group by owner;

備注：'PORTAL_PROJ'與'DATASYNC_PROJ'是指定的用戶名，根據實際情況修改即可，多個用戶之間以逗號進行分隔。

mysql的請參考鏈接:

http://www.lxweimin.com/p/f510315d0631