常用SQL命令

1、查看所有表的物理大小

1 select segment_name, bytes from user_segments  order by bytes desc

2、查看表空間的名稱及大小

1 select t.tablespace_name, round(sum(bytes/(1024*1024)),0) ts_size
2 from dba_tablespaces t, dba_data_files d
3 where t.tablespace_name = d.tablespace_name
4 group by t.tablespace_name;

2、查看表空間物理檔的名稱及大小

1 select tablespace_name, file_id, file_name,
2 round(bytes/(1024*1024),0) total_space
3 from dba_data_files
4 order by tablespace_name;

3、查看回滾段名稱及大小

1 select segment_name, tablespace_name, r.status,
2 (initial_extent/1024) InitialExtent,(next_extent/1024) NextExtent,
3 max_extents, v.curext CurExtent
4 From dba_rollback_segs r, v$rollstat v
5 Where r.segment_id = v.usn(+)
6 order by segment_name;

4、查看控制文件

1 select name from v$controlfile;

5、查看日誌檔

1 select member from v$logfile;

6、查看表空間的使用情況

1 select sum(bytes)/(1024*1024) as free_space,tablespace_name
2 from dba_free_space
3 group by tablespace_name;

常用SQL命令,布布扣,bubuko.com