oracle维护常用的SQL

-------------cpu_time占用top 10的sql------------
select cpu_time,sql_text from
(
select sql_text,cpu_time,rank() over (order by cpu_time desc) exec_rank
from v$sql
)
where exec_rank <= 10
/
-------------执行次数最多的top 10---------------
select sql_text,executions
from (select sql_text,executions,
   rank() over
    (order by executions desc) exec_rank
   from v$sql)
where exec_rank <=10
/

-------------查看表空间的名称及大小-------------
select t.tablespace_name, round(sum(bytes/(1024*1024)),0) ts_size
from dba_tablespaces t, dba_data_files d
where t.tablespace_name = d.tablespace_name
group by t.tablespace_name
/

-------------查看表空间物理文件的名称及大小--------------
select tablespace_name, file_id, file_name,
round(bytes/(1024*1024),0) total_space
from dba_data_files
order by tablespace_name
/

-------------查看回滚段名称及大小--------------
select segment_name, tablespace_name, r.status,
(initial_extent/1024) InitialExtent,(next_extent/1024) NextExtent,
max_extents, v.curext CurExtent
From dba_rollback_segs r, v$rollstat v
Where r.segment_id = v.usn(+)
order by segment_name
/

----------------查看控制文件-------------------
select name from v$controlfile
/

-------------查看日志文件 --------------------
select member from v$logfile
/

----------查看表空间的使用情况--------------
select sum(bytes)/(1024*1024) as free_space,tablespace_name
from dba_free_space
group by tablespace_name
/
SELECT A.TABLESPACE_NAME,A.BYTES TOTAL,B.BYTES USED, C.BYTES FREE,
(B.BYTES*100)/A.BYTES "% USED",(C.BYTES*100)/A.BYTES "% FREE"
FROM SYS.SM$TS_AVAIL A,SYS.SM$TS_USED B,SYS.SM$TS_FREE C
WHERE A.TABLESPACE_NAME=B.TABLESPACE_NAME
AND A.TABLESPACE_NAME=C.TABLESPACE_NAME
/

----------查看数据库库对象 -----------------
select owner, object_type, status, count(*) count#
from all_objects
group by owner, object_type, status
/

----------查看数据库的版本-------------------
Select version FROM Product_component_version
Where SUBSTR(PRODUCT,1,6)='Oracle'
/
---------查看数据库的创建日期和归档方式------------
Select Created, Log_Mode, Log_Mode
From V$Database
/

-----------查看还没提交的事务----------------
select * from v$locked_object;
select * from v$transaction
/

转自：http://dolphin-ygj.iteye.com/blog/361785