Oracle查询表空间使用情况以及其他查询

1.查询表空间使用情况

SELECT UPPER(F.TABLESPACE_NAME) "表空间名",　　D.TOT_GROOTTE_MB "表空间大小(M)",　　D.TOT_GROOTTE_MB - F.TOTAL_BYTES "已使用空间(M)",　　TO_CHAR(ROUND((D.TOT_GROOTTE_MB - F.TOTAL_BYTES) / D.TOT_GROOTTE_MB * 100,2),'990.99') || '%' "使用比",　　F.TOTAL_BYTES "空闲空间(M)",　　F.MAX_BYTES "最大块(M)"
　　FROM (SELECT TABLESPACE_NAME,　　ROUND(SUM(BYTES) / (1024 * 1024),2) TOTAL_BYTES,　　ROUND(MAX(BYTES) / (1024 * 1024),2) MAX_BYTES
　　FROM SYS.DBA_FREE_SPACE
　　GROUP BY TABLESPACE_NAME) F,　　(SELECT DD.TABLESPACE_NAME,　　 ROUND(SUM(DD.BYTES) / (1024 * 1024),2) TOT_GROOTTE_MB
　　FROM SYS.DBA_DATA_FILES DD
　　GROUP BY DD.TABLESPACE_NAME) D
　　WHERE D.TABLESPACE_NAME = F.TABLESPACE_NAME
　　ORDER BY 1;

2.查询表空间的free space

select tablespace_name,　　count(*) as extends,　　round(sum(bytes) / 1024 / 1024,2) as MB,　　sum(blocks) as blocks
　　from dba_free_space
　　group by tablespace_name;

3.查询表空间的总容量

select tablespace_name,sum(bytes) / 1024 / 1024 as MB
　　from dba_data_files
　　group by tablespace_name;

4.查询表空间使用率

select total.tablespace_name,　　round(total.MB,2) as Total_MB,考试大论坛
　　round(total.MB - free.MB,2) as Used_MB,　　round((1 - free.MB / total.MB) * 100,2) || '%' as Used_Pct
　　from (select tablespace_name,sum(bytes) / 1024 / 1024 as MB
　　from dba_free_space
　　group by tablespace_name) free,　　(select tablespace_name,sum(bytes) / 1024 / 1024 as MB
　　from dba_data_files
　　group by tablespace_name) total
　　where free.tablespace_name = total.tablespace_name;

5.查找当前表级锁的SQL如下

select sess.sid,sess.serial#,lo.oracle_username,lo.os_user_name,ao.object_name,lo.locked_mode 
    from v$locked_object lo,dba_objects ao,v$session sess 
where ao.object_id = lo.object_id and lo.session_id = sess.sid;

6.杀掉锁表进程

alter system kill session '436,35123';

7.RAC环境中锁查找

SELECT inst_id,DECODE(request,'Holder: ','Waiter: ')||sid sess,id1,id2,lmode,request,type,block,ctime
FROM GV$LOCK
WHERE (id1,type) IN
       (SELECT id1,type FROM GV$LOCK WHERE request>0)
ORDER BY id1,request;

8.监控当前数据库谁在运行什么SQL语句

select osuser,username,sql_text  
from  v$session a,v$sqltext b 
where  a.sql_address =b.address order by address,piece;

9.找使用CPU多的用户session

select a.sid,spid,status,substr(a.program,1,40) prog,a.terminal,osuser,value/60/100 value 
from  v$session a,v$process b,v$sesstat c 
where  c.statistic#=12 and  
       c.sid=a.sid and  
       a.paddr=b.addr  
       order by value desc;

10.查看死锁信息

SELECT (SELECT username
          FROM v$session
         WHERE SID = a.SID) blocker,a.SID,'is blocking',(SELECT username
          FROM v$session
         WHERE SID = b.SID) blockee,b.SID
  FROM v$lock a,v$lock b
 WHERE a.BLOCK = 1 AND b.request > 0 AND a.id1 = b.id1 AND a.id2 = b.id2;

11.具有最高等待的对象

SELECT   o.OWNER,o.object_name,o.object_type,a.event,SUM (a.wait_time + a.time_waited) total_wait_time
    FROM v$active_session_history a,dba_objects o
   WHERE a.sample_time BETWEEN SYSDATE - 30 / 2880 AND SYSDATE
     AND a.current_obj# = o.object_id
GROUP BY o.OWNER,a.event
ORDER BY total_wait_time DESC;

SELECT   a.session_id,s.osuser,s.machine,s.program,o.owner,dba_objects o,v$session s
   WHERE a.sample_time BETWEEN SYSDATE - 30 / 2880 AND SYSDATE
     AND a.current_obj# = o.object_id
     AND a.session_id = s.SID
GROUP BY o.owner,a.session_id,s.osuser
ORDER BY total_wait_time DESC;

12.查询当前连接会话数

select s.value,s.sid,a.username
from 
v$sesstat S,v$statname N,v$session A
where 
n.statistic#=s.statistic# and
name='session pga memory'
and s.sid=a.sid
order by s.value;

13.等待最多的用户

SELECT   s.SID,s.username,v$session s
   WHERE a.sample_time BETWEEN SYSDATE - 30 / 2880 AND SYSDATE
GROUP BY s.SID,s.username
ORDER BY total_wait_time DESC;

14.等待最多的SQL

SELECT   a.program,a.user_id,d.username,s.sql_text,v$sqlarea s,dba_users d
   WHERE a.sample_time BETWEEN SYSDATE - 30 / 2880 AND SYSDATE
     AND a.sql_id = s.sql_id
     AND a.user_id = d.user_id
GROUP BY a.program,d.username;

15.查看消耗资源最多的SQL

SELECT hash_value,executions,buffer_gets,disk_reads,parse_calls
FROM V$SQLAREA
WHERE buffer_gets > 10000000 OR disk_reads > 1000000
ORDER BY buffer_gets + 100 * disk_reads DESC;

16.查看某条SQL语句的资源消耗

SELECT hash_value,parse_calls
FROM V$SQLAREA
WHERE hash_Value = 228801498 AND address = hextoraw('CBD8E4B0');

17.查询会话执行的实际SQL

SELECT   a.SID,a.username,s.sql_text
    FROM v$session a,v$sqltext s
   WHERE a.sql_address = s.address
     AND a.sql_hash_value = s.hash_value
     AND a.status = 'ACTIVE'
ORDER BY a.username,s.piece;

18.显示正在等待锁的所有会话

SELECT * FROM DBA_WAITERS;

（编辑：李大同）

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