Oracle表空间的使用情况查询

--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;

--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;

--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;

--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;

1.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;

2.杀掉锁表进程：

alter system kill session '436,35123';

3.RAC环境中锁查找：

SELECT inst_id,DECODE(request,0,'Holder: ','Waiter: ')||sid sess,

        id1, id2, lmode, request, type,block,ctime

FROM GV$LOCK

WHERE (id1, id2, type) IN

       (SELECT id1, id2, type FROM GV$LOCK WHERE request>0)

ORDER BY id1, request;

  

4.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;

 

5.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;

6.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;

7.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,o.object_name, o.object_type, a.event

ORDER BY total_wait_time DESC;

SELECT   a.session_id, s.osuser, s.machine, s.program, o.owner, o.object_name,

         o.object_type, a.event,

         SUM (a.wait_time + a.time_waited) total_wait_time

    FROM v$active_session_history a, dba_objects o, v$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,

         o.object_name,

         o.object_type,

         a.event,

         a.session_id,

         s.program,

         s.machine,

         s.osuser

ORDER BY total_wait_time DESC;

 

8.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;

 

9.等待最多的用户

SELECT   s.SID, s.username, SUM (a.wait_time + a.time_waited) total_wait_time

    FROM v$active_session_history a, v$session s

   WHERE a.sample_time BETWEEN SYSDATE - 30 / 2880 AND SYSDATE

GROUP BY s.SID, s.username

ORDER BY total_wait_time DESC;

 

10.等待最多的SQL

SELECT   a.program, a.session_id, a.user_id, d.username, s.sql_text,

         SUM (a.wait_time + a.time_waited) total_wait_time

    FROM v$active_session_history a, v$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, a.session_id, a.user_id, s.sql_text, d.username;

 

11.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;

 

12.查看某条SQL语句的资源消耗

SELECT hash_value, buffer_gets, disk_reads, executions, parse_calls

FROM V$SQLAREA

WHERE hash_Value = 228801498 AND address = hextoraw('CBD8E4B0');

13.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, a.SID, s.piece;

14.显示正在等待锁的所有会话

SELECT * FROM DBA_WAITERS;