Oracle查询表空间使用情况

 --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,ctimeFROM GV$LOCKWHERE (id1, id2, type) IN       (SELECT id1, id2, type FROM GV$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_idGROUP BY o.OWNER,o.object_name, o.object_type, a.eventORDER 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.SIDGROUP BY o.owner,         o.object_name,         o.object_type,         a.event,         a.session_id,         s.program,         s.machine,         s.osuserORDER BY total_wait_time DESC;

8.查询当前连接会话数select s.value,s.sid,a.usernamefrom v$sesstat S,v$statname N,v$session Awhere n.statistic#=s.statistic# andname='session pga memory'and s.sid=a.sidorder 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 SYSDATEGROUP BY s.SID, s.usernameORDER BY total_wait_time DESC;

10.等待最多的SQLSELECT   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_idGROUP BY a.program, a.session_id, a.user_id, s.sql_text, d.username;

11.查看消耗资源最多的SQLSELECT hash_value, executions, buffer_gets, disk_reads, parse_callsFROM V$SQLAREAWHERE buffer_gets > 10000000 OR disk_reads > 1000000ORDER 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_callsFROM V$SQLAREAWHERE hash_Value = 228801498 AND address = hextoraw('CBD8E4B0');

13.查询会话执行的实际SQLSELECT   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;

原文转载:http://www.cnblogs.com/askjacklin/archive/2012/06/04/2534571.html

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