Oracle 网上一些实用脚本归纳

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.SIDFROM v$lock a, v$lock bWHERE 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_timeFROM v$active_session_history a, dba_objects oWHERE 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_timeFROM v$active_session_history a, dba_objects o, v$session sWHERE 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#     and name='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_timeFROM v$active_session_history a, v$session sWHERE 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SQL

SELECT a.program,         a.session_id,         a.user_id,         d.username,         s.sql_text,        SUM (a.wait_time + a.time_waited) total_wait_timeFROM v$active_session_history a, v$sqlarea s, dba_users dWHERE 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SQL

SELECT 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SQL

SELECT a.SID,        a.username,        s.sql_textFROM v$session a, v$sqltext sWHERE 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;

15 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) DWHERE D.TABLESPACE_NAME = F.TABLESPACE_NAMEORDER BY 1;

16 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 blocksfrom dba_free_spacegroup by tablespace_name;

17 查询表空间的总容量

select tablespace_name, sum(bytes) / 1024 / 1024 as MBfrom dba_data_filesgroup by tablespace_name;

18 查询表空间使用率

select total.tablespace_name,　　round(total.MB, 2) as Total_MB,　　round(total.MB - free.MB, 2) as Used_MB,　　round((1 - free.MB / total.MB) * 100, 2) || '%' as Used_Pctfrom (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) totalwhere free.tablespace_name = total.tablespace_name;

19 查询数据库最大连接数

select value from v$parameter where name = 'processes';