常用脚本

1：查询被锁住的对象

 

select b.owner, b.object_name, l.session_id, l.locked_mode
  from v$locked_object l, dba_objects b
 where b.object_id = l.object_id

locked_mode的含义： 

0：none 

1：null 空 
2：Row-S 行共享(RS)：共享表锁，sub share  
3：Row-X 行独占(RX)：用于行的修改，sub exclusive  
4：Share 共享锁(S)：阻止其他DML操作，share 
5：S/Row-X 共享行独占(SRX)：阻止其他事务操作，share/sub exclusive  
6：exclusive 独占(X)：独立访问使用，exclusive 

 

2：查询登陆用户的sid

 

select sid from v$mystat where rownum=1

 

 

3：查询逻辑读最多的sql，按时间倒序排序

 

select s.SQL_FULLTEXT,
       s.SQL_ID,
       s.LAST_LOAD_TIME,
       s.BUFFER_GETS / decode(s.EXECUTIONS, 0, 1, s.EXECUTIONS) buffer_get
  from v$sql s
 order by buffer_get desc, s.LAST_LOAD_TIME desc

 

4：在sqlplus中统计执行信息

 

alter session set statistics_level=all

 

 

5:dbms_stats收集和删除统计信息

 

EXEC DBMS_STATS.gather_database_stats;
EXEC DBMS_STATS.gather_database_stats(estimate_percent => 15);

EXEC DBMS_STATS.gather_schema_stats('SCOTT');
EXEC DBMS_STATS.gather_schema_stats('SCOTT', estimate_percent => 15);

EXEC DBMS_STATS.gather_table_stats('SCOTT', 'EMPLOYEES');
EXEC DBMS_STATS.gather_table_stats('SCOTT', 'EMPLOYEES', estimate_percent => 15);

EXEC DBMS_STATS.gather_index_stats('SCOTT', 'EMPLOYEES_PK');
EXEC DBMS_STATS.gather_index_stats('SCOTT', 'EMPLOYEES_PK', estimate_percent => 15);

EXEC DBMS_STATS.delete_database_stats;
EXEC DBMS_STATS.delete_schema_stats('SCOTT');
EXEC DBMS_STATS.delete_table_stats('SCOTT', 'EMPLOYEES');
EXEC DBMS_STATS.delete_index_stats('SCOTT', 'EMPLOYEES_PK');

 

 

6:查询绑定变量的值

 

select b.SQL_ID, b.CHILD_NUMBER, b.name, b.VALUE_STRING
  from V$SQL_BIND_CAPTURE b

 

 

7:查询share pool中sql语句占用了多少内存

 

select trunc(sum(sharable_mem)/1024/1024) ||'M' from v$sql 

 

 

8：查询sga中各组件占用内存大小

 

select name,bytes/1024/1024 from v$sgainfo

 

 

9：查询整个系统中sql解析的情况

 

select * from v$sysstat where name like '%parse%'

 

 

10：查询shared pool情况

 

SELECT   pool, NAME, TRUNC (BYTES / 1024 / 1024) bsize
    FROM v$sgastat
   WHERE pool = 'shared pool'
ORDER BY bsize DESC

 

 

11:查询shared pool实际占用内存情况

 

SELECT   sum (BYTES / 1024 / 1024)
    FROM v$sgastat
   WHERE pool = 'shared pool' and name !='free memory'

 

 

12：查询V$SQL_PLAN中的执行计划

 

SELECT ID,
       LPAD(' ', DEPTH) || OPERATION OPERATION,
       OPTIONS,
       OBJECT_NAME,
       OPTIMIZER,
       COST
  FROM V$SQL_PLAN
 WHERE SQL_ID = '7hzv19tjg807d'
 START WITH ID = 0
CONNECT BY (PRIOR ID = PARENT_ID AND PRIOR HASH_VALUE = HASH_VALUE AND
           PRIOR CHILD_NUMBER = CHILD_NUMBER)
 ORDER SIBLINGS BY ID, POSITION;

 

 

13:获取触发器脚本

 

select dbms_metadata.get_ddl('TRIGGER', 'TRG_DEL_T1') from user_triggers u;

  或者

 

select dbms_metadata.get_ddl('TRIGGER', 'TRG_DEL_T1') from dual;

 

 

14：导出awr报告

 

@?/rdbms/admin/awrrpt

 

 

15:查询awr采样时间

 

SELECT * FROM Dba_Hist_Wr_Control;

 

 

16:修改awr采样时间，单位是分钟

 

BEGIN
  DBMS_WORKLOAD_REPOSITORY.MODIFY_SNAPSHOT_SETTINGS(INTERVAL => 10);
END;

 

 

17:查询临时表空间使用情况，收缩临时表空间文件

 

select name,bytes/1024/1024/1024 from v$tempfile;

查询临时表空间大小

select max(segblk#)*8192/1024/1024/1024  from v$tempseg_usage;

把临时表空间文件收缩到10G
alter database tempfile 'E:\oracle\product\10.2.0\oradata\dev\TEMP01.dbf' resize 10G;

查询临时表空间使用信息
select * from   from v$tempseg_usage;

 

 

18:启动，禁用触发器,查询触发器状态

 

ALTER  TRIGGER  trg_add_gw DISABLE;

ALTER  TRIGGER  trg_add_gw ENABLE;

SELECT T.OWNER,
       T.TRIGGER_NAME,
       T.STATUS
  FROM DBA_TRIGGERS T
 WHERE T.OWNER = 'CARMOT_TRIGGER';

 

 

19:对用户所占用的空间进行倒序排序

 

SELECT OWNER,
       ROUND(SUM(BYTES) / 1024 / 1024, 2) "USED / M"
  FROM DBA_SEGMENTS
 GROUP BY OWNER
 ORDER BY SUM(BYTES) DESC;

 

20：对某个用户所拥有的段进行倒序排序

 

SELECT OWNER,
       SEGMENT_NAME,
       BYTES / 1024 / 1024
  FROM DBA_SEGMENTS
 WHERE OWNER = 'CARMOT_GG_1'
 ORDER BY BYTES DESC;

 

 

21：杀掉锁住对象的session

 

SELECT OBJECT_NAME AS 对象名称,
       S.SID,
       S.SERIAL#,
       P.SPID      AS 系统进程号
  FROM V$LOCKED_OBJECT L,
       DBA_OBJECTS     O,
       V$SESSION       S,
       V$PROCESS       P
 WHERE L.OBJECT_ID = O.OBJECT_ID AND
       L.SESSION_ID = S.SID AND
       S.PADDR = P.ADDR;

 alter system kill session 'sid,serial#';

 

 

22：使用hints

 

SELECT /*+ FULL(u) FULL(e) */
 *
  FROM TBUSER U, TBENTITY E
 WHERE U.CURRENTENTITYID = E.ENTITYID
   AND U.USERID = 1;

 

 

23：跟踪sql用到的一些参数

 

alter session set timed_statistics = true;
alter session set statistics_level=ALL;
alter session set max_dump_file_size=UNLIMITED;
ALTER SESSION SET TRACEFILE_IDENTIFIER= 'TUNE';

 

 

24：回收站

SELECT * from user_recyclebin;

purge user_recyclebin;

 

 

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