ORACLE关于锁表查询的部分SQL

http://www.cnblogs.com/quanweiru/archive/2012/08/28/2660700.html

--查询表空间名称和大小

 

  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 4 DESC;

 

 

 

 

--查看数据库引起锁表的SQL语句：

 

  SELECT A.USERNAME,

         A.MACHINE,

         A.PROGRAM,

         A.SID,

         A.SERIAL#,

         A.STATUS,

         C.PIECE,

         C.SQL_TEXT

    FROM V$SESSION A,

         V$SQLTEXT C

   WHERE     A.SID IN (SELECT DISTINCT T2.SID

                         FROM V$LOCKED_OBJECT T1,

                              V$SESSION T2

                        WHERE T1.SESSION_ID = T2.SID)

         AND A.SQL_ADDRESS = C.ADDRESS(+)

ORDER BY C.PIECE;

 

 

--查看数据库锁的情况必须要有DBA权限，可以使用一下SQL 语句：

 

 

SELECT object_id, session_id, locked_mode FROM v$locked_object;

 

  SELECT t2.username,

         t2.sid,

         t2.serial#,

         t2.logon_time

    FROM v$locked_object t1, v$session t2

   WHERE t1.session_id = t2.sid

ORDER BY t2.logon_time;

 

 

--查看被锁的表

SELECT P.SPID,
A.SERIAL#,
C.OBJECT_NAME,
B.SESSION_ID,
B.ORACLE_USERNAME,
B.OS_USER_NAME
FROM V$PROCESS P,
V$SESSION A,
V$LOCKED_OBJECT B,
ALL_OBJECTS C
WHERE P.ADDR = A.PADDR
AND A.PROCESS = B.PROCESS
AND C.OBJECT_ID = B.OBJECT_ID;

      

--杀掉进程

ALTER SYSTEM KILL SESSION 'sid,serial#';

 

--查看连接数

SELECT COUNT (*) FROM v$session;

 

--查看并发连接数

SELECT COUNT(*) FROM V$SESSION WHERE STATUS='ACTIVE';

 

--查看连接的进程

SELECT SID, SERIAL#, USERNAME, OSUSER FROM V$SESSION;

 

--查看数据库使用的裸设备

  SELECT *

    FROM dba_data_files

ORDER BY file_name;

 

  SELECT *

    FROM dba_temp_files

ORDER BY file_name;

 

  SELECT *

    FROM v$controlfile

ORDER BY file_name;

 

  SELECT *

    FROM v$logfile;

 

--具体的方法是查询dba_data_files，dba_temp_files，v$controlfile和v$logfile看这四类文件具体占用的裸设备

 

--查询所有用户表使用大小的前三十名

select * from (select segment_name,bytes from dba_segments where owner = USER order by bytes desc ) where rownum <= 30;

 

--以下的SQL语句列出当前数据库建立的会话情况:

select sid,serial#,username,program,machine,status from v$session;

 

--如果DBA要手工断开某个会话，则执行:

alter system kill session 'SID,SERIAL#';

--注意，上例中SID为1到7(USERNAME列为空)的会话，是Oracle的后台进程，不要对这些会话进行任何操作。

 

--查询表空间有那些表:

select table_name from all_tables where tablespace_name= 'TEMP';