ORACLE系列腳本1：救命的應急會話處理腳本

背景：數(shù)據(jù)庫出現(xiàn)死鎖會話飆升的情況通過下列預計可以快速定位常見的鎖，快速干預處理，恢復數(shù)據(jù)庫性能。通過下列語句長期運維?T以上數(shù)據(jù)庫?個，屢試不爽。

一、查詢出死鎖的SID等信息
SELECT l.session_id sid,s.serial#,l.locked_mode,l.oracle_username,l.os_user_name,
s.machine,s.terminal,o.object_name,s.logon_time
FROM v$locked_object l, all_objects o, v$session s
WHERE l.object_id = o.object_id AND l.session_id = s.sid
ORDER BY sid, s.serial#;

二、根據(jù)SID定位阻塞語句
SELECT /+ PUSH_SUBQ /
Command_Type, Sql_Text, Sharable_Mem, Persistent_Mem, Runtime_Mem, Sorts,Version_Count, Loaded_Versions, Open_Versions, Users_Opening, Executions,Users_Executing, Loads, First_Load_Time, Invalidations, Parse_Calls,Disk_Reads, Buffer_Gets, Rows_Processed, SYSDATE Start_Time,
SYSDATE Finish_Time, '>' || Address Sql_Address, 'N' Status
FROM V$sqlarea
WHERE Address = (SELECT Sql_Address FROM V$session WHERE Sid = ？ );

三、殺死鎖
--殺死鎖（數(shù)據(jù)庫層次--適合不太緊急場合）
select 'alter system kill session '||chr(39)||t2.sid||','||t2.serial#||chr(39)||'immediate;'
from v$locked_object t1,v$session t2
where t1.session_id=t2.sid order by t2.logon_time

--殺死鎖（操作系統(tǒng)層次--適合緊急場合）
select 'kill -9 '||t3.spid
from v$locked_object t1,v$session t2 , v$process t3
where t1.session_id=t2.sid And t2.paddr = t3.addr order by t2.logon_time

附日常會話查詢語句：
--所有會話信息
Select From v$session
Select Count() From v$session
--會話關鍵信息
Select USERNAME,status,state,MACHINE,logon_time From V$SESSION Order By username,MACHINE