Oracle包被鎖定的原因分析及解決方案
阿新 • • 發佈:2019-02-10
死鎖是資料庫經常發生的問題,資料庫一般不會無緣無故產生死鎖,死鎖通常都是由於我們應用程式的設計本身造成的。產生死鎖時,如何解決呢,下面是常規的解決辦法:
1)執行下面SQL,先檢視哪些表被鎖住了:
select b.owner,b.object_name,a.session_id,a.locked_mode
from v$locked_object a,dba_objects b
where b.object_id = a.object_id;
2)查處引起死鎖的會話
select b.username,b.sid,b.serial#,logon_time
from v$locked_object a,v$session b
where a.session_id = b.sid order by b.logon_time;
這裡會列出SID
3) 查出SID和SERIAL#:
查V$SESSION檢視:
SELECT SID,SERIAL#,PADDR FROM V$SESSION WHERE SID='剛才查到的SID';
這一步將得到PADDR
4)查V$PROCESS檢視:
SELECT SPID FROM V$PROCESS WHERE ADDR='剛才查到的PADDR';
這一步得到SPID
5)殺死程序
(1)在資料庫中,殺掉ORACLE程序:
ALTER SYSTEM KILL SESSION '查出的SID,查出的SERIAL#';
執行儲存過程更新一個表中的資料的時候產生如下的錯誤:
SQL> exec update_jc_kxx_yxrq;
begin update_jc_kxx_yxrq; end;
ORA-20998: Err=-2049,Msg=0-ORA-02049: 超時: 分散式事務處理等待鎖定
ORA-06512: 在"ICUSER.UPDATE_JC_KXX_YXRQ", line 36
ORA-06512: 在line 2
以sys使用者登陸資料庫查詢死鎖
SQL> select username,lockwait,status,machine,program from v$session where sid in
(select session_id from v$locked_object);
USERNAME LOCKWAIT STATUS
------------------------------ ---------------- --------
MACHINE
----------------------------------------------------------------
PROGRAM
------------------------------------------------
icdb
JDBC Thin Client
ICUSER 000000038A37C0C8 ACTIVE
icdb
JDBC Thin Client
說明資料庫有死鎖
然後使用一下語句查詢被死鎖的語句
SQL> select sql_text from v$sql where hash_value in
(select sql_hash_value from v$session where sid in
(select session_id from v$locked_object));
SQL_TEXT
--------------------------------------------------------------------------------
update JC_KXX SET LJXF =NVL ( LJXF , 0 ) + :1 , YE =:2 WHERE KH =:3
update jc_kxx set zt='07' where kh='1000530330'
再使用以下語句查詢被死鎖的程序
SQL> SELECT s.username,l.OBJECT_ID,l.SESSION_ID,s.SERIAL#,
l.ORACLE_USERNAME,l.OS_USER_NAME,l.PROCESS
FROM V$LOCKED_OBJECT l,V$SESSION S WHERE l.SESSION_ID=S.SID;
USERNAME OBJECT_ID SESSION_ID SERIAL#
------------------------------ ---------- ---------- ----------
ORACLE_USERNAME OS_USER_NAME PROCESS
------------------------------ ------------------------------ ------------
ICUSER 30523 32 42463
ICUSER oracle
ICUSER 30523 28 25508
ICUSER oracle
ICUSER 30523 76 14781
ICUSER oracle
USERNAME OBJECT_ID SESSION_ID SERIAL#
------------------------------ ---------- ---------- ----------
ORACLE_USERNAME OS_USER_NAME PROCESS
------------------------------ ------------------------------ ------------
ICUSER 30523 24 37522
ICUSER oracle
使用一下語句把死鎖的程序kill
alter system kill session ‘sid,serial#’; (其中sid=l.session_id)
如:SQL> alter system kill session '24,37522';
再次執行儲存過程,錯誤沒有了。語句執行成功!
1)執行下面SQL,先檢視哪些表被鎖住了:
select b.owner,b.object_name,a.session_id,a.locked_mode
from v$locked_object a,dba_objects b
where b.object_id = a.object_id;
2)查處引起死鎖的會話
select b.username,b.sid,b.serial#,logon_time
from v$locked_object a,v$session b
where a.session_id = b.sid order by b.logon_time;
這裡會列出SID
3) 查出SID和SERIAL#:
查V$SESSION檢視:
SELECT SID,SERIAL#,PADDR FROM V$SESSION WHERE SID='剛才查到的SID';
這一步將得到PADDR
4)查V$PROCESS檢視:
SELECT SPID FROM V$PROCESS WHERE ADDR='剛才查到的PADDR';
這一步得到SPID
5)殺死程序
(1)在資料庫中,殺掉ORACLE程序:
ALTER SYSTEM KILL SESSION '查出的SID,查出的SERIAL#';
執行儲存過程更新一個表中的資料的時候產生如下的錯誤:
SQL> exec update_jc_kxx_yxrq;
begin update_jc_kxx_yxrq; end;
ORA-20998: Err=-2049,Msg=0-ORA-02049: 超時: 分散式事務處理等待鎖定
ORA-06512: 在"ICUSER.UPDATE_JC_KXX_YXRQ", line 36
ORA-06512: 在line 2
以sys使用者登陸資料庫查詢死鎖
SQL> select username,lockwait,status,machine,program from v$session where sid in
(select session_id from v$locked_object);
USERNAME LOCKWAIT STATUS
------------------------------ ---------------- --------
MACHINE
----------------------------------------------------------------
PROGRAM
------------------------------------------------
icdb
JDBC Thin Client
ICUSER 000000038A37C0C8 ACTIVE
icdb
JDBC Thin Client
說明資料庫有死鎖
然後使用一下語句查詢被死鎖的語句
SQL> select sql_text from v$sql where hash_value in
(select sql_hash_value from v$session where sid in
(select session_id from v$locked_object));
SQL_TEXT
--------------------------------------------------------------------------------
update JC_KXX SET LJXF =NVL ( LJXF , 0 ) + :1 , YE =:2 WHERE KH =:3
update jc_kxx set zt='07' where kh='1000530330'
再使用以下語句查詢被死鎖的程序
SQL> SELECT s.username,l.OBJECT_ID,l.SESSION_ID,s.SERIAL#,
l.ORACLE_USERNAME,l.OS_USER_NAME,l.PROCESS
FROM V$LOCKED_OBJECT l,V$SESSION S WHERE l.SESSION_ID=S.SID;
USERNAME OBJECT_ID SESSION_ID SERIAL#
------------------------------ ---------- ---------- ----------
ORACLE_USERNAME OS_USER_NAME PROCESS
------------------------------ ------------------------------ ------------
ICUSER 30523 32 42463
ICUSER oracle
ICUSER 30523 28 25508
ICUSER oracle
ICUSER 30523 76 14781
ICUSER oracle
USERNAME OBJECT_ID SESSION_ID SERIAL#
------------------------------ ---------- ---------- ----------
ORACLE_USERNAME OS_USER_NAME PROCESS
------------------------------ ------------------------------ ------------
ICUSER 30523 24 37522
ICUSER oracle
使用一下語句把死鎖的程序kill
alter system kill session ‘sid,serial#’; (其中sid=l.session_id)
如:SQL> alter system kill session '24,37522';
再次執行儲存過程,錯誤沒有了。語句執行成功!