librarycachelock的解决案例

下午，业务人员报告，执行任何和zzss03201281cs_no表有关的操作都会hang住，包括desczzss03201281cs_no，也会hang在那里

第一感觉是锁了，于是，我看看锁

SQL>select*fromv$lockwhereblock=1;

norowsselected

SQL>
SQL>select*fromgv$lockwhereblock=1;

norowsselected

SQL>

再看看等待事件：

SQL>coleventfora30
SQL>l
1*selectevent,p1,p2,sidfromv$session_waitwhereevent='librarycachelock'
SQL>/

EVENT P1 P2 SID
------------------------------------------------------------
librarycachelock 1.3835E+191.3835E+19 32

SQL>/

EVENT P1 P2 SID
------------------------------------------------------------
librarycachelock 1.3835E+191.3835E+19 32

SQL>/

EVENT P1 P2 SID
------------------------------------------------------------
librarycachelock 1.3835E+191.3835E+19 32

。。。

奇怪，怎么这么多librarycachelock ？

SQL>showuser
USERis"SYS"
SQL>execdbms_system.set_ev(32,27506,10046,12,'');

PL/SQLproceduresuccessfullycompleted.

Elapsed:00:00:00.10
SQL>l
1 SELECT d.VALUE
2 ||'/'
3 ||LOWER(RTRIM(i.INSTANCE,CHR(0)))
4 ||'_ora_'
5 ||p.spid
6 ||'.trc'trace_file_name
7 FROM(SELECTp.spid
8 FROMv$mystatm,v$sessions,v$processp
9 WHEREm.statistic#=1ANDs.SID=m.SIDANDp.addr=s.paddr)p,
10 (SELECTt.INSTANCE1