Chains most likely to have caused the hang: [a] Chain 1 Signature: 'enq: TT - contention'<='row cache lock' (cycle) Chain 1 Signature Hash: 0x4a0d0d64 [b] Chain 2 Signature: 'row cache lock'<='row cache lock' (cycle) Chain 2 Signature Hash: 0x75bdd0c [c] Chain 3 Signatur...
HOOKS "WAITEVENT:row cache lock" STACKHAS:jskaObjGet WAITEVENT:row cache lock STACKHAS:jskaObjGet LIKELYAFFECTS XAFFECTS_11.2.0.1 XAFFECTS_V11020001 AFFECTS=11.2.0.1 XAFFECTS_11.2.0.2 XAFFECTS_V11020002 AFFECTS=11.2.0.2 XAFFECTS_11.2.0.3 XAFFECTS_V11020003 AFFECTS=11.2.0.3 XAFFECTS_11.2.0...
以下为hanganalyze的截取输出,可以看到主要等待为row cache lock,session id:7/porcess id:128被session id:1209/process id: 49锁住,和上面的分析一致。 Chains most likely to have caused the hang: [a] Chain 1 Signature: 'rdbms ipc message'<='row cache lock' Chain 1 Signature Hash: 0xfe4c0898 ...
异常状态:通过查看ash,有很多row cache lock等待。排查trace日志未发现异常。 通过排查ash,主要是由以下系统级的sql引起。 select/*jskqjobqlod2*//*+ no_monitor no_statement_queuing current_instance*/nvl(con_id,0) CON_ID, obj# OBJOID, class_oid CLSOID, run_time RUNTIME,2*priority+decode(bitand...
Oracle Row cache lock图解 Oracle Row cache lock(dictionary cache)图解
1. event: 'row cache lock' wait id: 310 p1: 'cache id'=0x7 time waited: 2.929713 sec p2: 'mode'=0x0 p3: 'request'=0x5 2. event: 'row cache lock' wait id: 309 p1: 'cache id'=0x7 time waited: 2.929726 sec p2: 'mode'=0x0 ...
oracle row cache lock 之sequence 1 查询当时P1的情况 select INSTANCE_NUMBER,p1,count(*) cnt from dba_hist_active_sess_history where event=‘row cache lock’ and SAMPLE_TIME>=to_date(‘2018-08-31 10:00:00’,‘yyyy-mm-dd hh24:mi:ss’) and SAMPLE_TIME <=to_date(‘2018-08-31 10:...
这个library cache lock事件简单来说: Oracle利用Library cache lock和Library cache pin来实现并发控制,Library cache lock是在handle上获取的,而Library cache pin则是在data heap上获取。访问对象时,首先必须获取handle上的lock,简而言之,就是个对象锁
排他锁(exclusive lock,即X锁)和共享锁(share lock,即S锁) 排他锁(exclusive lock,即X锁) 事务设置排它锁后,该事务单独获得此资源,另一事务不能在此事务提交之前获得相同对象的共享锁或排它锁。 共享锁(share lock,即S锁) 共享锁使一个事务对特定数据库资源进行共享访问——另一事务也可对此资源进行访问或...
这个library cache lock事件简单来说: Oracle利用Library cache lock和Library cache pin来实现并发控制,Library cache lock是在handle上获取的,而Library cache pin则是在data heap上获取。访问对象时,首先必须获取handle上的lock,简而言之,就是个对象锁