什么时候Instance Recovery是必须的？

unix培训http://www.cuug.com/我们无法禁止Instance Recovery的发生，事实上一旦出现Instance Crash那么Instance Recovery就是必须的。

与Instance Recovery相关的诊断事件主要有10426和29717等:
10426 - Reconfiguration trace event
10425 - Enqueue operations
10432 - Fusion activity
10429 - IPC tracing

oerr ora 10425
10425, 00000, "enable global enqueue operations event trace"
// *Document: NO
// *Cause:
// *Action: Dump trace for global enqueue operations.

oerr ora 10426
10426, 00000, "enable ges/gcs reconfiguration event trace"
// *Document: NO
// *Cause:
// *Action: Dump trace for ges/gcs reconfiguration.

oerr ora 10430
10430, 00000, "enable ges/gcs dynamic remastering event trace"
// *Document: NO
// *Cause:
// *Action: Dump trace for ges/gcs dynamic remastering.

oerr ora 10401
10401, 00000, "turn on IPC (ksxp) debugging"
// *Cause:
// *Action: Enables debugging code for IPC service layer (ksxp)

oerr ora 10708
10708, 00000, "print out trace information from the RAC buffer cache"
// *Cause: N/A
// *Action: THIS IS NOT A USER ERROR NUMBER/MESSAGE. THIS DOES NOT NEED TO BE
// TRANSLATED OR DOCUMENTED. IT IS USED ONLY FOR DEBUGGING.

oerr ora 29717
29717, 00000, "enable global resource directory freeze/unfreeze event trace"
// *Document: NO
// *Cause:
// *Action: Dump trace for global resource directory freeze/unfreeze.

diag RAC INSTANCE SHUTDOWN LMON
LMON will dump more informations to trace during reconfig and freeze.

event="10426 trace name context forever, level 8"
event="29717 trace name context forever, level 5"
or
event="10426 trace name context forever, level 12"
event="10430 trace name context forever, level 12"
event="10401 trace name context forever, level 8"
event="10046 trace name context forever, level 8"
event="10708 trace name context forever, level 15"
event="29717 trace name context forever, level 5"

see 29717 grd frozen trace

alter system set event='29717 trace name context forever, level 5' scope=spfile;

=========================================================================
============================lmon trace begin=============================