Trace 里没有详细的信息，无法判断。

你从 awr 里生成个报告分析一下，同时生成最后的时点ash报告。应该能看出问题。

盖老师 您好：我们数据库是standard版的 没办法收集awr日志。

According to alert log, Sat May 16 12:01:18 PMON failed to acquire latch. 
 According to the PMON trace, PMON appears to be blocked by orapid=517 ospid=38298, 
and blocker session appears to be doing heap allocation during PARSE phase. 
And blocker process 38298 disappeared after May 16 10:59:57, and no information 
dump in systemstate trace file. No error happen around May 16 10:59:57 in alert log.

Action Plan 1 
------------------------------------------------------------

1. Please confirm if there is any session killing around May 16 11:00.

2. If possible, collect systemstate dump trac earlier when reoccurring next time.

For possible reason, the parsing session was terminated abnormally, and its share pool 
latch holden did not be released properly, and caused PMON process cannot acquire 
the latch. So it seems to be session cleanup problem. Based on this symptom, I found 
following bug, that may cause dead session not being cleanup properly.

Action Plan 2 
------------------------------------------------------------ 
1.If possible, please consider to apply patch of Bug 24739928 that may help to avoid this problem.

2.If session was killed, please avoid to kill session in future.

[Reference] 
Bug 24739928 - ORA-7445 [kglMutexCleanupAll] with fix for Bug 13542050 ( Doc ID 24739928.8 )