latch row cache objects 等待事件 说明

Row Cache Objects:

The row cache objects latch contention usually means there is contention in the data dictionary. This problem may also be a symptom of excessive parsing of SQL statements that depend on public synonyms. Increasing the shared pool usually solves this latch problem.

You usually increase the shared pool for a library cache latch problem well before this one is a problem.

根据上面的这段蚊子说明， 增大shared pool 通常可以解决这种latch 问题。 不过具体情况还是需要具体对待，可以做HANGANALYZE和SYSTEM STATE DUMP来帮助定位为题。 参考：

Oracle oradebug 命令 使用说明

http://blog.csdn.net/tianlesoftware/archive/2011/06/04/6525628.aspx

Oracle HANGANALYZE 功能诊断 DB hanging

http://blog.csdn.net/tianlesoftware/archive/2011/04/13/6321961.aspx

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