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There should be a trace file related to this forced disconnection in the udump dest on the server - there will normally be an underlying ORA-600 or ORA-7445 error the arguments of which you can use to find out more via the ORA-600/7445 lookup tool on [url http://support.oracle.com]Oracle Support.
ora-3113 is in the same category as ora-600 and ora-7445. Usually untrapped errors, quite often caused by memory allocation and nil pointer issues.
Generally speaking, you'd better conduct ora-3113 searches on My Oracle Support, if you have access to it.
It can be anything.
Typically ora-3113's are resolved by patches, 188.8.131.52 may be already out for your platform.
Senior Oracle DBA
I had a doubt related 2 memory,
total memory of the server is 12G,
what should be the shmmax value?...