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PL/SQL: unhandled user-defined exception
Cause: A user-defined exception was raised by PL/SQL code, but not handled.
Action: Fix the problem causing the exception or write an exception handler for this condition. Or you may need to contact your application administrator or DBA.
1.Session PGA memory max exceeded 2 GB and crashes.4
2.lock held by in-doubt distributed transaction1 can you protect read-only indexes?1