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Saturday 17 September 2016

ORA-04091: table is mutating trigger

ORA-04091: table string.string is mutating, trigger/function may not see it
Cause: 
A trigger (or a user defined plsql function that is referenced in this statement) attempted to look at (or modify) a table that was in the middle of being modified by the statement which fired it.

Action:
 
Rewrite the trigger (or function) so it does not read that table.
You can try pragma function in declartion part - pragma autonomous_transaction

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