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Don Burleson Blog 







ORA-01456: May Not Perform Operation Inside a READ ONLY Transaction Tips

Expert Oracle Database Tips by Donald BurlesonMarch 25, 2015


Question:  I am getting this error while full export for one table daily and export is terminated successfully with errors. No other table is giving this error.

EXP-00056: ORACLE error 604 encountered
ORA-00604: error occurred at recursive SQL level 2
ORA-01456: may not perform insert/delete/update operation inside a READ ONLY transaction
ORA-06512: at line 3

Individual export of the same table is fine, but a FULL export gives the ORA-01456 error.

What causes the ORA-01456 error in the export utility?

Answer:  The export utility is a read-only transaction.  This smells like a bug.  Check MOSC first, searching for ORA-01456 and export.

You start by using the oerr utility to see the content of the error:

ORA-01456: may not perform insert/delete/update operation inside a READ ONLY transaction

Cause: A non-DDL insert/delete/update or select for update operation was attempted

 Action: commit (or rollback) transaction, and re-execute

The question is why Oracle thinks that your export job is not a read-only transaction!

I would try this to resolve the ORA-01456 error:

  1.  Recompile any invalid objects in the database.

  2. Run the following as SYS to recompile all invalid objects in the dictionary:


  3. Check MOSC for known issues or bugs relating to the ORA-01456 error.

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