ORA-12839: cannot modify an object in parallel after modifying it
Cause: Within the same transaction, an attempt was made to perform parallel modification operations on a table after it had been modified. This is not permitted.
Action: Rewrite the transaction or break it up into two transactions: one containing the parallel modification and the second containing the initial modification operation.
ORA-12840: cannot access a remote table after parallel/insert direct load txn
Cause: Within a transaction, an attempt was made to perform distributed access after a PDML or insert direct statement had been issued.
Action: Commit/rollback the PDML transaction first, and then perform the distributed access, or perform the distributed access before the first PDML statement in the transaction.
ORA-12841: Cannot alter the session parallel DML state within a transaction
Cause: Transaction in progress
Action: Commit or rollback transaction and then re-execute
ORA-12842: Cursor invalidated during parallel execution
Cause: The cursor was invalidated during the parse phase of deferred parallel processing, e.g. when set operands are parallelized.
Action: Depends on why the cursor was invalidated. Possible causes include DDL on a schema object and shared pool being flushed.
ORA-12843: pdml lock not held properly on the table
Cause: The coodinator crashed or released the lock on the partition which the slave is trying to aquire currently.
Action: Check if the coordinator or some of the other slaves died. Also check that the lock has not been corrupted. Issue the pdml again.
ORA-12844: cluster reconfiguration in progress
Cause: Internal error
Action: THIS IS NOT A USER ERROR NUMBER/MESSAGE. THIS DOES NOT NEED TO BE TRANSLATED OR DOCUMENTED. IT IS USED ONLY FOR INTERNAL ERROR.
ORA-12845: failed to receive interinstance parallel execution message
Cause: OS or interconnect problem receiving interinstance message
Action: Check OS specific diagnostics
ORA-12850: Could not allocate slaves on all specified instances: string needed, string allocated
Cause: When executing a query on a gv$ fixed view, one or more instances failed to allocate a slave to process query.
Action: Check trace output for instances on which slaves failed to start. GV$ query can only proceed if slaves can be allocated on all instances.
ORA-12851: PARALLEL_MAX_SERVERS must be greater than or equal to PARALLEL_MIN_SERVERS, string
Cause: An attempt was made to set the PARALLEL_MAX_SERVERS parameter to a value less than PARALLEL_MIN_SERVERS.
Action: Set PARALLEL_MAX_SERVERS to a value greater than or equal to PARALLEL_MIN_SERVERS value specified in the accompanying message and retry.
ORA-12852: PARALLEL_MIN_SERVERS must be less than PROCESSES, string
Cause: An attempt was made to set the PARALLEL_MIN_SERVERS parameter to a value higher than PROCESSES.
Action: Set PARALLEL_MIN_SERVERS to a value less than PROCESSES value specified in the accompanying message and retry.
Above are list of Oracle Database Errors or Warnings from Error ORA-12839 to ORA-12852 received while performing certain operation against Oracle Database or related products.
What are Oracle Database Error Messages?
Oracle Error Messages may be returned while using products which are part of Oracle Database. Each Oracle Database Error or Warning Message mentioned above contains the Warning or Error Message Statement, a short explanation of the probable causes of the Error message, and a recommended action.
Hope this was helpful.
Information about Oracle Database Error Messages or Warning Messages on Windows and Linux Operating Systems.