ORA Error Codes

Columns in partially dropped state. Submit ALTER TABLE DROP COLUMNS CONTINUE

Cannot access a remote table after parallel/insert direct load txn

Default degree of parallelism may not be specified here

Cannot alter the session parallel DML state within a transaction

INSTANCES DEFAULT may not be specified here

Schema modified during parallel execution

Explicit degree of parallelism must be specified here

Pdml lock not held properly on the table

Hung parallel query server was killed

Insufficient parallel query slaves available