Cause: The directory server is under a heavy read and write load, and an update request is processed.
Consequence: An error message appears in the errors log: "entryrdn-index - _entryrdn_put_data: Adding the
parent link (XXX) failed: DB_LOCK_DEADLOCK: Locker killed to resolve a
deadlock (-30994)". Or other similar DB_LOCK_DEADLOCK error messages.
Fix: Deadlocks are quite normal under concurrent write loads. The fix is to ensure deadlocks are handled properly (by retrying the transaction) and not to log these messages since they are not errors.
Result: Directory Server can sustain a heavy write load without logging deadlock messages to the errors log.