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To solve this particular instance, the session holding the lock must perform a COMMIT or ROLLBACK.

In mode 4, a TX wait can occur if there is a potential duplicate in a unique index.

Answer: The "enq: TX - row lock contention" event often indicates an application level locking problem. enq: TX - contention) and can also be related to buffer busy waits, in conditions where multiple transaction attempt to update the same data blocks.

TX enqueue is issued when a transaction makes its first change, and released when the transaction performs a COMMIT or ROLLBACK.

The wait event "enq: TX - row lock contention" corresponds to several situations of TX enqueue.

Waits for TX in mode 6 occur when a session is waiting for a row level lock that is already held by another session.

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