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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.

Before getting started, we highly recommend setting up Oracle database in your system to help you practice and learn PL/SQL effectively.

This book includes scripts and tools to hypercharge Oracle 11g performance and you can buy it for 30% off directly from the publisher.

If you are looking for a complete PL/SQL tutorial, you are at the right place.

SQL is a powerful language for both querying and updating data in relational databases.

Oracle created PL/SQL that extends some limitations of SQL to provide a more comprehensive solution for building mission-critical applications running on Oracle database.




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