Oracle DB: Deadlocks - How to Solve

原创痛定思痛。 2025-01-02 05:09 6阅读 0赞

Deadlocks in Oracle Database occur when two or more threads, processes, or database sessions are waiting for each other to release resources. To solve deadlocks in Oracle, follow these steps:

1. **Identify the deadlock**: Use the `DBMS_DEBUG` package or a third-party tool like `ptlock` (part of SQL*Plus) to analyze the deadlock.

2. **Trace the threads**: The tracing will show you the sequence and resource waits that led to the deadlock.

3. **Understand the involved objects**: Identify the database objects involved in the deadlock, such as tables, indexes, cursors, or transaction locks.

4. **Resolve the deadlock**: Once you understand the deadlock, you can resolve it by:

- Releasing resources: If a session is holding on to a resource that's causing the deadlock, release it.

- Closing transactions: Check if any of the involved transactions are still active. If so, commit or rollback them.

- Modifying database objects: Adjust table partitioning, index placement, or transaction isolation levels to avoid deadlocks.

5. **Monitor and prevent future deadlocks**: After resolving the current deadlock, monitor your database for any signs of further deadlocks. Implement best practices, such as using serializable transactions and avoiding resource contention.

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