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Resolving the ORA-00051: Time-out Occurred While Waiting for Resource Error

Database errors can be a major roadblock when it comes to maintaining efficient and effective data management systems. The Oracle Database, a widely used and reliable database system, is no exception. One such error that Oracle Database administrators might encounter is the ORA-00051: Time-out occurred while waiting for a resource error. In this article, we will explore the root causes of this error, its implications, and the steps you can take to resolve it.

Understanding the ORA-00051 Error

The ORA-00051 error occurs when a database session times out while waiting for a resource to become available. This resource could be a lock, a latch, or another resource required for the requested operation. The time-out can happen for a variety of reasons, such as heavy system load, inefficient query execution, or resource contention.

Implications of the ORA-00051 Error

When the ORA-00051 error occurs, it can cause performance degradation and increased wait times for users. It may also cause the affected transaction to roll back, which can result in data loss or inconsistencies. In addition, this error can impact overall database stability and make it difficult for administrators to manage the system effectively.

Strategies to Resolve the ORA-00051 Error

Resolving the ORA-00051 error requires identifying the underlying cause and implementing corrective measures. Here are some strategies to consider:

  1. Analyze system and session statistics: Start by examining the database’s performance metrics using tools like Automatic Workload Repository (AWR) and Active Session History (ASH) to identify any performance bottlenecks or contention issues.
  2. Identify blocking sessions: Use the Oracle Enterprise Manager or SQL queries to identify the sessions that hold locks or resources, which may be blocking other sessions. Once identified, you can decide to either wait for the blocking session to complete its operation or terminate it to release the resources.
  3. Optimize queries and transactions: Review the SQL statements involved in the timed-out transactions and optimize them for better performance. This could include rewriting queries, creating appropriate indexes, or using hints to guide the query optimizer.
  4. Adjust time-out settings: In some cases, you may need to increase the time-out duration for specific operations. You can do this by altering the INIT.ORA parameters like DISTRIBUTED_LOCK_TIMEOUT or adjusting the SESSION_WAIT_TIME parameter.
  5. Balance system resources: Ensure that your system is not overburdened with an excessive number of concurrent transactions or insufficient resources. You may need to adjust the system’s configuration, add more hardware resources, or redistribute the workload to resolve the issue.
  6. Implement database partitioning: If the error is due to contention on a specific table, consider implementing database partitioning. This divides the table into smaller, more manageable segments, reducing contention and improving performance.


The ORA-00051 error can pose significant challenges for Oracle Database administrators, impacting performance and user experience. Identifying the root cause of the error and implementing appropriate solutions are crucial to maintaining a stable and efficient database environment. By following the strategies outlined in this article, you can successfully resolve the ORA-00051 error and ensure the smooth operation of your Oracle Database

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