Ora-12801: error signaled in parallel query server

Ora-12801: error signaled in parallel query server

Welcome to our troubleshooting guide. In the world of databases, encountering the Ora-12801 error can be frustrating. This error is related to parallel query processing in Oracle databases. Our aim is to help you understand the root cause of this issue and provide solutions to resolve it efficiently. Let’s dive into the complexities of this Oracle error and work towards a quick resolution.

When encountering the Ora-12801: error signaled in parallel query server error in an Oracle database system, several potential causes may be responsible for its occurrence. Some of the common reasons for this error include:

• Incorrect parallelization settings that lead to conflicts within parallel query execution.
• Inadequate system resources such as CPU, memory, or I/O constraints causing the parallel query server to fail.
• Data skewness or data distribution issues leading to uneven workload distribution among parallel query servers.
• Incompatibility between the software version and the parallel query processing requirements.
• Issues with parallel hint usage or incorrect query structure affecting the parallel query execution.

By addressing these potential causes and fine-tuning the configuration settings, it is possible to mitigate the Ora-12801 error and optimize the performance of parallel query processing in the Oracle database environment.

To resolve the Ora-12801: error signaled in parallel query server issue, follow these steps:

1. Check Parallel Query Settings: Verify the parallel query settings in your database configuration. Ensure that the parallelism parameters are correctly set up.
2. Review Query: Analyze the SQL query that triggered the error. Check if there are any parts of the query that could be optimized or rewritten to avoid parallel processing issues.
3. Monitor System Resources: Monitor the system resources such as CPU and memory usage during query execution. Ensure that there is enough available resources for parallel processing.
4. Tune Queries: Consider tuning the queries to potentially reduce the need for parallel processing, thereby minimizing the occurrence of parallel query server errors.
5. Review Execution Plan: Examine the execution plan of the query to identify any inefficiencies. Make adjustments as needed to optimize query performance.

By following these steps, you can address the Ora-12801 error and enhance the efficiency of your parallel query server operations.