How To Fix /SDF/DB6155 - The percentage of the dirty page steal cleaners is too high

SAP Error Message - Details

• Message type: E = Error

• Message class: /SDF/DB6 -

• Message number: 155

• Message text: The percentage of the dirty page steal cleaners is too high

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SDF/DB6155 - The percentage of the dirty page steal cleaners is too high ?

  The SAP error message /SDF/DB6155 The percentage of the dirty page steal cleaners is too high typically indicates that the database's dirty page steal cleaners are working harder than expected, which can lead to performance issues. This error is often related to the management of memory and disk I/O in the database system.
  Cause:
  
  High Volume of Dirty Pages: The error suggests that there is a high percentage of dirty pages in the buffer pool, which means that many pages in memory have been modified but not yet written to disk.
  Insufficient I/O Capacity: The system may not have enough I/O capacity to handle the volume of dirty pages being generated, leading to a backlog.
  Configuration Issues: The database configuration settings may not be optimized for the workload, leading to inefficient handling of dirty pages.
  Heavy Write Operations: Applications or processes that perform a large number of write operations can contribute to the accumulation of dirty pages.
  
  Solution:
  
  Increase I/O Capacity: Ensure that the underlying storage system has sufficient I/O capacity to handle the workload. This may involve upgrading hardware or optimizing storage configurations.
  Tune Database Parameters: Review and adjust database parameters related to memory management and I/O operations. This may include:
  
  Increasing the size of the buffer pool.
  Adjusting the dirty page threshold settings.
  Tuning the parameters for the dirty page steal cleaners.
  
  
  Monitor Workload: Use monitoring tools to analyze the workload and identify any processes that are generating excessive dirty pages. Optimize these processes if possible.
  Regular Maintenance: Implement regular database maintenance tasks, such as backups and cleanups, to help manage the number of dirty pages.
  Review Application Logic: If specific applications are causing excessive writes, review the application logic to see if it can be optimized to reduce the number of writes.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any specific recommendations or patches related to this error message. SAP frequently updates its knowledge base with solutions for known issues.
  Database Documentation: Refer to the documentation for the specific database being used (e.g., HANA, ASE, etc.) for best practices on managing dirty pages and tuning performance.
  Performance Monitoring Tools: Utilize SAP's performance monitoring tools (like SAP Solution Manager) to gain insights into system performance and identify bottlenecks.
  
  If the issue persists after trying the above solutions, it may be beneficial to engage with SAP support for further assistance.