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

SAP Error Message - Details

• Message type: E = Error

• Message class: DB6 - DB6: Alert Monitoring and Alert Configuration

• Message number: 155

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

INCLUDE BC_DB6_CLEANER OBJECT DOKU ID TX LANGUAGE EN

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

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

  The SAP error message DB6155, which states "The percentage of the dirty page steal cleaners is too high," typically relates to issues with the database's memory management, particularly in the context of the SAP HANA database or other databases that SAP might be using. This error indicates that the system is experiencing a high percentage of dirty pages, which are pages in memory that have been modified but not yet written to disk. When the percentage of these dirty pages becomes too high, it can lead to performance issues and potential data loss if not addressed.
  Causes:
  
  High Write Activity: If there are many write operations occurring, it can lead to an accumulation of dirty pages.
  Insufficient Memory: If the database does not have enough memory allocated, it may struggle to manage dirty pages effectively.
  Inefficient Cleaning Process: The background processes responsible for writing dirty pages to disk may not be functioning optimally.
  Configuration Issues: Incorrect configuration settings for memory management or the database can lead to this issue.
  Disk I/O Bottlenecks: If the underlying storage system is slow or experiencing issues, it can delay the writing of dirty pages to disk.
  
  Solutions:
  
  Increase Memory Allocation: Ensure that the database has sufficient memory allocated to handle the workload. This may involve adjusting the configuration settings for the database.
  Optimize Write Operations: Review the application and database design to minimize unnecessary write operations. Batch writes where possible.
  Tune Database Parameters: Adjust parameters related to the dirty page management and cleaning processes. This may include settings for the page cleaner or thresholds for dirty pages.
  Monitor and Optimize Disk I/O: Check the performance of the underlying storage system. Ensure that it is capable of handling the I/O load and consider upgrading if necessary.
  Review Background Processes: Ensure that the background processes responsible for cleaning dirty pages are running correctly and efficiently. Restarting these processes may help.
  Database Maintenance: Regularly perform database maintenance tasks, such as backups and consistency checks, to ensure optimal performance.
  
  Related Information:
  
  Monitoring Tools: Use SAP monitoring tools (like SAP Solution Manager) to keep an eye on database performance and memory usage.
  Database Logs: Check the database logs for any additional error messages or warnings that could provide more context about the issue.
  SAP Notes: Look for relevant SAP Notes or Knowledge Base Articles that may provide specific guidance or patches related to this error.
  Consult Documentation: Review the official SAP documentation for your specific database version to understand the best practices for memory management and performance tuning.
  
  If the problem persists after trying these solutions, it may be beneficial to consult with SAP support or a database administrator for further assistance.