How To Fix DB6157 - The percentage of the dirty page threshold cleaners is too high

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 157

• Message text: The percentage of the dirty page threshold 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 DB6157 - The percentage of the dirty page threshold cleaners is too high ?

  The SAP error message DB6157, which states "The percentage of the dirty page threshold cleaners is too high," typically relates to the database's management of memory and dirty pages. This error is often encountered in SAP systems that use databases like SAP HANA, Oracle, or others, and it indicates that the percentage of dirty pages (pages that have been modified but not yet written to disk) is exceeding a predefined threshold.
  Cause:
  
  High Write Activity: If there is a high volume of write operations occurring in the database, it can lead to an accumulation of dirty pages.
  Insufficient I/O Capacity: The database may not be able to write dirty pages to disk quickly enough due to limited I/O capacity.
  Configuration Issues: The database configuration settings for dirty page thresholds may not be optimal for the current workload.
  Memory Pressure: If the system is under memory pressure, it may not be able to efficiently manage dirty pages.
  
  Solution:
  
  Increase I/O Capacity: Ensure that the underlying storage system has sufficient I/O capacity to handle the write operations. This may involve upgrading hardware or optimizing storage configurations.
  Adjust Database Configuration: Review and adjust the database configuration settings related to dirty page thresholds. This may include increasing the threshold limits if appropriate.
  Optimize Application Logic: Analyze the application logic to identify and optimize any processes that may be generating excessive write operations.
  Monitor and Tune Performance: Use monitoring tools to track database performance and identify bottlenecks. Regularly tune the database to ensure optimal performance.
  Increase Memory Allocation: If the system is under memory pressure, consider increasing the memory allocation for the database to help manage dirty pages more effectively.
  Database Maintenance: Regularly perform database maintenance tasks, such as cleaning up old data, to reduce the overall load on the database.
  
  Related Information:
  
  Monitoring Tools: Utilize SAP's monitoring tools (like SAP Solution Manager) or database-specific monitoring tools to keep an eye on performance metrics.
  Database Documentation: Refer to the specific database documentation for guidelines on managing dirty pages and configuring thresholds.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  Performance Tuning Guides: Consult performance tuning guides specific to the database being used with SAP to ensure best practices are being followed.
  
  If the issue persists after trying the above solutions, it may be beneficial to engage with SAP support or a database administrator for further analysis and assistance.