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

SAP Error Message - Details

• Message type: E = Error

• Message class: /SDF/DB6 -

• Message number: 157

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

  The SAP error message /SDF/DB6157 indicates that the percentage of dirty pages in the database has exceeded a predefined threshold. This situation typically arises in SAP systems that use the SAP HANA database, where "dirty pages" refer to 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.
  Cause:
  
  High Write Activity: If there are many write operations occurring in the database, it can lead to an accumulation of dirty pages.
  Insufficient I/O Capacity: The underlying storage system may not be able to keep up with the rate of writes, causing a backlog of dirty pages.
  Configuration Issues: The database configuration settings related to memory management and dirty page thresholds may not be optimized for the workload.
  Long-running Transactions: Transactions that take a long time to commit can hold onto dirty pages longer than necessary.
  
  Solution:
  
  Monitor and Analyze: Use SAP HANA Studio or other monitoring tools to analyze the database performance and identify the root cause of the high dirty page percentage.
  Increase I/O Capacity: If the storage system is a bottleneck, consider upgrading the hardware or optimizing the storage configuration to improve I/O performance.
  Adjust Configuration Settings: Review and adjust the database configuration settings related to memory management and dirty page thresholds. This may involve tuning parameters such as max_dirty_page_percentage.
  Optimize Transactions: Review application logic to ensure that transactions are kept as short as possible. Avoid long-running transactions that can hold onto dirty pages.
  Regularly Commit Transactions: Ensure that transactions are committed regularly to reduce the number of dirty pages.
  Database Maintenance: Perform regular database maintenance tasks, such as backups and cleanups, to ensure optimal performance.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may provide additional guidance or patches related to this error.
  SAP HANA Documentation: Refer to the official SAP HANA documentation for best practices on memory management and performance tuning.
  Monitoring Tools: Utilize SAP HANA monitoring tools to keep track of memory usage, dirty pages, and overall database health.
  
  If the issue persists after taking these steps, it may be beneficial to consult with SAP support or a database administrator with experience in SAP HANA to further diagnose and resolve the problem.