How To Fix DB6546 - Threshold for starting the asynchronous page cleaners

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 546

• Message text: Threshold for starting the asynchronous page cleaners

<LB>&CAUSE&</>
By setting this database configuration parameter (CHNGPGS_THRESH), you
determine at what number of changed pages in the buffer pool should
these be written asynchronously to the database. This is done by the
Page Cleaner.

System Response

If you set too high a value for the parameter, it may be that pages are
not written to the database on time. These pages are then written
(before they are replaced because of lack of space) synchronously; that
is, the application must wait until the page that is to be replaced has
been written.
On the other hand, if too low a value is set for the parameter, the
system will write pages to the database unnecessarily often.

How to fix this error?

If errors occur, correct the parameter using the command:
<LB>UPDATE DB CFG USING CHNGPGS_THRESH <value></>
You can find more information about this topic in the messages for the
<DS:NA.DB6152>Page Cleaner</>.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message DB6546 - Threshold for starting the asynchronous page cleaners ?

  The SAP error message DB6546 indicates that the threshold for starting the asynchronous page cleaners has been reached. This typically relates to database performance and memory management within the SAP system, particularly when using databases like SAP HANA, Oracle, or others.
  Cause:
  The error occurs when the database system detects that the memory usage has reached a certain threshold, which triggers the need for asynchronous page cleaners to start cleaning up memory pages. This can happen due to:
  
  High Memory Usage: The database is consuming a lot of memory, which may be due to large transactions, insufficient memory allocation, or inefficient queries.
  Configuration Issues: The parameters for memory management and page cleaning may not be optimally configured.
  Database Load: A high load on the database can lead to increased memory usage and trigger this error.
  Fragmentation: Over time, memory can become fragmented, leading to inefficient use of available memory.
  
  Solution:
  To resolve the DB6546 error, consider the following steps:
  
  Monitor Memory Usage: Use database monitoring tools to check memory usage patterns and identify any spikes or trends that could indicate issues.
  Adjust Configuration Parameters: Review and adjust the database configuration parameters related to memory management and page cleaning. This may include:
  
  Increasing the memory allocation for the database.
  Tuning parameters related to the asynchronous page cleaners.
  
  
  Optimize Queries: Analyze and optimize any long-running or resource-intensive queries that may be consuming excessive memory.
  Database Maintenance: Perform regular database maintenance tasks, such as:
  
  Rebuilding indexes.
  Updating statistics.
  Cleaning up old or unnecessary data.
  
  
  Increase Hardware Resources: If the database consistently reaches high memory usage, consider upgrading the hardware resources (e.g., adding more RAM).
  Consult Documentation: Refer to the specific database documentation for guidance on tuning memory management settings.
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to DB6546 for any specific recommendations or patches that may address the issue.
  Database Documentation: Review the documentation for the specific database you are using (e.g., SAP HANA, Oracle) for best practices on memory management and performance tuning.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they have implemented.
  
  By following these steps, you should be able to address the DB6546 error and improve the performance and stability of your SAP system.