How To Fix DB6PM739 - Increasing SORTHEAP may affect SHEAPTHRES (DBMCFG)

SAP Error Message - Details

• Message type: E = Error

• Message class: DB6PM - DB2 UDB for UNIX, Windows: Performance Monitoring

• Message number: 739

• Message text: Increasing SORTHEAP may affect SHEAPTHRES (DBMCFG)

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message DB6PM739 - Increasing SORTHEAP may affect SHEAPTHRES (DBMCFG) ?

  The SAP error message DB6PM739 indicates that the SORTHEAP parameter is being increased, which may have implications for the SHEAPTHRES parameter in the database configuration. This message typically arises in the context of IBM Db2 databases used with SAP systems.
  Cause:
  The error occurs when the SORTHEAP memory allocation is increased beyond a certain threshold, which can lead to potential issues with the SHEAPTHRES setting. SHEAPTHRES is a configuration parameter that defines the maximum amount of memory that can be allocated for the database's shared memory heap. If SORTHEAP is increased significantly, it may exceed the limits set by SHEAPTHRES, leading to performance issues or memory allocation failures.
  Solution:
  To resolve this issue, you can take the following steps:
  
  
  Review Current Settings:
  
  Check the current values of SORTHEAP and SHEAPTHRES in your database configuration. You can do this using the Db2 command line or through SAP transaction codes that allow you to view database parameters.
  
  
  
  Adjust SHEAPTHRES:
  
  If SORTHEAP needs to be increased for performance reasons, consider increasing the SHEAPTHRES parameter accordingly. This can be done using the following command in the Db2 command line:
  UPDATE DBM CFG USING SHEAPTHRES <new_value>
  
  Replace <new_value> with the appropriate value that accommodates the increased SORTHEAP.
  
  
  
  Monitor Performance:
  
  After making changes, monitor the database performance to ensure that the adjustments have the desired effect and do not lead to other issues.
  
  
  
  Consult Documentation:
  
  Refer to the official SAP and Db2 documentation for best practices regarding memory management and configuration settings. This can provide insights into optimal values for SORTHEAP and SHEAPTHRES based on your specific workload and system architecture.
  
  
  
  Test Changes:
  
  Before applying changes in a production environment, test them in a development or staging environment to assess their impact.
  
  
  
  Related Information:
  
  Db2 Documentation: Review the IBM Db2 documentation for detailed explanations of memory parameters and their implications.
  SAP Notes: Check SAP Notes for any specific recommendations or patches related to memory management and performance tuning for your version of SAP and Db2.
  Performance Tuning: Consider engaging with a database administrator (DBA) or SAP Basis consultant for performance tuning and optimization strategies tailored to your environment.
  
  By carefully managing the SORTHEAP and SHEAPTHRES parameters, you can optimize your SAP system's performance while avoiding potential memory-related issues.