How To Fix DB6PM764 - DBCFG - DFT-PREFETCH_SZ should be a factor or multiple of DFT_EXTENT_SZ

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 764

• Message text: DBCFG - DFT-PREFETCH_SZ should be a factor or multiple of DFT_EXTENT_SZ

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message DB6PM764 - DBCFG - DFT-PREFETCH_SZ should be a factor or multiple of DFT_EXTENT_SZ ?

  The SAP error message DB6PM764 indicates a configuration issue related to database settings, specifically concerning the parameters DFT-PREFETCH_SZ and DFT_EXTENT_SZ. This error typically arises in the context of database management systems, such as IBM Db2, which is often used with SAP applications.
  Cause:
  The error message states that the DFT-PREFETCH_SZ (default prefetch size) should be a factor or multiple of DFT_EXTENT_SZ (default extent size). This means that the prefetch size must be configured in such a way that it can be evenly divided by the extent size. If this condition is not met, the database may not function optimally, leading to performance issues or errors during data retrieval.
  Solution:
  To resolve this error, you need to adjust the configuration of the database parameters. Here are the steps you can take:
  
  
  Check Current Settings:
  
  Use the database management tools or SQL commands to check the current values of DFT-PREFETCH_SZ and DFT_EXTENT_SZ.
  
  
  
  Adjust DFT-PREFETCH_SZ:
  
  If DFT-PREFETCH_SZ is not a factor or multiple of DFT_EXTENT_SZ, you will need to change it. You can set it to a value that meets the requirement. For example, if DFT_EXTENT_SZ is 4 KB, then valid values for DFT-PREFETCH_SZ could be 4 KB, 8 KB, 12 KB, etc.
  
  
  
  Modify Database Configuration:
  
  Use the appropriate SQL command or database management interface to modify the configuration. For example, in Db2, you might use:
  UPDATE DATABASE CONFIGURATION USING DFT_PREFETCH_SZ <new_value>;
  
  Replace <new_value> with the new prefetch size that meets the criteria.
  
  
  
  Restart the Database:
  
  After making changes to the database configuration, you may need to restart the database for the changes to take effect.
  
  
  
  Test the Configuration:
  
  After restarting, verify that the error message no longer appears and that the database is functioning correctly.
  
  
  
  Related Information:
  
  Documentation: Refer to the official documentation for your specific database system (e.g., IBM Db2) for detailed information on configuration parameters and their implications.
  Performance Tuning: Adjusting these parameters can have a significant impact on database performance. It is advisable to monitor performance after making changes and adjust as necessary.
  SAP Notes: Check SAP Notes and Knowledge Base Articles for any specific recommendations or known issues related to this error message.
  
  By ensuring that DFT-PREFETCH_SZ is a factor or multiple of DFT_EXTENT_SZ, you can resolve the error and optimize database performance.