How To Fix SDBALM190 - Low hit rate in the converter cache (&1&3 < &2&3)

SAP Error Message - Details

• Message type: E = Error

• Message class: SDBALM - SAP DB and liveCache Alert Monitoring

• Message number: 190

• Message text: Low hit rate in the converter cache (&1&3 < &2&3)

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SDBALM190 - Low hit rate in the converter cache (&1&3 < &2&3) ?

  The SAP error message SDBALM190 indicates that there is a low hit rate in the converter cache, which can affect the performance of the system. This message typically appears in the context of database access and indicates that the system is not efficiently using the cache for database conversions.
  Cause:
  The low hit rate in the converter cache can be caused by several factors, including:
  
  
  High Volume of Unique Queries: If the application is generating a large number of unique queries that are not being reused, the cache may not have enough entries to serve repeated requests efficiently.
  
  
  Insufficient Cache Size: The size of the converter cache may be too small to accommodate the number of entries required for optimal performance.
  
  
  Frequent Changes in Data: If the underlying data changes frequently, the cache may be invalidated often, leading to a lower hit rate.
  
  
  Configuration Issues: Incorrect configuration settings for the cache can lead to suboptimal performance.
  
  
  Database Performance: If the database itself is slow or under heavy load, it may not be able to serve requests quickly, leading to a perception of low cache efficiency.
  
  
  Solution:
  To address the low hit rate in the converter cache, consider the following solutions:
  
  
  Increase Cache Size: Adjust the size of the converter cache in the SAP system configuration to allow for more entries. This can help improve the hit rate if the current size is insufficient.
  
  
  Optimize Queries: Review and optimize the queries being executed to reduce the number of unique queries and increase the likelihood of cache hits.
  
  
  Monitor and Analyze: Use SAP transaction codes such as ST02 (Tune Summary) to monitor the performance of the buffer and cache. Analyze the hit rates and identify patterns that may indicate issues.
  
  
  Database Tuning: Ensure that the database is properly tuned for performance. This may involve optimizing indexes, analyzing query performance, and ensuring that the database server has adequate resources.
  
  
  Review Configuration: Check the configuration settings related to the converter cache and make adjustments as necessary. This may involve consulting SAP documentation or working with your SAP Basis team.
  
  
  Regular Maintenance: Implement regular maintenance tasks to ensure that the database and cache are functioning optimally. This includes clearing old entries and ensuring that the cache is refreshed appropriately.
  
  
  Related Information:
  
  Transaction Codes: Use transaction codes like ST02 (Buffer Monitor) and ST04 (Database Performance Monitor) to analyze performance issues related to the cache and database.
  SAP Notes: Check for relevant SAP Notes that may provide additional guidance or patches related to this error message.
  Performance Monitoring: Regularly monitor system performance and cache hit rates to proactively address potential issues before they impact users.
  
  By following these steps, you can improve the hit rate in the converter cache and enhance the overall performance of your SAP system.