How To Fix SDBALM090 - Hit rate of the converter cache in %

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 090

• Message text: Hit rate of the converter cache in %

Description
The system calculates and displays the hitrate since the last run of
the data collector. In the case of the first run of the data collector
after a restart of the instance, or after the Alert Monitor is started,
the system does not display a hitrate.
Data Collector
<ZH>Collector B</>
(RZ20 -> SAP CCMS Technical Experts Monitors -> All Monitoring Contexts
,,-> <Name of the database connection> -> Collectors and Internals
-> Collectors -> Collector B)

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Preset runtime interval of Collector B: 15 minutes

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message SDBALM090 - Hit rate of the converter cache in % ?

  The SAP error message SDBALM090 indicates that the hit rate of the converter cache is below a certain threshold, which can lead to performance issues in the system. This message is part of the database performance monitoring in SAP, specifically related to the database interface and the conversion of data types.
  Cause:
  The hit rate of the converter cache is a measure of how often the system can find the required data in the cache rather than having to retrieve it from the database. A low hit rate can be caused by several factors, including:
  
  Insufficient Cache Size: The cache may not be large enough to hold all the necessary data, leading to frequent cache misses.
  High Data Volume: A large volume of data being processed can lead to cache eviction, where older entries are removed to make space for new ones.
  Frequent Changes in Data: If the underlying data changes frequently, the cache may not be able to keep up, resulting in a lower hit rate.
  Configuration Issues: Incorrect configuration settings for the cache size or other related parameters can also lead to performance issues.
  
  Solution:
  To address the SDBALM090 error, consider the following solutions:
  
  Increase Cache Size: If the cache size is too small, consider increasing it. This can often be done through the database configuration settings.
  Monitor and Analyze Usage: Use SAP transaction codes like ST02 (Buffer Monitor) or ST04 (Database Performance Monitor) to analyze the cache usage and performance metrics.
  Optimize Queries: Review and optimize the SQL queries being executed to reduce the load on the converter cache.
  Database Tuning: Perform general database tuning and maintenance to ensure optimal performance. This may include updating statistics, reorganizing tables, or adjusting other database parameters.
  Review Data Model: If applicable, review the data model to ensure it is optimized for performance, which may involve indexing or partitioning strategies.
  Consult SAP Notes: Check for any relevant SAP Notes or updates that may address known issues related to the converter cache.
  
  Related Information:
  
  Transaction Codes: ST02 (Buffer Monitor), ST04 (Database Performance Monitor), ST03 (Workload Analysis).
  SAP Notes: Search the SAP Support Portal for notes related to SDBALM090 or converter cache performance.
  Documentation: Review SAP documentation on database performance tuning and cache management for more detailed guidance.
  
  By following these steps, you should be able to improve the hit rate of the converter cache and resolve the SDBALM090 error.