How To Fix SMMSS_ALERTS022 - This alert tracks the procedure cache hit ratio of SQL Server

SAP Error Message - Details

• Message type: E = Error

• Message class: SMMSS_ALERTS - Message class for MSSQL rz20 messages

• Message number: 022

• Message text: This alert tracks the procedure cache hit ratio of SQL Server

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SMMSS_ALERTS022 - This alert tracks the procedure cache hit ratio of SQL Server ?

  The SAP error message SMMSS_ALERTS022 indicates that there is an issue with the procedure cache hit ratio of SQL Server. This alert is part of the monitoring system in SAP that tracks the performance of the underlying database, in this case, Microsoft SQL Server.
  Cause:
  The procedure cache hit ratio is a performance metric that indicates how often SQL Server can find the execution plan for a query in memory rather than having to recompile it. A low hit ratio suggests that SQL Server is frequently recompiling queries, which can lead to performance degradation. The potential causes for a low procedure cache hit ratio include:
  
  Insufficient Memory: SQL Server may not have enough memory allocated to cache execution plans.
  High Query Variability: If there are many different queries being executed, SQL Server may not be able to cache plans effectively.
  Frequent Changes to the Database: Changes in the database schema or statistics can lead to recompilation of execution plans.
  Parameter Sniffing Issues: SQL Server may generate suboptimal execution plans based on the parameters of the first execution of a query.
  High Load: A sudden increase in workload can lead to cache eviction, causing a drop in the hit ratio.
  
  Solution:
  To address the issue indicated by the SMMSS_ALERTS022 alert, consider the following solutions:
  
  
  Increase Memory Allocation: Ensure that SQL Server has sufficient memory allocated. You can adjust the maximum server memory setting in SQL Server to allow more memory for caching execution plans.
  
  
  Optimize Queries: Review and optimize the queries that are frequently executed. Look for opportunities to reduce variability in queries, such as using parameterized queries.
  
  
  Update Statistics: Regularly update statistics on your tables to help SQL Server make better decisions about execution plans.
  
  
  Use Plan Guides: If certain queries are consistently problematic, consider using plan guides to force SQL Server to use a specific execution plan.
  
  
  Monitor and Analyze Performance: Use SQL Server's built-in performance monitoring tools (like SQL Server Profiler or Extended Events) to analyze which queries are causing the most recompilations and address them specifically.
  
  
  Review Indexing Strategy: Ensure that your indexing strategy is effective. Missing or poorly designed indexes can lead to inefficient query execution and increased recompilation.
  
  
  Consider Query Store: If you are using SQL Server 2016 or later, consider enabling Query Store, which can help you track query performance and identify problematic queries.
  
  
  Related Information:
  
  SQL Server Documentation: Refer to the official Microsoft SQL Server documentation for detailed information on performance tuning and memory management.
  SAP Notes: Check SAP Notes related to performance monitoring and SQL Server integration for any specific recommendations or patches.
  Performance Monitoring Tools: Consider using third-party performance monitoring tools that can provide deeper insights into SQL Server performance metrics.
  
  By addressing the underlying causes of the low procedure cache hit ratio, you can improve the performance of your SQL Server and reduce the frequency of the SMMSS_ALERTS022 alert.