How To Fix SMMSS_ALERTS021 - This alert tracks the data cache hit ratio of SQL Server

SMMSS_ALERTS021 - Overview

• Message type: E = Error

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

• Message number: 021

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

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message SMMSS_ALERTS021 - This alert tracks the data cache hit ratio of SQL Server ?

  The SAP error message SMMSS_ALERTS021 indicates that there is an issue with the data cache hit ratio of SQL Server. This alert is part of the monitoring system in SAP that tracks the performance of the SQL Server database, specifically focusing on how effectively the database is utilizing its cache.
  
  Cause:
  The data cache hit ratio is a performance metric that indicates how often SQL Server is able to retrieve data from memory (cache) rather than having to read it from disk. A low cache hit ratio can indicate several potential issues:
  
  Insufficient Memory: The SQL Server instance may not have enough memory allocated to effectively cache data.
  High Workload: An increase in the number of queries or transactions may lead to more data being requested than can be cached.
  Poor Query Performance: Inefficient queries may lead to excessive disk reads.
  Fragmentation: High levels of fragmentation in the database can lead to inefficient data retrieval.
  
  Configuration Issues: