How To Fix SMMSS_ALERTS069 - This alert shows the % of logical reads used by a single statement

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 069

• Message text: This alert shows the % of logical reads used by a single statement

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SMMSS_ALERTS069 - This alert shows the % of logical reads used by a single statement ?

  The SAP error message SMMSS_ALERTS069 indicates that a specific SQL statement is consuming a high percentage of logical reads in the database. This alert is part of the SAP Performance Management tools, which help monitor and optimize database performance.
  Cause:
  The primary cause of this alert is that a single SQL statement is executing with a high number of logical reads, which can indicate inefficiencies in the query. This can happen due to several reasons:
  
  Inefficient Query Design: The SQL statement may not be optimized, leading to excessive data being read from the database.
  Lack of Indexes: If the necessary indexes are not present, the database engine may need to perform full table scans, resulting in high logical reads.
  Data Volume: Large tables with a significant amount of data can lead to increased logical reads if the query is not selective enough.
  Parameter Sniffing: If the query plan is not optimal for the parameters being passed, it can lead to inefficient execution.
  Database Statistics: Outdated or inaccurate statistics can lead the query optimizer to choose suboptimal execution plans.
  
  Solution:
  To address the SMMSS_ALERTS069 alert, consider the following steps:
  
  
  Analyze the Query: Use tools like SQL Trace (ST05) or SQL Performance Tuning Workbench (ST04) to analyze the execution plan of the SQL statement. Look for areas where the query can be optimized.
  
  
  Optimize the SQL Statement: Rewrite the SQL query to make it more efficient. This may involve:
  
  Reducing the number of columns selected.
  Adding WHERE clauses to filter data more effectively.
  Using JOINs appropriately to minimize data retrieval.
  
  
  
  Create or Update Indexes: Ensure that the necessary indexes are in place to support the query. This can significantly reduce the number of logical reads.
  
  
  Update Database Statistics: Run the database statistics update to ensure that the query optimizer has the most accurate information to create efficient execution plans.
  
  
  Monitor and Test: After making changes, monitor the performance of the SQL statement again to ensure that the logical reads have decreased. Testing in a non-production environment is recommended before applying changes to production.
  
  
  Consult Documentation: Refer to SAP documentation and best practices for performance tuning specific to your database system (e.g., HANA, Oracle, SQL Server).
  
  
  Related Information:
  
  Transaction Codes: Use transaction codes like ST04 (Database Performance Analysis) and ST05 (SQL Trace) to gather more information about the performance of SQL statements.
  SAP Notes: Check for relevant SAP Notes that may provide additional guidance or fixes related to performance issues.
  Performance Tuning Guides: SAP provides various performance tuning guides for different database systems that can help in optimizing SQL queries and database performance.
  
  By following these steps, you can effectively address the SMMSS_ALERTS069 alert and improve the performance of your SAP system.