How To Fix RT562 - &1 &3 < &2 &3 (15 Min.) SAP buffer hitrate below threshold

SAP Error Message - Details

• Message type: E = Error

• Message class: RT - Monitoring infrastructure MSG and alert texts

• Message number: 562

• Message text: &1 &3 < &2 &3 (15 Min.) SAP buffer hitrate below threshold

What causes this issue?

The value for the buffer quality has fallen below the threshold value.
Buffer quality is defined by the percentage of requested objects taht
can be read directly from the buffer.

How to fix this error?

You can find information about this topic in:
<DS:TX.SMOI_BUFFER_MANAGEMENT_INFO>Background Information about SAP
BufferS</>
<LS>SAP Library -> Basis Components-> Computing Center Management
System (BC-CCM) -> Computing Center Management System (BC-CCM) -> ->
CCMS Monitoring -> SAP Buffers</>
<DS:NA.RT067>Buffer: Hitrate</>

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message RT562 - &1 &3 < &2 &3 (15 Min.) SAP buffer hitrate below threshold ?

  The SAP error message RT562 indicates that the buffer hit rate for a specific buffer (such as the data buffer, program buffer, or other types of buffers) has fallen below a defined threshold. This can lead to performance issues in the SAP system, as a low buffer hit rate means that the system is frequently accessing the database instead of retrieving data from memory, which is significantly faster.
  Cause:
  
  Insufficient Buffer Size: The buffer may not be large enough to hold the frequently accessed data, leading to more database reads.
  High Workload: An increase in the number of users or transactions can lead to a higher demand for data that exceeds the buffer capacity.
  Inefficient Data Access Patterns: Certain transactions or reports may be accessing data in a way that does not take advantage of the buffer.
  Configuration Issues: Incorrect configuration settings for the buffer sizes or thresholds can lead to suboptimal performance.
  Data Changes: Frequent changes to the data can lead to cache invalidation, causing the buffer to miss frequently.
  
  Solution:
  
  Increase Buffer Size: Adjust the buffer sizes in the SAP profile parameters (e.g., dbs/ora/db_block_size, abap/buffersize, etc.) to accommodate more data.
  Monitor and Analyze: Use transaction codes like ST02 (Tune Summary) and ST04 (Database Performance) to monitor buffer performance and identify bottlenecks.
  Optimize Programs: Review and optimize ABAP programs and transactions that are causing high buffer misses. This may involve rewriting queries or changing how data is accessed.
  Adjust Thresholds: If the threshold settings are too strict, consider adjusting them to allow for a more realistic assessment of buffer performance.
  Regular Maintenance: Perform regular database maintenance tasks, such as updating statistics and reorganizing tables, to ensure optimal performance.
  Review Workload: Analyze the workload on the system and consider load balancing or scaling up resources if necessary.
  
  Related Information:
  
  
  Transaction Codes: 
  
  ST02: Monitor buffer performance.
  ST04: Monitor database performance.
  SM12: Check for lock entries that may be causing delays.
  SM21: Review system logs for any related errors or warnings.
  
  
  
  SAP Notes: Check SAP Notes related to buffer performance and tuning for specific recommendations and best practices.
  
  
  Documentation: Refer to SAP Help documentation for detailed information on buffer management and performance tuning.
  
  
  By addressing the underlying causes and implementing the suggested solutions, you can improve the buffer hit rate and overall performance of your SAP system.