How To Fix SDBALM177 - High proportion of OMS rollback data in the data cache (&1&3 > &2&3)

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 177

• Message text: High proportion of OMS rollback data in the data cache (&1&3 > &2&3)

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SDBALM177 - High proportion of OMS rollback data in the data cache (&1&3 > &2&3) ?

  The SAP error message SDBALM177 indicates that there is a high proportion of Online Transaction Processing (OLTP) rollback data in the data cache. This situation can lead to performance issues and may affect the overall stability of the system. The message typically includes parameters that specify the current and threshold values for the rollback data.
  Cause:
  The high proportion of rollback data in the data cache can be caused by several factors, including:
  
  
  Long-running Transactions: Transactions that take a long time to complete can generate a significant amount of rollback data, especially if they are frequently interrupted or rolled back.
  
  
  Frequent Rollbacks: If there are many transactions that are being rolled back, this can lead to an accumulation of rollback data in the cache.
  
  
  Insufficient Memory Allocation: If the data cache is not adequately sized to handle the workload, it may lead to a higher proportion of rollback data.
  
  
  Inefficient SQL Statements: Poorly optimized SQL queries can lead to longer execution times and increased chances of rollbacks.
  
  
  Concurrency Issues: High levels of concurrent transactions can lead to contention and increased rollbacks.
  
  
  Solution:
  To address the SDBALM177 error, consider the following solutions:
  
  
  Analyze Long-running Transactions: Identify and optimize long-running transactions. Use transaction monitoring tools to find transactions that take longer than expected and analyze their execution plans.
  
  
  Review and Optimize SQL Statements: Check for inefficient SQL queries and optimize them. Use the SQL trace (ST05) or the SQL performance analysis tools available in SAP.
  
  
  Increase Data Cache Size: If the data cache is too small, consider increasing its size. This can be done through the SAP profile parameters, specifically the dbs/ora/roll_cache_size parameter for Oracle databases.
  
  
  Monitor and Reduce Rollbacks: Investigate the reasons for frequent rollbacks. This may involve reviewing application logic, error handling, and transaction management practices.
  
  
  Adjust Concurrency Settings: If high concurrency is causing issues, consider adjusting the settings for transaction isolation levels or implementing locking strategies to reduce contention.
  
  
  Regular Maintenance: Perform regular database maintenance tasks, such as updating statistics and rebuilding indexes, to ensure optimal performance.
  
  
  Related Information:
  
  Transaction Monitoring: Use transaction codes like ST03N (Workload Analysis) and ST04 (Database Performance Analysis) to monitor system performance and identify bottlenecks.
  SAP Notes: Check for relevant SAP Notes that may provide additional insights or patches related to this error message.
  Database-Specific Tuning: Depending on the database being used (e.g., Oracle, SQL Server), consult the respective database documentation for tuning recommendations related to rollback segments and cache management.
  
  By addressing the underlying causes and implementing the suggested solutions, you can reduce the proportion of rollback data in the data cache and improve the overall performance of your SAP system.