How To Fix DB02085 - &1 > &2: dbwr_io_slaves set higher than threshold

SAP Error Message - Details

• Message type: E = Error

• Message class: DB02 - For Oracle Component of the Database Monitor

• Message number: 085

• Message text: &1 > &2: dbwr_io_slaves set higher than threshold

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 DB02085 - &1 > &2: dbwr_io_slaves set higher than threshold ?

  The SAP error message DB02085 indicates that the number of I/O slaves for the database writer (DBWR) has exceeded a predefined threshold. This can lead to performance issues, as it suggests that the database is under heavy load or that the configuration may not be optimal for the current workload.
  Cause:
  
  High Database Load: The database is experiencing a high volume of write operations, which can occur during peak usage times or due to specific transactions that generate a lot of data.
  Configuration Issues: The DBWR I/O slaves may be set too high for the current hardware capabilities or workload, leading to inefficiencies.
  Insufficient Resources: The underlying hardware (CPU, memory, disk I/O) may not be sufficient to handle the current workload, causing the DBWR to spawn more I/O slaves.
  Database Configuration: The database parameters related to I/O operations may not be optimally configured.
  
  Solution:
  
  Monitor Database Performance: Use monitoring tools to analyze the database performance and identify the root cause of the high I/O operations.
  Adjust DBWR Configuration: Review and adjust the DBWR I/O slave settings. This can be done by modifying the relevant database parameters (e.g., dbwr_io_slaves) to a more appropriate value based on the workload and system capabilities.
  Optimize Workload: If specific transactions are causing excessive writes, consider optimizing those transactions or spreading the load more evenly.
  Increase Hardware Resources: If the database is consistently under heavy load, consider upgrading the hardware (e.g., adding more CPU, memory, or faster disks) to better handle the workload.
  Database Tuning: Perform database tuning to optimize performance, which may include adjusting other parameters related to memory allocation, I/O operations, and caching.
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to DBWR performance and tuning for specific recommendations and best practices.
  Database Documentation: Refer to the documentation for your specific database (e.g., Oracle, HANA, etc.) for guidelines on configuring DBWR and managing I/O operations.
  Performance Monitoring Tools: Utilize SAP's performance monitoring tools (like ST03N, ST04) to analyze workload and performance metrics.
  Consult with DBA: If the issue persists, consult with a database administrator (DBA) who can provide insights and help with advanced tuning and configuration.
  
  By addressing the underlying causes and optimizing the configuration, you can resolve the DB02085 error and improve the overall performance of your SAP system.