How To Fix DB11170 - Wait event 'db file seqentiel+scattered+parallel read'

SAP Error Message - Details

• Message type: E = Error

• Message class: DB11 - Oracle Monitor: messages

• Message number: 170

• Message text: Wait event 'db file seqentiel+scattered+parallel read'

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 DB11170 - Wait event 'db file seqentiel+scattered+parallel read' ?

  The SAP error message DB11170, which indicates a wait event related to "db file sequential read" or "db file scattered read," typically points to performance issues in the database layer, particularly with Oracle databases. This error suggests that the database is experiencing delays while trying to read data from disk into memory.
  Causes:
  
  High I/O Waits: The database is waiting for disk I/O operations to complete, which can be caused by slow disk performance or high contention for disk resources.
  Insufficient Memory: If the database buffer cache is too small, it may lead to increased disk reads as data is not cached in memory.
  Poorly Optimized Queries: Inefficient SQL queries can lead to excessive reads, causing the database to wait longer for data retrieval.
  Database Configuration: Suboptimal database parameters or configurations can lead to inefficient data access patterns.
  High Concurrency: Multiple sessions trying to access the same data can lead to contention and increased wait times.
  
  Solutions:
  
  Optimize SQL Queries: Review and optimize the SQL queries that are causing high wait times. Use tools like the Oracle SQL Tuning Advisor to identify and improve inefficient queries.
  Increase Memory Allocation: Consider increasing the size of the database buffer cache (e.g., the DB_CACHE_SIZE parameter) to reduce the need for disk reads.
  Check Disk Performance: Monitor disk performance and consider upgrading to faster storage solutions (e.g., SSDs) if disk I/O is a bottleneck.
  Database Statistics: Ensure that database statistics are up to date. Use the DBMS_STATS package to gather statistics on tables and indexes.
  Review Execution Plans: Analyze the execution plans of the queries to identify any full table scans or inefficient access paths that could be optimized.
  Partitioning: If applicable, consider partitioning large tables to improve query performance and reduce I/O contention.
  Database Configuration: Review and adjust database parameters to ensure optimal performance based on the workload.
  
  Related Information:
  
  Monitoring Tools: Use Oracle's Automatic Workload Repository (AWR) reports or Oracle Enterprise Manager to monitor wait events and identify performance bottlenecks.
  SAP Notes: Check SAP Notes for any specific recommendations or patches related to performance issues with your version of SAP and Oracle.
  Database Tuning: Regularly perform database tuning and maintenance tasks to ensure optimal performance.
  
  By addressing the underlying causes of the wait events, you can improve the performance of your SAP system and reduce the occurrence of the DB11170 error message.