How To Fix DB02114 - db_file_multiblock_read_count. Blocks read during complete tablescan I/O.

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 114

• Message text: db_file_multiblock_read_count. Blocks read during complete tablescan I/O.

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message DB02114 - db_file_multiblock_read_count. Blocks read during complete tablescan I/O. ?

  The SAP error message DB02114 with the description "db_file_multiblock_read_count. Blocks read during complete tablescan I/O" typically indicates that the database is performing a full table scan, and it is reporting the number of blocks read during this operation. This can be a performance concern, especially if the number of blocks read is high, as it may indicate inefficient queries or database design.
  Cause:
  
  
  Full Table Scans: The error suggests that a full table scan is being performed, which can happen due to:
  
  Lack of appropriate indexes on the table being queried.
  Queries that do not use indexes effectively (e.g., using functions on indexed columns).
  Large tables where the optimizer decides that a full scan is more efficient than using an index.
  Poorly written SQL queries that do not filter data effectively.
  
  
  
  Database Configuration: The database parameters related to I/O operations may not be optimized for the workload.
  
  
  Statistics: Outdated or missing statistics can lead the optimizer to make suboptimal decisions, resulting in full table scans.
  
  
  Solution:
  
  
  Indexing:
  
  Analyze the queries that are causing the full table scans and consider adding appropriate indexes to the tables involved.
  Use composite indexes if multiple columns are frequently queried together.
  
  
  
  Query Optimization:
  
  Review and optimize the SQL queries to ensure they are written efficiently.
  Avoid using functions on indexed columns in the WHERE clause, as this can prevent the use of indexes.
  
  
  
  Update Statistics:
  
  Ensure that database statistics are up to date. This can help the optimizer make better decisions regarding the execution plan.
  Use commands like ANALYZE TABLE or DBMS_STATS (for Oracle databases) to gather statistics.
  
  
  
  Database Configuration:
  
  Review and adjust database parameters related to I/O and memory allocation to optimize performance.
  Consider increasing the db_file_multiblock_read_count parameter if it is set too low, but this should be done with caution and based on performance testing.
  
  
  
  Monitoring and Analysis:
  
  Use database monitoring tools to analyze query performance and identify problematic queries.
  Look for patterns in the queries that lead to full table scans and address them accordingly.
  
  
  
  Related Information:
  
  Database Documentation: Refer to the specific database documentation (e.g., Oracle, SQL Server, etc.) for details on optimizing queries and managing indexes.
  SAP Notes: Check SAP Notes for any specific recommendations or patches related to this error message.
  Performance Tuning: Consider engaging in performance tuning sessions to analyze and improve overall database performance.
  
  By addressing the underlying causes of the full table scans and optimizing the database and queries, you can reduce the occurrence of this error and improve overall system performance.