How To Fix DB02066 - Oracle buffer cache monitoring

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 066

• Message text: Oracle buffer cache monitoring

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.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message DB02066 - Oracle buffer cache monitoring ?

  The SAP error message DB02066 related to Oracle buffer cache monitoring typically indicates that there is an issue with the Oracle database's buffer cache performance. This message is part of the database monitoring tools provided by SAP to help administrators ensure that the database is running optimally.
  Cause:
  The error message DB02066 can be triggered by several factors, including:
  
  Insufficient Buffer Cache Size: The buffer cache may not be large enough to hold frequently accessed data, leading to increased disk I/O and slower performance.
  High Cache Miss Ratio: A high percentage of cache misses indicates that the database is frequently accessing data that is not in the buffer cache, which can slow down performance.
  Improper Configuration: The Oracle database parameters related to memory allocation may not be optimally configured for the workload.
  Increased Workload: A sudden increase in database workload can lead to buffer cache contention and performance degradation.
  
  Solution:
  To address the DB02066 error, consider the following steps:
  
  Monitor Buffer Cache Usage: Use Oracle's performance monitoring tools (like AWR reports) to analyze buffer cache usage and identify patterns.
  Increase Buffer Cache Size: If the buffer cache is too small, consider increasing its size. This can be done by adjusting the DB_CACHE_SIZE parameter in the Oracle database configuration.
  Tune SQL Queries: Optimize SQL queries to reduce the number of cache misses. This may involve indexing, rewriting queries, or analyzing execution plans.
  Review Database Configuration: Ensure that the Oracle database parameters are set correctly for your specific workload. This includes parameters like SGA_TARGET and PGA_AGGREGATE_TARGET.
  Regular Maintenance: Perform regular database maintenance tasks, such as gathering statistics and rebuilding indexes, to ensure optimal performance.
  Consult Oracle Documentation: Refer to Oracle's documentation for specific recommendations on buffer cache tuning and performance optimization.
  
  Related Information:
  
  Oracle Performance Tuning: Familiarize yourself with Oracle performance tuning best practices, including memory management and SQL optimization.
  SAP Notes: Check SAP Notes for any specific recommendations or patches related to the DB02066 error.
  Monitoring Tools: Utilize SAP's database monitoring tools (like DBACOCKPIT) to keep an eye on database performance metrics.
  AWR Reports: If you have access to Oracle's Automatic Workload Repository (AWR), generate reports to analyze performance issues related to buffer cache.
  
  By following these steps and monitoring your Oracle database closely, you can mitigate the issues related to the DB02066 error and improve overall database performance.