How To Fix /SDF/DB6018 - The package cache hit ratio is too low

SAP Error Message - Details

• Message type: E = Error

• Message class: /SDF/DB6 -

• Message number: 018

• Message text: The package cache hit ratio is too low

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 /SDF/DB6018 - The package cache hit ratio is too low ?

  The SAP error message /SDF/DB6018 The package cache hit ratio is too low indicates that the package cache hit ratio for the database is below an acceptable threshold. This can lead to performance issues, as a low hit ratio means that the database is frequently accessing the disk instead of retrieving data from the cache, which is much faster.
  Causes:
  
  Insufficient Cache Size: The package cache may not be large enough to hold frequently accessed data.
  High Workload: An increase in the number of concurrent users or transactions can lead to cache thrashing, where the cache is unable to keep up with the demand.
  Inefficient Queries: Poorly optimized SQL queries can lead to excessive database calls, reducing the effectiveness of the cache.
  Database Configuration: Incorrect database configuration settings can lead to suboptimal cache performance.
  Data Changes: Frequent changes to the data can invalidate cached entries, leading to a lower hit ratio.
  
  Solutions:
  
  Increase Cache Size: Adjust the configuration settings to increase the size of the package cache. This can often be done in the database configuration settings.
  Optimize Queries: Review and optimize SQL queries to ensure they are efficient and make use of indexes where appropriate.
  Monitor Workload: Use monitoring tools to analyze the workload on the database and identify any spikes or patterns that may be causing the low hit ratio.
  Database Tuning: Perform database tuning to optimize performance. This may include adjusting various parameters related to memory allocation and cache management.
  Regular Maintenance: Implement regular database maintenance tasks, such as updating statistics and rebuilding indexes, to ensure optimal performance.
  Review Application Logic: Ensure that the application logic is not causing unnecessary database calls, which can lead to cache misses.
  
  Related Information:
  
  Monitoring Tools: Use SAP's built-in monitoring tools or third-party solutions to track database performance metrics, including cache hit ratios.
  SAP Notes: Check SAP Notes for any specific recommendations or patches related to this error message.
  Database Documentation: Refer to the documentation for your specific database (e.g., HANA, Oracle, SQL Server) for best practices on cache management and performance tuning.
  SAP Community: Engage with the SAP Community for insights and shared experiences from other users who may have encountered similar issues.
  
  By addressing the underlying causes and implementing the suggested solutions, you can improve the package cache hit ratio and enhance overall database performance.