How To Fix LVCALM018 - Information about the database cache hit rate

SAP Error Message - Details

• Message type: E = Error

• Message class: LVCALM - liveCache: Alert Monitor Objects and Attributes

• Message number: 018

• Message text: Information about the database cache hit rate

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 LVCALM018 - Information about the database cache hit rate ?

  The SAP error message LVCALM018 relates to the database cache hit rate, which is an important performance metric in SAP systems. This message typically indicates that the database cache hit rate is lower than expected, which can lead to performance issues due to increased database access times.
  Cause:
  The low database cache hit rate can be caused by several factors, including:
  
  Insufficient Cache Size: The database cache may not be large enough to hold frequently accessed data, leading to more disk reads.
  High Volume of Data: A large volume of data being processed can lead to cache thrashing, where data is frequently loaded and evicted from the cache.
  Inefficient Queries: Poorly optimized SQL queries can lead to unnecessary database accesses.
  Database Configuration: Suboptimal database configuration settings can affect cache performance.
  Data Distribution: Uneven distribution of data can lead to some data being accessed more frequently than others, causing cache misses.
  
  Solution:
  To address the LVCALM018 error and improve the database cache hit rate, consider the following solutions:
  
  Increase Cache Size: If possible, increase the size of the database cache to accommodate more data.
  Optimize Queries: Review and optimize SQL queries to ensure they are efficient and make use of indexes where appropriate.
  Analyze Data Access Patterns: Use tools to analyze which data is accessed most frequently and adjust caching strategies accordingly.
  Database Configuration Tuning: Review and adjust database configuration settings to optimize performance. This may include parameters related to memory allocation and cache management.
  Regular Maintenance: Perform regular database maintenance tasks, such as updating statistics and rebuilding indexes, to ensure optimal performance.
  Monitor Performance: Continuously monitor the database performance and cache hit rate to identify trends and make adjustments as necessary.
  
  Related Information:
  
  Transaction Codes: Use transaction codes like ST02 (Tune Summary) and ST04 (Database Performance Analysis) to monitor and analyze buffer and cache performance.
  SAP Notes: Check SAP Notes related to performance tuning and database cache issues for specific recommendations and updates.
  Database Documentation: Refer to the documentation for your specific database (e.g., Oracle, SQL Server, HANA) for best practices on cache management and performance tuning.
  
  By addressing the underlying causes and implementing the suggested solutions, you can improve the database cache hit rate and enhance the overall performance of your SAP system.