Diagnosis
This monitoring tree element (MTE) shows the hit ratio of a buffer. Thehit ratio is a measure of the quality or performance of the buffer. Itis the percentage of database requests that could be satisfied from thebuffer, without requiring the involvement of the database.

Procedure
Hit ratio alerts mean that poor buffer performance is reducing theperformance of the application server. The buffers in the alert monitorare critical to good instance performance. You should therefore analyzethe buffer quality problem and take corrective action.
In general, poor buffer quality means that a buffer is too small. If abuffer is too small, then the chances increase that requested objects(table entries, programs, and so on) will not be found in it. Theresult is a lower hit ratio, and, if the buffer is already full,increased swapping. Swapping increases as requested objects force olderobjects out of the buffer.
To improve the hit ratio, you should generally increase the size of abuffer.
Use the analysis method for this buffer to analyze the performance ofthe buffer before you enlarge it. Be sure that no temporary problem hasreduced the buffer's quality. (All buffers perform poorly during awarm-up phase after the system or an application server starts. Themonitoring architecture does not issue buffer alerts during a best-guesswarm-up period).
Further, the performance of the program buffer may be reduced ifdevelopers are working in a system or if objects are being imported intothe system with the SAP transport system.
Background Information
See also the descriptive message for buffer free space and the CCMSGuide under Help -> SAP Library -> SAP NetWeaver -> System Life CycleManagement -> Solution Monitoring -> Monitoring in the CCMS.