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Spotlight on SAP ASE 2.12 - User Guide

Spotlight on SAP ASE
Background Information Desktop Features Connect to SAP ASE Spotlight® on SAP ASE Drilldowns Spotlight® on SAP ASE Alarms Glossary
Spotlight Basics
Spotlight Connections Monitor Spotlight Connections Alarms Charts, Grids And Home Page Components View | Options Troubleshooting
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Connect to Windows Systems Background Information Home Page Alarms Drilldowns View | Options Troubleshooting
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Data Cache Hit Rate

The hit rate reports the percentage of cache hits compared to the total number of cache searches. This value is a summary of the default data cache and all the named caches combined. 

Diagnosing a cache hit rate requires an understanding of how the application uses each cache. In caches that are created to hold specific objects, such as an index or a look up table, cache hit ratios may reach 100%. In caches used for random point queries on very large tables, cache hit ratios may be quite low but still represent an effective use of the cache.

To determine how effective the overall cache design for this server is, wait until the load on a server has been normalized.

See the Data Cache tab on the Memorydrilldown if the cache hit rate is high. Investigate the individual data cache's performance statistics.

  

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