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To ensure peak storage performance the usage of the cache should be continuously monitored, cache misses should be promptly captured, and the reasons for the same should be diagnosed. Therefore, it is imperative that administrators should continuously monitor performance of the cache to ensure better user experience. The EndecaCacheTest helps administrators in this regard.

This test closely monitors the cache, tracks the percentage of cache hits, misses and number of lookups, and alerts administrators if the value deviates from the acceptable limits. In addition, the test also reports the count of evictions, number of reinsertions and rejections, time taken for reinsertion, etc. Using the pointers provided by this test, administrators can fine-tune the cache for best performance.

Outputs of the test : One set of results for every cache on the Endeca search application being monitored.

Measurement	Description	Measurement Unit	Interpretation
Entry_count	Indicates the total number of entry in this cache.	Number	The value of this measure should not exceed the specified maximum number of entries in the cache.
All_entities_size	Indicates the total size of all entries in this cache.	MB	Ideally, the value of this measure should be low.
Number_of_lookup	Indicates the number of times the cache was looked up for serving read requests during the last measurement period.	Number
Hit_pct	Indicates the percentage of requests that have been serviced by this cache.	Percent	Ideally the value of this measure should be high.
Miss_pct	Indicates the percentage of requests that have not been serviced by this cache.	Percent	A low value is desired for this measure.
Evictions_count	Indicates total number of evictions from this cache.	Number	A high value is desired for this measure. If the percentage of the maximum cache size that is used by the cache is very high and the value of this measure is very low, it can only mean that data is not evicted frequently enough to control cache growth. You may have to fine-tune eviction to ensure that the cache does not grow uncontrollably.
Unproductive_evictions	Indicates total number of unproductive evictions from this cache.	Number	Ideally, the value of this measure should be high. This measure can control the cache growth and thereby reduce the risk of available disk space usage and related bottleneck conditions.
Evictions_size	Indicates size of eviction from this cache.	MB
Avg_creation	Indicates average time taken for creation by this cache.	Seconds	Ideally, the value of this measure should be low.
Avg_eviction	Indicates average time taken for eviction by this cache.	Seconds	A low value is desired for this measure.
Avg_unproduct_eviction	Indicates average time taken for unproductive eviction.	Seconds	A low value is desired for this measure.
Rejected_counts	Indicates total number of rejections to this cache.	Number	The value of this measure should be low. A high value is an indication of higher number of potential entry rejections to the entity cache. This indicates that the cache is undersized and you may want to increase it.
Reinsertion_count	Indicates total number of reinsertions in this cache.	Number	The value of this measure indicate the number of queries that are computing the same values.
Reinsertion_creation	Indicates time taken for calculating identical results in parallel with other queries.	Seconds	Ideally, the value of this measure should be low.
Eviction_per_quartile	Indicates total number of evictions per quartile from this cache.	Number	Most of the time the data in the lowest quartile of use is evicted.