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Keycache Probes

The keycache probes are triggered when using the index key cache used with the MylSAM storage

engine. Probes exist to monitor when data is read into the keycache, cached key data is written from

the cache into a cached file, or when accessing the keycache. Keycache usage indicates when data is read or written from the index files into the cache, and can be

used to monitor how efficient the memory allocated to the keycache is being used. A high number of

keycache reads across a rangę of queries may indicate that the keycache is too smali for size of data being accessed.