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MXS-2654 Document QC cache statistics

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Johan Wikman
2019-09-25 16:45:54 +03:00
parent fcc7642328
commit 54ec30cc8e
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Documentation/Getting-Started/Configuration-Guide.md
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@ -759,6 +759,17 @@ amount of memory available for each thread, divide the cache size with the value
of `threads`. If statements are evicted from the cache (visible in the of `threads`. If statements are evicted from the cache (visible in the
diagnostic output), consider increasing the cache size. diagnostic output), consider increasing the cache size.
Using `maxctrl show threads` it is possible to check what the actual size of
the cache is and to see performance statistics.
Key|Meaning
---|-------
QC cache size|The current size of the cache (bytes).
QC cache inserts|How many entries have been inserted into the cache.
QC cache hits|How many times the classification result has been found from the cache.
QC cache misses|How many times the classification result has not been found from the cache, but the classification had to be performed.
QC cache evictions|How many times a cache entry has had to be removed from the cache, in order to make place for another.
### `query_classifier_args` ### `query_classifier_args`
Arguments for the query classifier. What arguments are accepted depends on the Arguments for the query classifier. What arguments are accepted depends on the