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MXS-1992 Add qc cache documentation

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Johan Wikman 2018-07-30 15:01:52 +03:00
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Documentation/Getting-Started/Configuration-Guide.md
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@ -574,6 +574,29 @@ Arguments for the query classifier. What arguments are accepted depends on the
particular query classifier being used. The default query classifier -
_qc_sqlite_ - supports the following arguments:
#### `query_classifier_cache_size`
If present, enables and specifies the maximum size of the query classifier cache.
If the query classifier cache has been enabled, MaxScale will, after a statement
has been parsed, store the classification result using the canonicalized version
of the statement as the key.
When the classification result for a statement is needed, MaxScale will first
canonicalize the statement and check whether the result can be found in the cache.
If it can, the statement will not be parsed at all but the cached result is used.
The configuration parameter takes one integer that specifies the maximum size
of the cache. The size of the cache can be specifed as explained [here](#sizes).
```
# 1MB query classifier cache
query_classifier_cache=1MB
```
Note that MaxScale uses a separate cache for each worker thread. So, the total
amount of memory used at most by the cache is obtained by multiplying the
size specified here, with the number the worker threads used.
##### `log_unrecognized_statements`
An integer argument taking the following values: