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Some improvements to Query Cache text (by Colin Faber).

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unknown 2001-12-12 18:04:40 +10:00
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Docs/manual.texi
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@ -34298,14 +34298,15 @@ Following are some performance data for the query cache
@itemize @bullet
@item
If you don't use the query cache (@code{query_cache_size=0}), there is
no notable overhead.
If want to disable the query cache code set @code{query_cache_size=0}.
By disabling the query cache code there is no noticeable overhead.
@item
If all queries are very simple (like selecting a row from a table with
one row) but still different so that the queries can't be cached, the
overhead for having the query cache active is 13%. This could be
regarded as the worst case scenario. In real life queries are much more
complicated than this so the overhead is normally significantly lower.
If all of the queries you're preforming are simple (such as selecting a
row from a table with one row); but still differ so that the queries can
not be cached, the overhead for having the query cache active is 13%.
This could be regarded as the worst case scenario. However, in real life,
queries are much more complicated than our simple example so the overhead
is normally significantly lower.
@item
Searches after one row in a one row table is 238% faster.
This can be regarded as close to the minimum speedup to be expected for