Invalidating query cache entries mysql By chat no membership no payment no sign up sex sites

You can access the patch from: 2742 Kristofer Pettersson 2008-10-27 Bug#38551 query cache can still consume [very little] cpu time even when it is off.

By using the command line option --query_cache_type=0, the user can disable the query cache permanently and avoid taking the query cache mutex. After review, it may be pushed to the relevant source trees for release in the next version. After review, it may be pushed to the relevant source trees for release in the next version.

By first projecting the character representation of the variable to a temporary integer we can have one function instead of two to check if the value is valid.

@ sql/share/errmsg-utf8* Added error message for query cache disabled state @ sql/sql_* If the query cache is disabled at start up, shorten the execution path and avoid grabbing the query cache mutex each time the invalidate interface methods are called.

You can access the patch from: 2917 Kristofer Pettersson 2008-11-07 Bug#38551 query cache can still consume [very little] cpu time even when it is off.

By using the command line option --query_cache_type=0, the user can disable the query cache permanently and avoid taking the query cache mutex.

The current code actually locks/unlocks the query_cache lock twice when the query_cache_size is zero! This can all be bypassed if the check for query_cache_size is done without holding the QC lock as in Query_cache::store_query The CPU time wasted is very less, however, in benchmark situations, every cpu cycle counts.

At this time there is no plan to backport the fix to a stable release as it changes the behavior of the query_cache_type command line option.

Also, if query cache is not used at all, one can build (or request a build) with query cache disabled (see --without-query-cache).

When the query cache is disabled, the server shouldn't attempt to take the query cache mutex.

By using the command line option --query_cache_type=0, the user can disable the query cache permanently and avoid taking the query cache mutex. After review, it may be pushed to the relevant source trees for release in the next version.

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