Re: Problems with system locking
Brian O'Donnell wrote:
...
> If system locks are indicated in SHOW
> PROCESSLIST when the system is flushing its key
> cache, and there are multiple threads trying to
> write to the same table (as is the case in our
> setup) then are they explained as contentions
> between the various INSERT statements?
Yes. This is my opinion.
> ie: one
> INSERT ends and starts flushing the key cache but
> while that happens, the next INSERT is trying to
> execute but can't because the key cache is being
> flushed???
Exactly.
> However if this is the case, I still
> don't see why the locks should cause a significant
> degradation in performance, which appears to be
> the case.
I agree. This looks odd.
> Anyway, here are the output traces from
> myisamchk...
I agree that the maximum table size is big enough for you. There should be no size problems for you. Also I don't see other possible problems with it.
Did I mention the option to use MERGE tables to you? Regularily adding a new table "at the end" and dropping the front table?
Regards
Ingo Strüwing, Senior Software Developer - Storage Engines
MySQL AB, www.mysql.com
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Re: Problems with system locking
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