On Wed, Oct 26, 2011 at 10:18 PM, Platonides <platoni...@gmail.com> wrote:
> Marlen Caemmerer wrote:
>> Rosemary (one of the enwiki-DB-Hosts) seems to bring the maximum of the I/O 
>> that is possible, disk graphs are clipping there.
>> In the MySQL traffic graph you can see there is clipping too.
>> Strange thing about this is that this phenomenon started in the middle of 
>> september. Can anyone remember any important change in this time?
>> That is not the case with thyme (other enwiki DB Host) so it'd be a question 
>> wether we could share the load better.
>> Also I enabled query caching and will see if this is useful in any way.
>
> Maybe there's some job/tool which started at that time which loaded
> rosemary so much?

In the last three hours, I got no less than 21 immensely useless mails
from the query killer. The following query, apparently, was killed
after running for a whooping 71 minutes:

SELECT /* SLOW_OK */ /* GLAMOROUS */
gil_wiki,gil_page_title,gil_page_namespace,gil_to from
globalimagelinks,page,categorylinks where gil_to=page_title and cl_to
="Images_from_the_National_Archives_and_Records_Administration" AND
page_id=cl_from AND page_namespace=6 AND gil_page_namespace=""

This queries, and others like it, have not caused problems for the
last one (two? I can't remember) years they've been in place.
Something has changed for the far, far worse.

Magnus

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