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Re: MySQL 5.6 update doubled IOs
Posted by: Dimitri Kravtchuk
Date: April 05, 2013 06:24AM

Hi Christian,

no, no need more test - Olav pointed out that MRR is used in your case because of the "read_rnd_buffer_size = 2M" setting (as the buffer is big, MRR has a lower cost), while I'm using a default value..

in any case, we all agree that for "LIMIT 1" case it looks like a bug, so should be fixed. (if you want you may log it yourself to be updated on changes (and just add a link to this forum thread)).

while for the initial issue with higher IO activity on 5.6 nothing is clear for me :-) so, if you can collect some stats with my own tools, then I'll probably say you more :-)

here is the howto:


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Re: MySQL 5.6 update doubled IOs
April 05, 2013 06:24AM
April 10, 2013 08:31AM

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