[Phpmyadmin-devel] Innodb and row exact count

[Marc Delisle]

Le 2013-06-12 17:04, Marc Delisle a écrit :
> Le 2013-06-12 03:23, Michal Čihař a écrit :
>> Hi
>>
>> Dne Tue, 11 Jun 2013 13:20:44 -0400
>> Marc Delisle <marc at infomarc.info> napsal(a):
>>
>>> I don't find a winning solution so I'm seeking for advice. In this bug
>>> report [0], we see that it's annoying to have incorrect page navigation
>>> (page selector and arrows) for InnoDB.
>>>
>>> However, when I apply my proposed patch (which forces an exact count in
>>> sql.php), I see delays for larger InnoDB tables.
>>>
>>> For example, on MySQL 5.5.31, the first time I browse a table having one
>>> million rows, I wait for 9 seconds. I tried with 0.5 million and it was
>>> about 5 seconds. A few minutes afterwards, even after closing the
>>> browser, my big table starts to display in two seconds.
>>>
>>> I tend to find these delays acceptable and I propose to apply my patch.
>>
>> I agree this is acceptable and agree with the patch for 4.0.4.
>>
>> For 4.1 I'd go even further - drop MaxExactCount and use only not exact
>> counts on overview pages and count properly when browsing.
>
> Thanks, I'll have a look at this suggestion for 4.1.
>
>

Hmmm, I think we have a problem with exact counting, see
https://sourceforge.net/p/phpmyadmin/bugs/4027/

It's true that 750 M rows is a lot of rows...

-- 
Marc Delisle
http://infomarc.info