[Phpmyadmin-devel] Minimum MySQL version

Rouslan Placella rouslan at placella.com
Thu Oct 24 21:59:03 CEST 2013

On 10/24/2013 08:28 PM, Marc Delisle wrote:
> Marc Delisle a écrit :
>> Michal Čihař a écrit :
>>> Hi
>>> Dne Thu, 24 Oct 2013 08:15:48 -0400
>>> Marc Delisle <marc at infomarc.info> napsal(a):
>>>> For the upcoming phpMyAdmin 4.1, we currently advertise the minimum 
>>>> MySQL version to 5 (meaning 5.0). However, MySQL 5.0 has reached "End of 
>>>> Product Lifecycle".
>>>> Moreover, we have a performance problem in phpMyAdmin 4.0 and 4.1, due 
>>>> to the navi panel mostly using INFORMATION_SCHEMA, which is poorly 
>>>> implemented in older MySQL versions. This performance problem is seen on 
>>>> servers with many (thousands?) of databases, which is not uncommon for 
>>>> host providers. We have bug tickets about this.
>>>> By the way, using INFORMATION_SCHEMA helps us for some features like the 
>>>> db filter (now with REGEX). I'm not sure how we could implement this 
>>>> efficiently with SHOW DATABASES.
>>>> I would like to increase the minimum MySQL version for phpMyAdmin 4.1. I 
>>>> got feedback from someone I trust, who is running MySQL 5.6 with 
>>>> thousands of real-world databases and did some tests; on this version, 
>>>> INFORMATION_SCHEMA performs ok.
>>> When trying to google this, I've found following hint on improving IS
>>> performance, have we tried to use that?
>>> http://www.mysqlperformanceblog.com/2011/12/23/solving-information_schema-slowness/
>> I was not aware of that setting; but from the comments on this page:
>> "the innodb_stats_on_metadata variable is available since MySQL 5.1.17, 
>> and it’s a dynamic variable only since InnoDB Plugin 1.0.2."
>>>> If the team agrees, I would do some testing to find out at which point 
>>>> INFORMATION_SCHEMA's fetch problems were fixed. Then we would advertise 
>>>> this MySQL version as the minimum, and use only INFORMATION_SCHEMA in it 
>>>> (no more SHOW DATABASES).
>>> Makes sense (and we could then also drop DisableIS configuration...).
>> This, and ShowDatabasesCommand.
> I have a test server on Linux, with MySQL 5.1.71, 1000 databases with 
> 100 tables in each db (all InnoDB). PHP 5.5.3 + mysqli + mysqlnd.

How many records per table have you got? I guess that the amount of data
may have an influence here.

> With phpMyAdmin 4.0.8, I don't have a performance problem. Both my root 
> user, which happily paginates between all the dbs, and a normal user 
> with access to only one db, work well.
> I'm using the default DisableIS setting of true. I also tried 
> ShowDatabasesCommand set to false + some names in only_db, and all was fine.
> I have asked in the bug tickets for more details, to be able to 
> reproduce the performance problems.
> I am not testing with MySQL 5.0.x, because for phpMyAdmin 4.1 we should 
> mention that the minimum version is (at least) MySQL 5.1.

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