[Phpmyadmin-devel] testing master on a server with many databases

Marc Delisle marc at infomarc.info
Mon Oct 20 14:06:55 CEST 2014

Madhura Jayaratne a écrit :
> Hi Marc,
> On Sun, Oct 19, 2014 at 5:34 PM, Marc Delisle <marc at infomarc.info> wrote:
>> Hi,
>> With current master (8785ea0) I made some tests on a MySQL 5.5.37 server
>> containing about 81000 databases and about 81000 users.
>> In the mysql.db tables there are about 81000 grant entries; each one
>> grants some wildcard access to databases starting with a certain pattern.
>> I tested with root, since the reports we got about the server being slow
>> seem to be occurring for root.
> In bug #4243 [1] the slowness was reported for unprivileged user. Can you
> also test this scenario?

Yes, and it's not pretty. A user having a wildcard privilege (for 
example on db1\_%) has to wait 2 min 15 seconds after login, to see the 
navi and main panel for his db named "db1_".

Not sure why, but after opening the db, browsing the first table took 65 
seconds (this is MyISAM). After I have browsed one table, I can browse 
the other tables in the db (they are the same size) quickly.

If I logout/login, the browsing slowness is back (just for the first table).

>> Good news
>> ---------
>> First, the login. It takes about 7 seconds before seeing the initial
>> page after login.
>> In the navi panel, there is a db page selector with 107 page numbers.
>> Going to any page takes about 7 seconds. Opening a db takes about 4
>> second (each db seems to contain about 31 tables).
>> Browsing tables, grid editing, searching inside a table behave normally.
>> Using Server > Databases works correctly, including switching pages.
>> Great!
> I saw a couple of queries we can avoid when loading the navigation panel.
> I'll be working on them today
>> Problems
>> --------
>> Going to a MyISAM table, Structure, and trying to change a column's
>> structure takes 30 seconds before seeing the dialog for this column.
>> Switching this table to InnoDB does not help.
>> Database filter: I got mixed results. Sometimes it works (after about 10
>> seconds) but sometimes it stalls and does not find anything. I could not
>> find a consistent way to reproduce.
>> Server > Users: "Error in processing request. Error code: 500. Error
>> text: Internal server error".
>> I'll try to recreate these issues in my environment and update you all on
> the progress.
> Did you perform these test on the server provided by JM? It would be great
> if I can would get access to that, so I can test my commits immediately.

Yes, it would be great.

> Btw, does this server functions as our demo, automatically updating to new
> commits?


> Were all these tests done with grouping enabled in the navigation? I'm
> quite interested in seeing how the performance would be when the it is
> disabled.

I have no access to config.inc.php.

> [1] https://sourceforge.net/p/phpmyadmin/bugs/4243/

Marc Delisle (phpMyAdmin)

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