maria-discuss team mailing list archive

[Roberto Spadim <roberto@xxxxxxxxxxxxx>]

nice, now one question...
what about views? how many columns?
what about spider engine with vertical partition? how many columns?

2014-01-30 Reindl Harald <h.reindl@xxxxxxxxxxxxx>:
> http://dev.mysql.com/doc/refman/5.5/en/column-count-limit.html
>
> normally you have a serious problem if you reach that limits
> because it won't scale well and the scheme is at least
> questionable
>
> select(*) even with most empty will create large results
> inserts/updates are much slower
>
> Am 30.01.2014 18:50, schrieb Roberto Spadim:
>> hum, unireg is the "global" limit, there's some ideas to change the .frm file and create a better one with less
>> limits (drizzle database have it done), but you have limits in each engine too, index size have limits, many limits
>> per engine exists, i think a max columns is just more one
>>
>> how many columns you need? i think it's the best question, after that select a engine, if it's not a good engine,
>> create many tables and use spider engine to group all tables (vertical partition) ?
>>
>>
>> 2014-01-30 Adam Scott <adam.c.scott@xxxxxxxxx <mailto:adam.c.scott@xxxxxxxxx>>:
>>
>>     I believe it's the same as in MySQL.  It does depend on the engine your table is using.  By default it is
>>     probably InnoDB.
>>
>>     For the full details about the limits:
>>     http://www.mysqlperformanceblog.com/2013/04/08/understanding-the-maximum-number-of-columns-in-a-mysql-table/
>>
>>
>>
>>
>>     On Thu, Jan 30, 2014 at 9:45 AM, AskMonty KB <noreply@xxxxxxxxxxxx <mailto:noreply@xxxxxxxxxxxx>> wrote:
>>
>>         Hello,
>>
>>         A new question has been asked in "MariaDB FAQ" by robpaton:
>>         --------------------------------
>>         Hi there,
>>
>>         What is the maximum number of columns a row can have in MariaDB? I can't find this info anywhere on the web.
>>
>>         Best regards,
>>         Rob
>>         --------------------------------
>
>
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-- 
Roberto Spadim
SPAEmpresarial
Eng. Automação e Controle