maria-discuss team mailing list archive

[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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