[R] my RMySQL connections are so SLOW

[Ernesto Jardim]

On Mon, 2003-05-05 at 11:03, Laurent Faisnel wrote:
> Ernesto Jardim wrote:
> 
> >On Mon, 2003-05-05 at 09:56, Laurent Faisnel wrote:
> >  
> >
> >>Hi all,
> >>I'm using the latest RMySQL to send requests to a MySQL database (which 
> >>is quite small for the time - let's say 20 tables with a total of 1000 
> >>rows), and this should be part of a whole decisionnal system. It 
> >>produces results which are displayed on a website, and therefore I need 
> >>fast results (the database being quite small, I think this must be 
> >>possible !).
> >>Unfortunately, a simple request to the database, and R needs more than 
> >>10 seconds. Even dbListTables() takes a long while. Imagine the problem 
> >>with more data ! Can I hope something better  with RMySQL ? Did anyone 
> >>have the same problem ?
> >>If RMySQL (or is it MySQL's fault ?) is so slow, I could replace MySQL 
> >>with Postgres, but this would imply a lot of extra work. R is perhaps 
> >>very slow anyway ? Any piece of advice ?
> >>Thanks.
> >>Laurent
> >>
> >>______________________________________________
> >>R-help at stat.math.ethz.ch mailing list
> >>https://www.stat.math.ethz.ch/mailman/listinfo/r-help
> >>    
> >>
> >
> >Hi
> >
> >Have you tried to run the sql statement in mysql to check if the problem
> >is really in RMySQL ? MySQL databases can be very slow if you don't
> >index the tables. 
> >
> >Check
> >http://www.mysql.com/documentation/mysql/bychapter/manual_MySQL_Optimisation.html#MySQL_indexes
> >
> >Regards
> >
> >EJ
> >
> >
> >  
> >
> I'll try at once. My tables are not indexed. But I thought this could 
> not explain everything. Anyway, a few tests will be profitable. Thanks
> 

I've had some surprises with table indexing ... The documentation says
it can be 100 times faster!

Regards

EJ