mnesia query

Sebastian Bello <>
Thu Jul 14 19:01:25 CEST 2005


Regarding 2:

- and using select?
- is there any drawback to using different query languages in an application
to improve
performance?
    Sebastian-
----- Original Message -----
From: "Ulf Wiger" <>
To: <>
Sent: Thursday, July 14, 2005 1:47 PM
Subject: Re: mnesia query


> Den 2005-07-14 18:05:58 skrev Sebastian Bello <>:
>
> > We are using select. Ok, I'll check for that. Three more questions
> > (please
> > tell me if they have already been aswered in the list):
> >
> > 1- what are the options to get the result ordered by the key (in this
> > particular case)?
>
> The result is going to be in whatever order that the table
> is in. If it's an ordered set, you will have a defined order,
> otherwise not.
>
>
> > 2- is it possible to perform a query using two indexes?
>
> I think so, if you use mnemosyne.
>
>
> > 3- is there a guide from where to read about performance issues in
> > mnesia?
>
> Don't think so. There may be some words in the user guide,
> but it's been a while since I read it through.
> In the reference manual, some of the functions are described
> with performance issues highlighted.
>
> /Uffe
>
>





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