Ordered indices in Mnesia

Ulf Wiger (AL/EAB) <>
Wed Dec 14 11:00:37 CET 2005


 
Dave Smith wrote:
>
> I did see a post about compound indicies by Uffe:
> 
>
http://forums.trapexit.org:81/phpBB/viewtopic.php?t=4816&highlight=order
ed+index+mnesia
> 
> Uffe, are you still looking for testers? Would those indicies 
> help me out?


It seems like my hack is what you're asking for.
I will confess that my current line of thought is to 
move the custom index support into RDBMS instead.
Together with a couple of other enhancements of 
RDBMS, I think that will work out nicely.

I can't promise to have anything before Christmas, though
(I can almost promise not to.) If you want to play with the
hack I have right now, I would welcome the feedback.

/Uffe

> D.
> 
> On Dec 13, 2005, at 10:32 PM, Dave Smith wrote:
> 
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA1
> >
> > This may be a stupid question, but I just can't seem to find the 
> > answer. Is it possible to create a ordered index in mnesia? For 
> > instance, I want to do the SQL equivalent of:
> >
> > SELECT TOP 10 value FROM table
> >
> > ...which would be easy to accomplish if I knew that the "value"  
> > index was ordered.
> >
> > Am I missing something obvious?
> >
> > Thanks!
> >
> > D.
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