From: Albert Wagner <alwagner@...>
Date: 2002-08-07T22:46:28+09:00
Subject: Re: Assoc Class (Hash Pairs)

On Tuesday 06 August 2002 07:02 pm, Charles Hixson wrote:
<sniip>
> That sounds like a balanced tree to me.  I think I saw a Ruby
> implementation of an AVL tree, but you might consider just how much effort
> you want to engage in.  Personally, I wish that Ruby had a built-in B+Tree
> implementation, or even an ISAM implementation, but when I look at the work
> involved, I keep on putting off doing anything about it.

I saw a B-Tree module in RAA.

>
> Still, if you've got a large file, then you might check out how SleepyCat
> db looks.  They provide a B+Tree based file and I'm pretty sure I saw an
> interface to it in the RAA.  It's disk based, so it's probably not worth it
> for a small file, but if you have a file whose size is pushing memory
> anyway, it might be your best choice.  N.B.:  They make provision for
> accessing the data by record number, but they make no provision for
> maintaining multiple keys, so if you need to do that, you'll probably need
> to roll the interface yourself.

Yes, bdb is cool.