So, it is to say that VM package in XEmacs heavily used this kind of database backends? 
----- Original Message ----
From: Stephen J. Turnbull <stephen(a)xemacs.org>
To: FKtPp <m_pupil(a)yahoo.com.cn>
Cc: XEmacs Beta List <xemacs-beta(a)xemacs.org>
Sent: Sunday, November 18, 2007 2:58:21 PM
Subject: Question: what's the benifit of compile in database support?
FKtPp writes:
 Dear developers,
 
 As the subject said I have a stupid question, what is the advantages
 of compile in a database support like:
 
 --8<---------------cut here---------------start------------->8---
 Databases:
   Compiling in support for Berkeley database.
 --8<---------------cut here---------------end--------------->8---
 
 Can I use this in elisp scripts inside XEmacs, If so, how to use it? 
 
Yes.  As far as elisp is concerned it's basically just an external
(ie, on-disk) hashtable.  Since you have access to the BDB/dbm
functionality, you can tune it for the mind of access that's most
common.
The PostgreSQL support is much more powerful.
 Is there any documents/info pages describe this kind of usage?
Not really.  I believe that VM supports keeping information about the
summaries in a dbm or Berkeley db database.
     
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