database types

[Simon Matter]

Iain Stevenson schrieb:
> 
> There has recently been a short discussion on the list about this - cones
> down to efficiency issues.  Not using db4 would seem also to eliminate
> warnings about "lockers".  I'd be more worried about migration issues from
> one sort of database to another.  Last time I tried modifying the database
> structure of my Cyrus installation I lost a considerable amount of mail.

I don't know about the Debian packages but as a maintainer of RPM
packages, I implemented some db converting mechanisms which will
automagically convert any dbs on the fly. I have used my own packages on
different servers and haven't had any problems. The good thing is that I
also didn't get any problem reports concerning the db conversion. Would
be nice to get some feedback from people who are using my rpms.

Simon

> 
>   Iain
> 
> --On Saturday, October 12, 2002 2:53 pm -0700 David Wright
> <ichbin at shadlen.org> wrote:
> 
> > Henrique, who maintains the Debian cyrus-imap packages (and does a very
> > good job of it) just changed the MBOX and SEEN databases to use skiplist
> > (from db3 and flat). I had never thought about this issue before.
> >
> > Can someone explain what advantages and disadvantages one has from the
> > different database types? And what is a skiplist anyway? I'm familiar
> > with flat files and the sleepycat databases, but I've never heard of a
> > skiplist.
> >