Date: Tue, 22 Jun 2004 08:31:34 -0400 From: Bill Moran <wmoran@potentialtech.com> To: Jan Grant <Jan.Grant@bristol.ac.uk> Cc: questions@freebsd.org Subject: Re: [OT] Re: What's the best possible email failover solution Message-ID: <20040622083134.4b8e28df.wmoran@potentialtech.com> In-Reply-To: <Pine.GSO.4.58.0406221039470.8600@mail.ilrt.bris.ac.uk> References: <20040621132006.2b1a296f.wmoran@potentialtech.com> <a22ff294040621115173bad2e0@mail.gmail.com> <20040621172520.3544d6fe.wmoran@potentialtech.com> <20040621214348.GB63857@happy-idiot-talk.infracaninophile.co.uk> <20040621175626.3e762448.wmoran@potentialtech.com> <40D76DA3.9090809@mac.com> <20040621204111.6e684d45.wmoran@potentialtech.com> <Pine.GSO.4.58.0406221039470.8600@mail.ilrt.bris.ac.uk>
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Jan Grant <Jan.Grant@bristol.ac.uk> wrote: > On Mon, 21 Jun 2004, Bill Moran wrote: > > > During my research of the IMAP protocol, I determined that _the_best_ > > way to store email for high-performance would be to put them in a > > database. This is because IMAP doesn't see email as a big blob of > > text like POP does. It sees the headers as one thing, and the > > different MIME parts of the email each as a seperate thing that can > > be fetched independently of the other MIME parts. This is a pretty > > good layout for a one -> many relationship in a database. Fact is, > > every current IMAP server that I'm aware of has to break emails > > apart on the fly in order to server IMAP. > > Have a closer look at the cyrus layout. Each message is in a single > file, true, but they are also preparsed to extract the data required for > common IMAP operations. The index files contain things like preformed > bodystructure responses and offsets to each mime piece. That would explain why Cyrus is so fast then. If only there was a way to do replication ... it'd be the perfect IMAP server. -- Bill Moran Potential Technologies http://www.potentialtech.com
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