[Dovecot] dovecot.index is missing

Alexandr Sabitov alexandr.sabitov at netregistry.com.au
Wed Jan 30 00:26:57 EET 2013

Timo and Stan,

thank you very much for the explanation :)
Wish you a good day !

Alexandr Sabitov
From: dovecot-bounces at dovecot.org [dovecot-bounces at dovecot.org] on behalf of Timo Sirainen [tss at iki.fi]
Sent: Wednesday, January 30, 2013 3:02 AM
To: dovecot at dovecot.org
Subject: Re: [Dovecot] dovecot.index is missing

On Tue, 2013-01-29 at 03:37 -0600, Stan Hoeppner wrote:
> On 1/29/2013 1:37 AM, Alexandr Sabitov wrote:
> > Dear All,
> >
> > I have noticed that dovecot.index is not generated straight away if you have just a few emails in the mailbox. Instead of that dovecot.index.log is modified and accessed by clients.
> >
> > Only if the number of email reaches some level then it creates dovecot.index in user mailboxes.
> >
> > Can somebody please tell me when (in my understanding of the process) the index log file drops all data into the mail index file. What does trigger that ?
> > Sorry I couldn't find any info on that in the wiki.
> Dovecot is behaving here as designed.   You haven't found the technical
> answer because there is no configurable variable for this behavior--it's
> hard coded.  Thus it is not documented.
> The layman's explanation is this:  up to a certain amount of mail it is
> more expensive to create the index than to simply read the mail.  Beyond
> that point indexing has benefit.  To understand how that decision is
> made requires reading the source, and understanding it.

The index still exists. It's just that for new mailboxes the
dovecot.index.log file contains everything that is necessary to create a
dovecot.index file, and Dovecot just hasn't gotten around to actually
creating it. If a mailbox shrinks enough, the dovecot.index file could
in theory be deleted as well (and maybe in future Dovecot version it

So dovecot.index is just a snapshot that gets updated every once in a
while. http://wiki2.dovecot.org/IndexFiles and
http://wiki2.dovecot.org/Design/Indexes has some more details, although
they don't seem to talk about this exact thing.

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