Re: flatcurve index size (10x larger than lucene)

Aki Tuomi via dovecot <[email protected]> Thu, 14 May 2026 23:45:34 +0300 (EEST)

Newsgroups	gmane.mail.imap.dovecot
Message-ID	<599602422.7891.1778791534440@appsuite-pro-sync-core-mw-groupware-1.appsuite-pro-sync-core-mw-hazelcast-headless.appsuite-dev.svc.cluster.local>

> On 14/05/2026 23:21 EEST Jean-Daniel Beaubien via dovecot <[email protected]> wrote:
> 
>  
> Hi everyone,
> 
> I am currently trying to update from an old dovecot 2.3 setup with
> fts-lucene to 2.4.2 with fts-flatcurve.
> 
> However, I am seeing a giant jump in the size of the indexes.
> 
> For an email account that takes 12GB of storage, I get the following index
> sizes:
> 
>    - lucene: 270 MB
>    - flatcurve: 2400 MB
> 
> 
> That is almost a 10x increase in the index size (with flatcurve the indexes
> represent 20% of the size of the mailbox).

Hi!

You have substring search enabled, that will incur a larger size as those substrings need to be indexed somewhere.

Aki

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