Thank you.
Removing substring and revuilding the indexes worked.
The size iscnow similar to lucene, and approx 8x smaller than with
substring emabled.
Speed also seems 20%-30% faster when querying the text or body of email.
Thank you for the help.
On Thu, May 14, 2026, 4:45p.m. Aki Tuomi <[1][email protected]>
wrote:
> On 14/05/2026 23:21 EEST Jean-Daniel Beaubien via dovecot
<[2][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
References
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1. mailto:[email protected]
2. mailto:[email protected]
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