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List:       openldap-devel
Subject:    Re: Does a LMDB database file ever shrink, after row deletion, if so when?
From:       Howard Chu <hyc () symas ! com>
Date:       2015-05-23 19:46:54
Message-ID: 5560D92E.7080907 () symas ! com
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Tinker wrote:
> Hi!
>
> Is there any mechanism in LMDB to give back disk space after some particular
> amount of row deletion, how does this work, if not are there any plans for it
> now?

No. LMDB keeps all space and reuses it for future write operations.

> If there's not, as a user I need 2x disk space and some mechanism to be able
> to migrate, so automatic shrinking would be a great thing.

There's nothing automatic but you can use mdb_env_copy() to implement your own 
strategy.

-- 
   -- Howard Chu
   CTO, Symas Corp.           http://www.symas.com
   Director, Highland Sun     http://highlandsun.com/hyc/
   Chief Architect, OpenLDAP  http://www.openldap.org/project/

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