Re: Does a LMDB database file ever shrink, after row deletion, if so when?

[Howard Chu <hyc@symas.com>]

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/