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Re: (ITS#7210) back-mdb endless database growth
> quanah@OpenLDAP.org wrote:
>> Full_Name: Quanah Gibson-Mount
>> Version: 2.4.30
>> OS: Linux 2.6
>> URL: ftp://ftp.openldap.org/incoming/
>> Submission from: (NULL) (126.96.36.199)
>> If you create a script to add& delete the same 50,000 users, and then re-run
>> that script multiple times, the MDB database on disk continues to grow, despite
>> the fact that we are only adding and deleting the same data repeatedly. There
>> should be zero growth to the database.
>> Instead, the data.mdb file went from 108MB in size to over 1.2GB after 5-6 runs.
>> Time to add/delete all the users went from 3 minutes 32 seconds on the first
>> run to over 90 minutes on the final run (5th or 6th, I lost count).
> At present, MDB is working as intended. In your test a number of overflow
> pages are being used. Currently libmdb always allocates overflow pages from
> new space, because it's not smart enough to search the free list for
> contiguous pages. Can treat this ITS as an enhancement request for that
> purpose, but this is not a new issue nor is it unexpected in the current
> version of MDB.
Hm, I take this back. The overflow pages are not enough to account for the
difference. Still looking.
-- Howard Chu
CTO, Symas Corp. http://www.symas.com
Director, Highland Sun http://highlandsun.com/hyc/
Chief Architect, OpenLDAP http://www.openldap.org/project/