samba-tool ldapcmp hangs when too much objects in Samba database

Jeremy Allison jra at
Tue Nov 3 23:50:03 UTC 2015

On Wed, Oct 28, 2015 at 02:17:55PM +0100, mathias dufresne wrote:
> Hi all,
> samba-tool ldapcmp always hangs when database contains too much object.
> This happened to me only when checking "domain" using that tool, most
> certainly because I have very few objects in others contexts.
> The limit seems to be around 40 000 objects. That limit was defined by
> running samba-tool ldapcmp on a new domain on which I pushed users by
> bunches of 500 users, until the command refuse to finish successfully.
> As a workaround an option is to avoid containers with more than a certain
> amount of object, with this amount less than 40 000, then to proceed with
> ldapcmp on each container declared in AD with a scope equal to "one", to
> not check this containers recursively.
> The main bad point of this workaround is time needed to compare the whole
> tree. This tool is already needing an amount of time relatively important
> to succeed, I don't expect launching it once on each AD container to be
> something which would accelerate that process.
> I fully understand that kind of issue only happen for big company which
> have enough objects to include in AD and I totally agree that kind of
> company which is big enough can raise funds to help open source software to
> be developed when they need some improvement.
> So I asked the company I'm working for to raise funds and they are
> discussing internally for months now about that funds raising, things are
> going further, but very slowly.
> So the question is the following: did someone have noticed such an issue
> and/or did someone have an idea on how to improve that?

Do you have more data on exactly what in Samba is failing in this case ?

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