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Re: Large user bases cause huge number of roleOccupant in role organizationalRole

Dear Howard,

Good Morning from Switzerland. Thanks for your quick reply!

I am agree with you, the schema design is wrong from the beginning. I would like to change it from organizationalRole (static group) to "groupOfURLs + Dynamic Lists overlay" (dynamic group).

What are your opinions or suggestions for such a migration?

Best regards


On 24/03/17 20:25, Howard Chu wrote:
Huang Hongfu wrote:

In a general design, we have a role, which is an object of organizationalRole. Within this role, let us say it will have more than 10 million users. Each
user has a roleOccupant in the role object.

You can imagine how huge this role object can be! This will cause a big
performance problem. Especially with LMDB as backend, the "add new user" will become very slow at some point; and the replication will be very difficult
even we setup a delta (with accesslog and session log) replication.

From my point of view, organizationalRole is not designed for large user bases.

Or someone has a better idea?

The same logic as used in indexing applies here - it is stupid to define a case for something that matches the majority of your population. I.e., it's stupid to define a presence index on an attribute if that attribute occurs in the majority of your entries. It is stupid to define a group or role if the majority of entries will be a member of it. A presence index is only useful if the attribute occurs rarely. A group/role is only useful if the members are a minority of the total population.

In this case you should define a group/role for all users who *aren't* part of the majority.

Meanwhile, for people with stupid data models, performance with large attributes in back-mdb is greatly improved in OpenLDAP 2.5.


Hongfu Huang, Senior System Engineer
MSc in Computer Science

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