Re: Planning migration to mdb

[Howard Chu <hyc@symas.com>]

Nick Milas wrote:
> Hi,
>
> We have a running openldap installation (2.4.39) - a single master -
> with cn=config and hdb backend.
>
> So, config has the branches:
>
> I know we must slapcat our data and slapadd it in mdb afterwards.
>
> The question is: what changes should be done in the config DIT (and how)
> so that the config changes from hdb backend to mdb backend?
>
> Is it enough to slapcat config, then change:
>
>      olcDatabase from {1}hdb to {1}mdb
>
> and:
>
>      objectClass from olcHdbConfig to olcMdbConfig
>
> ...?

That's a start.

> Anything else?

> Can we safely delete all values of the olcDbConfig attribute which
> originate from converting from "DB_CONFIG"?

Not only *can you* - you *must*.

> What attributes can we safely remove?

Read the schema definition of the olcHdbConfig objectclass, and compare it to 
the definition of the olcMdbConfig objectclass. Delete anything that isn't 
present in the olcMdbConfig objectclass.

The schema has everything you need to know. Use it.

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