Actually this just is the impression I got reading this list. I read a lot about running out of memory, having rebuild the databases as they grow out of bounds, having a database size three time the data size, lock-ups, and all the stuff. I'm not spreading FUD. I'm just worried from what I read here.
You are spreading FUD because you literally have no idea what you're talking about. Get some experience with back-mdb vs back-hdb/bdb. back-mdb does fragment. So do back-bdb & back-hdb. Outside of some issues when back-mdb was brand new, I've not had the corruption issues with it that I continually had with back-bdb/hdb. Additionally there are a number of known bugs in BDB and back-bdb/hdb themselves (particularly around cache misses) that simply do not exist in back-mdb.
--Quanah -- Quanah Gibson-Mount Product Architect Symas Corporation Packaged, certified, and supported LDAP solutions powered by OpenLDAP: <http://www.symas.com>