The note for the -w argument does not apply to back-mdb, since back-mdb uses an isolated snapshot of the database when performing the slapcat. Thus the out of order "hot change" issue does not apply (which is the problem with using -w with back-bdb/hdb).
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Quanah Gibson-Mount Product Architect Symas Corporation Packaged, certified, and supported LDAP solutions powered by OpenLDAP: http://www.symas.com