what to copy of bdb directory?

["Marco Parmigiani" <marco.par@libero.it>]

Hello everybody,

in order to replicate the existing openLdap db (berkeley) we just installed in our production environment on a number of slaves, I havo to perform step 13.4.4. of the admin guide: "Copy the master slapd's database to the slave". 
Since my data directory is very huge, I would like to know which files inside the openldap-data bdb directory I do actually need to copy. Inside the folder I see the following files:
*.bdb
__db.00?
log.*

Any advice would be much appreciated. Thanks in advance,

Marco