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slapadd speed


I am new to openldap and I am trying to use it for 50 million records. I am using slapadd to add this data but it is processing around 1 million records in 5 hour. So this will take days to stage properly. I will have to update database every 20 days with about 10 million records. I wish to know what enhancements I have to do in my setup considering following configurations.
I am using openldap 2.4.16 with Berkley DB 4.5.20 on CentOS linux OS 32 bit machine with 4GB RAM.
slapd.conf :

include /usr/local/etc/openldap/schema/core.schema
include /usr/local/etc/openldap/schema/xyz.schema

pidfile /usr/local/var/run/slapd.pid
argsfile /usr/local/var/run/slapd.args

backend bdb

database bdb
suffix "o=sgi,c=us"
rootdn "o=sgi,c=us"
checkpoint 128 15

rootpw xyz

directory /usr/local/var/openldap-data

index objectClass eq
index attribute1 eq
index attribute2  eq

set_cachesize 1 268435456 1

Ashok Kumar