How to tune Red Hat Directory Server for faster large LDAP import and avoid an out of memory situation

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Issue

Depending on the hardware used, importing large LDAP data in Red Hat Directory Server may be slow, the process ns-slapd memory footprint may grow and create an out of memory error.

Environment

Red Hat Enterprise Linux 6

cat /etc/redhat-release ; uname -a
Red Hat Enterprise Linux Server release 6.2 (Santiago)
Linux ca1.example.com 2.6...

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