Password Policy in OID

In general, establishing a password policy requires the following steps:

1) Create a password policy entry in the appropriate container and associate it with the pwdpolicy object. (Default entries exists when you first install Oracle Internet Directory.)
2) Create the desired policy by setting values for attributes defined under the pwdpolicy object class for the entry created in step 1.
3) Enable the policy by setting the orclepwdpolicynable attribute to 1. If this is not set to 1, Oracle Internet Directory ignores the policy.
4) Determine the subtree to be governed by the policy. Add and populate a pwdpolicysubentry attribute with the policy's DN, at the root of that subtree.

http://docs.oracle.com/cd/E25178_01/oid.1111/e10029/pwdpolicies.htm