Updating the Active directory

Question

I have a requirement to update certain properties (like company, physicalDeliveryOfficeName, info, homephone, Pager, mobile, telephoneNumber, department, ipPhone) of employees in Active Directory (LDAP).
There are more than 100,000 employee records in active directory and the value for the above mentioned properties are available in SQL database. If I try to do iteration for each employee in Active Directory then it may take hours together.
Please suggest best possible solution to update the employees AD property from SQL databas.