partitioning in a data warehouse environment

We have a data warehouse running on version 11.1.0.7.  Our fact tables 
contain anywhere from 4 million to 41 million records.  We now want to 
partition some of the bigger, most frequently hit tables for both 
performance and maintenance.  I'm new to partitioning so I'm spending time 
analyzing the queries that are run against the tables and I have a good 
idea on how to partition each table. 
My question is regarding indexes.  I know that there are both local and 
global but I'm unsure when to use each.  It's my understanding that a 
local index only contains information for the records in one partition and 
a global has information about the records in the entire table, correct? 
Are there some guidelines as to when to use each type?

Thanks,
Sharon
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