If your ATG sites include data in more than one language, there are two options for how to index this data in Oracle Endeca Commerce:
Index each language in a separate MDEX
Index all of the languages in a single MDEX
This chapter discusses how to configure the ATG indexing components to support each option. It includes these sections:
There are also differences in how querying works, depending on which indexing option you choose. See the Query Integration chapter for information.