As Magento releases 2.X version, I found
_replica tables, particularly in the
Magento_Catalog module may be for indexing the catalog data.
I also notice that
_replica is nothing but the duplicate structure of the respective table in database nature but it means a lot for Magento 2 framework for read and write operational activities I guess.
I want to know that which operations Magento 2 application will consider for
_replica tables for