Google Search Indexing Tiers

In addition to the language indexing diversity, Gary Illyes from Google said in the Search Off the Record podcast that Google uses different indexing tiers. He said the search company "might use different kinds of storages to build the index." Some of the index goes on cheaper storage and some go on more expensive storage to be served and accessed faster.

from Search Engine Roundtable https://ift.tt/3iGjI1X