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The title is misleading. The post only talks about Amazon's RDS which is not Postgres.

Amazon RDS is the managed version of Postgres (among other flavors of relational DBs). Maybe you are confusing it with Redshift.

Redshift is based on PestgreSQL, but is vastly different. Redshift is a columnar store, and can't do things like create indexes. http://docs.aws.amazon.com/redshift/latest/dg/c_SQL_commands...