Performance Tuning: Create index for boolean column

Question

I have written a daemon processor which will fetch rows from one database and insert them into another for synchronizing. It will fetch rows based on a boolean

Answer 1

I suggest that you do not index the table (the boolean is a low cardinality field), but partition it instead on the boolean value.

See: http://www.postgresql.org/docs/9.1/static/ddl-partitioning.html