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I have 1 DB called - DB_A. I would like to create read only database DB_B from DB_A which updates itself every 10 mins. Is their any easy way to do it in postgres? I am using Postgres 11. Also any data deleted from DB_A should get removed from DB_B on next update.

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It sounds like you want the recovery_min_apply_delay option of streaming replication.

This will give you a rolling 10 minute window, not a leaping window.

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