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I am using PostgreSQL server for my production use.

When I fire a query like

select * from pg_stat_activity

on my server, I am getting 98% of queries like

SHOW TRANSACTION ISOLATION LEVEL

and my server accepts only 100 connections, so I am not able to proceed further.

Why is this happening? How can I block all these queries?

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Postgres doesn't create connections by its own. It's your application that creates those connections and runs those queries. Possibly a connection pool or something similar. –  a_horse_with_no_name Sep 10 '13 at 9:03

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