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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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2  
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
    
Are you running a Java application? Using HikariCP, or maybe another connection-pooling option? I'm using HikariCP and seeing a similar thing when I log into psql and do select query from pg_stat_activity;... I was also wondering why this is occurring; my guess is this is a mechanism by which HikariCP keeps connections "fresh". – Chris W. Jan 16 at 19:22

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