Error: sorry, too many clients already

Question

I am using PostgreSQL in my NodeJS backend service. All of sudden, when I start the service I am facing below error

 connection error error: sorry, too many         


        

Answer 1

below query will help you.

select max_conn,used,res_for_super,max_conn-used-res_for_super res_for_normal 
from 
  (select count(*) used from pg_stat_activity) t1,
  (select setting::int res_for_super from pg_settings where name=$$superuser_reserved_connections$$) t2,
  (select setting::int max_conn from pg_settings where name=$$max_connections$$) t3