Re: DB connection issue suggestions

On Wed, 2022-05-11 at 00:59 +0800, Sudhir Guna wrote:
> We have recently upgraded Postgresql 9.4 standalone server to Postgresql 11.2 with High Availability (2 servers :
Masterand Standby).
 
> 
> While trying to test using ETL applications and reports, we observe that the ETL jobs fails with below error,
> 
> 2022/05/06 16:27:36 - Error occurred while trying to connect to the database
> 2022/05/06 16:27:36 - Error connecting to database: (using class org.postgresql.Driver)
> 2022/05/06 16:27:36 - FATAL: Sorry, too many clients already
> 
> We have increased the max_connections = 1000 in postgresql.conf file.
> 
> It worked ok for a day and later we get the same error message.
> 
> Please help to advise on any additional settings required. The prior Postgresql 9.4 had the default max_connections =
100andthe applications worked fine.
 

Some application that uses the database has a connection leak: it opens new connections
without closing old ones.  Examine "pg_stat_activity" to find out which application is
at fault, and then go and fix that application.

Yours,
Laurenz Albe
-- 
Cybertec | https://www.cybertec-postgresql.com