DB connection issue suggestions

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Dear All,

We have recently upgraded Postgresql 9.4 standalone server to Postgresql 11.2 with High Availability (2 servers : Master and 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 = 100 and the applications worked fine.

Regards,
Guna

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