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 : 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 = 100and the 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
