Dear team, Can you confirm whether, post upgrade activity, all the post-upgrade steps including stats update on all the relations is complete. Upgrade doesn’t carry over the stats to the new upgraded cluster. Regards, Anbazhagan M > On 11-May-2022, at 11:43 AM, Laurenz Albe <laurenz.albe@xxxxxxxxxxx> wrote: > > 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 > >
