Date: Fri, 4 Dec 2020 02:17:54 -0600
From: Justin Pryzby <pryzby@telsasoft.com>
To: aditya desai <admad123@gmail.com>
Cc: pgsql-performance@lists.postgresql.org
Subject: Re: Pg_locks and pg_stat_activity
Message-ID: <20201204081754.GA7761@telsasoft.com>
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On Fri, Dec 04, 2020 at 01:31:14PM +0530, aditya desai wrote:
> Hi Justin,
> Many thanks for your response. Please see my response below.
> 
> What do you mean by API ?  If it's a different client, how does it connect ?
> Queries are getting called from Web UI built in Microservices spring boot.
> It connected to Database with JDBC driver. Developers have handled
> connection pooling at the Application side.
> 
> What db driver ?
> 
> Driver is JDBC

I suspect JDBC is using parameterized queries (postgres $1, $2, ..) and psql
isn't (unless you type "prepare p AS SELECT ..." and execute p(.., .., ..)"

You can search and find other people who reported similar issues.
https://www.postgresql.org/message-id/flat/A737B7A37273E048B164557ADEF4A58B50FB8D5E%40ntex2010i.host.magwien.gv.at
https://www.postgresql.org/message-id/flat/20200504191201.GU28974%40telsasoft.com

I don't know what server version you have, so I don't know whether to suggest
testing with plan_cache_mode=force_custom_plan

-- 
Justin