Re: Guidance on avoiding session pinning with psqlODBC and RDS Proxy - Mailing list pgsql-odbc

Here is the RDS documentation for this:

https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/rds-proxy-pinning.html

There was mention by OP of using InitQuery, but my understanding is that as long as the driver makes the set call that the pinning will happen regardless of what state the connection is currently in. My research also showed that the show command should not have affected the pinning.

Jon

 

From: Dave Cramer <davecramer@postgres.rocks>
Date: Monday, November 17, 2025 at 12:13 PM
To: Neeta Ghadge <Neeta.Ghadge@amdocs.com>
Cc: pgsql-odbc@postgresql.org <pgsql-odbc@postgresql.org>
Subject: Re: Guidance on avoiding session pinning with psqlODBC and RDS Proxy

Ah,

OK, I will have to change the driver. I think that is doable. 

Can you create an issue here https://github.com/postgresql-interfaces/psqlodbc

Dave Cramer

www.postgres.rocks

On Mon, 17 Nov 2025 at 11:52, Neeta Ghadge <Neeta.Ghadge@amdocs.com> wrote:

Hi,
Thank you for your prompt response.
It’s not SHOW command, rather it is SET that is causing session pinning. I will try to find alternate approaches to avoid session pinning.

 

 

Thanks and Regards,

Neeta Ghadge

 

From: Dave Cramer <davecramer@postgres.rocks>
Sent: Monday, November 17, 2025 10:14 PM
To: Neeta Ghadge <Neeta.Ghadge@amdocs.com>
Cc: pgsql-odbc@postgresql.org
Subject: Re: Guidance on avoiding session pinning with psqlODBC and RDS Proxy

 

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Hi,

 

Neeta,

 

Talking to some folks at Amazon, they don't think it should pin. Can you open a ticket with them?

 

Dave Cramer

www.postgres.rocks

 

 

On Mon, 17 Nov 2025 at 11:21, Dave Cramer <davecramer@postgres.rocks> wrote:

Hi Neeta,

 

I'm curious why RDSProxy is pinning on this. I can't think of any reason to pin on a SHOW

That said, I'm equally curious why psqlODBC is doing it, it doesn't really need to know the transaction isolation level

 

Dave Cramer

www.postgres.rocks

 

 

On Mon, 17 Nov 2025 at 05:19, Neeta Ghadge <Neeta.Ghadge@amdocs.com> wrote:

Hi,
We are currently using PostgreSQL 16.5 with the ODBC driver (psqlodbcw.so version 17.00.0006) in an environment that relies on Amazon RDS Proxy.

We have observed that the driver automatically issues the following SQL statements at connection startup:

SET DateStyle = 'ISO';

SET extra_float_digits = 2;

SHOW transaction_isolation;

 

While harmless in most cases, these queries cause AWS RDS Proxy to pin sessions, which reduces pooling efficiency. We can neutralize the SET commands using RDS Proxy’s InitQuery feature, but SHOW transaction_isolation still forces pinning.

 

Could you please suggest recommended ways to handle this scenario when using psqlODBC with RDS Proxy? Specifically, are there configuration options or best practices to avoid or minimize session pinning while still maintaining ODBC compliance?

 

Thank you for your guidance.

 

 

Thanks and Regards,

Neeta Ghadge

 

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