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(dot)Ghadge(at)amdocs(dot)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(at)postgres(dot)rocks>
> *Sent:* Monday, November 17, 2025 10:14 PM
> *To:* Neeta Ghadge <Neeta(dot)Ghadge(at)amdocs(dot)com>
> *Cc:* pgsql-odbc(at)postgresql(dot)org
> *Subject:* Re: Guidance on avoiding session pinning with psqlODBC and RDS
> Proxy
>
>
>
> You don't often get email from davecramer(at)postgres(dot)rocks(dot) Learn why this
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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(at)postgres(dot)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(dot)Ghadge(at)amdocs(dot)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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