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Database system identifier via SELECT?

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To: pgsql-general <pgsql-general@xxxxxxxxxxxxxx>
Subject: Database system identifier via SELECT?
From: Chris Redekop <chris@xxxxxxxxxxxx>
Date: Thu, 8 Dec 2011 11:08:31 -0700

Is there any way to get the database system identifier via a select statement? I have a primary/secondary async replication setup, and I'd like be able to verify from the client side that the provided primary and secondary connection strings do in fact refer to the same data set...

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