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Re: Transaction Snapshot Cloning

From: "Florian G(dot) Pflug" <fgp(at)phlo(dot)org>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: Chris Browne <cbbrowne(at)acm(dot)org>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Transaction Snapshot Cloning
Date: 2008-01-17 10:56:48
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Lists: pgsql-hackers
Tom Lane wrote:
> I'm not sure what the most convenient user API would be for an on-demand
> hard-read-only mode, but we can't use SET TRANSACTION READ ONLY for it.
> It'd have to be some other syntax.  Maybe just use a GUC variable
> instead of bespoke syntax?  SET TRANSACTION is really just syntactic
> sugar for GUC SET operations anyway ...

We could reuse the transaction_read_only GUC, adding "strict" as a 3rd 
allowed value beside "on" and "off". And maybe make "ansi" an alias for 
"on" to emphasize that one behavior is what the standard wants, and the 
other is a postgres extension.

regards, Florian Pflug

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