Re: Multiple Xids in PGPROC?

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Alvaro Herrera <alvherre(at)dcc(dot)uchile(dot)cl>
Cc: Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Multiple Xids in PGPROC?
Date: 2004-05-05 03:21:07
Message-ID: 16541.1083727267@sss.pgh.pa.us
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Alvaro Herrera <alvherre(at)dcc(dot)uchile(dot)cl> writes:
> So, the big question is, how do we do this? The most obvious way (to
> me) is to keep the whole array inside the PGPROC struct.
> ...
> The main downside is that it potentially
> requires a lot of shared memory. Can we afford that?

No. Shared memory is fixed size, therefore the above is guaranteed to
fail.

I thought we had devised a solution that did not require expansible
shared memory for this. Bruce, Manfred, do you recall how that went?

regards, tom lane

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