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Re: [BUGS] server crash in very big transaction [postgresql 8.0beta1]

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Gavin Sherry <swm(at)linuxworld(dot)com(dot)au>
Cc: Alvaro Herrera <alvherre(at)dcc(dot)uchile(dot)cl>,pgsql-hackers(at)postgresql(dot)org
Subject: Re: [BUGS] server crash in very big transaction [postgresql 8.0beta1]
Date: 2004-08-25 04:30:23
Message-ID: 15118.1093408223@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-bugspgsql-hackers
Gavin Sherry <swm(at)linuxworld(dot)com(dot)au> writes:
> As for extending the length of xl_len, what happens if someone now has
> 2^30 subtransaction IDs (as unlikely as that sounds)?

They'll have run out of RAM to store the subxact-related storage before
that (not to mention most likely have exhausted the CommandCounter
range, not to mention exhausted their patience --- it takes a good while
even to exercise the 2^16-subxact case).  I'm satisfied if we can
approach that limit.  Exceeding it will be a task for some other release.

			regards, tom lane

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