From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
---|---|
To: | Marc Munro <marc(at)bloodnok(dot)com> |
Cc: | Stephan Szabo <sszabo(at)megazone(dot)bigpanda(dot)com>, pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: referential Integrity and SHARE locks |
Date: | 2007-02-08 19:33:38 |
Message-ID: | 9067.1170963218@sss.pgh.pa.us |
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Lists: | pgsql-hackers |
Marc Munro <marc(at)bloodnok(dot)com> writes:
> Yes in this case, T1 must abort because the record it was going to
> update has disappeared from underneath it. I don't see how this is
> significantly different from the same race for the record if the table
> had no RI constraints. The only difference that I can see, is that T1
> now has some locks that it must relinquish as the transaction aborts.
No, the difference is there would have been no error at all before;
if the record were deleted before T1 got to it then it wouldn't have
attempted to update it. I really don't think you can make it work
to perform updates or deletes on a record you have not yet locked.
regards, tom lane
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