On Wed, Dec 06, 2006 at 08:26:45AM -0500, Dave Cramer wrote:
> Apparently I've completely misunderstood MVCC then.... My
> understanding is that unless you do a select ... for update then
> update the rows will not be locked .
The discussion was about updates, not selects. Selects do not in general lock
(except for ... for update, as you say).
To (partially) answer the original question: The number of columns updated
does not matter for the locking situation.
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