Re: 7.4 Wishlist

Kevin Brown wrote:
> Christopher Kings-Lynne <chriskl@familyhealth.com.au> wrote:
> > Hi guys,
> > 
> > Just out of interest, if someone was going to pay you to hack on Postgres
> > for 6 months, what would you like to code for 7.4?
> 
> Well, on top of the oft-requested replication support and savepoint
> support, I'd like to see UPDATE, er, updated to be able to make use of
> cursors.

I think this could be easily done by using the tid of the cursor row for
the update, assuming there is a clear tid for the SELECT.  Jan has
talked about doing that.

> I'd also like to see (if this is even possible) a transaction
> isolation mode that would make it possible for multiple concurrent
> updates to the same row to happen without blocking each other (I
> imagine one way to make this possible would be for the last
> transaction to commit to be the one that "wins".  Each transaction
> that commits gets its updates written so that other transactions that
> begin after they commit will see them, of course).  Neither "read
> committed" nor "serialized" modes offer this.  Don't know if it's
> possible, but it would be nice (such that a transaction sees the
> database as if it has it all to itself and doesn't block on
> updates)...

How would you do the update if you don't know of the transaction commits
or aborts?

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