Re: SELECT ... FOR UPDATE [WAIT integer | NOWAIT] for 8.5

hello greg,

the thing with statement_timeout is a little bit of an issue.
you could do:
SET statement_timeout TO ...;
SELECT FOR UPDATE ...
SET statement_timeout TO default;

this practically means 3 commands.
the killer argument, however, is that the lock might very well happen
ways after the statement has started.
imagine something like that (theoretical example):

SELECT ...
FROM
WHERE x > ( SELECT some_very_long_thing)
FOR UPDATE ...;

some operation could run for ages without ever taking a single, relevant
lock here.
so, you don't really get the same thing with statement_timeout.

regards,

hans

Greg Stark wrote:
> Can't you to this today with statement_timeout? Surely you do want to
> rollback the whole transaction or at least the subtransaction if you
> have error handling.
>

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