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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