RE: Which query is best?

>> ... they have a SELECT FOR UPDATE and some other series of actions
and then
>> followed by an UPDATE command.

This is fine, but as you can see from your problem, it leads to all sorts of enqueue problems. As I initially though, it is sounding a lot like "lazy developer syndrome" - but obviously, I can't be 100% sure! ;-)

>> ...

>> ...they are going to put the time out value at the end of
>> SELECT .. FOR UPDATE command, probably 60 seconds time out
>> for the lock.

Well, this can lead to two separate options. The first is that whatever UPDATE they planned on doing will now fail because they were stuck on an enqueue wait for 60 seconds then it timed out.

The second option is to wait on the enqueue for 60 seconds, then loop back and wait another 60 second.

In the first case, the application is not processing as it should. In the second case, you have the same problem that you have now. Nothing has actually changed.

So I'm a little puzzled as to how any of this solves your actual problem. Or are they planning on some other course of action when the WAIT 60 option times out?

Cheers,
Norman.

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