Re: Update / Lock (and ShareLock) question

Augustin Amann <augustin@waw.com> writes:
> During lock, we could see things like this in log file:
> Process 5556 waits for ShareLock on transaction 14910066; blocked by
> process 4940.

What that really means is that the first process is waiting for a row
lock that's held by the second one --- that is, it's trying to update a
row that the second transaction has updated and not yet committed.

> Why waiting update are not simply queued ?

Uh, that's exactly what's happening.

            regards, tom lane