Re: Is this a commit problem?

markw@osdl.org writes:
> I take it PQexec() should wait until the COMMIT finishes?

Yeah, it does.  Where is the next iteration of the transaction coming
from?

Another thought occurred to me --- you said you have many parallel
instances of this transaction, but they affect different rows because
they have different keys.  Is it possible there's a logic bug that
occasionally allows parallel transactions to be fired with the same key?
        regards, tom lane