Re: Synchronization issues with pg73jdbc3.jar and pg73jdbc2ee.jar

Gerlits,

I still don't understand your problem. From what I can see the database
is doing the correct thing. You issue a bunch of selects that will all
return the same value, and then you try to insert that value into a
table with a unique index and you end up with duplicate key in index errors.

thanks,
--Barry

Gerlits AndrXs wrote:
> Those stacktraces are exactly my concern. I don't expect my code to behave
> like that :).
>
> On Mon, 26 May 2003 11:30:50 -0700, Barry Lind <blind(at)xythos(dot)com> wrote :
>
>
>>Gerlite,
>>
>>I ran the test program you submitted and it seems to run OK (other than
>>some duplicate key in index errors). What is the problem you are
>>seeing? Specifically what are you expecing to happen, and how does what
>>you are seeing differ from your expectatations.
>>
>>thanks,
>>--Barry
>>
>>Gerlits AndrXs wrote:
>>
>>>Attached you'll find a simple multi-threaded example of a couple of
>>>SERIALIZABLE transactions. I hope, I'm not making a complete ass of
>
> myself,
>
>>>but it seems that the JDBC driver is unprepared to handle simultaneous
>>>SERIALIZABLE transactions.
>>>
>>>The table structure to test with is really simple:
>>>
>>>CREATE TABLE test (
>>> id integer UNIQUE NOT NULL
>>>);
>>>
>>>The program tries to access the database for the highest id available,
>
> then
>
>>>use it in a preparedstatement.
>>>
>>>(The reason we do that is to prepare for the worst DB server available,
>
> we
>
>>>know that there are other ways to do this in postgres.)
>>>
>>>It first opens the connections, stores them, than hands them to the
>
> threads.
>
>>>No connection is issued twice simultaneously.
>>>
>>>Please edit the variables at the top, but check not to have more
>>>InserterThreads than dbConnections.
>>>
>>>Thanks
>>>Andras Gerlits
>>>
>>>
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>>>
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>>
>>
>>
>>
>>
>