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Re: event based scheduling and queues

From: Christo Kutrovsky <kutrovsky.oracle_at_gmail.com>
Date: Fri, 9 Dec 2005 15:03:34 -0500
Message-ID: <52a152eb0512091203sad33ce3jda489b1b44de3ae4@mail.gmail.com>


Can you give us more details about how you enque and make the job wakeup ? Perhaps some code extracts ?

On 12/9/05, Chris Stephens <cstephens16_at_gmail.com> wrote:
> 10gR2 on linux
>
> We have a queue that accepts xml documents. Documents are members of
> sets. No document can be processed unless the entire set has been
> enqueued. We indicate this by a 'isLastInSet' attribute in the
> payload. We were hoping to set an event based job that is triggered
> this attribute having a 'true' value.
>
> In testing this out we discovered that events can be ignored when the
> job that wakes up is already active. We ran a loop that enqueued
> 20,000 items that all had isLastInset = 'true'. The action in the job
> was to simply insert a row into a table. After executing the test,
> there were only 224 rows inserted. This obviously leaves open the
> possibility that many items will be left unprocessed.
>
> We need a solution that ensures all sets are processed as soon as the
> last set member is enqueued.
>
> Has anyone had similar requirements? ...and if so, what was the
> implementation? did you have a polling process that wakes up every so
> often and evaluates the entire queue?
>
> thanks,
> chris
> --
> http://www.freelists.org/webpage/oracle-l
>
>
>

--
Christo Kutrovsky
Database/System Administrator
The Pythian Group
--
http://www.freelists.org/webpage/oracle-l
Received on Fri Dec 09 2005 - 14:03:48 CST

Original text of this message

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