Thanks for the input everyone. I think Harald's approach will work
well, so I'm planning on doing what he suggested, with a few
modifications. I think I can still use a sequence-backed INTEGER rather
than TIMESTAMP, and have the trigger that sets the revision to NULL also
NOTIFY the daemon that will update the revision to
nextval('revision_sequence_name') of any updates, rather than running it
from a cron job every X minutes. The updates sent to the client would
also include rows with revision = NULL so that the client would not lag
behind, at the expense of sometimes having updates sent twice to the client.
Thanks again,
Alex
Harald Fuchs wrote:
In article <[EMAIL PROTECTED]>,
Alex Adriaanse <[EMAIL PROTECTED]> writes:
I think that would greatly decrease the chances of a race condition
occurring, but I don't think it'd solve it. What if 150 other
revisions occur between a row update and its corresponding commit?
How about the following:
* Use a TIMESTAMP rather than a SERIAL
* Set this timestamp to NULL in your INSERT/UPDATE trigger
* Use a cron job to set the timestamp to current_timestamp when it's NULL
This way the client would lag behind somewhat, depending on the cron
job frequency, but it should not miss a change.
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