case for lock_timeout

Hi,

With reference to:

http://archives.postgresql.org/pgsql-hackers/2004-06/msg00935.php

Consider a case

1. wherein a database dump takes 2 hrs to complete.
2. A cron gets fired which drops a certain table and recreates it.
3. A set of frequently requested web pages depends on reading from the table in 2

Since 2 will wait for 1 till it finishes, and 3 will wait for 2 this means those
set of webpages will become inaccessible while the backup is in progress.

Whereas if we have something like a lock_timeout 2 will abort within a limited
time duration automatically and the sys admin could get notified to reschedule
it and this problem can get averted.

I feel lock_timeout it will be a nice feature . Lemme know what would be
the solution of the above problem from existing set of features.

Regds
Mallah.

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