From: | "Kathy Lo" <kathy(dot)lo(dot)ky(at)gmail(dot)com> |
---|---|
To: | pgsql-general(at)postgresql(dot)org |
Subject: | Restart a sequence regularly |
Date: | 2007-11-21 07:39:43 |
Message-ID: | c10e7feb0711202339j2fda10cbn41262c7bbdcfea60@mail.gmail.com |
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Lists: | pgsql-general |
Hi,
I am using Postgresql 8.0.3 in Fedora Core 4.
In my database, it contains a sequence. And, I need to alter the range
of this sequence and restart it to the start of the new range at
00:00:00 on 1st January on every year. 5 seconds before and after that
time, I need to prevent users from calling nextval() to retrieve the
next number from this sequence.
I can write a Perl script to alter the sequence and schedule to run
this script at 23:59:55 on 31st December on every year.
But, I don't know how to lock the sequence to prevent others from
accessing this sequence to get next number and Postgresql does not
support to lock a sequence.
How can I prevent others from accessing the sequence, like locking a
table? That means, when others want to access the sequence between
31-Dec 23:59:55 and 1-Jan 00:00:05, they are waiting instead of
getting an error.
Thank
--
Kathy Lo
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