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From: "D'Arcy J.M. Cain" <darcy@druid.net>
To: Carmen Marincu <marincuc@eeng.dcu.ie>, pgsql-sql@postgresql.org
Subject: Re: vacuum and serial primary keys
Date: Sat, 1 Feb 2003 09:16:08 -0500
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On Saturday 01 February 2003 07:45, Carmen Marincu wrote:
> I am using Postgresql 7.1.3 and I have deleted 3000 rows from a table
> (with DELETE).
> Than I used vacuum <mytable> to actually delete the rows markes as deleted
> by the DELETE command..
> The trouble is that the "counter" for the serial primary key (ID field)
> wasn't reset. So now althought I have only 2 rows in my table they have
> the ID 3001 and 3002.
>
> Is this normal ? If not could someone please explain me how could  I reset
> the "counter" to ignore the deleted rows ?

It is very normal.  The last thing you need is a database engine that chang=
es=20
your primary key without an explicit command to do so.  In fact, sometimes =
I=20
think that the database should enforce the rule that primary keys are=20
immutable and not even allow it explicitely.  Perhaps a configuration optio=
n.

--=20
D'Arcy J.M. Cain <darcy@{druid|vex}.net>   |  Democracy is three wolves
http://www.druid.net/darcy/                |  and a sheep voting on
+1 416 425 1212     (DoD#0082)    (eNTP)   |  what's for dinner.