Re: Auto incrementing primary keys

From: Steve Atkins <steve(at)blighty(dot)com>
To: pgsql-general General <pgsql-general(at)postgresql(dot)org>
Subject: Re: Auto incrementing primary keys
Date: 2008-02-18 18:16:35
Message-ID: 6A049D96-D7B8-4892-AC0C-06F378F350A1@blighty.com
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On Feb 18, 2008, at 9:56 AM, Raymond O'Donnell wrote:

> On 18/02/2008 17:46, Raymond O'Donnell wrote:
>
>> Well, that depends on your usage, so only you can answer that.
>> According to the docs, "serial" creates an integer column, which
>> will give you 2147483647 values - how quickly will you use that lot
>> up? If you think you will run out, by all means use bigserial.
>
> Actually, that isn't quite right - just looked at the docs for
> CREATE SEQUENCE, and the default maximum value is 2^63-1.

That's the maximum value for the sequence itself, but a "serial" is
just an integer, so the 2^31-1 limit before wraparound still applies.

Cheers,
Steve

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