Re: Newbie question

From: mountain man <>
Date: Thu, 16 Jun 2005 09:44:12 GMT
Message-ID: <MRbse.18443$>

"panther" <> wrote in message
> Hi,
> I'd like to know what happens when a counter field defined as "primary
> key" runs into overflow (very big number).

Here are one (MS SQL) sample classification for the integer data type ....

bigint: Integer (whole number) data from -2^63 (-9223372036854775808) through 2^63-1 (9223372036854775807). Storage size is 8 bytes.

int: Integer (whole number) data from -2^31 (-2,147,483,648) through 2^31 - 1 (2,147,483,647). Storage size is 4 bytes. The SQL-92 synonym for int is integer.

smallint: Integer data from -2^15 (-32,768) through 2^15 - 1 (32,767). Storage size is 2 bytes.

tinyint: Integer data from 0 through 255. Storage size is 1 byte.

An overflow will happen to a tinyint type when the increment exceeds 255, for the smallint type when the increment exceeds 32767, and so forth all the way up the scale.

> How is it managed?

The overflow is managed by increasing the integer bound to the next higher classification. See the scales applicable above

ie: Simply change the integer type.

Pete Brown
IT Managers & Engineers
Falls Creek
Received on Thu Jun 16 2005 - 11:44:12 CEST

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