Skip site navigation (1) Skip section navigation (2)

NUMERIC size

From: Fujii Masao <masao(dot)fujii(at)gmail(dot)com>
To: pgsql-docs <pgsql-docs(at)postgresql(dot)org>
Subject: NUMERIC size
Date: 2012-03-22 02:35:40
Message-ID: CAHGQGwGupGaNmQQHHhm783j9vMiNYtPFZaE0eKwsCLGwMU2x+Q@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-docs
Hi,

> Numeric values are physically stored without any extra leading or
> trailing zeroes. Thus, the declared precision and scale of a column
> are maximums, not fixed allocations. (In this sense the numeric type
> is more akin to varchar(n) than to char(n).) The actual storage
> requirement is two bytes for each group of four decimal digits,
> plus five to eight bytes overhead.

The last sentence of the above seems not to be correct. Because,
thanks to the reduction of NUMERIC size (committed in 9.1), its header
size is three, five or eight for now. Attached patch fixes this.

Regards,

-- 
Fujii Masao
NIPPON TELEGRAPH AND TELEPHONE CORPORATION
NTT Open Source Software Center

Attachment: numeric_typo.patch
Description: text/x-diff (517 bytes)

Responses

pgsql-docs by date

Next:From: Tom LaneDate: 2012-03-22 04:12:51
Subject: Re: Cannot build docs on Ubuntu 10.04?
Previous:From: Robert HaasDate: 2012-03-21 18:53:07
Subject: Re: Update documentation wrt visibility map/index-only scans

Privacy Policy | About PostgreSQL
Copyright © 1996-2014 The PostgreSQL Global Development Group