Search Postgresql Archives

Re: Size of tuples

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On 10/09/06 19:10, Alex Turner wrote:
> I have a table whose definition is basically
> 
> create table foo (
> a int,
> b int,
> c int,
> d date
> );
> 
> and when fully populated, select relpages*8192::long/reltuples from
> pg_class
> where relname='foo';
> gives around 52.  Why is it so wide when there are only 4*4=16 bytes of
> actual data?

http://www.postgresql.org/docs/faqs.FAQ.html#item4.5

   23  row header (no OIDs)
 + 16  your row size
 +  4  page pointer
   --
   43

I'd guess that the extra 4 bytes is from the null bits, page
overhead, etc.

- --
Ron Johnson, Jr.
Jefferson LA  USA

Is "common sense" really valid?
For example, it is "common sense" to white-power racists that
whites are superior to blacks, and that those with brown skins
are mud people.
However, that "common sense" is obviously wrong.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.5 (GNU/Linux)

iD8DBQFFKvWNS9HxQb37XmcRAuadAKDTDW3nSap3VutXXZB1vHnAFXMd8QCeIqpc
vMEiTn+MTBeP6wEkLO3zdwI=
=VeUp
-----END PGP SIGNATURE-----


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Index of Archives]     [Postgresql Jobs]     [Postgresql Admin]     [Postgresql Performance]     [Linux Clusters]     [PHP Home]     [PHP on Windows]     [Kernel Newbies]     [PHP Classes]     [PHP Books]     [PHP Databases]     [Postgresql & PHP]     [Yosemite]
  Powered by Linux