Обсуждение: btree information

On Tue, Jun 07, 2005 at 01:36:56PM -0400, Eduardo Bezerra wrote:
> hi all,
>  Someone can help me to find these data about btree index:
>   * height;
>  * maximum number of keys per block
>  * average number of keys per block
>  * number of leaf blocks
>  * average number of leaf blocks per total number of keys
>  * average number of data blocks per total number of keys

I guess what I'd do is run pg_filedump in an btree index file to find
out.  Leaf pages are marked with the BTP_LEAF flag.

Regarding the number of keys in a block, it's variable, depends on the
size of the keys.  You can find out for a particular index using
pg_filedump too.

--
Alvaro Herrera (<alvherre[a]surnet.cl>)
Jude: I wish humans laid eggs
Ringlord: Why would you want humans to lay eggs?
Jude: So I can eat them

Sorry,

   But, where can I find out this utility? Is it pg_dump?




--
Eduardo Bezerra Valentin
Bacharelado em Ciência da Computação - DCC - UFAM
Laboratório de VoIP - GRSD - UFAM

On Wed, Jun 08, 2005 at 07:04:17AM -0600, Eduardo Bezerra wrote:
> Sorry,
>
> But, where can I find out this utility? Is it pg_dump?

No, see in http://sources.redhat.com/rhdb or thereabouts (maybe
http://sources.redhat.com/RHDB even, not sure)

--
Alvaro Herrera (<alvherre[a]surnet.cl>)
"Puedes vivir solo una vez, pero si lo haces bien, una vez es suficiente"