Re: 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