Обсуждение: btree information
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
--
Eduardo Bezerra Valentin
Bacharelado em Ciência da Computação - DCC - UFAM
Laboratório de VoIP - GRSD - UFAM
--
Eduardo Bezerra Valentin
Bacharelado em Ciência da Computação - DCC - UFAM
Laboratório de VoIP - GRSD - UFAM
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
But, where can I find out this utility? Is it pg_dump?
2005/6/7, Alvaro Herrera <alvherre@surnet.cl >:
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
--
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"