Обсуждение: Estimate physical index size

Alejandro  wrote:

> I need to know how to estimate physical index size. I can't find
> any formulas in online documentation.

For an existing index you probably want pg_relation_size():

http://www.postgresql.org/docs/9.0/interactive/functions-admin.html#FUNCTIONS-ADMIN-DBSIZE

-Kevin

Kevin,
     thanks for reply.

     I need to estimate the entire database size (tables, indexes,
etc.), prior to create it. I know how to calculate a table size, but I
don't know how to calculate an index size.

Thanks.


Alejandro


On 11/09/11 12:47, Kevin Grittner wrote:
> Alejandro  wrote:
>
>> I need to know how to estimate physical index size. I can't find
>> any formulas in online documentation.
>
> For an existing index you probably want pg_relation_size():
>
> http://www.postgresql.org/docs/9.0/interactive/functions-admin.html#FUNCTIONS-ADMIN-DBSIZE
>
> -Kevin
>
>