Jim Nasby <[EMAIL PROTECTED]> writes:
> While working on determining a good stripe size for a database, I  
> realized it would be handy to know what the average request size is.  
> Getting this info is a simple matter of joining pg_stat_all_tables  
> and pg_statio_all_tables and doing some math, but there's one issue  
> I've found; it appears that there's no information on how many heap  
> blocks were read in by an index scan. Is there any way to get that info?

If the table is otherwise idle, the change in the table's entry in
pgstatio_all_tables should do, no?

(This is as of 8.1 ... older versions acted a bit differently IIRC.)

                        regards, tom lane

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