All,
Since I have not seen any follow up post,
I am wondering if my question is not clear or
what.
Anyway, my postgres version is 7.3.2, and I
want to know:
1. How to determine if some of indexes are used by
any queries, like Oracle's:
alter index my_index monitoring usage
2. The relationship between
"number of index scans done" and
"Number of disk block fetch requests for index"
as shown in the query.
Thank you!
--- Litao Wu <litaowu@yahoo.com> wrote:
> Hi,
>
> I have query:
> select pg_stat_get_numscans(76529669),
> pg_stat_get_blocks_fetched(76529669),
> pg_stat_get_blocks_hit(76529669);
>
> The result is:
> pg_stat_get_numscans | pg_stat_get_blocks_fetched |
> pg_stat_get_blocks_hit
>
----------------------+----------------------------+------------------------
> 0 | 23617 |
>
> 23595
> (1 row)
>
> My questions are:
> 1. How can index disk blocks be requested (either
> from disk or cache) without index scan?
> 2. If I want to check if an index is used after
> pg_stat_reset(), how can I get it? By number of
> scans
> or block requests, or some other ways?
>
> Thanks,
>
>
>
>
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