Re: Unused indexes - PostgreSQL 9.2

[Melvin Davidson <melvin6925@xxxxxxxxx>]

Here is the url which explains the columns in pg_stat_all_indexes view
http://www.postgresql.org/docs/9.2/static/monitoring-stats.html#PG-STAT-ALL-INDEXES-VIEW

On Mon, May 23, 2016 at 8:42 PM, David G. Johnston <david.g.johnston@xxxxxxxxx> wrote:

On Mon, May 23, 2016 at 8:33 PM, Lucas Possamai <drum.lucas@xxxxxxxxx> wrote:

On 24 May 2016 at 12:18, Jeff Janes <jeff.janes@xxxxxxxxx> wrote:

On Mon, May 23, 2016 at 4:23 PM, Lucas Possamai <drum.lucas@xxxxxxxxx> wrote:
>
> That index has been added just 3 hours ago, and you can see that the
> times_used goes over 41000.... How is that possible??

Well, that is what it is there for, right , to be used?  My ancient
laptop can use an index that many times in less than 20 seconds,
running flat out.

Yeah!
But I mean... over 70.000 times in 4 hours? that's a lot of usage! ahhahaha

 

>
> Don't think the query is right.
>
> Can you please check ?

The query seems right to me.

Cheers,

Jeff

I think the query is ok.. just wanna understand if that value is correct :O

If it is.. I'm happy with that. Just shows the work of finding and creating the index worthed it.

​I don't have the answer off hand but what is it counting?  If it counts, say, each lookup into the index during a nested loop evaluation the difference in perception​ could be easily explained.

David J.

--

Melvin Davidson
I reserve the right to fantasize.  Whether or not you
wish to share my fantasy is entirely up to you.