From: | "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com> |
---|---|
To: | Lucas Possamai <drum(dot)lucas(at)gmail(dot)com> |
Cc: | Jeff Janes <jeff(dot)janes(at)gmail(dot)com>, Melvin Davidson <melvin6925(at)gmail(dot)com>, Postgres General <pgsql-general(at)postgresql(dot)org> |
Subject: | Re: Unused indexes - PostgreSQL 9.2 |
Date: | 2016-05-24 00:42:33 |
Message-ID: | CAKFQuwa-Nhj-=99Mt8C7r0B5BiqZV=DWX9PET5j0B2RGqPodNQ@mail.gmail.com |
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Lists: | pgsql-general |
On Mon, May 23, 2016 at 8:33 PM, Lucas Possamai <drum(dot)lucas(at)gmail(dot)com>
wrote:
>
>
> On 24 May 2016 at 12:18, Jeff Janes <jeff(dot)janes(at)gmail(dot)com> wrote:
>
>> On Mon, May 23, 2016 at 4:23 PM, Lucas Possamai <drum(dot)lucas(at)gmail(dot)com>
>> 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.
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