| From: | "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com> |
|---|---|
| To: | "drum(dot)lucas(at)gmail(dot)com" <drum(dot)lucas(at)gmail(dot)com> |
| Cc: | Melvin Davidson <melvin6925(at)gmail(dot)com>, Postgres General <pgsql-general(at)postgresql(dot)org> |
| Subject: | Re: index question |
| Date: | 2016-05-02 20:08:02 |
| Message-ID: | CAKFQuwZ1HWPbBFVZRhSA+ZCtQ6-nU_+h59babnpBy71uEPeN-A@mail.gmail.com |
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| Lists: | pgsql-general |
On Mon, May 2, 2016 at 12:56 PM, drum(dot)lucas(at)gmail(dot)com <drum(dot)lucas(at)gmail(dot)com>
wrote:
>
>>>
>> Index size and index usage are unrelated. Modifications to the index to
>> keep it in sync with the table do not count as "usage" - only reading it
>> for where clause use counts.
>>
>>
>> So only those with* 0 size*, should be deleted? Is that you're saying?
>
I'm not offering advice as to when to delete or not delete any particular
index.
> Can you be more clear please?
>
>
Probably not :)
You cannot make an inference about an index's usage by looking at its
size. Similarly, a seldom used but large index is not necessarily one you
want to remove if doing so causes a once-a-month process that usually take
seconds or minutes to now take hours.
David J.
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