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From: "Sreenivas.T" <sreenux@gmail.com>
Date: Thu, 14 Sep 2017 09:02:11 +0000
Message-ID: <CALz5_ysxVD67PUipKK+caWrVQi7yFKjW81NQ+uy6jEd-cozDFQ@mail.gmail.com>
Subject: Re: Provide suggestion on indexing performance
To: solr-user@lucene.apache.org
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archived-at: Thu, 14 Sep 2017 09:02:31 -0000

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I agree with Tom. Doc values and stored fields are present for different
reasons. Doc values is another index that gets build for faster
sorting/faceting.

On Wed, Sep 13, 2017 at 11:30 PM Tom Evans <tevans.uk@googlemail.com> wrote:

> On Tue, Sep 12, 2017 at 4:06 AM, Aman Tandon <amantandon.10@gmail.com>
> wrote:
> > Hi,
> >
> > We want to know about the indexing performance in the below mentioned
> > scenarios, consider the total number of 10 string fields and total number
> > of documents are 10 million.
> >
> > 1) indexed=true, stored=true
> > 2) indexed=true, docValues=true
> >
> > Which one should we prefer in terms of indexing performance, please share
> > your experience.
> >
> > With regards,
> > Aman Tandon
>
> Your question doesn't make much sense. You turn on stored when you
> need to retrieve the original contents of the fields after searching,
> and you use docvalues to speed up faceting, sorting and grouping.
> Using docvalues to retrieve values during search is more expensive
> than simply using stored values, so if your primary aim is retrieving
> stored values, use stored=true.
>
> Secondly, the only way to answer performance questions for your schema
> and data is to try it out. Generate 10 million docs, store them in a
> doc (eg as CSV), and then use the post tool to try different schema
> and query options.
>
> Cheers
>
> Tom
>

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