Apologies for late reply, Thanks Toke for a great explaination :)
I am new in solr so i am unaware of DocValues, so please can you explain.

With Regards
Aman Tandon


On Fri, May 2, 2014 at 1:52 PM, Toke Eskildsen <t...@statsbiblioteket.dk>wrote:

> On Thu, 2014-05-01 at 23:03 +0200, Aman Tandon wrote:
> > So can you explain how enum is faster than default.
>
> The fundamental difference is than enum iterates terms and counts how
> many of the documents associated to the terms are in the hits, while fc
> iterates all hits and updates a counter for the term associated to the
> document.
>
> A bit too simplified we have enum: terms->docs, fc: hits->terms. enum
> wins when there are relatively few unique terms and is much less
> affected by index updates than fc. As Shawn says, you are best off by
> testing.
>
> > We are planning to move to SolrCloud with the version solr 4.7.1, so does
> > this 14 GB of RAM will be sufficient? or should we increase it?
>
> Switching to SolrCloud does not change your fundamental memory
> requirements for searching. The merging part adds some overhead, but
> with a heap of 14GB, I would be surprised if that would require an
> increase.
>
> Consider using DocValues for facet fields with many unique values, for
> getting both speed and low memory usage at the cost of increased index
> size.
>
> - Toke Eskildsen, State and University Library, Denmark
>
>
>

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