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
