Hi All, I have started to use mongodb and solr recently. Please feel free to correct me where my understanding is not upto the mark:
1. Solr is indexing engine but it stores both data and indexes in same directory. Although we can select fields to store/persist in solr via schema.xml. But in nutshell, it's not possible to distinguish between data and indexes like, I can't remove all indexes and still have persisted data with SOLR. 2. Solr indexing capabilities are far better than any other nosql db like mongodb etc. like faceting, weighted search. 3. Both support scalability via sharding. 4. We can have architecture where data is stored in separate db like mongodb or mysql. SOLR can connect with db and index data (in SOLR). I tried googling for question "solr vs mongodb" and there are various threads on sites like stackoverflow. But I still can't understand why would anyone go for mongodb and when for SOLR (except for features like faceting, may be CAP theorem). Are there any specific use-cases for choosing NoSQL databases like mongoDB over SOLR? Regards, Prateek Jain
