Jenna questions

Jenna answers

• mongodb groupby slow even after adding index
• mongo - couldn't connect to server 127.0.0.1:27017
• Why are my mongodb indexes so large
• Binning and tabulate (unique/count) in Mongo
• Want to do an incremental backup for mongodb. Journaling? Oplog?
• MongoDB MapReduce - Emit one key/one value doesnt call reduce
• MongoDb $and operator with geospatial queries
• mongodb map reduce on multicore server