Hi I have a table with very large data,can the sharding improve the query performance?
mongodb:Can sharding improve query performance?
At their last major pre-release (when sharding was demo'd), they have an 8-server configuration, each with sharding, and were getting a million rows/sec.
Also, mongodb is a key-value type database, so it is very optimized for single value lookups. Basically, more is needed about your use case to give you a good answer.