Non-Relational DBs
from Data Design point of view; broadly there are two design approaches,
- Google's Bigtable like designs which are column based eg: Hypertable and HBAse
- A simpler Key/Value storage using distributed hash tables (DHTs) eg: Project Voldemort, MongoDB, CouchDB
common specs of both designs
- not a prefixed schema, only domains are set (broadly, these are like RDMS tables)
- entries in domains have a key, and keys have set of attributes
- no prefixed rules defined for these attributes & no explicit definition of domains
- scalable - new nodes can be added and removed easily, able to handle heavy workloads
Bigtable paper by Google summarized here.
