For the ones working on tradional databases, I have listed down the differences I have found to begin with HBase
Tradional
DBs, Oracle, MSSQL, etc
|
HBase
|
Structured Data
|
Semi-structured and unstructured data
|
Schema on Write
|
Schema on Read
|
Fixed Schema
|
Schema-less
|
Fixed Columns
|
Millions of columns can be added dynamically
|
Suitable for limited volume of data
|
Billions of rows, millions of columns. Tables can spread across regions on
multiple nodes
|
Primary key based scanning of the whole table or indexing
|
Row key based scanning
|
SQL query language used
|
Basic Hbase shell commands – put, get, scan.
Java programming needed to scan data.
|
Normalized
|
Denormalized
|
