The Next-gen Databases

Question

I'm learning traditional Relational Databases (with PostgreSQL) and doing some research I've come across some new types of databases. CouchDB, Drizzle, and Scalaris to name a few, what is going to be the next database technologies to deal with?

Answer 1

Might be not the best place to answer with this, but I'd like to share this taxonomy of noSQL world created by Steve Yen (please find it at http://de.slideshare.net/northscale/nosqloakland-200911021)

1. key‐value‐cache

   • memcached
   • repcached
   • coherence
   • 
infinispan
   • eXtreme
scale
   • 
jboss
cache
   • velocity
   • terracoqa


2. key‐value‐store

   • 
keyspace
   • 
flare
   • schema‐free
   • 
RAMCloud


3. eventually‐consistent key‐value‐store

   • dynamo
   • 
voldemort
   • 
Dynomite
   • 
SubRecord
   • 
MongoDb
   • 
Dovetaildb

4. ordered‐key‐value‐store

   • tokyo
tyrant
   • lightcloud
   • 
NMDB
   • luxio
   • 
memcachedb
   • 
actord


5. data‐structures server

   • redis


6. tuple‐store

   • gigaspaces
   • 
coord
   • 
apache
river

7. object database

   • ZopeDB
   • db4o
   • 
Shoal


8. document store

   • CouchDB
   • Mongo
   • 
Jackrabbit
   • 
XML
Databases
   • 
ThruDB
   • 
CloudKit
   • 
Perservere
   • 
Riak
Basho
   • 
Scalaris


9. wide columnar store

   • BigTable
   • Hbase
   • Cassandra
   • Hypertable
   • KAI
   • 
OpenNep

Answer 2

Not to be pedantic, but I would like to point out that at least CouchDB isn't SQL-based. And I would hope that the next-gen SQL would make SQL a lot less... fugly and non-intuitive.