1. NoSQL Databases
Advanced Database Management Systems
Vamshi Krishna Reddy V
MT2009151
International Institute of Information Technology
Bangalore, India

2. Relational Databases
• MySQL, PostgreSQL, SQLite, Oracle etc.,
• Good at
• Schemas
• Strong Consistency
• Transactions
• “Mature” and well tested
• Availability of Expertise

3. What is NoSQL?
• It’s not Anti SQL or ‘NO’ SQL.
• It means (N)ot (O)nly SQL.
• Exact name could be Non Relational DB.
• Present trend of sharing needs small and
simple terms.

4. Data – Information Explosion
• Internet Scale
• Massive data collections.
• Huge number of requests.
• 24/7 across the globe.

5. Need for NoSQL

6. Types of NoSQL Solutions
NoSQL Databases
Key-Value
Column Store stores
Databases
Document
Oriented Graph
databases Databases
XML Databases
Others

7. For Whom?
• Specific Needs
• Non Safety critical systems
• Web applications like
– Social networking
– Music and Video streaming.

8. Features of NoSQL
• Schema less
• High Availability
• Horizontal Scalability

9. Conflicts of NoSQL with SQL
• ACID versus BASE
• A: Atomicity
• C:Consistency
• I: Isolation
• D: Durability
• CAP Theorem
• C: Consistency
• A: Availability
• P: Partition Tolerance

10. Consistency
Consistency
Strong Weak
Consistency Consistency
Eventual
Consistency Other

11. Challenges in using NoSQL
• Lack of Expertise.
• Historic Decisions in designing application
database.
• Incorporating into monolithic system having
relational data.
• Support to ad-hoc queries by NoSQL.

12. Conclusion
• Ease of use
• Way of thinking
• Eventual Consistency
• It’s about choosing right tool for right job.

13. References
[1] The end of SQL and relational databases.
http://blogs.computerworld.com/15510/the_end_of_sql_and_relational_databases_part_1_
of_3, 2010.
[2] Why Enterprises Are Uninterested in NoSQL -Communications of the
ACM.http://cacm.acm.org/blogs/blog-cacm/99512-why-enterprises-are-uninterested-in-
nosql/fulltext,2010.
[3] CAP Theorem, Eventual Consistency, NoSQL.http://venublog.com/2010/04/07/cap-theorem-
eventual-consistency-nosql/,2010.
[4] My Thoughts on NoSQL.http://www.eflorenzano.com/blog/post/my-thoughts-nosql/,2009.
[5] The dark side of NoSQL.http://codemonkeyism.com/dark-side-nosql/, 2009.
[6] CAP Confusion: Problems with Ypartitiontolerance- Cloudera - Apache Hadoop for the
Enterprise.http://www.cloudera.com/blog/2010/04/cap-confusion-problems-with-partition-
tolerance/, 2010.
[7] NoSQL: A Modest Proposal. http://voodootikigod.com/nosql-a-modest-proposal,
2009.

14. Thank You