iForum 2015: SQL vs. NoSQL
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The document discusses the considerations when choosing between SQL and NoSQL databases, emphasizing criteria such as scalability, durability, cost, and domain-specific requirements. It highlights the historical context of databases, various architectures, and the importance of polyglot persistence. Denis Reznik, the author and director of R&D at Intapp, shares insights on workload management and the future of database applications.
iForum 2015: SQL vs. NoSQL
- 1. SQL vs NoSQL It’s Always a Hard Choice Denis Reznik Director of R&D at Intapp Kyiv
- 2. Database History 1960s 1970s 1980s 1990s 2000s Nowadays Object Databases RDMS Commercial Success SQL RDBMS Ingress System R E.F. Codd’s Paper CODASYL IMS NoSQL (Johan Oskarsson) NewSQL (?) Google BigTable Paper Amazon Dynamo Paper
- 3. NoSQL SQL
- 4. Agenda • Criteria #1 • Criteria #2 • Criteria #3 • Criteria #4 • Criteria #5 • Criteria #6 • Criteria #7
- 5. About me • Denis Reznik • Director of R&D at Intapp Kyiv • Microsoft MVP (SQL Server) • Leader of Kyiv SQL Server User Group • Database geek • Community Enthusiast 5 |
- 9. Q&A Web Site (StackOverflow)
- 13. Sample Workload • 4 million users • 8 million questions • 40 million answers • As a network #54 site for traffic in the world • 560 million page views a month • Peak is more like 2600-3000 requests/sec on most weekdays. source: https://www.youtube.com/watch?v=t6kM2EM6so4
- 15. Scalability • Scale up • Very easy to scale • Always have a limit • Hardware is expensive • Scale-out • Relatively tricky scaling • Theoretically infinite scale • Can be done on commodity hardware
- 17. Durability ACID • D – for Durability • Not all NoSQL databases are durable (at least by default)
- 18. Cost Criteria #6
- 19. Cost • Hardware • Big servers are expensive • Small servers are cheep • Small servers can be easily replaced • License • A lot of NoSQL databases are free • There are free RDBMS as well • Scale Out is more useful for free software • Support • MSSQL forgives you more than MySQL
- 23. Real Architecture of StackOverflow source: https://www.youtube.com/watch?v=t6kM2EM6so4
- 24. Summary • Tools • Domain • Workload • Scalability • Durability • Cost • Knowledge • Polyglot Persistence
- 25. More Points • “Respect the problem” (c) • Think about the future workload grows • Think about the future application changes • Database itself, even if it is blazing fast, is not a purpose of not to use cache • Consider cloud database offers • Consider Polyglot Persistence • Consider using service for data access in application • Database load test • A/B testing
- 26. Thank you! Denis Reznik Twitter: @denisreznik Email: [email protected] Blog: http://reznik.uneta.com.ua Facebook: https://www.facebook.com/denis.reznik.5 LinkedIn: http://ua.linkedin.com/pub/denis-reznik/3/502/234