MongoDB Session 1
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This document appears to be a series of slides from a presentation on MongoDB and NoSQL databases. It includes definitions of units of storage like bytes, kilobytes and gigabytes. It also discusses some problems with relational databases that led to the development of NoSQL databases, like rigid schemas and difficulties scaling. Key aspects of NoSQL databases are introduced, including concepts like CAP theorem, consistency, availability and partitioning tolerance. ACID properties of transactions are compared to BASE properties that are more common in NoSQL databases.
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MongoDB Session 1
- 1. Slide 1 of 20© People Strategists www.peoplestrategists.com MongoDB (Session-1)
- 2. Slide 2 of 20© People Strategists www.peoplestrategists.com Introduction to NoSQL Session 01
- 3. Slide 3 of 20© People Strategists www.peoplestrategists.com Big data An Introduction
- 4. Slide 4 of 20© People Strategists www.peoplestrategists.com
- 5. Slide 5 of 20© People Strategists www.peoplestrategists.com Unit Equals 1 Bit Binary digit 8 Bits 1 Byte 1024 Bytes 1 Kilobyte 1024 Kilobytes 1 Megabyte 1024 Megabytes 1 Gigabyte 1024 Gigabytes 1 Terabyte 1024 Terabytes 1 Petabyte 1024 Petabytes 1 Exabyte` 1024 Exabytes 1 Zetabytes 1024 Zetabytes 1 Yottabyte 1024 Yottabytes 1 Brontobyte What Next??
- 6. Slide 6 of 20© People Strategists www.peoplestrategists.com
- 7. Slide 7 of 20© People Strategists www.peoplestrategists.com RDBMS problems
- 8. Slide 8 of 20© People Strategists www.peoplestrategists.com
- 9. Slide 9 of 20© People Strategists www.peoplestrategists.com
- 10. Slide 10 of 20© People Strategists www.peoplestrategists.com Design the Models Define Objects and their relations Design the schema Design Database Create or Modify Application Application Development
- 11. Slide 11 of 20© People Strategists www.peoplestrategists.com
- 12. Slide 12 of 20© People Strategists www.peoplestrategists.com
- 13. Slide 13 of 20© People Strategists www.peoplestrategists.com Problems with rdbms • Rigid Schema • Not Application specific • Problems with Scaling Complex Joins Scaling Vertical Scaling Upper limit Involves downtime Horizontal Scaling Easy to scale dynamically Limitless Expansion No downtime issues
- 14. Slide 14 of 20© People Strategists www.peoplestrategists.com NoSQL Introduction
- 15. Slide 15 of 20© People Strategists www.peoplestrategists.com Curtains off NoSQL NOSQL is a broad term used to group databases that store and retrieve data without using the traditional tabular relations of and/or most properties of and/or rules, followed by RDBMS. Not Only SQL. Distributed Database Services. Scalability and Availability.
- 16. Slide 16 of 20© People Strategists www.peoplestrategists.com CAP’s Theorem • The CAP theorem states that there are 3 basic requirements which exist in a special relation when designing applications for a distributed architecture. • Consistency • This means that the data in the database remains consistent after the execution of an operation. • Availability • This means that the system is always on (Service guarantee availability), no downtime. • Partition Tolerance • This means that the system continues to function even if the communication among the servers is unreliable, i.e. the servers may be partitioned into multiple groups that cannot communicate with one another.
- 17. Slide 17 of 20© People Strategists www.peoplestrategists.com
- 18. Slide 18 of 20© People Strategists www.peoplestrategists.com ACID • Atomicity • you can guarantee that all of a transaction happens, or none of it does. • Consistency • you can guarantee that your data will be consistent. • Isolation • One transaction cannot read data from another transaction that is not yet completed. • Durability • Once a transaction is complete, it is guaranteed that all of the changes have been recorded to a durable medium (such as a hard disk).
- 19. Slide 19 of 20© People Strategists www.peoplestrategists.com BASE • Basically Available • The database system always seems to work! • Soft State • It does not have to be consistent all the time • Eventually Consistent • The system will eventually become consistent when the updates propagate, in particular, when there are not too many updates.
- 20. Slide 20 of 20© People Strategists www.peoplestrategists.com
- 21. Slide 21 of 20© People Strategists www.peoplestrategists.com