MongoDB Introduction

Presented at the SF MongoDB/F# meetup

Transcript

1. MongoDB – An Introduction Sridhar Nanjundeswaran, @snanjund MongoDB, Inc.
2. 2 10Gen is now MongoDB 280+ employees 500+ customers Over $81 million in funding Offices in New York, Palo Alto, Washington DC, London, Dublin, Barcelona and Sydney
3. 3 Relational Database Challenges Data Types • Unstructured data • Semi-structured data • Polymorphic data Volume of Data • Petabytes of data • Trillions of records • Tens of millions of queries per second Agile Development • Iterative • Short development cycles • New workloads New Architectures • Horizontal scaling • Commodity servers • Cloud computing
4. 4 Database Landscape
5. 5 MongoDB is a ___________ database • Document-oriented • Open-source • High performance and horizontally scalable • Full featured
6. 6 Document-Oriented Database • Not .PDF & .DOC files • A document is essentially an associative array – JSON object, PHP Array, Python Dictionary, etc. • BSON – www.bsonspec.org
7. 7 Open-Source • MongoDB is an open-source project • On GitHub • Database licensed under the AGPL • Drivers licensed under Apache
8. 8 High Performance and Horizontally Scalable • High performance – Written in C++ – Data serialized as BSON (fast parsing) – Full support for primary & secondary indexes • Horizontally scalable – Auto-sharding – Scale across • Commodity hardware • Cloud compute • Hybrid
9. 9 Full Featured • Rich Ad Hoc queries • Real time aggregation • Geospatial features • Native bindings for most programming languages
10. 10 MongoDB is a Single-Master System • All writes are to a primary (master) • Failure of the primary is detected, and a new one is elected • Application writes get an error if there is no quorum to elect a new master – Reads can continue
11. 11 MongoDB Storage Management • Data is kept in memory-mapped files • Files are allocated as needed • Indexes (B*-trees) point to documents using geographical addresses
12. 12 Reliability – Replica Sets
13. 13 Scalability – Auto-sharding
14. 14 Relational Schema
15. 15 MongoDB Schema
16. 16 > db.users.findOne() { "_id" : ObjectId("50804d0bd94ccab2da652599"), …, ”tag_count” : 2, ”tags” : ["superuser", ”dbadmin"], "address" : {"street" : "555 University Avenue", "city": "Palo Alto”} } User document
17. 17 Terminology RDBMS Mongo Table, View Collection Row(s) Document Index Index Join Embedded Document Partition Shard Partition Key Shard Key
18. 18 Official MongoDB Drivers
19. 19 MongoDB drivers • Official Support for 13 languages • Community drivers for tons more – R, lua etc. • Drivers connect to mongo servers • Drivers translate BSON into native types • mongo shell is not a driver, but works like one in some ways • Installed using typical means (npm, pecl, gem, pip)
20. Sridhar Nanjundeswaran @snanjund