MongoDB Webinar Notes

Attended MongoDB: A Quickstart Tutorial by 10gen services 

Summary of Notes from the Meeting 

• MongoDB - Primary datastore for web apps. Couple of examples on sites run using MongoDB was provided (ex-foursquare)
• Demo - Developing Location based Application, Query near by places (Restaurants)
• Data is stored as Documents. Key value pair based storage
• Data stored within collection has no schema defined, Generally Each collection will be similar information stored. 3 collections (tables) - places, users, checkins.
• MongoDB has built in support for geo location queries
• For each record, Tips fields was added (store tags) for data inserted. This would be used for record retrieval based based on tag value
• MongoDB supports Regular Expression in queries
• MongoDB Query Operators have $ symbol ($gt - greater than, $lt - less than etc..)
• Constraints option is not available in MongoDB (Primary Key/Foreign Key)
• No concept of Isolation levels in MongoDB
• Composite Indexes (Indexes based on multiple columns) supported in MongoDB
• Aggregation group by functionality would be provided in 2.0 release
• MongoDB has no built in encryption support
• Availability and Scalability options
• Replica set support (Single primary and multiple secondary systems)
• Autosharding to achieve scalability. Routes partitions data into groups based on fields in documents

We have covered couple of examples (Table Creation / Inserting Records / Select Query / Index) in previous post. Composite Indexes, Tags, Query Operators, Geographical data support are new learning's from this session.

Good Reads
no:sql(eu) and NoSQL: What’s the deal?
Let’s play with Cassandra… (Part 1/3)
Hadoop Distributed File System : Overview & Configuration

Happy Learning!!