MongoDB is an open-source document database that provides high performance, high availability, and automatic scaling.
In simple words you can say that - Mongo DB is a document oriented database. It is an open source product, developed and supported by a company named 10gen.
MongoDB is available under General Public license for free and it is also available under Commercial license from the manufacture.
The manufacturing company 10 gen has given the definition of Mongo DB:
"Mongo DB is scalable, open source, high performance, document oriented database." - 10 gen
MongoDB was designed to work with commodity servers. Now it is used by company of all sizes, across all industry.
Purpose to build MongoDB
This may be a very genuine question that - "what was the need of MongoDB although there were many databases in action?"
This is a very simple answer:
All the modern applications require big data, fast features development, flexible deployment and the older database systems not enough competent, so the MongoDB was obviously needed.
Main purpose to build MongoDB:
- Scalability
- Performance
- High Availability
- Scaling from single server deployments to large, complex multi-site architectures.
Key points of MongoDB
- Develop Faster
- Deploy Easier
- Scale Bigger
Most Popular Questions for MongoDB Interviews.
| What is MongoDB and Why we use? |
| Is MongoDB Support Relationship? |
| What are journaling in MongoDB? |
| In MongoDB, What is a namespace? |
| Do MongoDB databases have tables and schemas? |
| Which are the most powerful features in MongoDB? |
| Is NoSQL Database Types? |
| Does MongoDB support SQL Server? |
| What is the difference between MongoDB and CouchDB? |
| How MongoDB is better than other SQL Server databases? |
| Now days, what makes MongoDB best? |
| What are 32-bit nuances? |
| Why does Profiler use in MongoDB? |
| In MongoDB, What is Aggregation? |
| Why MongoDB data files so large (in size)? |
| Is MongoDB support null values? |
| In MongoDB, What is the Master or primary key? |
| In MongoDB, How does sharding work with replication? |
| How can I see the connections which you used in mongos? |
| In MongoDB, What is Replication Factor? |
| In MongoDB, What is BSON and how can restore this file? |
| In MongoDB, What is Replication? |
| In MongoDB, if user removed to object attribute that attribute is deleted from the storage layer? If yes, then how? |
| In MongoDB, How to update operations immediately sync to disk? |
| In MongoDB, How sharding and replication work together? |
| Does MongoDB handle application level caching? |
| Does MongoDB run on Amazon EBS? |
| How can you enter multi line operations in the mongo shell? |
| Is mongo shell supported to tab completion? |
| Can you edit long shell operations with an external text editor? |
| How do you see the locking status in mongo instances? |
| In MongoDB, Which operations lock the database? |
| In MongoDB, Can you lock more than one database at the same time? |
| How to know, what indexes exist in a collection? |
| What happen when an index does not fit into RAM? |
| What's New in MongoDB 3.2? |
| Is MongoDB Support Replication? |
| What kind of database is MongoDB? |
| In which language MongoDB is written? |
| What types of languages use to work with MongoDB? |
| What is NoSQL Database and why you use NoSQL Database? |
| Is NoSQL Database will replace to RDBMS? |
| Does MongoDB support ACID Transactions? |
| What are different between MongoDB and Sql Server databases? |
| What are difference between SQL Server and NoSQL Database? |
| How to create primary/foreign key relationships in MongoDB? |
| Can MongoDB used for Cache Management? |
| In MongoDB, What is a covered query? |
| In MongoDB, What is Sharding? |
| In MongoDB, What is GridFS? |
| In MongoDB, How do I do transactions/locking? |
| In MongoDB, What is secondary or slave? |
| In MongoDB, Can I remove old files in the move Chunk directory? |
| What are the limitations of MongoDB? |
| In MongoDB, What is dynamic Schema? |
| In MongoDB, How can you take database backup? |
| In MongoDB, What is the role of 8 Analysers? |
| In MongoDB, Whether use to safe backup log feature? |
| In MongoDB, How to perform transactions/lock? |
| In MongoDB, How do you configure to cache size for MMAPv1? |
| Why MongoDB logging so many “Connection Accepted” events? |
| In MongoDB, How is Query injection and how to handle it? |
| How can you access different databases temporarily? |
| How can you customize to mongo shell prompt? |
| What types of locking use in MongoDB? |
| Can you perform read/write operation for ever yield lock? |
| In MongoDB, Which commands you use to lock the database? |
| How to create Index after every query insert? |
| How to determine the size of an index? |
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