What are the interview questions for MongoDB?
MongoDB Interview Questions
- What are NoSQL databases?
- What kind of NoSQL database MongoDB is?
- Which are the most important features of MongoDB?
- What is a Namespace in MongoDB?
- Which all languages can be used with MongoDB?
- Compare SQL databases and MongoDB at a high level.
- How is MongoDB better than other SQL databases?
Why MongoDB is known as best NoSQL database?
More than any other NoSQL database, and dramatically more than any relational database, MongoDB’s document-oriented data model makes it exceptionally easy to add or change fields, among other things. So if a developer needs to quickly evolve an application, MongoDB’s flexible data model facilitates this.
What is the architecture of MongoDB?
It is an architecture that is built on collections and documents. The basic unit of data in this database consists of a set of key-value pairs. It allows documents to have different fields and structures. This database uses a document storage format called BSON which is a binary style of JSON documents.
What are the key the components of MongoDB architecture?
Key Components of MongoDB Architecture. _id – This is a field required in every MongoDB document. The _id field represents a unique value in the MongoDB document. The _id field is like the document’s primary key.
What is schema in MongoDB?
A schema is a JSON object that defines the the structure and contents of your data. You can use App Services’s BSON schemas, which extend the JSON Schema standard, to define your application’s data model and validate documents whenever they’re created, changed, or deleted.
What is the maximum document size in MongoDB?
Document Size Limit The maximum BSON document size is 16 megabytes. The maximum document size helps ensure that a single document cannot use excessive amount of RAM or, during transmission, excessive amount of bandwidth. To store documents larger than the maximum size, MongoDB provides the GridFS API.
What is namespace in MongoDB?
A namespace is a canonical name for a collection or index in MongoDB. The namespace is basically a combination of the database name and the name of the collection or index, like so: [database-name]. [collection-or-index-name] .
Which architecture does NoSQL follow?
NoSQL follows BASE property. Unlike ACID it is not the set of property but simple guidelines. BA-basic availability, S-soft state and E-eventual consistency. Unlike structured database, data in NoSQL is stored in Key-Value format.
What are columns called in MongoDB?
In MongoDB, there is no concept of columns since MongoDB is schema-less and does not contain tables. It contains the concept of collections and a collection has different types of documents to store items.
How does MongoDB store internal data?
MongoDB stores data objects in collections and documents instead of the tables and rows used in traditional relational databases. Collections comprise sets of documents, which are equivalent to tables in a relational database. Documents consist of key-value pairs, which are the basic unit of data in MongoDB.
Why Mongoose is used in MongoDB?
Advantages of Mongoose module: Collection validation of the MongoDB database can be done easily. Predefined Structure can be implemented on the collection. Constraints can be applied to documents of collections using Mongoose.
Is there primary key in MongoDB?
All documents in a MongoDB collection have a primary key dubbed _id . This field is automatically assigned to a document upon insert, so there’s rarely a need to provide it.
What are limitations of MongoDB?
There are a few disadvantages of the MongoDB NoSQL database as well. MongoDB uses high memory for data storage. There is a limit for document size, i.e. 16mb. There is no transaction support in MongoDB.
Does MongoDB have primary key?
What is the maximum size of document in MongoDB?
The maximum size an individual document can be in MongoDB is 16MB with a nested depth of 100 levels. Edit: There is no max size for an individual MongoDB database.
Is MongoDB OLTP or OLAP?
MongoDB is designed for OLTP workloads, so more transactional, online, realtime workloads.
Can NoSQL handle unstructured data?
Flexibility: NoSQL databases generally provide flexible schemas that enable faster and more iterative development. The flexible data model makes NoSQL databases ideal for semi-structured and unstructured data.
What is the MongoDB architecture?
– The document data model – presenting you the best way to work with data. – A distributed systems design – allowing you to intelligently put data where you want it. – A unified experience that gives you the freedom to run anywhere – allowing you to future-proof your work and eliminate vendor lock-in.
What are the features of MongoDB?
What are the advantages of using MongoDB?
Document Oriented Storage − Data is stored in the form of JSON style documents.
What are the best tutorials for MongoDB?
Learn MongoDB : Leading NoSQL Database from scratch. This is a great place to get started with MongoDB and in this tutorial,the instructor starts the video tutorial by explaining