Top MongoDB Interview Questions

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MongoDB is a document database with the scalability and flexibility that you want with the querying and indexing that you need.
Mongodb Interview Questions
Education Funda


Let's Jump Into Directly Top 10 MongoDB Interview Questions:


Important Notes

BSON vs JSON
  • JSON is Standard File Format whereas BSON is Binary File Format.
  • BSON is faster then JSON because it is more efficient and MongoDB stores data in BSON format via MongoDB drivers data converted when we save or update any data.
  • JSON takes less storage space whereas BSON takes more space as compared between both.
  • We can embed 100 JSON formats inside JSON maximum.
  • BSON is an encoded format of data so not easily readable for humans whereas JSON we can easily read.
Objectld is composed of:
  • Timestamp
  • Client machine ID
  • Client process ID
  • 3 byte increment counter
UpdateOne() vs ReplaceOne()

With replaceOne() you can only replace the entire document, while updateOne() allows for updating fields.
 
Since replaceOne() replaces the entire document - fields in the old document not contained in the new will be lost. With updateOne() new fields can be added without losing the fields in the old document.



I hope this article will help you to crack interview easily.



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