Top MongoDB (Non-SQL) Interview Questions: Part 3

Today we are going to discuss the top 20 MongoDB Interview Questions. This is Part 3.

Question 11: How do you skip documents in a query in MongoDB?

Answer: To skip documents in a query in MongoDB, you can use the skip() method. Here's an example:

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db.myCollection.find().skip(5)

Question 12: How do you perform a text search in MongoDB?

Answer: To perform a text search in MongoDB, you can use the $text operator and create a text index. Here's an example:

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db.myCollection.find({ $text: { $search: "keyword" } })

Question 13: How do you perform transactions in MongoDB?

Answer: To perform transactions in MongoDB, you can use the session object and the withTransaction() method. Here's an example:

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session.startTransaction();
try {
  // Perform operations
  session.commitTransaction();
} catch (error) {
  session.abortTransaction();
}

Question 14: How do you aggregate data from multiple collections in MongoDB?

Answer: To aggregate data from multiple collections in MongoDB, you can use the $lookup stage in the aggregate() method. Here's an example:

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db.myCollection.aggregate([
  {
    $lookup: {
      from: "otherCollection",
      localField: "id",
      foreignField: "id",
      as: "result"
    }
  }
])

Question 15: How do you create a backup of a MongoDB database?

Answer: To create a backup of a MongoDB database, you can use the mongodump command-line tool. Here's an example:

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mongodump --db mydatabase --out /path/to/backup

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