What does the insertMany method do in MongoDB?

The insertMany method in MongoDB is used to insert multiple documents into a collection in a single operation. This method is efficient for adding a batch of documents at once, reducing the number of round trips to the database compared to inserting documents one at a time.

Key Features of insertMany:

1. Batch Insertion: Allows you to insert an array of documents, making it faster than multiple individual insert operations.

2. Document Structure: Each document in the array can have a different structure, as MongoDB supports a flexible schema.

3. Acknowledgment: The method can return an acknowledgment of the operation, including the inserted document IDs.

4. Error Handling: If any document fails to insert due to validation errors or other issues, the entire operation can fail unless specified otherwise with options.

Syntax:

db.collection.insertMany(documents, options)

• documents: An array of documents to be inserted.
• options: Optional settings, such as ordered (to specify whether to stop on the first error) and writeConcern (to specify the level of acknowledgment requested).

Example:

db.students.insertMany([
    { name: "Alice", age: 20 },
    { name: "Bob", age: 22 },
    { name: "Charlie", age: 23 }
])

In this example, three student documents are inserted into the students collection in one operation.