Introduction to MongoDB collection.totalIndexSize() Method

totalIndexSize() is a method in MongoDB that can be used to get the total size of all indexes in a collection.

Syntax

The syntax of the totalIndexSize() method is as follows:

db.collection.totalIndexSize()

Here, db.collection refers to the collection for which you want to retrieve the information.

Use Cases

The totalIndexSize() method is usually used to obtain the total size of all indexes in a collection. This method can help you understand the size of the indexes on disk, in order to optimize and tune them.

Examples

Here is an example of using the totalIndexSize() method to get the total size of all indexes in a collection.

Assume we have a collection named products with the following 4 documents:

{ "_id": 1, "name": "Product 1", "price": 10 }
{ "_id": 2, "name": "Product 2", "price": 20 }
{ "_id": 3, "name": "Product 3", "price": 30 }
{ "_id": 4, "name": "Product 4", "price": 40 }

We can create an index for the products collection and use the following code to get the total size of all indexes in the products collection:

db.products.createIndex({ name: 1 })
db.products.totalIndexSize()

After running the above code, the following result will be returned:

4096

Conclusion

The totalIndexSize() method is a method in MongoDB that can be used to obtain the total size of all indexes in a collection. When using this method, you only need to specify the collection for which you want to retrieve the information. After executing this method, the sum of the sizes of all indexes on disk will be returned.