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MongoDB Tutorial

MongoDB: db.collection. dropIndexes() method

db.collection.dropIndexes

The db.collection.dropIndexes() method is used to drop all indexes other than the required index on the _id field. Only call dropIndexes() as a method on a collection object.

Syntax:

db.collection.dropIndexes()

Example: MongoDB: db.collection.dropIndexes() method

Here we have create a duplicate of restaurants collection restaurants1 and the following indexes we have created on restaurants1 collection.

> db.restaurants1.getIndexes();
[
        {
                "v" : 1,
                "key" : {
                        "_id" : 1
                },
                "name" : "_id_",
                "ns" : "test.restaurants1"
        },
        {
                "v" : 1,
                "key" : {
                        "cuisine" : 1
                },
                "name" : "cuisine_1",
                "ns" : "test.restaurants1"
        },
        {
                "v" : 1,
                "key" : {
                        "cuisine" : 1,
                        "address.zipcode" : -1
                },
                "name" : "cuisine_1_address.zipcode_-1",
                "ns" : "test.restaurants1"
        }
]

The single field index on the fieldcuisinehas the user-specified name ofcuisine_1and the index specification document of{"cuisine":1} and a compound index on thecuisinefield (in ascending order) and the zipcodefield (in descending order.).

Now, the following statement will drop all the indexes from restaurants1 collection.

db.restaurants1.dropIndexes();

Here is the output

{
        "nIndexesWas" : 2,
        "msg" : "non-_id indexes dropped for collection",
        "ok" : 1
}

Now, lists the indexes again.

> db.restaurants1.getIndexes();
[
        {
                "v" : 1,
                "key" : {
                        "_id" : 1
                },
                "name" : "_id_",
                "ns" : "test.restaurants1"
        }
]

Retrieve the restaurants data from here



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