MongoDB supports the creation of user-defined ascending/descending indexes on a ______ field of a document.

The ______ index is unique and prevents clients from inserting two documents with the same value for the _id field.

Select the wrong statement :

MongoDB also supports user-defined indexes on multiple fields called :

MongoDB uses ______ indexes to index the content stored in arrays.

MongoDB provides a ________ index type that supports searching for string content in a collection.

Indexes are typically available in ______ or located sequentially on disk.

Select the wrong statement :

___________ is used to determine whether a query is a covered query .

The ________ message is used to update a document in a collection.