The dropDatabase() Method - To Drop Database

The db.dropDatabase() command is used to drop the current database and associated data files to that database.  The db.dropDatabase() wraps the dropDatabase command.

Syntax:

Basic syntax of db.dropDatabase() command is:

> db.dropDatabase()
Note: This command will delete the selected database. If you haven't selected any database, then it will delete the test database, which is default database.

Example:
If you want to delete the existing database <mytestdb>, then db.dropDatabase() command will be as follows:

> use mytestdb
switched to db mytestdb

> db.dropDatabase()
{"dropped" : "mytestdb",  "ok" : 1}   (If there is data in Database)
or
{"ok" : 1}    (If there is no data in Database)

You can also drop database using dropDatabase command:

Syntax:

> use mytestdb
switched to db mytestdb

> db.runCommand({dropDatabase : 1})
{"dropped" : "mytestdb",  "ok" : 1}   (If there is data in Database)
or
{"ok" : 1}    (If there is no data in Database)

Note: This command obtains a global write lock, so it will all other operations until it has completed.