In previous section we have discussed some example related to MongoDB with Java. In this section, we will understand some more Advance Database and Shell command
Advance Database command
| Command | Descriptions |
| db.addUser() | Adds a user to a Database and allows administrators to configure the user’s privileges |
| db.addauth() | Authenticates a user to a database |
| db.changeUserPassword() | Changes an existing user’s password |
| db.cloneCollection() | Copies data directly between MongoDB instances. Wraps cloneCollection. |
| db.cloneDatabase() | Copies a database from a remote host to the current host. Wraps clone. |
| db.commandHelp() | Returns help information for a database command. |
| db.createCollection() | Creates a new collection. Commonly used to create a capped collection. |
| db.currentOp() | Reports the current-in-progress operations. |
| db.dropDatabase() | Removes the current database. |
| db.eval() | Passes a JavaScript function to the mongod instance for server-side JavaScript evaluation. |
| db.fsyncLock() | Flushes writes to disk and locks the database to prevent write operations and assist backup operations. Wraps fsync. |
| db.getCollection() | Returns a collection object. Used to access collections with names that are not valid in the Mongo Shell. |
| db.getCollectionNames() | Lists all collections in the current database. |
| db.getLastError() | Checks and returns the status of the last operation. Wraps getLastError. |
| db.getMongo() | Returns the Mongo() connection object for the current connection. |
| db.getName() | Returns the name of the current database. |
| db.getPrevError() | Returns a status document containing all errors since last error reset. Wraps getPrevError. |
| db.getProfilingStatus() | Returns a document that reflects the current profiling level and the profiling threshold. |
| db.getReplicationInfo() | Returns a document with replication statistics. |
| db.getSiblingDB() | Provides access to the specified database. |
| db.help() | Displays descriptions of common db object methods. |
| db.hostInfo() | Returns a document with information about the system MongoDB runs on. Wraps hostInfo. |
| db.isMaster() | Returns a document that reports the state of the replica set. |
| db.killOp() | Terminates a specified operation. |
| db.listCommands() | Displays a list of common database commands. |
| db.loadServerScripts() | Loads all scripts in the system.js for the current database into the shell session. |
| db.logout() | Ends an authenticated session. |
| db.removeUser() | Removes a user from a database. |
| db.repairDatabase() | Runs a repair routine on the current database. |
| db.resetError() | Reset the error message returned by db.getPrevError() and getPrevError. |
| db.runCommand() | Runs a database command. |
| db.serverBuildInfo() | Returns a document that displays the compilation parameters for the mongod instance. Wraps buildinfo. |
| db.serverStatus() | Returns a document that provides an overview of the state of the database process. |
| db.setProfilingLevel() | Modifies the current level of the database profiling. |
| db.shutdownServer() | Shuts down the current mongod or mongos process cleanly and safely. |
| db.stats() | Returns a document that reports on the state of the current database. |
| db.version() | Returns the version of the mongod instance. |
Some Mongo Shell command
| Command | Description |
| db.collection.count() | Wraps count to return a count of the number of documents in a collection or matching a query. |
| db.collection.createIndex() | Builds an index on a collection. Use db.collection.ensureIndex(). |
| db.collection.getIndexStats() | Renders a human-readable view of the data collected by indexStats which reflect B-tree utilization. |
| db.collection.dataSize() | Returns the size of the collection. Wraps the size field in the output of the collStats. |
| db.collection.distinct() | Returns an array of documents that have distinct values for the specified field. |
| db.collection.drop() | Removes the specified collection from the database. |
| db.collection.dropIndex() | Removes a specified index on a collection. |
| db.collection.dropIndexes() | Removes all indexes on a collection. |
| db.collection.ensureIndex() | Performs a query on a collection and returns a cursor object. |
| db.collection.renameCollection() | Changes the name of a collection. |
| db.collection.save() | Provides a wrapper around an insert() and update() to insert new documents. |
| db.collection.stats() | Reports on the state of a collection. Provides a wrapper around the collStats. |
| db.collection.storageSize() | Reports the total size used by the collection. Provides a wrapper around the storageSize field of the collStats output. |
| db.collection.totalSize() | Reports the total size of a collection, including the size of all documents and all indexes on a collection. |
| db.collection.totalIndexSize() | Reports the total size used by the indexes on a collection. Provides a wrapper around the totalIndexSize field of the collStats output. |
| db.collection.update() | Modifies a document in a collection. |
| db.collection.validate() | Performs diagnostic operations on a collection. |
In this tutorial we have understood some Advance Database and Shell command in MongoDB.