Installation of Mongo DB | No-Sql mongo db installation steps on Linux | mongo db comands

Installation of Mongo DB for 64 bit Linux

 

What is Mongo DB ? 

---  MongoDB is a cross-platform document-oriented database that is defined as a NoSQL database, MongoDB eschews the traditional table-based relational database structure in favor of JSON-like documents with dynamic schemas (MongoDB calls the format BSON), making the integration of data in certain types of applications easier and faster. Released under a combination of the GNU Affero General Public License and the Apache License, MongoDB is free and open-source software.

Website :- http://www.mongodb.com/

-----------------------------Steps for Mongo DB installation on Linux -----------------------------------------

Step 1 :-  Select the directory under which you want to install mongo db and check all the permission is assigned to your user for this directory or not. example :- read, write and execute.

Step 2 :-  Copy the installer file (mongodb-linux-x86_64-2.6.1.tar.gz ) for Linux into the directory created into step 1.

Step 3. Extract the files from the installer through tar command.

$ tar -zxvf mongodb-linux-x86_64-2.6.1.tar.gz

Step 4 :-  ensure the location of the binaries is set in the PATH variable.

export PATH=<mongodb-install-directory>:$PATH

Here replace <mongodb-install-directory> with the path of mongo-Db binaries.

Step 5 :-  Create some folder or directories under the mongo db home..

-  bin

-  data

-  log

Before starting installation, User needs to create some config file and folders for mongo db installation as below

-- for mongo db process , create /data/db directory. If we create any other directory than we need to specify DBPATH variable in mongo.cfg   (config file) to start mongo db process on the Linux box.

Example :-  

DBPATH= /opt/app/mongodb/mongodb-linux-x86_64-2.4.1/data/db

---- for logs

MONGOD.log=/opt/app/mongodb/mongodb-linux-x86_64-2.4.1/log

Step 6 :-   Also we have to create a mongod.config file under mongo db home directory that will have all the details and paths required to run mongod process on Linux. For example see below path

mongod.config=/opt/app/mongodb/mongodb-linux-x86_64-2.4.1/

Step 7 :-   To start mongo db, execute below command from the bin directory of mongo db

$ mongod --config /opt/app/mongodb/mongodb-linux-x86_64-2.4.1/mongod.config  --dbpath  /opt/app/mongodb/mongodb-linux-x86_64-2.4.1/data/db  &

Here "& " will run the mongo db process in background.

 

 Using Mongo DB:

       Since Mongo DB is a NoSQL DB, we can create our DB and use them from command prompt.

        Some Useful commands to work with Mongo DB:
       
        Using the Mongo Shell (mongo.exe), you can interact with Mongo DB from the command line.

         [INFORMATIONAL] Commands

         1) Get information on the host running  MongoDB

              db.adminCommand( { "hostInfo" : 1 } )

         2) Get Mongo DB version details:

             db.runCommand( { buildInfo: 1 } )

         3) Get Mongo DB status:

            db.runCommand( { serverStatus: 1, workingSet: 1 } )

         4) Get disk storage use by database:

            show dbs

         5) Select the ‘admin’ database, and query for a list of databases in the Mongo DB instance:

           use admin
           db.runCommand( { listDatabases: 1 } )

 

         6) Get stats about the ‘admin` database:

            db.stats()


         7) Get stats about the ‘blobs’ collection:
            db.blobs.stats()


         8) Counts the number of all documents in the collection “nodes”:
           db.runCommand( { count: 'nodes' } )


         9) Get information on users defined
           db.runCommand( { usersInfo: 1 } )



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