MongoDB Basics

Installing MongoDB

Community edition Setup

• Installation steps can be found at https://docs.mongodb.com/manual/tutorial/install-mongodb-on-windows/

• Inshort download windows installer from https://www.mongodb.com/download-center/community

  

• Linux installation (MD)

• MongoDB free tutorials at Link

• MongoDB docs Link

• Others :

  • Use MongoDB compass as UI tool (+ https://robomongo.org/download Robo 3T)
  • Use shell for command interface (mongo.exe -> say C:\Program Files\MongoDB\Server\4.0\bin\mongo.exe)

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• CREATE (MD)
• READ (MD)
• UPDATE (MD)
• DELETE (MD)

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• INDEXES (MD)
• Aggregation (MD)
• Validation (MD)
• Security (MD)
• Shell Commands (MD)
• Capped Collections (MD)
• DB backup (MD)

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• Multi document transaction (MD)
• Views

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Replicas

• Docs
• Config
• FAQ
• Backup/ fault tolerancy //must
• improved read performance (like load balancer) //little sync latency issue

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Sharding

• Docs
• To use more computing power, spreading data across nodes Note : queries run across all shards / use shardKey to target specific

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• Foreign Keys
• MongoDB locks scenario
• MongoDB Limits
• MongoDB BsonTypes
• MongoDB ConfigFile
• MongoDB Compass
• MongoDB charts (enterprise)
• MongoDB Stitch (serverless platform) //cloud
• MongoDB Realm //cloud & moobile sync
• https://docs.mongodb.com/manual/core/gridfs/

Other links

• https://www.mongodb.com/products/consulting
• For more information, please visit mongodb.com or contact us at sales@mongodb.com.
• Case Studies
• Presentations
• Free Online Training
• Webinars and Events
• Documentation
• MongoDB Atlas database as a service for MongoDB
• MongoDB Enterprise Download
• MongoDB Stitch Serverless Platform
• MongoDB Realm
• Press

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Commands

• Windows to stop service through command (or do it from services.msc UI)

  net stop MongoDB

• MongoD Docs

• Start manually MongoDB server with default DB path (/data/db at root level)

  mongod

  Note : default database folder path must exist. In windows - with in installed folder say 'E:\mongodb_storage\Server\4.0\data\db'

  Check all arguments options like --logpath, --dbpath, --config ..etc

  mongod --help

  Note : Use --directoryperdb setting else all collection files are stored in root folder. (Each database will be stored in a separate directory)

• To Start MongoDB server with custom DB path

  sudo mongod --dbpath "/custom/linux/Path" --port 27018

  mongod --dbpath "drive:\custom\win\Path" --port 27018

  Note: sudo : it asks for password if permission doesn't exist //so command doesnot fail

• Mongo Shell Docs if port is changed then open shell with port //mongo --port 27018 Can open shell with help //mongo --help //--host, --username, --password, --nodb (to just execute some JS)

• Common with in shell commands :
  help

  show dbs //even shows size

  show collections

  db //check current db

  use db_name //will be created if not exists

  db.stats()
  .pretty() at the end of query for formatted JSON o/p

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Open connections

To check no of open connections (Note: clusterMonitor role must be added to the user)

use admin

db.auth('user','pwd')

db.serverStatus().connections

To find sources of connections (say source ip adress)

sudo lsof | grep mongod | grep TCP

Note : check (ESTABLISHED) message in the lines

• Restart mongodb instance to kill most connections

White paper

• RDBMStoMongoDBMigration.pdf added in current folder