MongoDB

Installation

In ubuntu, add the package mongodb-clients and mongodb-server.

Configuration

/etc/mongodb.conf holds the server configuration.

bind_ip

bind_ip tells the server which interfaces to listen on. It is comma separated.

Client

From your shell, run mongo.

Databases

A database holds many collections.

Show databases

One mongod server may hold many databases.

> show dbs
database        0.0625GB
example 0.0625GB
exampledb       0.0625GB
rover1  0.0625GB

Database creation

From the client, to create a ‘example’ database, switch to the database and create a collection by inserting a document.

> use example
switched to db example
> db.exampleCollection.insert({})
WriteResult({ "nInserted" : 1 })

Current database

The client has a current database. Run db by itself to find out what it is.

> db
example

Collections

See collections.

mongodump and mongorestore

This is used for backing up and restoring documents.

To dump only a single database, use

mongodump -d db_name

This will create a directory dump/db_name/ with various json and bson files inside it.

When restoring, use the --drop option to drop each collection before repopulating it.

The dump may be restored to another database. Copy the all the files in dump/ to the target mongodb server. Then restore it to a new database named foo_db.

mongorestore dump/db_name/ --db=foo_db