Difference between revisions of "MongoDB"

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(MongoDB won't more to start: Make this actually understandable)
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[[Category:Database management systems]]
 
[[Category:Database management systems]]
MongoDB (from hu'''mongo'''us) is an open source document-oriented database system developed and supported by [http://www.10gen.com/ 10gen]. It is part of the NoSQL family of database systems. Instead of storing data in tables as is done in a "classical" relational database, MongoDB stores structured data as JSON-like documents with dynamic schemas (MongoDB calls the format BSON), making the integration of data in certain types of applications easier and faster.
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MongoDB (from hu'''mongo'''us) is an open source document-oriented database system developed and supported by [http://www.10gen.com/ 10gen]. It is part of the NoSQL family of database systems. Instead of storing data in tables as is done in a "classical" relational database, MongoDB stores structured data as JSON-like documents with dynamic schemas (MongoDB calls the format [http://bsonspec.org/ BSON]), making the integration of data in certain types of applications easier and faster.
  
 
==Installing MongoDB==
 
==Installing MongoDB==
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  # cd /var/lib/mongodb
 
  # cd /var/lib/mongodb
 
  # sudo chown -R mongodb:mongodb .
 
  # sudo chown -R mongodb:mongodb .
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Check that the boost-libs package is up to date. MongoDB requires a specific version, however, the package does not restrict the version of this dependency.

Revision as of 08:24, 31 July 2013

MongoDB (from humongous) is an open source document-oriented database system developed and supported by 10gen. It is part of the NoSQL family of database systems. Instead of storing data in tables as is done in a "classical" relational database, MongoDB stores structured data as JSON-like documents with dynamic schemas (MongoDB calls the format BSON), making the integration of data in certain types of applications easier and faster.

Installing MongoDB

Install mongodb

# pacman -S mongodb

Start MongoDB

# systemctl start mongodb

(Optional) Add MongoDB to the list of daemons that start on system startup

# systemctl enable mongodb

Access the database shell

To access the Database shell you have type in your terminal

# mongo

Troubleshooting

MongoDB won't start

Check if the lock file exists

# ls  -lisa /var/lib/mongodb

If it does, stop the mongodb service, and delete the file. Then start the service again.

# rm /var/lib/mongodb/mongod.lock

If it still won't start, run a repair on the database, specifying the dbpath (/var/lib/mongodb/ is the default --dbpath in Arch Linux)

# mongod --dbpath /var/lib/mongodb/ --repair

After running the repair as root, the files got chowned to root, whilst Arch Linux runs it under a different user. You then need to chown back the files. Further reference

# cd /var/log/mongod
# sudo chown -R mongodb:mongodb .
# cd /var/lib/mongodb
# sudo chown -R mongodb:mongodb .

Check that the boost-libs package is up to date. MongoDB requires a specific version, however, the package does not restrict the version of this dependency.