MongoDB 2.2 Released
MongoDB 2.2 Released
Written by Kay Ewbank   
Monday, 03 September 2012

An Aggregation Framework, Data Center Awareness functionality and improvements to concurrency are the major features in the latest release of MongoDB.

The aggregation framework is designed to make it easier to manipulate and process documents inside of MongoDB without needing to use Map-Reduce or separate application processes for data manipulation. Map-Reduce isn’t ideally suited for simple aggregation tasks such as totaling or averaging field values. The developers of MongoDB say the aggregation framework provides similar functionality to GROUP BY and related SQL operators as well as simple forms of self joins.  The aggregation framework can also be used to reshape the returned data, adding computed fields, creating new virtual sub-objects, and extracting sub-fields into the top level of results.

 

 

Another improvement to the new version is better management of larger data sets that are more geographically distributed. The “Data Center Awareness” features include standard handling of read preferences across all drivers and sharded interfaces. Another feature designed for distributed clusters is tag aware sharding. This means you can ensure that data in a geographically distributed sharded cluster is always closest to the application that will use that data the most.

The other main changes to version 2.2 are in the area of concurrency. The global lock has been eliminated from the mongod process, and locking is now enforced per database.  Locking has also been strengthened with the addition of a new subsystem that avoids locks under most page-fault events, and when writing to secondaries applications handle parallelism better.

There is a video showing the concurrency changes.

More Information

MongoDB 2.2 Released

Release Notes

MongoDB Downloads

Related Articles

MongoDB in Action (book review)

 

blog comments powered by Disqus

 

To be informed about new articles on I Programmer, install the I Programmer Toolbar, subscribe to the RSS feed, follow us on, Twitter, Facebook, Google+ or Linkedin,  or sign up for our weekly newsletter.

 

Banner


Coursera and IBM Join Forces in India
05/07/2016

Coursera is partnering with IBM to strengthen the developer ecosystem in India via its Full Stack Web Development Specialization. Twenty Indian students will be awarded up to $120,000 per ye [ ... ]



Microsoft Admits 1 Billion Target Out Of Reach
19/07/2016

The writing has been on the wall for months and now Microsoft has admitted that it isn't going to meet its own target of having Windows 10 installed on 1 billion devices within 2-3 years of its releas [ ... ]


More News

Last Updated ( Tuesday, 04 September 2012 )
 
 

   
RSS feed of news items only
I Programmer News
Copyright © 2016 i-programmer.info. All Rights Reserved.
Joomla! is Free Software released under the GNU/GPL License.