WriteConcern in MongoDB
WriteConcern is mongodb allows developers to select how their application interacts with the database write operation and have impact on performance and data integrity.
Available modes are -
Unacknowledged
Acknowledged
Journalled
Fsynced
Replica Acknowledged
Weaker WriteConcern allows faster performance while reducing data integrity and vice versa.
This article on blog.mongodirector.com explains beautifully.











