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Re:A Year with MongoDB by geoffeg on Friday April 13, 2012 @02:47PM (#3838238)
DB-level locking is planned for MongoDB 2.2 which should be out within a few months.

https://jira.mongodb.org/browse/SERVER-4328

Re:A Year with MongoDB by spidaman on Friday April 13, 2012 @03:00PM (#3838310)
Meh, if your other option is to use PostgreSQL and get row level locks, a db level lock is still a fail.
Re:A Year with MongoDB by j-kidd on Friday April 13, 2012 @05:14PM (#3838889)
And here's a great post that provides some insight on how much effort has been put in by RDBMS vendors to handle locking:

http://stackoverflow.com/a/872808