Release Notes for MongoDB 1.4

Upgrading

We’re pleased to announce the 1.4 release of MongoDB. 1.4 is a drop-inreplacement for 1.2. To upgrade you just need to shutdownmongod, then restart with the new binaries. (Users upgradingfrom release 1.0 should review the 1.2 release notes,in particular the instructions for upgrading the DB format.)

Release 1.4 includes the following improvements over release 1.2:

Core Server Enhancements

• concurrency improvements
• indexing memory improvements
• background index creation
• better detection of regular expressions so the index can be used inmore cases

Replication and Sharding

• better handling for restarting slaves offline for a while
• fast new slaves from snapshots (—fastsync)
• configurable slave delay (—slavedelay)
• replication handles clock skew on master
• $inc replication fixes
• sharding alpha 3 - notably 2-phase commit on config servers

Deployment and Production

• configure “slow threshold” for profiling
• ability to do fsync + lock for backing up raw files
• option for separate directory per db (—directoryperdb)
• http://localhost:28017/_status to get serverStatus via http
• REST interface is off by default for security (—rest to enable)
• can rotate logs with a db command, logRotate
• enhancements to serverStatuscommand (db.serverStatus()) - counters and replication lag stats
• new mongostat tool

Query Language Improvements

• $all with regex
• $not
• partial matching of array elements $elemMatch
• $ operator for updating arrays
• $addToSet
• $unset
• $pull supports object matching
• $set with array indexes

Geo

• 2d geospatial search
• geo $center and $box searches