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MongoDB 1.4发布笔记

MongoDB 1.4发布笔记¶

升级¶

We’re pleased to announce the 1.4 release of MongoDB. 1.4 is a drop-in replacement for 1.2. To upgrade you just need to shutdown mongod, then restart with the new binaries. (Users upgrading from 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:

核心服务器增强¶

concurrency improvements
indexing memory improvements
background index creation
better detection of regular expressions so the index can be used in more 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 serverStatus command (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

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