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Changes in MongoDB 2.2
Changes in MongoDB 2.2
发布于 2015-09-14 15:05:35 | 109 次阅读 | 评论: 0 | 来源: 网络整理
Release Notes for MongoDB 2.2
Upgrading
Synopsis
Upgrading a Standalone
mongod
Upgrading a Replica Set
Upgrading a Sharded Cluster
Changes
Major Features
Aggregation Framework
TTL Collections
Concurrency Improvements
Improved Data Center Awareness with Tag Aware Sharding
Fully Supported Read Preference Semantics
Compatibility Changes
Authentication Changes
findAndModify
Returns Null Value for Upserts that Perform Inserts
mongodump
Output can only Restore to 2.2 MongoDB Instances
ObjectId().toString()
Returns String Literal
ObjectId("...")
ObjectId().valueOf()
Returns hexadecimal string
Behavioral Changes
Restrictions on Collection Names
Restrictions on Database Names for Windows
_id
Fields and Indexes on Capped Collections
New
$elemMatch
Projection Operator
Windows Specific Changes
Windows XP is Not Supported
Service Support for
mongos.exe
Log Rotate Command Support
New Build Using SlimReadWrite Locks for Windows Concurrency
Tool Improvements
Index Definitions Handled by
mongodump
and
mongorestore
mongooplog
for Replaying Oplogs
Authentication Support for
mongotop
and
mongostat
Write Concern Support for
mongoimport
and
mongorestore
mongodump
Support for Reading from Secondaries
mongoimport
Support for full 16MB Documents
Timestamp()
Extended JSON format
Shell Improvements
Improved Shell User Interface
Helper to load Server-Side Functions
Support for Bulk Inserts
Operations
Support for Logging to Syslog
touch
Command
indexCounters
No Longer Report Sampled Data
Padding Specifiable on
compact
Command
Added Build Flag to Use System Libraries
Memory Allocator Changed to TCMalloc
Replication
Improved Logging for Replica Set Lag
Replica Set Members can Sync from Specific Members
Replica Set Members will not Sync from Members Without Indexes Unless
buildIndexes:
false
New Option To Configure Index Pre-Fetching during Replication
Map Reduce Improvements
Sharding Improvements
Index on Shard Keys Can Now Be a Compound Index
Migration Thresholds Modified
Licensing Changes
Resources
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