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MongoDB 2.2中的修改

• Release Notes for MongoDB 2.2
  • 升级
    • 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 2.2 Output Incompatible with Pre-2.2 mongorestore
      • 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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