Orient DB 是一个可伸缩的文档数据库，支持 ACID 事务处理。使用 Java 5 实现。
OrientDB is a deeply scalable Document-Graph DBMS with the flexibility of the Document databases and the power to manage links of the Graph databases. It can work in schema-less mode, schema-full or a mix of both. Supports advanced features such as ACID Transactions, Fast ">Indexes, 820.html">Native and SQL queries. It imports and exports documents in JSON. Graphs of hundreads of linked documents can be retrieved all in memory in few milliseconds without executing costly JOIN such as the Relational DBMSs do.
OrientDB uses a new indexing algorithm called MVRB-Tree, derived from the Red-Black Tree and from the B+Tree with benefits of both: fast insertion and ultra fast lookup.
The transactional engine can run in distributed systems supporting up to 9.223.372.036 Billions of records for the maximum capacity of 19.807.040.628.566.084 Terabytes of data distributed on multiple disks in multiple nodes.
OrientDB 1.0rc1更新日志：
- New defrag algorithm to reduce holes and therefore disk space
- New super fast lazy collections that optimizes marshalling/unmarshalling
- HTTP protocol handles multipart requestes
- New HTTP Download and Upload commands
- Fixed problems with cluster configuration when multiple dbs was opened
- Added 8 new configuration parameters
- new OLockManager class to lock at record level
- Many bugs fixed
下载地址：http://orient.googlecode.com/files/orientdb-1.0rc1.zip
SHA1 Checksum: 059fb2a57376d43c5f99af729ec000070b0db6e4
测试地址：http://www.moobilis.com:2480/studio/