OrientDB 2.1-rc1 发布，此版本解决了 104 个 issues，主要更新内容如下：
Schema:
Support for Multiple inheritance where classes can extend from multiple super classes
Support for default values (functions are allowed)
Core:
Improved WAL management (Journal) to enforce Consistency with transactions
Fetch-plan supports wildcard for names
SQL:
New SQL parser by default on with new databases and off with those created with old versions
Prepared Statements and substitution of parameters and target
New Live Query to write Reactive applications
New optimization about using of indexes in sub-classes if present
New concat() function
Distributed:
Support for slave (read-only) nodes
Included Hazelcast-all.jar including also Cloud support
ETL:
Skip duplicated vertices
Bug fixing: 104 issues in total
此版本现已提供下载：
https://github.com/orientechnologies/orientdb/archive/2.1-rc1.zip
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。
来自:开源中国社区
