OrientDB 2.1-rc1 发布，文档数据库
5月23日 西安 OSC 源创会开始报名啦，存储、虚拟机、Docker 等干货分享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。
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