然而，可以通过使用以cell为作用域的定制属性修改这个默认行为，将一个或多个应用服务器指定为托管目录服务。
However, you can modify this default behavior by using a cell-scoped custom property to designate one or more application servers to host the catalog service.
应用程序可以将新的对象添加到图形中，从图形中删除对象并修改对象的属性。
Applications can add new objects to the graph, delete objects from the graph, and modify attributes of objects.
由于不需要对表进行 DDL 修改即可使用针对乐观锁定的新 SQL 表达式和属性，因此可以轻松地在您的测试应用程序中尝试乐观锁定特性。
Since the new SQL expressions and attributes for optimistic locking can be used with no DDL changes to the tables involved, you can easily try optimistic locking in your test applications.
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