可以使用ubik协议跨多个服务器机器来持续复制数据库，比如VLDB、ADB和PDB，以提高它们的可用性，以及共同承担复制站点间的访问负荷。
Ubik protocol helps to replicate databases such as VLDB, ADB and PDB consistently across multiple server machines to improve their availability and share access loads among replication sites.
由于应用服务器使用有限的线程池，持续使用一个线程将使应用服务器在使用这些协议发送和接收消息时无法处理其他请求。
Because application servers use limited thread pools, continuous use of a thread prevents an application server from handling other requests while sending or receiving a message using these protocols.
大学与建筑承办商有持续的协议，承办商有责任为他们雇用的工人提供膳食服务及用餐设施；
The University has an on-going contractual agreement with all construction contractors that they have the responsibility to provide catering and dining facilities to their respective workers.
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