如果服务必须执行复杂的查询或者存储过程才能获得所需的数据，则会影响到服务的性能，进而导致服务质量下降。
If the service has to execute complex queries or stored procedures to get the required data, then the performance of the service will be at stake, reducing the quality of service.
提供对高级交互功能(例如，事务、存储转发、基础设施服务、安全以及服务质量)的支持。
Provide support for advanced service interaction capability (transactions, store and forward, infrastructure services, security, and quality of service, for example).
然而，数据网格通过提供调度、资源管理、存储保留、服务质量保证、监视和其他功能，从而优于Web服务。
However, a data grid goes beyond the Web service model by providing scheduling, resource management, storage reservations, quality-of-service assurance, monitoring, and other capabilities.
通常，服务质量(QoS)1或2(以后将有更多这样的服务质量级别)主题上的消息存储在当前没有连接的订阅服务器的代理中。
Generally, messages on topics with a Quality of Service (QoS) 1 or 2 (more on this later) are held on the broker for subscribers that are not currently connected.
通常，服务质量(QoS)1或2(以后将有更多这样的服务质量级别)主题上的消息存储在当前没有连接的订阅服务器的代理中。
Generally, messages on topics with a Quality of Service (QoS) 1 or 2 (more on this later) are held on the broker for subscribers that are not currently connected.
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