悲观会话锁定是一种序列化形式，会严重地影响系统的可用性，须小心使用。
Pessimistic session locking is a form of serialization and can severely limit system availability, and so should be used with caution.
和优化器一样，调度器使用设备架构从系统的每个组件收集有关资源可用性的度量指标。
Like the optimizer, the scheduler USES the appliance architecture to gather metrics about resource availability from each component of the system.
最后，可能仅需使用IT来确保使用适当的中间件维护系统，以及为确保系统的可用性提供监控和支持。
It might be needed only to ensure that the systems are maintained with the appropriate middleware and that monitoring and support are provided to ensure system availability.
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