maintenance task的用法和样例：
例句
- Optimizer statistics are automatically refreshed using the automatic maintenance task infrastructure.
优化器的统计信息是使用自动维护任务基础结构来进行刷新的。 - The costs of maintenance tasks are to be monitored for the individual areas of your system or operational structure.
为系统各领域或操作结构监视维护任务成本时。
