因为增量索引可以添加和删除条目，所以多个执行任务可导致重复或丢失项。
As incremental indexing can add and delete entries, multiple executing tasks can lead to duplicate or missing entries.
这意味着，DB 2从重新构建和增量索引维护两种方法中选择最合适的方法。
This means that DB2 chooses either the rebuild or incremental index maintain approach, whichever is the best fit.
增量备份允许只备份自上一次备份以来发生变化的索引和数据页。
Incremental backup allows you to back up only index and data pages that have changed since a previous backup.
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