block分配问题。

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最近开始看concept,很多不能理解的。下面这段话什么意思?是指rac环境下block的分配问题么?求高手指教。
Although you can allocate additional extents, the blocks themselves are allocated
separately. If you allocate an extent to a specific instance, the blocks are immediately
allocated to the free list. However, if the extent is not allocated to a specific instance,
then the blocks themselves are allocated only when the high water mark moves. The
high water mark is the boundary between used and unused space in a segment.
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