Free space can be managed automatically or manually. The in-segment
free/used space is tracked using bitmaps, as opposed to free lists.
segment-space management offers the following benefits:
■ Ease of use
■ Better space utilization, especially for the objects with highly varying row sizes
■ Better run-time adjustment to variations in concurrent access
■ Better multi-instance behavior in terms of performance/space utilization
[@more@]来自 “ ITPUB博客 ” ,链接:http://blog.itpub.net/10599713/viewspace-931372/,如需转载,请注明出处,否则将追究法律责任。
转载于:http://blog.itpub.net/10599713/viewspace-931372/
本文介绍了段内空闲空间的自动与手动管理方式,并详细阐述了使用位图跟踪空闲/已用空间的方法,这种方法相比自由列表具有更好的空间利用率和运行时调整能力,尤其适用于行大小变化大的对象。
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