分段和PD Q优先级也对于数据的检索速度有极大的影响，并有助于表扫描。
Fragmentation and PDQ priority also have a huge effect on the speed of data retrieval and will help table scans.
分段的最终目标就是通过直接访问来包含满足SQL查询的数据分段表，减少检索时间。
The ultimate goal of fragmentation is to reduce the retrieval time by directly accessing the fragment that contains the data that satisfies the SQL query.
在提出一种新闻视频检索系统结构的基础上，介绍了基于标题条检测的新闻场景分段索引方法，并阐述了两种新闻摘要的生成策略。
On the basis of a existing news video retrieval system, this paper introduces a method for news video indexing by scenes and two ways of content based summary, using caption detection.
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