Distributed Replicated Block Device (DRBD)提供一个网络版的数据库镜像，属于冗余磁盘阵列(RAID) RAID - 1类。

The Distributed Replicated Block Device (DRBD) provides a networked version of data mirroring, classified under the redundant array of independent disks (RAID) taxonomy as RAID-1.

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本文以SCI为例，从几个方面阐述文摘索引型数据库的光盘版与网络版的比较及文摘索引型数据库的发展趋势。

The article reviewed the SCI, many aspects are listed to comparise the SCI CDE and SCI Expanded. The article also illustrated the development trends of the bibliographic database.

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主要做了以下工作 ：论述了网络版全文数据库的评价的方法 ；

The main content is following:dissertating evaluation method of web full-text database;

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