压缩比是从单个产品的日志文件标记录出来的。
The compression ratios were noted from individual products' log files.
减小邮件文件的大小可以提高视图索引编制、压缩、备份还原和事务日志记录的性能。
Reducing mail file size improves performance of view indexing, compact, backup and restore, and transaction logging.
而且，一些主要DBMS已经提供了简洁而有效的文本文件或压缩记录样式的转储。
Furthermore, major DBMSs already provide compact and efficient flat-file or packed-record-style dumps.
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