缓冲区被调优之后，就能够通过查询它来验证调优效果或捕捉备份中的配置，这十分有帮助。
Once they have been tuned, it is helpful to be able to inquire on them to verify the tuning or to capture the configuration in a backup.
值得注意的是，临时表空间和空闲dm s盘区(extent)不是备份镜像的一部分。
It is also worth noting that temporary table Spaces and free DMS extents are not part of the backup image.
备份实用程序在到达磁盘之前在缓冲区中压缩数据。
The backup utility compresses the data before hitting the disk, in the buffer.
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