Oracle11g新特性：RMAN压缩备份
Oracle10g的rman已经可以执行压缩备份，采用的压缩算法是bzip2。Oracle11g引入了一种新的压缩算法zlib。zlib的压缩率不如bzip2，但是压缩速度则要快不少。本文通过一个实验来对这两种压缩算法进行比较。
[oracle@localhost oracle]$ rman target /
Recovery Manager: Release 11.1.0.6.0 - Production on Thu Sep 6 15:47:43 2007
Copyright (c) 1982, 2007, Oracle. All rights reserved.
connected to target database: NING (DBID=1218842970)
Recovery Manager: Release 11.1.0.6.0 - Production on Thu Sep 6 15:47:43 2007
Copyright (c) 1982, 2007, Oracle. All rights reserved.
connected to target database: NING (DBID=1218842970)
