163. You are managing a database for which incremental backups can be

very time consuming. In order to perform. optimized incremental backu

ps you enable the block change tracking feature. How would you instru

ct RMAN to use the block change tracking feature when performing incr

emental backups?

A. You need to mention it with every BACKUP command.

B. The block change tracking feature is used automatically by RMAN.

C. You need to configure it using the CONFIGURE command.

D. You need to set the necessary initialization parameters to direct

RMAN to use the feature.

Answer: B

SQL> ALTER DATABASE ENABLE BLOCK CHANGE TRACKING USING FILE

'/mydir/rman_change_track.f' REUSE;

打开了更改跟踪数据，这是oracle 会把数据更改自动写入规定的文件。

Rman 也会自动应用

CTWR :Oracle 引入了一个新的后台进程，CTWR，其全称为Change Tracking

Writer，用于记录变化的块并将变化写入相应的日志文件中。

另RVWR: 在启动Flashback Database 之后，它定期将已发生变化的块写入

闪回日志的日志文件中。这些日志不是由传统的Log Writer (LGWR) 过程写入，

而是由一种称作Recovery Writer (RVWR)的新过程写入

$ps –ef |grep rvwr|grep –v grep

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