Social Media Marketing and Your Targeted AudienceMoshiur Monty
Social Media Marketing and Your Targeted Audience Nature. Social media has emerged as a very powerful online marketing force in today's internet driven world. Don't you think social media marketing is one of the essential keys to your business success?
Moshiur Monty.
Digital Marketing Trainer Bangladesh.
http://moshiurmonty.com/
14. Using Image Copies
for Recovery
• 如果对数据库作了镜像备份(实际上是将数据库文件拷贝至另一个位置, 文件名
会发生变化), 那么应该使用该镜像对数据库进行还原, 这会大大地提高
还原的速度. 使用下面的命令执行镜像备份:
backup as copy database;
backup as copy datafile 4 format '/u02/df_copies/users.dbf';
使用如下RMAN脚本将数据文件切换到镜像:
run {sql 'alter database datafile 4 offline';
set newname for datafile 4 to '/u02/df_copies/users.dbf';
switch datafile 4;
recover datafile 4;
sql 'alter database datafile 4 online';}
使用以下命令将整个数据库还原至某个镜像:
switch database to copy;
镜像备份的另一个用法是, 首先创建一个镜像然后定时对该镜像应
用增量备份, 这样可以保证该镜像处在较新的状态, 从而大大缩小数
据库修复的时间, 使用下面的脚本:
run {backup incremental level 1 for recover of copy with tag 'inc_copy' database;
recover copy of database with tag 'inc_copy' ;}