In user-managed backup and recover procedures， how are data files backed up？（）<br>A:Using SQL commands.<br>B:Using SQL*Plus commands.<br>C:Using operating system commands.<br>D:Using Recover Manager commands.

In user-managed backup and recover procedures， how are data files backed up？（）
A:Using SQL commands.
B:Using SQL*Plus commands.
C:Using operating system commands.
D:Using Recover Manager commands.

出自：Oracle认证

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