单选题

You are working on a 24X7 database. You want to design a backup strategy for your database that uses user managed backups. You want to be able to perform all backups while the database remains online. Which statement about performing user-managed backups in a 24x7 environment is true?（）

发布日期：2020-04-10

You must have change tracking enabled in your database

Your database must be running in NOARCHIVELOG mode

To back up a tablespace, it must be in backup mode

To back up a tablespace, it must first be taken offline

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