多项选择题
A. It must be used because all RMAN-related backup and recovery metadata information is contained in it.
B. It provides a convenient， optional， repository of backup- and recovery-related metadata.
C. It provides the ability to store RMAN scripts for global use by any database that has access to the repository.
D. It provides a means of storing all RMAN backup sets physically in an Oracle database server.
E. It provides the ability to store backup records for more than a year.
多项选择题 In Oracle 11g, which recommendations does the SQL Access Advisor generate? （）(Choose all that apply.)
单项选择题 You issue the following command： RMAN>CONFIGURE BACKUP OPTIMIZATION ON； What is the result of this command on your backups？（）
单项选择题 Which tuning tool recommends how to optimize materialized views so that these views can take advantage of the general query rewrite feature?（）