[单选]
You executed the following command in Recovery Manager （RMAN）：
RMAN> RESTORE CONTROLFILE；
Which operation must you perform before this command is executed？（）

A . back up the control file to trace
B . bring database to the MOUNT state
C . open a connection to the RMAN recovery catalog， which contains the RMAN metadata for the target database
D . set the database ID （DBID）， but only if the DB_NAME parameter associated with the target database is unique in the recovery catalog

一份好的商业计划应符合哪些要求？体增热 Which statements are true regarding table compression? （）(Choose all that apply.) It saves disk space and reduces memory usage.。 It saves disk space but has no effect on memory usage.。 It incurs extra CPU overhead during DML as well as direct loading operations.。 It incurs extra CPU overhead during DML but not direct loading operations.。 It requires uncompress operation during I/O.。 An end user is deploying Blade servers to replace obsolete rack mounted servers. In addition to AIX Web server and database workloads, they also have Windows workloads. Which Blade is designed for Windows workloads?（） HS22。 JS43。 QS21。 PS701。以下（）是属于直流电动机的定子部分。换向器。电枢绕组。励磁绕组。风扇。

You executed the following command in Recovery Manager （RMAN）：
RMAN> RESTORE CONTROLFILE；
Which operation must you perform before this command is executed？（）

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[单选] You executed the following command in Recovery Manager （RMAN）： RMAN> RESTORE CONTROLFILE； Which operation must you perform before this command is executed？（）

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[单选]
You executed the following command in Recovery Manager （RMAN）：
RMAN> RESTORE CONTROLFILE；
Which operation must you perform before this command is executed？（）