单项选择题
A. Failed disks are taken offline immediately but are not dropped.
B. Disk data is never lost.
C. By default, the failed disk is not dropped from the disk group ever, protecting you from loss of that disk.
D. The failed disk is automatically reformatted and then resynchronized to speed up the recovery process.
E. Hot spare disks are automatically configured and added to the disk group.
单项选择题 Youhavecreatedascriptintherecoverycatalogcalledbackup_database.Whichofthefollowingcommandswouldsuccessfullyexecutethatscript？（）
多项选择题 Ifyoubackupadatabasewithoutconnectingtotherecoverycatalog，whichoperationswillcausetherecoverycatalogtobeupdated？（）
单项选择题 View the Exhibit for some of the current parameter settings. A user logs in to the HR schema and issues the following commands: SQL> CREATE TABLE emp (empno NUMBER(3), ename VARCHAR2(20), sal NUMBER(8,2)); SQL> INSERT INTO emp(empno,ename) VALUES(1,JAMES); At this moment, a second user also logs in to the HR schema and issues the following command: SQL> ALTER TABLE emp MODIFY sal NUMBER(10,2); What happens in the above scenario?（）