单项选择题
A. A backup set that is missing one or more backup set pieces
B. A backup that has exceeded the retention criteria and is no longer needed
C. A backup set that does not include archived redo logs
D. A backup set that can not be recovered due to corruption
E. A backup set superceded by a datafile copy
多项选择题 Whatisthepurposeoftherecovercommand？（）
单项选择题 Whatisthepurposeoftheuntilchangeoptionoftherestorecommand？（）
单项选择题 You have control-file autobackups enabled. When starting your database from SQL*Plus， you receive the following error message： SQL> startup ORA-01078： failure in processing system parameters LRM-00109： could not open parameter file ， C：\ORACLE\PRODUCT\11.1.0\DB_1\DATABASE\INITORCL.ORA Using RMAN， how would you respond to this error？（）