对以下的叙述正确的是 int x=1; do { x= -1*x; } while(!x) A. 是死循环 B. 循环执行一次 C. 循环执行二次 D. 有语法错误
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举一反三
【多选题】You plan to execute the following command to perform a Flashback Database operation in your database: SQL> FLASHBACK DATABASE TO TIMESTAMP (SYSDATE -5/24); Which two statements are true about this...
A.
The database must have multiplexed redo log files
B.
The database must be in the MOUNT state to execute the command
C.
The database must be in the NOMOUNT state to execute the command
D.
The database must be opened in RESTRICTED mode before this operation
E.
The database must be opened with the RESETLOGS option after the flashback operation
【单选题】If you lost your entire database,including the database spfile,control files,online redo logs,and database datafiles,what kind of recovery would be required with RMAN?()
【多选题】You are managing an Oracle Database 11g database. You configured the database to run in ARCHIVELOGmode. Which two statements are true in this scenario()
A.
You must shut down the database instance to perform the backups.
B.
You must configure the Flash Recovery Area (FRA) for the database.
C.
You can perform complete database backups without closing the database.
D.
All the previous closed database backups including control files become invalid after you configure thedatabase to ARCHIVELOG mode.