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5.	What are channels?
	RMAN process uses channel to communicate with I/O devices. You can control the type of I/O device, parallelism, number of files and size of files by allocating channels.
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6.	What is the difference between incremental backup and differential backup?
	Both, incremental and differential backup files that have been modified or created after the previous backup. However, attributes are reset after the incremental backup but not after the differential backup.
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7.	Can you take online backup of a control file?
	Yes, by using the following statement: Alter database backup controlfile to '<location>' or trace.
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8.	Can you backup the online redo log files?
	We cannot backup the online redo logs; however online redo logs are protected by multiplexing and optionally by archiving.
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