Demerits of alter tablespace begin backup on 10.2.0.4

Hi,
What are the demerits of putting a tablespace in hot backup mode. I know that it generates additional data in redo logs. But, does DBWR and LGWR performance is also impacted? Does database writer throughput reduce leading to free buffer waits? Are these wait events common - free buffer waits and log file sync waits when tablespace is in hot backup mode? Please clarify.
Thanks,
Madhav

Those wait events would be symptoms of the increased I/O and higher I/O Wait/Response times.
There is obviously more Redo, so LGWR has more to write.
DBWR performance is probably being constrained by the I/O.
Note that it isn't just the ALTER TABLESPACE BEGIN BACKUP that is the cause. It is also the backup itself -- whether you are using cp or cpio or tar or any other method to copy datafiles to disk or to tape or to a remote server / tape library. The backup is reading from the same datafiles that DBWR is writing to and, if it is writing the backup to local disks, it is also introducing additional write I/O.

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