This is an undying myth. "datafiles are not updated when the database is in Hot Backup mode" .... "all updates are in the archivelogs and they are applied to the datafiles when the database is taken out of the Hot Backup mode" ... and so on ..
Here's an article by Jeremiah Wilton which has been refuting this myth for a very long time :
ORACLE TABLESPACE HOT BACKUP MODE REVISITED
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Here's an article by Jeremiah Wilton which has been refuting this myth for a very long time :
ORACLE TABLESPACE HOT BACKUP MODE REVISITED
.
.
.
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