During normal operating mode, only the specific changes are written to the online redo logs. However, when the...
tablespace is being backed up, it is possible for the database block to be modified while it is being backed up. This means that part of the block will be "new" and part of the block will be "old" in your backup copy. This is called a split block. To help with this split block issue, Oracle writes the entire block (not just the part that was changed) to the online redo logs when the tablespace is in BACKUP mode.
Dig Deeper on Oracle database backup and recovery
Related Q&A from Brian Peasland
Oracle expert Brian Peasland answers one reader's question about common pitfalls when connecting Oracle to outside programs.continue reading
One reader asks expert Brian Peasland a question about datafile sizes with the Oracle RMAN duplicate 10g command.continue reading
Managing parent table-child table relations in Oracle SQL environments is key to efficient programming.continue reading
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.