An uncommitted TRUNCATE TABLE command does not block online backup. We should verify that the online and backed up databases are both in a consistent state. At a minimum, we should test the following:
o uncommitted truncate table followed by online backup and then access the backup copy and access the table. should see the old data.
o uncommitred truncate table, followed by online backup that keeps logs,
then commit the truncate, and then access the table in the backup.
For more information, please see this email thread: http://old.nabble.com/truncating-a-table-vs-online-backup-to31524933.html#a31524933