Have a Q about back up

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HelllOOOOOo All ;) :

I've a qustion about back up , lets assume that I've a Data Base , contains more than 70 users , and I made a back up for example in 2:00 am, after that 20 users(randomly) made some changes ,then in 3:00 am for example there was a bad sector in Hard Disk , so if I want to reurn the changes that have made for 20 users , how can I return them back ? is thier any strategy?

Thanks in Advance, I appreciate any reply :)

Posted 22-Jul-10 20:23pm

Strategic_Thinker

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Abhinav S · Answer 1 · 2010-07-22T20:39:00

Cold database backup

During a cold backup, the database is closed or locked and not available to users. The datafiles do not change during the backup process so the database is in a consistent state when it is returned to normal operation.

Hot database backup

Some database management systems offer a means to generate a backup image of the database while it is online and usable ("hot"). This usually includes an inconsistent image of the data files plus a log of changes made while the procedure is running. Upon a restore, the changes in the log files are reapplied to bring the database in sync.

I guess you need to read more about 'Hot' data backups.