Originally posted by Sonia
adewri,

My question is what is ther reason behind freezig the datafile header ? why can't it be done without freezing the datafile header ?

well the datafile headers contains the SCN that is why oracle freezes them..when recovery begins it is compared with the SCN in the controlfile that is how oracle will know where to start recovery for that tablespace..

not abt why a hot backup is required.

regards
sonia
was this your question? or am i missin somethin ?