Why insert does not cancel?

I don't really know why this is the case!

If I insert a row in table T, and then I roll it back, all I have to do is mark the space that this line in the block of data as 'empty', as it was before. Why should a cancellation for this?

Thamks

OracleGuy777 wrote:

But what is seriously confused me. The redo log buffer is in memory, and I thought that when the system crashes, all the RAM associated to the instance is lost. So I'm expecting the newspaper guy to redo anything contain when the instance starts again. But Tom seems to say the opposite. It's very confusing to me.

It will remain confusing because you are missing a piece of the puzzle and it is write the prior logging. Oracle would write any entry would keep you in cache buffers for any segment, first place in the redo buffer. There are many events that trigger LGWR to write in the buffer to the file and a time-out is 3 seconds. It would constantly push data in redo logs fles, which would serve to make the roll forward.
If the data is not saved in the redo buffer, oracle does not mark it invalid in the buffer cache as well.
HTH
Aman...

Tags: Database

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