Simple issue of UPDATE
Hello Experts,
I'm very asked a very simple and basic information on UPDATE. When an update statement is executed. As far as I know, the expected data is read into memory block, then edit its data in memory and a block of cancellation is also created for restoration. I'm just up to this point?
My question is when this block of data read from a hard disk into memory. What is its header changed block? (As the list of self-dealing in the block header data)
Concerning
Charlie
Yes the session which make changes (i.e. DML opreration) put the information of table locking ITL (which is in the header of the block), so that the other session try to change line information by checking ITL and wait for its completion.
HTH
Thank you
Tags: Database
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