Read-write model

I have an important question about scheduling and the underlying read-write model:

Is it right, that the read-write model dictates, that there are no redundant read or write operations on the same database object per transaction, or better, only one read or write on a specific database object per transaction???

TA1 = r(x) w(y) r(x) w(x) -> the 2nd r(x) would be invalid

Thanks in advance!

Karsten Wutzke Received on Thu Apr 01 2004 - 20:13:10 CEST