What advantage would you get if you increase the length of time during which the undo information
would be stored in the database?
A.
roll back of large transactions
B.
roll forward to redo a transaction
C.
data concurrency for large updates
D.
read consistency for long-running transactions
The longer the undo information is stored, the transaction would have better continuation of data (consistency)
Oracle Database maintains data consistency in a multiuser environment by using a multiversion consistency model and various types of locks and transactions. The following topics are discussed in this section:
Wonderful story, reckoned we could combine a couple of unrelated data, nonetheless really really worth taking a search, whoa did one study about Mid East has got more problerms also.