问题:
Two database users, Jack and Bill, are accessing the Certkiller STAFF table of the Certkiller DB database. When Jack modifies a value in the table, the new value is invisible to Bill.
Which is the modified value invisible to Bill?()
A . The modified data are not available on disk.
B . The modified data have been flushed out from memory.
C . The modified rows of the Certkiller STAFF table have been locked.
D . Jack has not committed the changes after modifying the value.
E . Both users are accessing the database from two different machines.
Two database users, Jack and Bill, are accessing the Certkiller STAFF table of the Certkiller DB database. When Jack modifies a value in the table, the new value is invisible to Bill.
Which is the modified value invisible to Bill?()
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