You have a production instance running on your server. UNDO_RETENTION is not long enough to satisfy read-consistency requirements. How do you change the UNDO_RETENTION value?()<img src="https://img.ppkao.com/2018-08/wangjing/201808011534471899.jpg" /><p> You have a production instance running on your server. UNDO_RETENTION is not long enough to satisfy read-consistency requirements. How do you change the UNDO_RETENTION value?()<img src="https://img.ppkao.com/2018-08/wangjing/201808011534471899.jpg" /></p>
A、A.A
B、B.B
C、C.C
D、D.D