Which two statements are true about transactions in Oracle Database 12c?
A. Multiple transactions can use the same undo segment.
B. A transaction is assigned an undo segment when it is started.
C. Multiple transactions cannot share the same extent in an undo tablespace.
D. If all the segments in an undo tablespace are used, transactions use system undo segments to store undo data.
Answer:B
Which two statements are true about transactions in Oracle Database 12c?
A. Multiple transactions can use the same undo segment. B. A transaction is assigned an undo segment when it is started. C. Multiple transactions cannot share the same extent in an undo tablespace. D. If all the segments in an undo tablespace are used, transactions use system undo segments to store undo data.