Which two statements are true about sequences created in a single instance database? (Choose
two.)
A.
The numbers generated by a sequence can be used only for one table.
B.
DELETE <sequencename> would remove a sequence from the database.
C.
CURRVAL is used to refer to the last sequence number that has been generated.
D.
When the MAXVALUE limit for a sequence is reached, you can increase the MAXVALUE limit by
using the ALTER SEQUENCE statement.
E.
When a database instance shuts down abnormally, the sequence numbers that have been cached
but not used would be available once again when the database instance is restarted.
Explanation:
Gaps in the Sequence
Although sequence generators issue sequential numbers without gaps, this action occurs
independent of a commit or rollback. Therefore, if you roll back a statement containing a sequence,
the number is lost.
Another event that can cause gaps in the sequence is a system crash. If the sequence caches
values in memory, those values are lost if the system crashes. Because sequences are not tied
directly to tables, the same sequence can be used for multiple tables.
However, if you do so, each table can contain gaps in the sequential numbers.Modifying a Sequence
If you reach the MAXVALUE limit for your sequence, no additional values from the sequence are
allocated and you will receive an error indicating that the sequence exceeds the MAXVALUE. To
continue to use the sequence, you can modify it by using the ALTER SEQUENCE statement To
remove a sequence, use the DROP statement:
DROP SEQUENCE dept_deptid_seq;