Q57.
Which two statements are true about sequences created in a single instance database? (Choose two.)
A. CURRVAL is used to refer to the last sequence number that has been generated.
B. DELETE <sequencename> would remove a sequence from the database.
C. The numbers generated by a sequence can be used only for one table.
D. When the MAXVALUE limit for the sequence is reached, you can increase the MAXVALUE limit by using the ALTER SEQUENCE statement.
A. CURRVAL is used to refer to the last sequence number that has been generated.
B. DELETE <sequencename> would remove a sequence from the database.
C. The numbers generated by a sequence can be used only for one table.
D. When the MAXVALUE limit for the 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.
Correct Answer: AD
Explanation/Reference:
References:
http://docs.oracle.com/cd/E11882_01/server.112/e41084/statements_2012.htm#SQLRF00817
https://docs.oracle.com/cd/A84870_01/doc/server.816/a76989/ch26.htm