单项选择题
A.No size is specified
B.The buffer pool size
C.The page size for the table space
D.The extent size for the table space
单项选择题 If a unique constraint is defined on column COL1 of table TAB1, what are the characteristics of COL1?（）
单项选择题 A DBA has been asked to create a table which will contain a substantial amount of detailed sales information for each calendar month and maintain it to contain only the last 12 months. Which of the following methods will facilitate the online removal of the oldest month’s data?（）
单项选择题 Which of the following is true of an index used to support a UNIQUE constraint?（）