A.打開(kāi)數(shù)據(jù)庫(kù)時(shí) B.裝載數(shù)據(jù)庫(kù)時(shí) C.實(shí)例啟動(dòng)時(shí) D.每個(gè)階段都要讀
A.NORMAL B.ABORT C.IMMEDIATE D.NONE
A.OPEN,NOMOUNT,MOUNT B.NOMOUNT,MOUNT,OPEN C.NOMOUNT,OPEN,MOUNT D.MOUNT,OPEN,NOMOUNT