A.RESTORE DATABASE UNTIL B.RECOVER DATABASE UNTIL C.RECOVER DATA UNTIL D.RESTORE DATA UNTIL
A.alter B.create C.drop D.commit
A.數(shù)據(jù)結(jié)構(gòu)化 B.數(shù)據(jù)由DBMS統(tǒng)一管理和控制 C.數(shù)據(jù)冗余度大 D.數(shù)據(jù)獨立性高