单项选择题

The（）schemeinadatabasesystemisresponsibleforthedetectionoffailuresandfortherestorationofthedatabasetoastatethatexistedbeforetheoccurrenceofthefailure.

A.query
B.test
C.check
D.recovery

<上一题 目录 下一题>
热门 试题

单项选择题
（）statementcanperformacalculationandstoretheresultinavariablesothatitcanbeusedlater.

A.Assignment
B.Control
C.I/O
D.Declaration
单项选择题
Dataitemsareaddedordeletedfromthelistonlyatthetopofthe（）.

A.queue
B.stack
C.tree
D.linearlist
相关试题