单项选择题

Given：11.Stringtest="Thisisatest"；12.String[]tokens=test.split（"s"）；13.System.out.println（tokens.length）；Whatistheresult？（）

A.Anexceptionisthrownatruntime.
B.1
C.4
D.Compilationfails.
E.0
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单项选择题
YouhaveforgottenthenameofbinaryPL／SQLlibrarysavedtotheoperatingsystem.ThisfilecontainsthePL／SQLconstrictsyoucreatedfortheinventoryreport.Forwhichfileextensionshouldyoureach?（）
A..SQL
B..PLL
C..PLD
D..PRT
单项选择题
YouissuedthefollowingRMANcommand：RMAN>CONFIGURECONTROLFILEAUTOBACKUPON；WhatisNOTanimpactofusingtheabovecommand？（）
A.WhenasuccessfulbackupisrecordedintheRMANrepository，thenabackupofthecurrentcontrolfileisperformed.
B.Whenastructuralchangeismadetothedatabase，thenabackupofthecurrentcontrolfileisperformed.
C.WhenasuccessfulbackupisperformedintheRMANrepository，thenabackupofthespfileisperformed.
D.Whenastructuralchangeismadetothedatabase，thenabackupofthealertlogfilewillbeperformed.
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