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下列关于数据库管理系统维护事务的ACID特性的叙述中,哪一条是正确的?

A、保证事务的原子性是DBMS的事务管理器中并发控制部件的责任
B、保证单个事务的一致性是DBMS的事务管理器中并发控制部件的责任
C、保证单个事务的一致性是DBMS的事务管理器中并发控制部件的责任
D、保证事务的持久性是DBMS的事務管理器中并发控制部件的责任
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正确答案:

C

答案解析:

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Evenifyougetworkdoneandgenerallygetalongwithco-workers,youcouldhavehabitsthatbugyourboss(nottomentionyourofficemates).Whilethesequirksmaynotnecessarilygetyoufired,theycertainlycankeepyoufromclimbingthecorporateladder.We’veuncoveredanumberofhabitsthatbugyourbossandoffertipsonhowtoavoidthem.

AccordingtoLaRhondaEdwards,ahumanresourcesmanagerwiththirteenyearsofHRexperience,tardinessisoneofthebiggestconcernsformanagers.“Ifthenormalworkdaystartsat8o’clock,thentheexpectationisthatyou’reintheofficereadytostartyourday,”sheexplains.Heradvicetothechronicallylate?“Planahead,”sheurges.“Ifyoulive50minutesaway,youdon’tleave50minutesearly.Tagonextratimeandanticipateroadblocks.”Somepeopleevensettheirclocksafewminutesearlytoensurethatthey’reontime.Differentbossespreferdifferentmodesofcommunication.LindseyPollak,aworkplaceexpertandauthorofGettingfromCollegetoCareer,saysifyoutextyourbossandsheprefersin-personmeetings,“eitheryourinformationwon’tgetacrossoryou’llirritate[her].”Fortunately,there’sasimplefix:askyourbosshowandwhentosendupdates.Ifyou’retooshytoaskoutright,thenPollaksuggestsobservinghowtheycommunicatewithyou.“Ifyouhaveabosswhocommunicatesonceadaybyemail,that’stheboss’preferredfrequencyandmethodofcommunication,”explainsPollak.

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