Atransactionisanaction,oraseriesofactions,carriedoutbyasingleuseror(请作答此空),thataccessesorchangesthecontentsofthedatabase.Atransactionshouldpossessthefourbasicorso-calledACIDproperties:Atomicity.The“allornothing”property.Atransactionisan()unitthatiseitherperformedinitsentiretyorisnotperformedatall.Consistency.Atransactionmusttransformthedatabasefromoneconsistentstatetoanotherconsistentstate.Isolation.Transactionsexecuteindependentlyofoneanother.Inotherwords,thepartialeffectsof()transactionsshouldnotbevisibletoothertransactions.Durability.Theeffectsofasuccessfullycompleted(committed)transactionarepermanentlyrecordedinthedatabaseandmustnotbelostbecauseofasubsequentfailure.Thefourpropertiesabove,only()propertyistheresponsibilityoftheconcurrencycontrolsubsystemtoensure.Itistheresponsibilityofboththe()andtheapplicationdeveloperstoensureconsistency.ToguaranteetheAtomicityandDurabilitypropertiesafterafailure,alogfileisneeded.
A.application developer B.all users C.application program D.DBMS正确答案C
