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