Recall the Kung and Robinson optimistic concurrency control algorithm. How can you modify that algorithm to...

Recall the Kung and Robinson optimistic concurrency control algorithm. How can you modify that algorithm to ensure that every transaction eventually completes?

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Optimistic iconcurrency icontrol i(OCC) iis ia iconcurrency icontrol imethod iapplied ito itransactional isystems isuch ias irelational idatabase imanagement isystems(dbms) iand isoftware itransactional imemory. iOCC iassumes ithat imultiple itransactions ican ifrequently icomplete iwithout iinterfering ieach iother. iWhile irunning, itransactions iuse ithe idata iresources iwithout iacquiring ilocks ion ithose iresources. iBefore icommitting, ieach itransaction iverifies ithat ino iother itransaction ihas imodified ithat idata iit ihas iread. iIf ithe icheck ireveals iconflicting imodifications, ithe icommitting itransaction irolls iback iand ican ibe irestarted.

Optimistic iconcurrency icontrol itransactions iinvolve ibelow iphases:

Begin: iRecord ia itimestamp imarking ithe itransaction's ibeginning.
Modify: iRead idatabase ivalues, iand itentatively iwrite ichanges.
Validate: iCheck iwhether iother itransactions ihave imodified idata ithat ithis itransaction ihas iused i(read ior iwritten). iThis iincludes itransactions ithat icompleted iafter ithe itransaction's istart itime, iand ioptionally, itransactions ithat iare istill iactive iat iits ivalidation itime.
Commit/Rollback: iIf ithere iare ino iconflict, imake iall ichanges itake ieffect. iIf ithere iis ia iconflict, iresolve iit, itypically iby iaborting ithe itransaction, ialthough iother iresolution ischemes iare ipossible. iCare imust ibe itaken ito iavoid ia i(TOCTTOU) itime-of-check ito itime-of-use i ibug, iparticularly iif ithis iphase iand ithe iprevious ione iare inot iperformed ias ia isingle iatomic ioperation.

venereology answered 2 days ago

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Recall the Kung and Robinson optimistic concurrency control algorithm. How can you modify that algorithm to...

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