Chapter 16 : Concurrency Control

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Chopier 00 : Cowwrewy Ovdrol ‎Gystew Ovwepe Ot Cd.‏ لت ‎Steven nk wo Stern, ODS‏ © ‎oar‏ ا اك ‎ 

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+ Ohnper 06: Oounrreay Occercl Lock-Bosed Protocols ‏اس( هکس‎ Onthotce-Based Protects Outipte Grosutarty Outiversion Gchewes اك “| ‏جسم 0) ودوك () لحد نوصد‎ Coursey tt Tedex Grructures Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 wo ©Sbervehnts, Cork ced Cnakershe 

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نیت سا + ۱ aovess too dota eo © ete tews can be locked to tur wards | 1 ‏ماه‎ 00 ods, Dot tooo con be bok read ae well tortion. Glock t& requested vein: bob X keirto. ©. shored (G) wards. Data te ox vay be read. Gotoh rexnesied usin: bok ® keiructes. Bo bock reqests ore wade ty ‏جاسكم" سجوددمب امدمصسرصج سحمون‎ cos proceed ‏رای‎ Per request is yrcaied. Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 wo ©Sbervehnts, Cork ced Cnakershe 

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+ ‏اس 6 لس‎ Protucks (Cou) مرا ۱ 5 x S | true | false X | false | false ۲ ‏ما مومس ما و لصوم با رو مش‎ the requested lock is cocwpatbe: woth locks dready held oo the tear by vier trocar © ‏انیت بو‎ oF ‏و‎ von hold shored locke vo oo tec, © bulP cop trocsuntiva holds on excheive vo he few ov viker trocsurios wo ok cay back oo the ites. BR ateck cased be yrovied, the requestiay ircczantiog food te uct tll opie locks belt by olser trassurtiows have b vet ‏.ل‎ "(۳ tots te th ‏اي‎ Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 we ©Sbervehnts, Cork ced Cnakershe 

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+ ‏اس 6 لس‎ Protucks (Cou) ۴ ‏مرو ما دلوم‎ bachiey: 1 bok )0( read (0); ‏سید‎ (PB): boh-8(); read )0(: wcdook (DB). ‏بواج‎ )0+)©( 19 Lockey os ubove is oot ‏صا لمجاو ةنانك‎ uaruiee sertdtzabtiy — iP Pond @ yet updated ‏ام سا سل‎ oP (ocd O, the displved sue would be wrong. ۲ ۵ ‏ام پا‎ 0 set oP niles Polowed by ofl trowsariocs while requestor ord reteasten locks. Locktog protocols restrict the set oP possible schedules. Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 

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+ PP db oP Look ‏با‎ Coxeter the port schedule lock-S(A) read(A) lock-S(B) © Oetker Tor Ty con che prowess — exer br 8((P) cower Nyt wrt Por De reese ‏جنا‎ beck oa @, white execurnt bok X(B) oases To wt ‏ما سا و( بوخ‎ ©. و ‎poe of DP, or Py. oust be rolled back‏ الم ‎Do kode o‏ و ‎vad tts locks released.‏ ‎Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 wo ©Sbervehnts, Cork ced Cnakershe 

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+ @ Pb oP book-Bwed Proivvols (Ova.) 18 Vhe poteutdl Por deadock exists to ‏اوم‎ ocho protocols. Deudechs ore o ‏تاره وی‎ او بلط عا موی ای وج ۶ ‎is dbp possible‏ و68 ۲ ‎(Por excnopte:‏ © O trocsuntivs way be waite Por oo Xoo oo oc tec, whie o secqueuse oP vier trocsanizes request oad are qroded oa Ook va the secre tec. © Dhe save treeourivs i repediedy rolled buck due ty deadoohs. © Cowrrewy ordi! woeger con be desigoed ty preved storveoticn. Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 wor ©Sbervehnts, Cork ced Cnakershe 

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لصاح <]) مارا نون ‎The‏ + Phe ts 9 proton whick eusures ‏ارو یبای‎ © Phe 0: Growiay Prose © trecsuniva way obtaia lochs Bl Dhe ‏.تهات امد اميد یج اس‎ con be proved tho ‏مت بط‎ mt ber ‏لبود‎ ia he order of thet bok potas (he. the potst where ‏مس و‎ canted te Fe loch). Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 wo ©Sbervehnts, Cork ced Cnakershe 

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+ Ve Two-Phase bockiag Proovol (Ova) ۲ ‏مت و ناسا ام‎ eosure Preedow Prow deadlocks: هس بط له ۳ با سوم ی ام تالا مین ۲ د جما ضحد موصو ب مونلا" ‎beckon.‏ سسا ميو تجوت ‎oxded‏ ۳ و سبط با و کوب BO Rkprow two~phose boohiey is even stricter! here afllochs ore held a ‏ول موم‎ Te this protocol iracsucioas coc be sertdtzed to the order fet whirl they oval. Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 wo ©Sbervehnts, Cork ced Cnakershe 

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+ Ve Tu02-Pkwse bockiay Prowvol (Ova) © here con be coin setdizable schedules thot coca be obtoced P two-phase locker te used, BE Abowever, nike coeur of extra tPorwatin (es. ‏ص عه اد جلمد‎ cht), ‏ارم‎ beh & weeded ‏و تراسا مت نی و‎ he Pub see Cres 3 roms 7, tral does ot Polo two-phase lookin, we oo Pre ‏تور‎ hot wes twe-phuse lachiog, ued ‏ساره و‎ Por, aed frat wet vu bot pevniksab, Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 16.00 ©Sbervehnts, Cork ced Cnakershe 

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‎Cowersow‏ وم ‏مسجت جات مارا موی بت = ‎© con emir obo ‏مان‎ ‎© ‏ام الاخاطصط د شوم صن‎ © more able to a boleX (urate) ‎= Grooad Phe: ‏اه اه من ۰ ‏تساه ما مت © ‎© corer ab X walk (dour) ‎ie protec ‏مج‎ sertdtzobiliy. But stl retes oo the ‏بو ما موم‎ the various: lookiey icstruntiocs. ‎ ‎4 ‎Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 ‏سا0 لح 0 لا سواه 1 موه‎ 

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انا ان مراب مق + ۱ ۵ ‏جامد جيب لوحت 1 ما‎ ketruton, wihout expt ‏مایا‎ ‎ook, ‎۳ yeas ‏الس ا ا‎ BD bee obck oo D Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 ‏سا0 لح 0 لا سواه 1 هوه‎ 

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+ Dias Boqasion oF backs (od) 19 wrte(D) © provessed os: PD bea bokX oa O tea werte(D) vbr boda P cevessery uit vail oe ober trace. kar xy book oa O, PD as a bk os D fea ware lock oa D ۰ X ‏سر‎ ‎۱ ‎wwrte(D) ‎eed; ‎Bl Ollocks oe rebwerd Per crm or hort Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 16.00 ©Sbervehnts, Cork ced Cnakershe 

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رت اصورا اه وعتهزء عم عام ]|41 ار و و وب اما و ‎ook canner‏ 1 ‎cert beh seater erent‏ یسیو 9 Dhe book ‏اه وا اس مد‎ request by sear a book or =p (oro epee chin he reeearion ty rol back, rouse oP a decrdoch) اوه هط او لت ات و پم ‎Db‏ 8 ‎a lols fable to record gracied‏ ای مود و وم ما با 0 ‎locks ood prodey requests‏ BD he tock tobe & wndly kopleweoied os oo kewewory hook toble todexed vo he ‏اما با ما بل با اه سوم‎ Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 10.00 ©Sbervehnts, Cork ced Cnakershe 

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۱ ‏یلصم سم ان‎ 0 BE ‏را‎ table ube records tee type oP looks ‏اه‎ ‎or requested Bh Dew request ty udded ty he word oP he queue oP rexnent> Por he dats teen, ood ‏وخ لهج‎ ‏مامتا اج ی این زمرت با‎ ۱ debted, cod hier requests are cheched tp see P they cos ow be grcnted BP rex@urtva boris, oll wrattery or graced ‏تاسسوم‎ oP ‏ای سس مات تس‎ ۱ held by eack expert, ip kopkwet they Peed Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 ‏سا0 لح 0 لا سواه 1 هوه‎ 

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او + ۳ ‏ام او ما‎ et © ‏رس یولع‎ of} oF oll dota tooo. © AP > of how ey ‏امسوم‎ wevevekn bok duel dwt woveny beta essary © Aeoples that he set O cry wow be viewed ‏جم‎ a drevted anicke graph, caked oe chet cp BL ‏اما اون سوه بط‎ oP ‏رو‎ proto. Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 06.00 ©Sbervehnts, Cork ced Cnakershe 

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۲ ‏اس و اما ماه رن‎ Bl Dhe Prot bok by Pc be oa ow ch . Cabsecnenty, 0 chia Q rf locked by Pod B ke pared of Gis mreciy locked ‏و‎ 17 © Oot tews woy be unioched of oop eve. Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 ‏سا0 لح 0 لا سواه 1 جووه‎ 

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+ @rapk-Bwed Procol (Orc) Bb. tee prod ewswres oodPint seridizoblliy os well os Preedow Prow deudock. BE Oddeckie, ay poor rater fa he treetockin protocol thor he tpl ‏ام مایا‎ © shorter writes fkver, oad Rreae kt ey ‏ی ماما ره اس اس‎ required 0 ‏روارک جر ی بت سر اس‎ or cusvute Breede ١ ‏المصصت «سلحماها صا لج(‎ depeudeures to eerure recovery ۶ ‏و رون مه‎ to look dota tiews that hey do oot ‏یت‎ ‏رهم ای امه امه ماما لو‎ Reve ۱9 ‏بصصعصجمم ما و‎ ۱ Gchedkies wt poosble under two-phese backiny ore possible wander tree proc, ood vice versa. Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 ‏سا0 لح 0 لا سواه 1 هوه‎ 

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‘Picpesiawp(Dosed (Procol Bl Gk erection & bed 0 keeoknop wheal euler he syste. ‏ومتسخصمة لامج خا"‎ 1١ kee hoes TO(), ace innearton 7۱ ۰ ‏موی له‎ NE(T) suck trot DO(P) <PE(T). 0h peer seers seeruneg mae re oink Ben be recep eee a serndiublay ‏بساحن‎ ۳ ‏اوه وچ و و و‎ behav, be pried cerca Bor park ‏مه مدا‎ inkes! ۶ ‏خر رس مها بط تا( )سین‎ oxy ‏نكا مسمس‎ exerted wore(@) © (Ci) he kent tex-oknoy oP oxy trexeuntia frat exerted rerd(C2) ۳ Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 06.00 ©Sbervehnts, Cork ced Cnakershe 

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+ Vrowskrop-Dosed Prowools (Ovw.) Bh Dhe tkoeskop onderkny procond exsures thot oxy cocci, ‏صمي حب لمحم‎ pyres ‏او سم ام و بو‎ Bl Capper o ixxewion 1 eer area) ARDEP) < O-cwestanp(Q), hea 7 weeds to read ouch oP © thot wos dred overumtien. B Aewe, he read ‏لمم رت ام‎ 17١ ‏عامجا لجا جا‎ AE PC(P)= O-Roesknop(Q), hea the read operctioa te exerted, orn (R- ikoeeknop(Q) et to be conten of R-terestry(@) ont DEP). Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 ‏سا0 لح 0 لا سواه 1 موم‎ 

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+ ‘Pramekrop-(Daset (Proeods (od) ۱ ‏مس با یت‎ 7) ioouee wrte(@). بمصطسم ط ‎1١‏ ادا © خم ساس جد ‎Racesknop(Q), fea‏ > (00) 10089 1۳ ۱ ‎th thot cher wml ever‏ تسه مرو سا اجه ‎wre weeded previa),‏ ام با بجاصصا ما لمج له مه رت ‎ewe,‏ 8 ‎choot‏ جه جمد جا مجه ‎thea te‏ | ‎inhe of Q.‏ جامجا لام جا ‎1١‏ اج لح مه رت ‎ewe,‏ 8 مسد ها (© )رمعم 0 ‎operaiog te exerted, od‏ رت ۲ ,شمان )۵ Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 16.00 ©Sbervehnts, Cork ced Cnakershe 

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+ Cbathapls (Dew bP be (Bromoct © port schedule Por severd deta ews ‏ای و‎ uh: ikvestawps 0, ©, ©, 0, © سا0 لح 0 لا سواه 1 موم ©00© , 09 جنا ‎rare,‏ "© - بسي مسي ساي 

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+ Correvicess oP Mevesiucmp-Orderiey Crotscel 0 ‏تطلس صصص دا‎ proiool quersoiees serttzobiiiy store oll he orcs ia he prevedeure yrupk ure oF the Porc? wits saree ‏اس‎ Dhue, there ull be odes in he prevedeue yropk BP kvesknrp ‏مه ام‎ Preedow Prow deudock ‏.كسد و متا مت و‎ But the ‏تا موی سا من روت لاه‎ ced way oot eve be revovercble, Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 ‏سا0 لح 0 لا سواه 1 موم‎ 

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را را + © Croblew wit ‏اس روم‎ © Guppose TP cboris, bu Thos read a dota ew writes by TP ۶ ۳ 1 ‏سه‎ ober) PDP hod bees olowed tp coset corer, he schedule ‏ع‎ wet reo ۰ ee ei efor ei © This cod lead to cascada rolback --- thot is, a choc of rolbacks: ۰ مسبت ۲ ۱ suck thot is writes ore oll perPorwed of the ead oF ts processiny © @luories oP o tronsuntios Por ‏مات و ود‎ op ‏وه رو متس‎ hie o trocerontiog ts betes usrities © 0 treceuntivn tot uborts is restated wih ‏مت وه و‎ © Gokiica ©: Licted Porn of leche uvat Por dota te be ooercvited bePore recor © Goktod 9: Ose cow depeudeuwies ty usw recovery Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 ‏سا0 لح 0 لا سواه 1 موم‎ 

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+ Vows’ Drie Rie © QodPed versiva of the teestecop-orderteny prized ta which obsvlete uate ‏مومت اه ی لصو با بو اه‎ ۵ ‏ما‎ 1 otewps burt hts te Q, FDEP) < O-tereokaep(Q), hea Ti ‏وا واه‎ Warts on obookte vor of {GQ}. © Roker foc roti bark Pc he tkoeskney orderien proton wud hve chew, this {wrt} operation von be kore. ۲ Otherwise this protocol ie the ‏سود‎ or ‏بط مه‎ 1 Dhoune! rte Que ‏سم لورت واه‎ © ‏اوه وه نم موه رای مور وه وا‎ Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 ‏سا0 لح 0 لا سواه 1 موم‎ 

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+ Odkktoe-Orewd Protoel B Gxenadics of trexeuntion Dis door to three proses. 0. Red cad period phee: Prosustoa T writes oly to tewwporary lod variables: ©. Orders phase: Trocuntios TP perPorns a volrdaticg test" to detente Pood votobles ca be writes uvthout vicki, ‏.بهاحامد ام جد‎ 9. Orte prose: 1۳ 1 ۰ ‏ول سا ,الا‎ are upphed to the database; vherwise, T, te roled back. “he tree phoses of ‏شمسا بلج رسمه‎ cot be ‏فا راما‎ puck ‏اما مب امه وتو‎ the three phases is thot order. © seve Por skopiniy thot the voidaiog cod wrt phase pour toyeher, iowicdly ocd serial * Le, caly ove trowsuntiva exevuies vokdaicad warts of a fie. © ‏وت اوه هجوت تون جهن لایس تا‎ trocsuniivg executes Puy ic the ‏ما تخس سب جيب لس له فا سا‎ Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 ‏سا0 لح 0 لا سواه 1 موم‎ 

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+ Orkkior-Bwed Protval (Ov.) ۱ ‏و سس ی‎ keeoknops © ‏له 7 مات بط : ( )نم8‎ execution ‏سم ملس ات ۱ ایب با ناسون و‎ © Prish(D) 2 he teoe when P, Protshed te ware phrase © Gertazobliy order deterwiced by tkoestrep ‏مرف‎ ot valde toe, to free AEE. © Dhue DET) & que he che of Oukkaoa(T). Die protwonl is wseP ul ond ques ‏موجه اه ول یی‎ iP probability oF oP hits ts bow. © beoner the sertatzobiliy order ts ot pre-devided, ord © rebel Pew trowrartoes wil hove to be voted back. Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 ‏سا0 لح 0 لا سواه 1 جوم‎ 

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+ Odkdatva Tesi Por ‏موم‎ 1“ BP Por ‏اس‎ TG (1) < DG (7) ether cae oP the Polo wer carditis hobs: ۶ ۳)( > staa(?) © ‏)نسي‎ 7) < Prtsk(T) < vekdeaoa( 7) ‏با سمب صصح صمل خات اعد جا جه‎ 1١ ‏السصحانا اجن سحل‎ wih he set ‏ممصم صمح مكل خإه‎ by 10 thea ‏لحي طلسصصصت طايه‎ 11١ ou be exewited. Otkeritoe, vation Paks ond De domed. ‎Biker he Prot coadioa & soishied, cdl here te a7 overkpped‏ بسو كاوس ل ا ‎or tee erred erantics re same orl‏ رجو موسر ‎Ske artes of Ps do cot PP ent reads oD, skoe they ooo Per, keer‏ ‎Frteches rhs‏ ‎artes of Pde ot PH‏ بط ۳ ‎rears PP, oko 1١ 4 ۱ ‏با مرن‎ T,. ‎read coy # ‎Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 ‏موم‎ ‎ 

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+ Ocho Proceed by ‏مت‎ لا ‎schedule produced usta‏ و لا read((P) @:= 0-80 read() @:= @t8O (vakckate) ‏طاسب‎ ))0( ‏طاسب‎ ))2( موه reud() reud(P) (vrakckat) ‏بوابط:‎ (P+) Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 

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QOultple Granieriy © low dota tews to be oP vorivus sizes ood dePice 0 hierarchy of dot yrendonies, where the sual groadandies ore vesied wikia hrger vor © Ou be represeuted yruphicdly os 0 tree (but doo't ovoPuse uth treelochiery prviocel) © Okeo ‏ما موی و‎ 9 ade fa the tree expt, it ‏جع اه سا لصا‎ desveadecis to he sane wode. BE ‏ما سارت الط ماخ روم‎ tr doce): © ‏دما ولو‎ trer): high cowry, high beckon overhead © ‏بحصي محص‎ (hiker fa tree): bru beckiey overhead, bu cowry Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 ‏سا0 لح 0 لا سواه 1 همه‎ 

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‘he levels, starry Brow tee coarsest (jp) evel oe © ‏سس‎ مهو © ord ۰ © record Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 

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+ Nhaecdoa Look (Dordow Ao ockhicg to G ood Clock wrdes, there ure three uddtizodl look wodes uit: نومب سای ۱ rely wk shared books. © elector excketie (D0): ‏وله‎ expla locker, ot a buver level wil: exch or shared booker ۶ shored vad ‏اج له ۲ :)راومه‎ by trot corde ‏جا‎ ‎bobe ‏تناو‎ ty shored wode od exrlia okie te bet doce oo kav level wth mackie ‏اما‎ BB iotewtiog locks dow o higher fevel cede ty be locked to (8 or XC wode without ‏لت الم اه اه نا مش‎ Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 ‏سا0 لح 0 لا سواه 1 موم‎ 

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ح:() جامورا مس بط ولس وا له ی راهم ۱ ۲ + Cowpabliy Detrix wil: GM] x 8 ه66 2 16 ™ | v © | ox] y Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 

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+ 10 ‏مرف‎ Graxaderiy Lookiay Goberaw ۲ ‏مش‎ 7, oa bok o ade Q, ‏سا رم‎ Pokorny ries! ١ ۳ book ‏لاه سا سم وت موی‎ 21١1ج ‏إن اص‎ he tree wast be booked First, cad coay be locked ‏السب نويج ذا‎ © cede Q oon be backed by Di G or WG corde voy Phe porect of Qi raed ‏روا الما‎ Pia ether DC or WS corde. © @ cere Qo be booked by Tir X, GK, or DC erode only Fhe paral ‏خم‎ © ‏لا رفسمه چا‎ by Ti ether Dor GDC corde. | way vexk (hat 6, te Aeon 1 ‏ای مه‎ a arde Godly Boor oF the chided of Gare curred booked by, ۲ Observe that boke ‏لجمشوجه صنت‎ ta reotied order, whereas hey ore released fr ferro order. Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 woe ©Sbervehnts, Cork ced Cnakershe 

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جوم !0) موم رط() ۲ ‏یی و وا ما ول خن عم لاه ما نی مش(‎ euDy. © Outversiva Tivestrop Ordericr © Ouhversion ‏اما سا کمن‎ ۲ Guth sucpesshl wate resuls ‏مش و‎ oP a cew versiva oP the dats tec ries. © Ose ‏موس‎ to bel versivos. Bl Okew oread(Q) opercion is peued, select oc oppropriie versiva of GQ based ‏مسج بط از سس مت تباب‎ ord peta dhe ‏وج‎ of be ord ee Bread cover hove ty wail os oo appropri versiva ‏باس لا‎ Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 ‏سا0 لح 0 لا سواه 1 موم‎ 

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و ۰1۱ دی مر (1) + Bl Cock chia tow GQ ker a senewe of versixe > ‏بي‎ ‎versio Q), coxtctcs tree data Picks! © Content -- the ‏اه لس‎ version GQ). OWA He tee 112 ‏ا ا لس سا‎ a, ام ره ند مس هه رم وا - ( مسج ۰ 0 میس امه مسب 6 0 6۶ مس و و 1 موم و مرن ۴ 0 ۳ ۱ Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 ‏سا0 لح 0 لا سواه 1 موم‎ 

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+ 00 ‏وب و یت 13 یط‎ (Ood) ‎thot inmeaaca Tours a rewd(Q) or wrte(Q) operation. Let GQ, decrte the‏ یت لل ‎wire Roesknop bess tras or equ‏ ما ابص ات ۵ ‎version oP‏ ‎PO(7). ‎6 AB iemeuton 7, eos a reed(Q), heike vole retwrced she ooctect of verse Q,. ‏ومسصصصز خا‎ Toes 3 warte(Q) ‎۱ 7, riled back. ۵ DO(D) = O-tweskrnp(Q,), the vocieuts PQ, are pverumtion ‏سا‎ a ve version of Ge oveued. B Obeene bat © Reads dvs swored ‎© Duarte by Tye reece B soe ober reexctca 7, frat (io he sertdizatod order xéProed by the ikveskxop vokes) shoud rewd De wre, hoe dren) read 0 version oreied by 3 ‏سامحم‎ ker thors 7, ‎© Crowonl quires ‏راو‎ ‎Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 wor ©Sbervehnts, Cork ced Cnakershe 

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با سس 1 دس 3 + BO OP Percutdes betters reud-ody trocsurtivas ood update trocrurtizas 8 Qpckite irrosurious acquire read ood varie locks, ood bold oll leche: up to the ead oP the trorcsartion. (Not is, update ‏وا وود جورخ سوام شم‎ © Gock survessPul wate resubs tothe oreuica oP a cew versica of the data teow writes. © euch versiva of a dota tec hos o stede terest whose udu tr obtatced Prow ‏.)كد اووعصصم ارو رل لاو با وا وها موه و‎ ۱ ‏اه دس مه عمط وم و اوه وه مه لو‎ te-vounter bePore they stort execution, they Polo the wuliversioa tkmestacrp~ ordertay protec ‏جلمجم رطس(‎ Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 ‏سا0 لح 0 لا سواه 1 موم‎ 

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+ Onhersta Two-Phase Loki (Oost) 19 Okew on ‏موه ام وا و مس سل‎ tow! ۶ ‏لاو و ای و‎ look oat, ond reads the hes! versio. 19 Okra t wot wrt on tow © thobtates XC lock voy thea crecies 5 ae version oP he tec tod arty ther version's ieveptanp ty 00. ‎txeurtoa 7, orxopbtes, oval promessiny arm!‏ ی تالا ) + یچم و لین تا مین اه میس بر © امه سس © ‎7 ‎vated by T. ‎۲ ‏و متا اوه ما شم رام‎ the ‏موم‎ will see the uchue before the updates by ۰ ‎© Odd sertdizuble schedules ure produred. ‎Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 666 1 ‏سا0 لح 0 لا سواه‎ 

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ما سین + ۲ Covetder the ‏تعسو مس شا‎ 4: ‏نی وم عد‎ wre) rie) ‏)سمي‎ ‎BO Gchedhie wih deodock Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 wero 

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QOvadvels Weaadiagy © Gypetew & deudoched P here ts 0 set of ronsunives suck thot every trosartion tothe set i wate Por coger ‏متا‎ ta the set. ] ‏سس ورس سس سس سب سس‎ ‏:اه مص وا وه ومیل‎ ©) Require tot euck trowsuntiva lochs dl te dota ews bePore it beqor exeruticr © Aeopose portal orderieg oF oll dota fews ood require tho a trocsurtica ‏حم‎ ‎lock dota tlews ody tothe order speviPied by the portal oder (qroph-based ‏مد‎ ‎©Sbervehnts, Cork ced Cnakershe‏ 10.60 ©00© , 09 جنا ‎rare,‏ "© - بسي مسي ساي 

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+ Oore Oradook Prevevirs Ordteqer 0 ‏ما جوا هچ اوه بشما‎ the suhe oP deudock preveciiod doce. جمطامميج ديه سس ورويوارد ولس 19 8 ‏صا صمت لص كسجرر عونا سد‎ release dota ew. Y/ouager froceuniives ever walt Por older voes; hey ore ‏ام ما لا‎ ‎ives bePore arquirtay ceeded date ies‏ سوه بل رون شمان ‎preewpive‏ — اوه لپ ۲ ‎© chlor reaction reuens (Porces rolback) of paneer nxearion keira of ‏مرن‎ Port. Youre tenets way und Por okey care. ‎© oy be Pewer rolbucks thao wate svhewe. ‎Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 wero ©Sbervehnts, Cork ced Cnakershe 

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© ok to word ced fo ‏موه الم‎ 0 riled back troceavtiows tr ‏تور‎ wily tte origicd teeestay. Oller traveurizes thus ‏وم سم‎ ver ‏موه لو رو نو‎ ts heace avoided. © Pivert-Bused Orhewer | © ‏مج و‎ uais Por a lock ‏لو و را‎ acount oP tere. Pier tat, the usa tives cut cod the trocsantion & role back. © he deadchs or wl possible © stop to kopkewed,, but starvaiva is possible. (iso dP Picut io detersvice good undue ‏اه موه بل اه‎ Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 wero ©Sbervehnts, Cork ced Cnakershe 

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Oeadock Deteviva ۲ Qeadecks com be desorbed os ‏یر‎ graph, whick oramints oF a par B= (0,8), © Oa set ob vetoes (ofthe rxmuriocs in he systew) © Broa set ob ‏بكس 411 هم لصا مه وا ماه نت :سول‎ 19 18 Pein @, heather 0 dreved eke Prow Tp 7, ‏اجا مامه‎ 1١ج‎ wre Por Po release a dota few. BE Okra 7 reests a chia tew pared bein held by T, trea the eke TD, Tie ‏ام مات رای اس حا له ای تن سا وا لس‎ hokey dott tow ceeded by 17 ۲ ‏مرو با‎ 6 ito deadlock state Pod poly P the wai-Por graph bos o pyre. Oye evoke ‏ماه سمل و‎ periodicdly te look Por cycles. Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 ‏سا0 لح 0 لا سواه 1 موی‎ 

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+ Ovudook Detevion (Oow,) موه هس ی وه مرو و مات ام وخ( Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 wero ©Sbervehnts, Cork ced Cnakershe 

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+ Drrdook Recovery ‎detevted |‏ و ‎© owe trocsuniiva will hove ty rolled bork (wade o viciey) to breds deadiock. (Geter thot trocsantion os victcr trot will ‏وسحصاصاب عمجا‎ cost. ‎© Qolbuck -- detercoice how Por to rol ‏و اس‎ ۱ Dota rollback: (Bbort the trocsonioa cad thea rested 3. ‎* Dore ePPeniive to roll back trocsantiog poly os Por os oecessury i ‏امد سا‎ ‎© Granatic ‏موب‎ P seve trocsuntivg is okays chosed os victor. ‏عم‎ ‏و ای با‎ rollbacks to the cost Poctor to avo starvaticc ‎Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 wero ©Sbervehnts, Cork ced Cnakershe 

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+ are cad ‏مایت‎ BAP tuo-phowe ‏و وا‎ | © dete operon ay be perPorned oa Phe ienmunioa deli he hike ‏روصت بنج‎ book oo he ture to be deleted. © 0 tenecnton thot Keer «sew ipl Rio the dotobose ‏ها‎ bet ot Xcode tock oa he tare ۳ ‏موم مد لت موی‎ deer ar ‏لمجم وسو سوا مرو‎ ۱ ‎of‏ امه بنج و بو روم ما جا سا و سس ما موم و ممصم د جابوا نود لصويو ‎prolet spte of oot‏ | ‎© 9P oaiy tuple locks ore used, uzersertatzuble schedules com result the scoa ‏رو وشوو‎ 00 see ‏بو اهر راجت تن‎ be sertaized bePore ‏جما‎ ‏سا بو‎ ‎Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 wer ©Sbervehnts, Cork ced Cnakershe 

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+ ۳ ‏یفن مت هی‎ (Coa) BO ‏ح ما با وه مش با‎ reader isPoreotica tat todicates uta tuples the ‏وه جوا و صطانت ره مار‎ a tuple updates the score ‏.مادم وت‎ © Dke tPorwaivg should be locked. 1 0 ‏شاد‎ ججاوك؟ تمجابب فججك وصتدوممكما حصا لمجوجمجص صا رمصتاماصم جحلا ‎Ossprtde a dota tew wih‏ © ای ای با رام ‎forks ithe‏ لاه و سوه ما سا وت و ‎on he cd tow‏ اما تاه مه سوت طد و ‎or defer‏ مت مس ‎locke oa the chta tec de cet oobi us locker oa chic tuples.)‏ ] ‎Bl bove prowodl proves ‏ای موجه توا رو‎ ‎19 erder loch protocols provide higher coamurreury whe ‏اما بو وا رومام مور ع رهم وم‎ ‏له وه ون‎ buckets. ‎Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 wre ©Sbervehnts, Cork ced Cnakershe 

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Aeadex Lockiag Prowoot © Geer retticg wost hove of leust vor tdex. Oovess too rebaiog aust be wade aly thevugh vor oF the tedices oo the retain. BO txneaioa 7 hot perPorne o bohup cust lock ol he teckex buckets thot it ‏تا و مه‎ ۳ keert a hip | ‏صما‎ reksiog wikout uzdatin of edo wr BO Dinet perPore a bok oo every keen ty Pied ol nde buckets thot cod hove ‏و له میم‎ potter io tiple f, kad existed ready, cad ‏لم سمه سوام‎ Je oc ol hese ‏باقن میاه سوه( ,ماس ی‎ ta X corde or of cee یسب اد با اوه سا نس ام با و ‎Bl Phe rides of‏ عجوت او مساو متام ما مه ۶ Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 wero ©Sbervehnts, Cork ced Cnakershe 

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+ Oak eee tt ‏ون‎ Beyer vowstewy! dPPers Prow two-phase lochiay fa thot G-lochs way be released of coy toe, ood locks way be acquired of coy tee © Gerke cust be held til ed oP ‏متس‎ صصح جد كا مسحت اج لوج وج ‎quarnieed,‏ ۱ ‎wll occur]‏ سا سای | © Cor reads, eurk tuple ts locked, reed, awd lock ts kewedtely released © Glock oe held ill eo oF ronsuniiod © Gpectd cose of dey cebu) Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 ‏سا0 لح 0 لا سواه 1 همه‎ 

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+ ‏رو ات ول تاه ماو رل وراه‎ 6 OGL ۲ GQ) dhs ‏تمه للجم‎ ‏لبق‎ to he dePout © Repeusbl read: dlows valy cowed records to be reed, cod ‏د و‎ * however, the phoiow pheaxweurd eed ot be prevecied — M1 way see sive records ieerted by TO, but way wit see vers ineerted by TO © Reed rowwtied: sane we dower ‏رم مب‎ but woot syste ۳ معا وا ول موی هو صنوه :مومس ‎Reed‏ © Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 16.60 ©Sbervehnts, Cork ced Cnakershe 

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+ ‏و‎ tr tbe Gnpree 19 Aedees ore ‏ای‎ other ‏وال‎ tees in thot ther oly job is to help ‏وس و‎ dota. ۲ ‏اس ,اه رس امه راو و و‎ wore trod ver ‏ها ماو‎ وه ‎tiews beads ty bow‏ ال ان سا ما رم ۲ حجمه ‎execs procicdiy‏ امس و لو بو بل ‎oo oc‏ راما مین( سممی 19 71 57 ‏وی لصو ما و بات‎ wove ty on fades os bro os the aoourapy oF the terdenx ‏ای و‎ © do porta, the exert voues reed fo vo toerodl ode oF a tree ore inetevadt sv bboy os ue oerd up to he correct led? ode. © Vhere oe idx cowunreuwy protocols where lochs ‏و اوه مه‎ ore ‏تاو( ومد هط ام له رای لاور‎ Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 666 1 ‏سا0 لح 0 لا سواه‎ 

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+ Oomnav eda aise ‏ا‎ BO Gaenople oP tadex coowrurreuy prove: § Ose orebbiag fosteud of two-phose lochioy vo the ordes oF the B*-rer, os Polos. Ouray searchlicseriva/detetica: © Crt lock the rvot unde tt shored wode. Rte lockten, ol required chided oP a orde to shored code, reteuse the boty oo the ode. ۱ to exckeive woe. Oke splitec or codesrioy requires chooges too parrot, looks the port ict ‏علس دفص اص‎ و مره و امس هامید وه ی موه امس سا ۲ ‎tree protocol‏ طظ) ع ,سم ‎Geto 10.9 Por var suck‏ Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 ‏سا0 لح 0 لا سواه 1 موه‎ 

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Gad oP Okaper 

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4 Porta Gobedue Oudsr Tw0-Phose boohiog lock-x(A) read(A) lock-S(B) read(B) write(A) unlock(A) lock-x(A) read(A) write(A) unlock(A) lock-S(A) Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 666 1 ‏سا0 لح 0 لا سواه‎ 

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(1ه)5-اءها lock-S (a2) unlock(@,) unlock(@2) lock-S (a1) lock-S (a2) lock-S (a3) lock-S (a4) lock-S (a, ) upgrade (a1) موه Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 

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: book Tbe Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 wor ©Sbervehnts, Cork ced Cnakershe 

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Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 ‏سا0 لح 0 لا سواه 1 موم‎ 

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lock-x(D) lock-x(H) unlock(D) ock-x(B) lock-x(E) lock-x(D) lock-x(H) unlock(D) unllock(#) unlock(E) unlock(B) Took x(8) lock-x(B) lock-x(D) uunlock(B) unlock) lock-x(G) unlock 1D) Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 

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read (B) B:=B-50 write (B) read (A) A:=A+50 write (A) display (A + B) موم ۲۵۵۵ )۸( display(A + B) Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 

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write(Q) read(Q) write(Q) Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 

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+ © ‏واد‎ 0, © Oobediie Produwed by Ostaq Oukdaiva read(B) read(B) B:=B-50 read(A) A:=A+50 read(A) (validate ) display(A + B) validate ) write(B) write(A) Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 

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Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 ‏سا0 لح 0 لا سواه 1 موم‎ 

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wor Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 

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+ OvtPor @rapk Dik Ov Opole Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 ‏سا0 لح 0 لا سواه 1 موم‎ 

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+ OwPo-qork Otk ® Opole Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 ‏سا0 لح 0 لا سواه 1 موم‎ 

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lock-S(Q) read(Q) unlock(Q) lock-x(Q) read(Q) write(Q) unlock(Q) lock-S(Q) read(Q) unlock(Q) ©Sbervehnts, Cork ced Cnakershe wor .- ‏مطح نه‎ Ory 2, 0008 ‏عونت سي یی‎ 

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‎wovud Pie wik ۱ 2 ۰‏ ۳) و67 ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎a ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎Penyridge ‎ ‎ ‎ ‎ ‎Perryridge| ‎Mianus ‎ ‎ ‎ ‎ ‎ ‎ ‏موه ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‎ ‏تالا ‎ ‎ ‎Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 ‎ ‎ ‎ ‎ ‎ ‎ 

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+ Sheerto oP “Olearview” eto the ©*-Tree oP Pique 16.00 Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00 ‏سا0 لح 0 لا سواه 1 موم‎ 

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Ceadrwe Gyetre Oncweptr- O* rare, Gey 08, O00