Fromsacfon — corcapts - -Propertfea - ScRodutes - Ser lPeabl ity ~ Coneapsuney Comho| - Twop Rese lock?ng — Tee Antique. Single - User Versus MaulHurer Saline On crtlerfon fer clawtfying a lotalase acalem Bs oczording to tre tuamber op ted who con ure the | Sym Concussuntly A DBM 3s & wa othe Pol most OM HOY wai ean wre) the apie Land of mulifwser reany users con Wwe dhe spb — and Ronee aren te atlotabare - (or uurrendly + Singh = wer DBMs, me mostly woshicted 1? persons computer aypame; & | by Rurnolrcel most other DBMS = coe muktfuser- won Occ dilabaure - Mutt pl. Ase 1S ond dae seompulae ayslins ~ of the, coment of sub programming + which allows the operating apa op the computy feenecuts nucltiple Programs - 0 proceea - a) the coma tem A singhe central proceming unt} (CPU) can sonly ernment ot most one preven as} 0 dime. | mulitprogrammtng operating tyslrs enetats ome — Commands — from The nent preces . anol 0 mn, ° & i ! ae ae B ' As) t t ' ' i ' ' t ' . 4 1 1 ' ' is Se ened taste ease ———— cpd. . ‘ fh , t + D> tme #6 toy ee £¥9°42Intevleave cl processing Versus powltl — processing of | | wnuswuent — trandacdiens. yesumed at the pofat wha | frees | lin he was Auspendect wwRenever 2 gets ws dian to Lae dan cpu again. Hente coneurrent meetin Mlustraleot [Of processes wo —oetualdy inte weaved | a jf the aboo figure 4, uti Rows two preceves , A ard BB. ent unting conc nily fa a Lojer haved farRion. Inderleaving Keeps ta CPU © scamed win EN scomer@ busy whan va procet4# — Staquufres = ain Lnpud or outpud (so) operation, uck as reading bhok promo cpu, if suileRed do eae — another wolfe. Ra process wother ‘tec! -remartarting adden clurthg alo. ies fe me paid tm rte mations p vatttery “Wea. recenodisnciteny Toley leaving oo purer @ Long 4procems 4rom lelaytng etkey —- Procem ety gf dhe compater splire Ras rnutfiple - hensive prc ER Povallel processing) of proves e+ 2% — pemtble oe -fllustratedt by raudtiple yg ctguy Most of the cand dotaloases procese tory Loncev ning Concours contrel 4? Ss davdoped So kerms Of Sorter leavedt Concurrency. for te vernciodar op tide Pape 30 4 dats thems axe te pritmaty Ae mullfise OBMs . te | SHoved resources dst may be Indewattive we%4 ov occured — concepuenty by applftatfon progeny wRrk cormtandly reimevtrg {ngormoston from are moelffytng re dlalaboreTrews actfons (® A drarsacifon san eme cutter program wheh form Angtea antl ap lata hase: processing. A dyarsacktor graacdes OTH OF Move velasabose operator wet — Freludu s tarevtten , iledfon , operatfor rodifcatfon oF sud rieval | Orn wot of apectt ying whe dronsactfon begga dy apoctqathg enplrct aletaments- Gt read (A) transaction hie AWB & write (A) : read (8) End dromacten gis BYSO urtie (8) op hicoXton program, Aly databare operators in an quo boundartir are constdered 1 between ture A atnglt applfcation Program drandactton- Angle more than on Tay conlato+ drondaction, tf contot na poverad boundouts transac tion Contr th, baste databese operations thal va Hontactfon = can fncluce as followas-@ | | read - fem (x) : Reads a -clalabare tam ramd Soto oo Program vol al. wrfdes the value of — program Fern worud wel, ‘” jwvite — Hem 0) * whalabare lvastolule * >! Soto the Bleck > Wh base antd OF dob, Exansfer from lee tO grate, roerneny 2 orn — bleak ERS es ceases | eee te ele follows rg taps Dir the addro Of The dai block RRR conta = tem sel 2) Copy thal vase Block indo mein memory ned vabreacly bajjer Lt et ABW Bleck a owe mtn iroemeal buffer J 3) Copy Here x gro he buffer do th program vastioble cared % Enecud?ing cole tem (x) command Tacludey he cfollowtg abps + MET af Be bk block uPAh comlaffy Tee X © seamed wino| 2. copy tad ldk block Soto a buffer Bo man memory ( gg thet! block 2 not already In core main Mumory batter) | | | | i Gsey seco. atere: program — vaxedallh ot keto tts correct jocadion fo the boudfer. A. Store te wupdalid block from bugger ork do lek Shp 4 actually updola dre plotabare on alk. de. outer & not teamedtate Ly Gn some = eoaet abired to ak. Bo Oe dalton cRanges A Vransactfon fe dog teak UHP Of Work on we aka locure - Begin dransactfon read — fdem (x) uovtie. — tem (x) Ecch trandactfen.| Transacdtfon and Systim = — Concepts Feansaction — Atatles and Addttfonal Operation. | eee ——= A draactfon an vauttomic nth of work ted Routd efter be comnplt 1 e So We enttyery i A o He vet lor nod clon ot walbh. 1? VECO VY purposes, the of wheo each Legit neds %© Koop Awack hravisacitvn Abels + dermtnale* 1 avd commeda . oF akorts. Treredore , ee ve coverty monagey othe Dams nds to | Wp krack Of the follow?ng jopprastons & | BEGIN- TRANSACTION + TS motu the beegtontng of | dvansaction enecutien. IReap ov write» Rue (esminated Fig? Stole Jranatiton dgram — fllastading te sialo — er dramsacdion — enecutfen, Hommaq — -TRawsaction + WA afgnadls a auccenrful ero. of te = dramactfon 0 thal .euny cRanges |(ypdatix) enecutecl by the ttandacdion can be Ao feby commt-ledl do dhe clatnbare ant will hot ee unde. |© Rot, BAK: or (ABORT) > TRi gnats dned — thee dramacton fea enclcl unsuceemfubly , 0 traf Ong Ranges 0 effecds thet Ihe thansacttOn ray | Rove applisl to dhe database must be_urdene. ae —_f?qua 2 shows ihe Stab dransPefion vakiagrarn apoct — Tlua-lrates Pow va trantacton — moves larough fe eowenrtfon state. A dramactin goeo fb wan active Ata Pmmedialely agler tH Asoo, ‘onseudfon, whae Mean erueuti SMe — READ arch AARITE operations - Wan ake transacelfon ends , teettally torpedo Move ao tte paints comm types Of ConewOencry contol protocols Wray clo addtional Racks do see TP the charsectfon ean be Lommt ted Oy nod Also «Sere “weeovey protocol nud fe eras that va og shies (oPls whl not sudabl &> an Ihab? lly to vecod tea Ponge og dhe chancacsfon — permanently. Te er Chocks = owe uceemful, the. canectien 8 \ | sate do fave suacRed tke Comm poland and ener | dee CommPAdect permet Teeovetyf from foSlure, — TRe tog Bow 5 on Leequential + appenel ~ only {su thot %3 Kopi La «20 tt rod tected by amy type of fail entept ayptoby + Orme More tog _bapfeys Rol, fast pont of te log file, Bo thal leq enter De dtvat addi to the fog main — memory buffer - kun the dog Lohfor 2 for AB oy cataatrophic faP Uae. mein memory buffers, call the “lle por hin arden thy corddfons cau, the | bog buttery & oppendedt to tha eno of he Jog BL on aK.Desi rable Properties of Transachfons. i) Fransacttone pRould — posses reveral propeni¥es, thoy Ahrouto ogden ceallad the be engorced! boy ActD proer Hee the Lpnasouncy conto). ancl HRMS. TRe followtag DLLEOVEDLY rudiends Of Khe an te ACID propertizs’ x Adomecety : A transaction Ps an atomic und pRould efty be pea formed Sin proceming et a i li es entirely or Ke Constateney Pamaervatfons pe conriadency pouserverng » meantrg theel rg is. || Pa Complitally erected prom beginntag — to enh pom Oty Avansactfons , fH not peofor mad a3 A dtansacdon should witout — inler ference Rourd take te chotabars f70"7 One constsiend ddati to another. % Teolotion : A trarsaclfon should — appean as pareincasaes teough gy being enecutecst tr esolatfon fro Arormacttorm, even ahough mary dvansacfons = ae ensent Fdray Loneuso od ly- Ray Ls, the erecurifor { la avarcacton ARoutd hot be interfered with bby any otter transaerons errcarting conenmound Gy, © seamed win En scomer®© * Davabt lly ev Permaneney covamtdect amuse © fakloe do dhe. latabare by 4 The Ranges appltect dramaciton — mnt pevakst — Po the cata baw. me 4 | 2 Oost because. cu Ranges must nel be pecause, of cine SRedubes ( SReclealt ing of changaccttons ) A Ordar) A si Padule con each compe etry of tas Ws Ty pes sRraulke | L-— () Complete ofthe whore. tornindade CRronologtiat ereeuitfon dequaance (jredepenact of oO shana c{Pon ao cealtial a otReclule fave many taanseactfons Jin Po va Humber og Pastuctfono a of Achedulus: ge le Complete eo) ae alu L\ wefdub a) pihedule A achaolule that conbatins comme or each trarvaec 10", en abore = OY aciipns «ate Piet tr Ho fy walled a atfaclubs. - filtey the doarvsa c.f FOS ARoutolFe, lly amen eed Fant alyy- compet e 2) Serfal Seledule md & acdsclule Go woe F: . after dhe complietfon og ow \ransactton , 4eloneh aeainae Mon ediv o acRedls of For enomph wnt dakes Place - oe Te 1 ABU re dhad A= 1000 » Bz 200. TH, tranaactore | 5 1a. Non. sertal fy gy Om acedule. » tm UBER dhe | operatiorm fore o vet Of aransacttons ull) be panded TW 2o qrvlerteaved. manny dd Ps cobted, — 0- peso) acheclulle.Si a vv do Ax piloe - Ac Ax ov Bz Br loo B Bx oF A) Sevfalizable schedule A schedule wobd to be tentoble , Pf 4 ) H Bo nen- seal — Achoclube we a : ti) 4 producu te same sus! © Athal of Ws ep valind essa) Bbadule- Asaurre A =(00% Ibe ance | am output of both the Avadulas 8 *S* fo Ae NO vane Be VI. Mu, game. Vence Hae uel od non-seu Akedale 2 2 pesaitxabls asthe equtvatan yl sorted ARodule S\- G2 [acxdtaltzabl ] © seamed wir Oren canSeva? xabii | 4 A gdudule *S of nook arvenctfors Re 4a Sy egyttvaland to Somme aestiad orurtivable th dhansact?om- ahés proper by BQecdile op te ial 2 anllad — tertabtnalst ty: Emample of Gerfaltxable — arhedasle ov not ? constey — SRadule S- enki es Tia Me _ Read A after updatien eM |e Read B vefpre updater R (2) ‘wo (B) ler ue comin arPodats S0 SO#S2 ort Rack aduther ty OE pestaltrable arth Sor not. a N ar) oe) Rea A afler Uupderlfon wf 8) rR Read B oftey upelatfon x a8) S48, Paes er falt abt] © seamed wir onEW ca@ B —+ _ “Read A before updeton > pa Read % vefore upedatton . a tala S48 {het aevtalizee wg) Sa DT b& a mae gevtal ahecluls (Rot sevializabul} co (A) u R(B) Hene S#Ss a(n) w (B) » Conglfel Aevfaltmabeli 6 - operadttons ane cainl fo be aottaty the following cond ?How: cond — equivalene. A pad of Joo conglfct Hh AY D Both — operadfons belong fo diferent toteyrrsaccions a) TRuy accuse the same tala: 3) Dd lecat one of = He opevatfors Ts wrth operation. Eg’ le Te R(AY Tot RA). All the above cone Piforu 1 2 au not aattsd ted. only the RA) Hfrat two undPHons ae Ra) 3 Aah?spied. 30 Non- conphed pao. © seamed win En scomerqT Ra) 3° RA); a A> wit®) x Re(B) Bow ove 8 2: REA) few (a) A Ra Cond PAfora ars. Aoliagted. Henta , Conplild pata. No} cong l?el pads. Because ‘hoy ace déferer! dob. © a te the — pods ry of operators o Sin cong pat _ So Swappect 4 a sis R(B) = Ra) S\ = S2 A Ty | Te Suxppe —s WO) 6 WS. RO) congltel pads Whan ae 2 atuduls eyrtvalint 3 types of = 4 Radide equi valinces ) Ronudtd — equa valunte 2) con gifted — equfvalenee 3) Virw eqivalner. © seamed win En scomerBared on the Types of eqyak valence , da4pe-rer| © aertalt cals tty ove dojgrod . Toy ase, types ) Raul aertalizaloe ty a) vontc\ Aertali talek ity entalizalet ity 3) Viaw 4 Result eqprvalent + Result nevfalizalsility. yoo! = equi Valenee 1» the end vesull %f schedules of achodula , 1h firal vols acfedssbs (given ore aia) ard aoraltxobs tity to not Sn Feo rty depend om Fapatt jor saleulalid for both fuck whether hey ane equal - Result generolly ured because of Serato prow.oof ltt exprivabence. 3Redals — are. cong Seto anotley . by congltctieg od facen! “lho i Nea eqivel nue ® ep Huy can ander charging a opera ors. aed, 8)» S1 ae cong Ret Dinars tas ee (8) | BLA), 2 Ne, eel : t SS WC) RQ, (B)- be Teaneforudl sore Sequin te of non. S Ruck — whet | equsvdind OF nal. | Si Re) | | a9 oh RA) | tte ‘ S\ 4“ Cx | ——— 1 RH Rs (B)2 3 waite m 2, @ ~*B non- vongitet pat fy cong Ife hws a & Ro (8) s on Gnrlev Rangeable ye Hey Oe Rack abo tier equivalent! or $2 conf lfcd equstvalinee the (Red Si tod: wri G. x SD au © seamed win nen scomerS1-- 3 a aa 3S A a —;,;—41 Ss m; (A) wit) Qsle) ? ws (0) aa & ook @ : Wyo) —i— ;-#— ; ois «10 a) ®,(B) ws)! a By yp alll ye he lt,| | le [ale ae aed we Sie See) a” Jt aot ye i SS Rild) (8) w(C) wf O Qle) RQ ni) wo) Fn Ses f+ (Zl son be PnercRanged , than agtis het Bork Parged » 3) an be tntercharged wrth eask offr [osm #09] x tan be After compltfrg dpa» suoppiing 3 RS Oe cong Pot of hon. comn{ |e pos op So, firelly equivalind . / SES sam} © seamed wit oKEW canCon{itet Serfaltzable schedule @ pr ahedal. 2 congitel aertalwabh tf 7% % cangitcd equtvalin? to any of —rertaltvalsle acts duh. Jeting of cong ltt sonal iced ly Method - 4° pore watt. ake gfven atedul fo Dipsarvony \e First Find te congifed ditperont dransae tion. pain (Qu vn vt) on aame Vaxtobe bY 3. Whanevey cong Ife pau occu » wht the dapendsncy yolatton wk 1795 a4 tong licé pe ee ay. Sy (Re) 2 17% ay Rack fo Cee Ff thee RB a eye forrned x PP yess Pan not cong ire! periclizobl. wif noe fen cong lic! postal abl Enevaph: cfack wh ther the afetule cong lice nevialtyable or ml? w, (2) 7 RAs ® (8) 3 wi(B) 5 ®, (B) 32h OG sui | ® \@, (6) é _conplied pats: nl Rr (A) 3 (213) Wy m: R “) HR C ($3b) W.0B) + RB) 5 w(B) PulAs 6 © seamed win En scomerDependency sulation ) w (4): (A) > TG Wi(8) + R28) >) G|F>2OG nlo cycle Ls formed , - He gfven oReclule Ss cong fed Aerwalizable 4(Redube Method 2: To test the Cong Pet Aerrali xa bt lity we eqn crow 2 G* (VE) wher Vie veetfcas 2 no. opt teansec+fons. E> Edges = for Conplfetfng pati Sap create mode yor cack dramac tion. ° 9+ Ltd the cong ted poms. . edge fv congltch por 3. Draw Bo cong ltcl pain , draw edge fy ws (B) # RIA) A wT: from A eating conditions — for conglice# Aorta xa bidity ¥ OF preceduree grapR By eyelte Re given Pa perfalina ble AcRedule 2 pot colic . x Ig precedence gph acyeliic given ockedule 2 conflict serial Prolle.@ hater he waddle bs confit rertali zoluby Rack oo wt f 3: BHO) 5 Ral § RB) 3 B(8) 5 Ry (B) 5 wr (A) 5 wale) ‘ 2 a A = e 7 13 creck: a node for eat bramactEen. © ® ®& sha: ginl Ha worpiicl pals. 13. conhlicd pots. AQ) 6.7) % @) +s w (B) 5 RD Qe Wy aioe He) Qs (a) 2 Ui ce) ws gs) ace) 2 (8) Shap 3 prov « edge fF ack confit! pol. G75 ~@ Re precedante grap wo eyclfe , hen fhe gPren shod *3 hol cong cl aevtalinabh. Ww sqpdvalend SRedulle. conatdar — 4u)0 phodtes > S2 Hay aa candi Hons woth tp be vasw equfvalsnt , re Sdloating Oma —_ lala gntRal Tea nwt be Aare === on le 8 wen wo RA) Sy 31 reds 4 fom edakaoor® 2 a, reads ? gem T | 2 FS | condi At6n 2! dronsactfom and Ue Re ag dia O02 TWO view equiveln af fo uplatet by TF &) qiadabs 8. ond gs Oe Te reads A and dun A: Reod Hurt, Sequence B | Radule Sv (Rw) dequene , Hen go AGadule S24 Gp must read A aktck ARould be Updated by 1. @ Rod ore (rw) | equante Muar ee dame between > Se pont & Gs. a | mo \% | ——— — | ©) | au) wl) | ws) we) | ® Re) | oO | Quta) 2 A) | &: no read - wit —Sempunu- | oS FSD.Rod be dame in Soe Ind OE aprrations ! \ 1 ) q | To | % um | So 1% tote) | ; | ~ Ee iQ | es tal) | wf) | Rs (8) | | : we) ) | a2 dfral updati of * eo dm & B gs: + final woplatt oe A 3, dam do on 63 tS aerraltzable pthedule. A schdule ve gevtaltzable . if 3 co ey werval AReduh « wRafy the Agedule 2 view — aervtaltralle as view aquivalent | Ruck oo ont} r Ss: 2 (8B) 5 RAD 5% (A); Ww. (Bs wo (B) + 4 (8) volulton, ytth g transactions dotoh number of acReisbea a powible we 31 = & | te | T% 2u uw > RD. rs c. 3? oR (Pp) | @gtt)s > | a TT 7 aw () ema ! Ws (B) +. LT TG > & Sy Te Te i | © seamed win En scomerShy + Final upzleds —o dole Sam A oy B. @® given scRedabe the fal supdaka done He wera Aaduhes fhe 4cReduls beck go the on ote & fo TH. Herne out of et % ee) ee % Te Tr > Ow made Pn) aupelali dey Ta « in |e te > a> Vents. ém on dale stem * og th calor «= given oRadule, te 7% on Aste, BB BOM go fa (rs @)). so. prom th avatloble sertol aRedule 4 tatttial 120d Aboud be done ov | BF rtRat Feadl by chips: Reo writ _tequenur_ on Aol, Fem 4 or & In the ghven pcRadute. » te Ttad corte ey Bo (B) ¢ WCB) B) BOT. eqn Henn Ln only equivaliod rertal the available flon % 199% 15 Re dul valo yas the Wene te gtven aRadule Ys vew — derial¥ raleConluyren oy Condo @ When mullipe aRoud resource, , Ahi. could arte transactions ore hy fag oo ecm Be a rane} probhims af dhe cea conthal 2 not clone property. mire are some Smprotant mecRaniims ts UR acer conbal ean be rmaifntaired . tke concusany como) wb fraplemuntic! thenowlfeally. uatag —esentllvabali'y | practically «Hwan be Pmplecrun tet by 2 mecRentsins VY Leck bared protools 2) Ree Akampieg prod iols. Lok bared probok _y wer, fs rapomPbh do wit Conta tent conewuurd Hranaactfon to fimplumint | conqusunt condal. nim. stamp probuls > Splim tslf bes de cleticd pout. Tmronats teney during Rena | | enecuken avd eth the TneonsPatency DQ i | (or) avordud, re Lovoredt © seamed win one scannerClavi{Peettion of os , Conon te t Mt antl) contial — paotocal Locke \auveet prolocols i) Iooy York 1 D SRared / bxclusive (or) Riad Suit. (ret va phrore locking prodocal, ane Stamp proloce 1 dyene Ab euap ordeing polo. Loe eng may anotsied = te each LA lock yao? alte gy sued do tdandify the Atalor 4 (usta ther Je wlale ds dp once tee valake Ter waletth he ate EO Bb fo we nob) 3. When o jrarsecdton + taten dol, tm, He mth tn nares daa euoirabed dow F. gransactfon drolda the tock.» He 3:I{ no olor ce He aol, Th fo G dransacttor % wank to acaw de fad, 40 Ar 3f anole rare dats flim , dive we pre vious dransacdfon releane ve dock. hhamactten Tr has do waht undt) Fhe © seamed win en scomerv Lo > locks fe dake Pam A D> Raads He cake ihm # we) 2% wrie jr dole fom A > unlake te date Fam f° ow) UB) > berks the dots fam B. RO) Paes O Fransaction] qrant / Deru all locking adefails- Binoy lodts- A bThay Dole won fave 2 stots ©) valuy ¥ Jecked Gr 1) ancl » Unloded (or °). Re ewoent Azote br valac) OY tre Lock anouiale wrth dala gem xX as bock (8),Operctfons ured satin Bros locking. @ e Souk Tew § vocer, 1D an fem by frat Drautng pn drawaction — vequreod-4 cq texte Herm (x) oper fen. * of Lock (%) = | ov Los) + the dramactton [4 forced do wat * Tf Lok ) =o oy Wo) : ff do ae dol Cthe Jransactfon locke the Her) do o-ceu 14. After tie completfon af OceE wrth 2. Unlocic - Tem: ae the drammactton Lous ao operation ate hota, fers unlock 69) » week pets the operation. Lock (20. &) , unlock te sate ttm x, Go thet dk van be | | tho How. | oceemed by ole, transac’ ‘Roba (oe A Hansacton qT mt sue Ae dock cy) or wrt (*) joperation before any wead (% [operators Jo T 1 8 A tramactfon al) raad (x) and ug? JT obucdy dotdy te tok Pour & tock () operation. @ vs Bou dn unlock (1) loperodton after te (6) Ope rertfons mt i |g. Sp & dramactfon on ulim xX, thon 7 um rot Pold va Lak an | ATP a tomactfon q does not | | img, Men T wall hot fou an unlock (1) 6peration © seamed win onesCrag: nN WU To. J ii f(A) o) |e R(A) Ua) L(8) R (B) v @) 4(R) e RB) w(\3) v@) Trplernentotion — oF Birooy locks a Bs Fenplemented wing 3 ffelds pus Plowed. Enecluatve locka- TE oy srardaclfon Te Ras dockid th daly ttm A 25 enclave mde » ten a Sumit fom anode lansagien Ay oo Ff eee ¥ & (4) 3 dented & RA) > wolenid.compatible dable fo 8 le oe key. ® Arawnedtone Th Rolls 4 on. | " go choud — rode g wn, - = Yi wen |e Ves No x? Balusive mode fo 4 r hy No te RSQead wdata Be, am & » SD) 3) | | Dota ern coi dred | Oe |enky tore | Locked « | Tryp! enundatfon of wo ORE Lotk compatible dodk srolds the flats Of a Ratt, SL Bs botket or nod Sle Socks. tmplemanted wasting 4 fielols: Data -fem- Rame Louks No- of « vrewrds 4) Locking ~ tamsactfon . thet! ae dings Duk Jab de be records = {ov dota Plerms the} ceurrerdly unlockel. TR dystim — maiintaring © seamed win oxen scomerValue of bocle ts Road locKoot or — Lavile akg dp bork (A) © worl ~ locked. : qe value, of ecting ; Aanacio 2 a sfing lt tramactfon fat folds the enctlufive dock 07 A. value, of foe bing ~ Tg Lock (A) = Hea0l - locked! + ‘TRe hrantacttons dramacfion JB of Ore (or) more tho! fold the Pod dock on * dwout the Operatfen S(h) wi A fan ff must f veal. Jaw “) % x (PR) or unite lok (A) be fore Wy Tead. (A) operation 2% per formucl QO tan 7F mwt fasue the operation x (2) op sp, WG ae untie Louk (p) , before Any write (A) operatton bs Performed fn T. 3. Djky compltfon of alll Sead (4) and unite (A) operotfors So 1, a dan T mat Prue san unloc ka) pero fon - ae gg san aalvendsy holds -0 cShored Lock (0) enclusive Lock en fum (A), then dan T willl het Ldue on unlock (A) operation © seamed wit oxen scanner5. DP dan dhat lreaoly Rolls a dock on Hea, & 2 cellowedd do convert The Lok fon one, bockeot Ista do -anotfey — suinelis sear lain cond {Toy Upyred ng to. bor by Pung a cots loka) operad fon (01) tonveysfon of read lock 09 te write. bode 0). * Dotungrading the Dock by tssurng a read dork (8) (m2 tonvevaiOO of Lord lok do read. or (9. 2 phase Locking . ee docks oO & le Locks cloes rol Jttarantie Binary sesttalizabitity: Te ensue seta sobs It 4 2 phare lacbing (apr) & aed. an tats atRoree each tw omku looks @ unbocss requ! Go & phase. [+ Grouting phase (toextng Prom) an ant phat » nis on de derived .clata Hem can he acaptatroel be veleared Lows but none Can ring pRove (unlocking phored: Ta ats phase, 2. sPor velearcd , lat moO nem boc ky ears ding Docks can be scan be = cqurived. © seamed win En scomer(i) ¢ Lo) | 18) =D Grmefhg (oy Locking pPevw. AW 7 Lett pote J bast ack postion Gy {trax i 5 ) ow 1 unlock, position | ule) > abniniethg (ov) unboching phous . 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