Đang chuẩn bị liên kết để tải về tài liệu:
High-Performance Parallel Database Processing and Grid Databases- P9

High-Performance Parallel Database Processing and Grid Databases- P9: Parallel databases are database systems that are implemented on parallel computing platforms. Therefore, high-performance query processing focuses on query processing, including database queries and transactions, that makes use of parallelism techniques applied to an underlying parallel computing platform in order to achieve high performance. | 380 Chapter 13 Replica Management in Grids 4. If the originator site decides to commit the transaction it updates the TS.SID at metadata service . The TS is increased to a new maximum and SID points to the originator. The local timestamp of the site is also increased to match the T8of theGrid middlewiote. 5. Other replica sites in the partition participants also follow the same procedure if they decide to coininit. i.e. theeiDisiet to tlKmv speciiveparticipant and the local timestrnnpiieetto matchtheoewTSatmnedleware. Bni the SID points to the originaloranO thelocalliinestetnp is nctinceeaseeforeny site that decides to loceltyabori he write traneaatiee. 6. The number and detailof siiesdariicipntine inlhecoiHingenseuptlat.e process are updated in the log.Thisisan imeertant stepihcTause ler miioCec of sites being updated does nol.loriei deorum.Thes after the nortittonmg has been repaired Tie loe isusedio pronarate npdolesioadeilioaalsiten that will form a quorum .Onto diequonmi haabeen lormed naniaO GRAP operation can resume. Figure 13.6 is explain o.e teltowd Wquoemn ie coiteateh for hie htattem to be wntten hue 1 . If the neawoekrs noasntftttroeedaod thepo eotedduorum 2. is less than the required wrote qnohomt2w ime adot r nhK obooted. But is partitioned line 3 then dieprol. iCi woikt under the contingency quorum that is the actual collectedquonim.Tee ooi jcueen local renertempaheie piii IiOoii where the transaction m suemihdue andtdo moxneumtimesaampatWeGrid tier the respective replieeh ereobtaOned.If boththe rthatheum wdueudonot matcho then the transactionir ejoihi ti ilmr Ot.Thii hnpitea doe ter cneWnondof nat have the latest replica if bote timuetimipsmateh iine5 hut iheorinteetor doetdeu to abort line 6 thenthogtobfarroesactioe wfilfhort. If the originator Ceaiderto nammititine e henpletpanroctton ean continua the execution. For each eitem the originatear e oorOtthP aete8l tOe m dte e a timestamp is increaren to e .00 110X1111000 epe new site CD oSIlii doa the