{"id":89872,"date":"2020-07-27T01:42:19","date_gmt":"2020-07-26T23:42:19","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/raspredelyonnye-subd-dlya-enterprajza"},"modified":"2020-07-27T01:42:19","modified_gmt":"2020-07-26T23:42:19","slug":"raspredelyonnye-subd-dlya-enterprajza","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sq\/blog\/administrirovanie\/raspredelyonnye-subd-dlya-enterprajza","title":{"rendered":"DB t\u00eb shp\u00ebrndara p\u00ebr sip\u00ebrmarrje","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Teorema CAP \u00ebsht\u00eb themeli i teoris\u00eb s\u00eb sistemeve t\u00eb shp\u00ebrndara. Sigurisht, polemikat rreth saj nuk pushojn\u00eb: as p\u00ebrcaktimet n\u00eb t\u00eb nuk jan\u00eb kanonike, dhe nuk ka nj\u00eb prov\u00eb strikte... Megjithat\u00eb, duke q\u00ebndruar fort n\u00eb pozitat e sh\u00ebndetit t\u00eb zakonsh\u00ebm&trade;, ne e kuptojm\u00eb intuitivisht se teorema \u00ebsht\u00eb e v\u00ebrtet\u00eb.<\/p>\n<p><img decoding=\"async\" alt=\"DB t\u00eb shp\u00ebrndara p\u00ebr sip\u00ebrmarrje\" src=\"\/wp-content\/uploads\/2020\/07\/35c8b29bb024cbf383d78caa1af2c525.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nE vetmja gj\u00eb q\u00eb nuk \u00ebsht\u00eb kaq e qart\u00eb \u00ebsht\u00eb vlera e shkronj\u00ebs \"P\". Kur klasteri ndahet, ai vendos - t\u00eb mos p\u00ebrgjigjet derisa t\u00eb arrihet nj\u00eb kuorum, ose t\u00eb ofroj\u00eb t\u00eb dh\u00ebnat q\u00eb ka. N\u00eb var\u00ebsi t\u00eb rezultateve t\u00eb k\u00ebtij zgjedhjeje, sistemi klasifikohet si CP ose AP. Cassandra, p\u00ebr shembull, mund t\u00eb sillet k\u00ebshtu ose ashtu, jo vet\u00ebm n\u00eb var\u00ebsi t\u00eb konfigurimeve t\u00eb klasterit, por edhe t\u00eb parametrave t\u00eb \u00e7do k\u00ebrkese t\u00eb ve\u00e7ant\u00eb. Por n\u00ebse sistemi nuk \u00ebsht\u00eb \"P\", dhe ai \u00ebsht\u00eb ndar\u00eb, at\u00ebher\u00eb \u2013 \u00e7far\u00eb?<\/p>\n<p>P\u00ebrgjigjja p\u00ebr k\u00ebt\u00eb pyetje \u00ebsht\u00eb disi befasuese: nj\u00eb klaster CA nuk mund t\u00eb ndahet.<br \/>\n\u00c7far\u00eb \u00ebsht\u00eb ky klaster q\u00eb nuk mund t\u00eb ndahet?<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\nNj\u00eb atribut i domosdosh\u00ebm i k\u00ebtij klasteri \u00ebsht\u00eb sistemi i p\u00ebrbashk\u00ebt i ruajtjes s\u00eb t\u00eb dh\u00ebnave. N\u00eb shumic\u00ebn d\u00ebrrmuese t\u00eb rasteve, kjo do t\u00eb thot\u00eb lidhje p\u00ebrmes SAN, e cila e kufizon p\u00ebrdorimin e zgjidhjeve CA nga nd\u00ebrmarrjet e m\u00ebdha q\u00eb jan\u00eb t\u00eb afta t\u00eb mbajn\u00eb nj\u00eb infrastruktur\u00eb SAN. P\u00ebr t\u00eb siguruar q\u00eb disa <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/sq\/server\/\"   title=\"server\u00ebve\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"1512\">server\u00ebve<\/a> mund t\u00eb punojn\u00eb me t\u00eb nj\u00ebjtat t\u00eb dh\u00ebna, nevojitet nj\u00eb sistem skedar\u00ebsh klasteri. T\u00eb tilla sisteme skedar\u00ebsh jan\u00eb n\u00eb portofolin e HPE (CFS), Veritas (VxCFS) dhe IBM (GPFS). <\/p>\n<h4>Oracle RAC<\/h4>\n<p>\nOpsioni Real Application Cluster u shfaq p\u00ebr her\u00eb t\u00eb par\u00eb n\u00eb vitin 2001 me publikimin e Oracle 9i. N\u00eb nj\u00eb klaster t\u00eb till\u00eb, disa instanca <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/sq\/server\/dts-los-angeles\/\"   title=\"serverit\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"3642\">serverit<\/a> punojn\u00eb me t\u00eb nj\u00ebjt\u00ebn baz\u00eb t\u00eb dh\u00ebnash.<br \/>\nOracle mund t\u00eb punoj\u00eb si me nj\u00eb sistem skedar\u00ebsh klasteri, ashtu edhe me zgjidhjen e vet \u2013 ASM, Automatic Storage Management.<\/p>\n<p>\u00c7do instanc\u00eb mban nj\u00eb regjist\u00ebr t\u00eb saj. Transaksioni ekzekutohet dhe regjistrohet nga nj\u00eb instanc\u00eb. N\u00eb rast d\u00ebshtimi t\u00eb instanc\u00ebs, nj\u00eb nga nyjet e mbijetuara t\u00eb klasterit (instancave) lexon regjistrin e saj dhe rikthen t\u00eb dh\u00ebnat e humbura \u2013 p\u00ebrmes k\u00ebsaj sigurohet disponueshm\u00ebria.<\/p>\n<p>T\u00eb gjitha instancat mb\u00ebshtesin nj\u00eb cache t\u00eb vetin, dhe t\u00eb nj\u00ebjtat faqe (blloqe) mund t\u00eb jen\u00eb n\u00eb t\u00eb nj\u00ebjt\u00ebn koh\u00eb n\u00eb cache t\u00eb disa instancave. M\u00eb tej, n\u00ebse nj\u00eb instanc\u00eb ka nevoj\u00eb p\u00ebr nj\u00eb faqe dhe ajo ndodhet n\u00eb cache-n e nj\u00eb instanc\u00eb tjet\u00ebr, ajo mund ta marr\u00eb nga \"fqinj\" me mekanizmin e bashk\u00ebveprimit t\u00eb caches, n\u00eb vend q\u00eb ta lexoj\u00eb nga disku.<\/p>\n<p><img decoding=\"async\" alt=\"DB t\u00eb shp\u00ebrndara p\u00ebr sip\u00ebrmarrje\" src=\"\/wp-content\/uploads\/2020\/07\/917cb1bfcc2c47ccf0dbb2f1e34ac921.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nPor \u00e7far\u00eb do t\u00eb ndodh\u00eb n\u00ebse nj\u00ebra nga instancat ka nevoj\u00eb t\u00eb ndryshoj\u00eb t\u00eb dh\u00ebnat?<\/p>\n<p>Karakteristika e Oracle \u00ebsht\u00eb se nuk ka nj\u00eb sh\u00ebrbim t\u00eb dedikuar p\u00ebr bllokimin: n\u00ebse serveri d\u00ebshiron t\u00eb bllokoj\u00eb nj\u00eb rresht, at\u00ebher\u00eb sh\u00ebnimi p\u00ebr bllokimin vendoset direkt n\u00eb at\u00eb faqe t\u00eb memories ku ndodhet rreshti i bllokuar. Fal\u00eb k\u00ebtij qasje, Oracle \u00ebsht\u00eb kampion n\u00eb performanc\u00eb nd\u00ebrmjet bazave t\u00eb dh\u00ebnash monolitike: sh\u00ebrbimi i bllokimit nuk b\u00ebhet kurr\u00eb ngushtic\u00eb. Por n\u00eb nj\u00eb konfigurim klaster, nj\u00eb arkitektur\u00eb e till\u00eb mund t\u00eb \u00e7oj\u00eb n\u00eb shk\u00ebmbim intensiv rrjeti dhe bllokime t\u00eb nd\u00ebrsjella.<\/p>\n<p>Sapo qe regjistrimi bllokohet, instanca njofton t\u00eb gjitha instancat e tjera se faqa, n\u00eb t\u00eb cil\u00ebn ruhet ky regjistrim, \u00ebsht\u00eb kapur n\u00eb modin monopol. N\u00ebse nj\u00eb instanc\u00eb tjet\u00ebr ka nevoj\u00eb t\u00eb ndryshoj\u00eb regjistrimin n\u00eb t\u00eb nj\u00ebjt\u00ebn faqe, duhet t\u00eb pres\u00eb deri sa ndryshimet n\u00eb faqe t\u00eb regjistrohen, dmth. informacioni mbi ndryshimin nuk \u00ebsht\u00eb regjistruar n\u00eb regjistrin n\u00eb disk (n\u00eb t\u00eb nj\u00ebjt\u00ebn koh\u00eb, transaksioni mund t\u00eb vazhdoj\u00eb). Mund t\u00eb ndodh\u00eb q\u00eb faqja t\u00eb ndryshohet n\u00eb m\u00ebnyr\u00eb t\u00eb renditur nga disa instanca, dhe at\u00ebher\u00eb gjat\u00eb regjistrimit t\u00eb faqes n\u00eb disk do t\u00eb duhet t\u00eb p\u00ebrcaktohet se kujt i p\u00ebrket versioni aktual i k\u00ebsaj faqeje.<\/p>\n<p>Rivendosja e rast\u00ebsishme e t\u00eb nj\u00ebjtave faqe p\u00ebrmes nyjeve t\u00eb ndryshme RAC \u00e7on n\u00eb nj\u00eb r\u00ebnie t\u00eb ndjeshme t\u00eb performanc\u00ebs s\u00eb baz\u00ebs s\u00eb t\u00eb dh\u00ebnave - deri n\u00eb pik\u00ebn q\u00eb performanca e klasterit mund t\u00eb jet\u00eb m\u00eb e ul\u00ebt se ajo e nj\u00eb instance t\u00eb vetme.<\/p>\n<p>P\u00ebrdorimi i duhur i Oracle RAC \u2013 ndarja fizike e t\u00eb dh\u00ebnave (p.sh., p\u00ebrmes mekanizmit t\u00eb tabelave t\u00eb ndara) dhe qasja ndaj \u00e7do grupi seksionesh p\u00ebrmes nj\u00eb nyjeje t\u00eb dedikuar. Q\u00ebllimi kryesor i RAC nuk \u00ebsht\u00eb shkall\u00ebzimi horizontal, por sigurimi i q\u00ebndrueshm\u00ebris\u00eb ndaj d\u00ebshtimeve.<\/p>\n<p>N\u00ebse nj\u00eb nyje pushon s\u00eb p\u00ebrgjiguri n\u00eb heartbeat, nyja q\u00eb e zbulon k\u00ebt\u00eb e para, nis procedur\u00ebn e votimit n\u00eb disk. N\u00ebse edhe k\u00ebtu nyja e humbur nuk sh\u00ebnohet, nj\u00eb nga nyjet merr p\u00ebrsip\u00ebr detyrat p\u00ebr rikthimin e t\u00eb dh\u00ebnave:<\/p>\n<ul>\n<li>\u00abngrin\u00bb t\u00eb gjitha faqet q\u00eb ishin n\u00eb cache t\u00eb nyjes s\u00eb humbur;<\/li>\n<li>lexon journalat (redo) e nyjes s\u00eb humbur dhe p\u00ebrs\u00ebrit ndryshimet e regjistruara n\u00eb k\u00ebto journal, duke kontrolluar gjithashtu n\u00ebse ndonj\u00eb nyje tjet\u00ebr ka versione m\u00eb t\u00eb reja t\u00eb faqeve t\u00eb ndryshuara;<\/li>\n<li>rrokullisi transaksionet e pap\u00ebrfunduara.<\/li>\n<\/ul>\n<p>\nP\u00ebr t\u00eb leht\u00ebsuar kalimin nd\u00ebrmjet nyjeve, Oracle ka konceptin e sh\u00ebrbimit \u2013 nj\u00eb ekzemplar virtual. Ekzemplari mund t\u00eb sh\u00ebrbej\u00eb disa sh\u00ebrbime, nd\u00ebrsa sh\u00ebrbimi mund t\u00eb jet\u00eb n\u00eb l\u00ebvizje nd\u00ebrmjet nyjeve. Nj\u00eb ekzemplar aplikacioni q\u00eb sh\u00ebrben nj\u00eb pjes\u00eb t\u00eb caktuar t\u00eb baz\u00ebs (p.sh., nj\u00eb grup klient\u00ebsh) punon me nj\u00eb sh\u00ebrbim, dhe sh\u00ebrbimi, i cili \u00ebsht\u00eb p\u00ebrgjegj\u00ebs p\u00ebr k\u00ebt\u00eb pjes\u00eb t\u00eb baz\u00ebs, kalon n\u00eb nj\u00eb nyje tjet\u00ebr kur nj\u00eb nyje d\u00ebshton.<\/p>\n<h4>IBM Pure Data Systems for Transactions<\/h4>\n<p>\nZgjidhja klasterike p\u00ebr DBMS erdhi n\u00eb portofolin e Gigantit Blu n\u00eb vitin 2009. Ideologjikisht ajo \u00ebsht\u00eb pasardh\u00ebse e klasterit Parallel Sysplex, e nd\u00ebrtuar mbi pajisje \"t\u00eb zakonshme\". N\u00eb vitin 2009 doli produkti DB2 pureScale, q\u00eb p\u00ebrfaq\u00ebson nj\u00eb grup software, nd\u00ebrsa n\u00eb vitin 2012 IBM ofron nj\u00eb paket\u00eb software-hardware (appliance) me emrin Pure Data Systems for Transactions. Mos e ngat\u00ebrroni at\u00eb me Pure Data Systems for Analytics, e cila nuk \u00ebsht\u00eb gj\u00eb tjet\u00ebr ve\u00e7se e rinovuar Netezza.<\/p>\n<p>Arkitektura pureScale p\u00ebrshtatet n\u00eb nj\u00eb shikim t\u00eb par\u00eb me Oracle RAC: ashtu si disa nyje jan\u00eb lidhur me nj\u00eb sistem t\u00eb p\u00ebrbashk\u00ebt t\u00eb ruajtjes s\u00eb t\u00eb dh\u00ebnave, dhe n\u00eb \u00e7do nyje funksionon nj\u00eb instanc\u00eb e vetme e DBMS me hap\u00ebsira t\u00eb saj dhe regjistra transaksionesh. Por, p\u00ebr dallim nga Oracle, n\u00eb DB2 ekziston nj\u00eb sh\u00ebrbim i dedikuar bllokimi, i paraqitur nga nj\u00eb grup procesesh db2LLM*. N\u00eb konfigurimin klaster, ky sh\u00ebrbim Transferohet n\u00eb nj\u00eb nyje t\u00eb ve\u00e7ant\u00eb, e cila n\u00eb Parallel Sysplex quhet facility nj\u00eb lidhjeje (CF), dhe n\u00eb Pure Data \u2013 PowerHA.<\/p>\n<p>PowerHA ofron sh\u00ebrbimet e m\u00ebposhtme:<\/p>\n<ul>\n<li>menaxheri i bllokimeve;<\/li>\n<li>kash global;<\/li>\n<li>zona e komunikimeve nd\u00ebr-proces.<\/li>\n<\/ul>\n<p>\nP\u00ebr transferimin e t\u00eb dh\u00ebnave nga PowerHA n\u00eb nyjet e DB dhe mbrapsht p\u00ebrdoret qasja e larg\u00ebt n\u00eb memorje, k\u00ebshtu q\u00eb nd\u00ebrkonnekti i klasterit duhet t\u00eb mb\u00ebshtes\u00eb protokollin RDMA. PureScale mund t\u00eb p\u00ebrdor\u00eb si Infiniband ashtu edhe RDMA mbi Ethernet.<\/p>\n<p><img decoding=\"async\" alt=\"DB t\u00eb shp\u00ebrndara p\u00ebr sip\u00ebrmarrje\" src=\"\/wp-content\/uploads\/2020\/07\/7757acd68445dac4a9f378d5813e663f.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nN\u00ebse nyja ka nevoj\u00eb p\u00ebr nj\u00eb faqe, dhe kjo faqe nuk \u00ebsht\u00eb n\u00eb kash, nyja k\u00ebrkon faqen n\u00eb kashin global, dhe vet\u00ebm n\u00ebse as aty nuk ndodhet, e lexon nga disku. Ndryshe nga Oracle, k\u00ebrkesa shkon vet\u00ebm n\u00eb PowerHA, dhe jo n\u00eb nyjet ngjitur.<\/p>\n<p>N\u00eb qoft\u00eb se nj\u00eb instanc\u00eb do t\u00eb nd\u00ebrronte nj\u00eb rresht, ajo e bllokon at\u00eb n\u00eb m\u00ebnyr\u00eb ekskluzive dhe faqen ku ndodhet rreshti \u2013 n\u00eb m\u00ebnyr\u00eb t\u00eb ndar\u00eb. T\u00eb gjitha bllokimet regjistrohen n\u00eb menaxherin global t\u00eb bllokimeve. Kur transaksioni p\u00ebrfundon, nodi d\u00ebrgon nj\u00eb mesazh menaxherit t\u00eb bllokimeve, i cili kopjon faqen e ndryshuar n\u00eb cache-n global, heq bllokimet dhe invalidon faqen e ndryshuar n\u00eb cache-t e nod\u00ebve t\u00eb tjer\u00eb.<\/p>\n<p>N\u00eb qoft\u00eb se faqja n\u00eb t\u00eb cil\u00ebn ndodhet rreshti i ndryshuar tashm\u00eb \u00ebsht\u00eb e bllokuar, menaxheri i bllokimeve do t\u00eb lexoj\u00eb faqen e ndryshuar nga memoria e nodit q\u00eb ka b\u00ebr\u00eb ndryshimet, do t\u00eb heq\u00eb bllokimin, do t\u00eb invalidon faqen e ndryshuar n\u00eb cache-t e nod\u00ebve t\u00eb tjer\u00eb dhe do t'i jap\u00eb bllokimin e faqes nodit q\u00eb e ka k\u00ebrkuar at\u00eb.<\/p>\n<p>Faqet \u00abt\u00eb ndotura\u00bb, dometh\u00ebn\u00eb t\u00eb ndryshuara, mund t\u00eb shkruhen n\u00eb disk si nga nj\u00eb nod i zakonsh\u00ebm, ashtu edhe nga PowerHA (castout).<\/p>\n<p>N\u00eb rast t\u00eb d\u00ebshtimit t\u00eb nj\u00eb nga nyjeve, riparimi i pureScale \u00ebsht\u00eb i kufizuar vet\u00ebm n\u00eb ato transaksione q\u00eb n\u00eb momentin e d\u00ebshtimit ende nuk ishin p\u00ebrfunduar: faqet e ndryshuara nga kjo nyje n\u00eb transaksionet e p\u00ebrfunduara ndodhen n\u00eb \u043a\u0435\u0448in global n\u00eb PowerHA. Nyja rilansohet n\u00eb nj\u00eb konfigurim t\u00eb reduktuar n\u00eb nj\u00eb nga server\u00ebt e klasterit, rregullon transaksionet e pap\u00ebrfunduara dhe \u00e7liron bllokimet.<\/p>\n<p>PowerHA funksionon n\u00eb dy servera, dhe nyja kryesore n\u00eb m\u00ebnyr\u00eb sinkrone riplikon gjendjen e saj. N\u00eb rast d\u00ebshtimi t\u00eb nyj\u00ebs kryesore, klasteri PowerHA vazhdon t\u00eb punoj\u00eb me nyj\u00ebn rezerv\u00eb.<br \/>\nSigurisht, n\u00ebse qasemi n\u00eb setin e t\u00eb dh\u00ebnave p\u00ebrmes nj\u00eb nyje, performanca totale e klasterit do t\u00eb jet\u00eb m\u00eb e lart\u00eb. PureScale madje mund t\u00eb v\u00ebrej\u00eb se nj\u00eb zon\u00eb e caktuar e t\u00eb dh\u00ebnave po p\u00ebrpuntohet nga nj\u00eb nyje, dhe at\u00ebher\u00eb t\u00eb gjitha bllokimet q\u00eb i p\u00ebrkasin k\u00ebsaj zone do t\u00eb p\u00ebrpunohen lokal nga nyja pa komunikim me PowerHA. Por sapo aplikacioni t\u00eb p\u00ebrpiqet t\u00eb qaset n\u00eb k\u00ebto t\u00eb dh\u00ebna p\u00ebrmes nj\u00eb nyje tjet\u00ebr, p\u00ebrpunimi qendror i bllokimeve do t\u00eb rifilloj\u00eb.<\/p>\n<p>Testet e brendshme t\u00eb IBM mbi ngarkes\u00ebn 90% lexim dhe 10% shkruaj, e cila \u00ebsht\u00eb shum\u00eb e ngjashme me ngarkesat reale t\u00eb industris\u00eb, tregojn\u00eb nj\u00eb shkall\u00ebzim pothuajse linear deri n\u00eb 128 node. Kushtet e testimit, fatkeq\u00ebsisht, nuk zbulohen.<\/p>\n<h4>HPE NonStop SQL<\/h4>\n<p>\nHewlett-Packard Enterprise gjithashtu ofron nj\u00eb platform\u00eb t\u00eb saj t\u00eb lart\u00eb disponueshm\u00ebrie. Kjo \u00ebsht\u00eb platforma NonStop, e cila u lan\u00e7ua n\u00eb treg n\u00eb vitin 1976 nga kompani Tandem Computers. N\u00eb vitin 1997, kompania u ble nga Compaq, e cila, nga ana e saj, u bashkua me Hewlett-Packard n\u00eb vitin 2002.<\/p>\n<p>NonStop p\u00ebrdoret p\u00ebr nd\u00ebrtimin e aplikacioneve kritike \u2013 p\u00ebr shembull, HLR ose procesimin e kartave bankare. Platforma ofrohet si nj\u00eb kompleks softuerik dhe harduerik (appliance), q\u00eb p\u00ebrfshin node llogarit\u00ebse, nj\u00eb sistem ruajtjeje dhe pajisje komunikimi. Rrjeti ServerNet (n\u00eb sistemet moderne \u2013 Infiniband) sh\u00ebrben si p\u00ebr shk\u00ebmbimin midis node-ve ashtu edhe p\u00ebr qasje n\u00eb sistemin e ruajtjes.<\/p>\n<p>N\u00eb versionet e hershme t\u00eb sistemit, jan\u00eb p\u00ebrdorur procesor\u00eb proprietar\u00eb, t\u00eb cil\u00ebt ishin t\u00eb sinkronizuar me nj\u00ebri-tjetrin: t\u00eb gjitha operacionet realizoheshin n\u00eb m\u00ebnyr\u00eb sinkrone nga disa procesor\u00eb, dhe sapo nj\u00eb nga procesor\u00ebt gabonte, ai shk\u00ebputej, nd\u00ebrsa tjetri vazhdonte pun\u00ebn. M\u00eb von\u00eb, sistemi kaloi n\u00eb procesor\u00eb standard\u00eb (fillimisht MIPS, pastaj Itanium dhe p\u00ebrfundimisht x86), dhe p\u00ebr sinkronizimin filluan t\u00eb p\u00ebrdoren mekanizma t\u00eb tjer\u00eb:<\/p>\n<ul>\n<li>mesazhet: \u00e7do proces sistemor ka nj\u00eb dyplikat-\u00abhije\u00bb, t\u00eb cilit procesi aktiv i d\u00ebrgon periodikisht mesazhe p\u00ebr gjendjen e tij; n\u00eb rast d\u00ebshtimi t\u00eb procesit kryesor, procesi hije fillon pun\u00ebn nga pika q\u00eb p\u00ebrcaktohet nga mesazhi i fundit;<\/li>\n<li>votimi: sistemi i ruajtjes s\u00eb t\u00eb dh\u00ebnave ka nj\u00eb komponent t\u00eb ve\u00e7ant\u00eb harduerik, i cili pranon disa k\u00ebrkesa identike dhe i ekzekuton vet\u00ebm n\u00ebse k\u00ebrkesat p\u00ebrputhen; n\u00eb vend t\u00eb sinkronizimit fizik, procesor\u00ebt punojn\u00eb asinkronisht, dhe rezultatet e pun\u00ebs s\u00eb tyre krahasohen vet\u00ebm n\u00eb momentet e hyrjes\/daljes.<\/li>\n<\/ul>\n<p>\nQ\u00eb nga viti 1987, n\u00eb platform\u00ebn NonStop punon nj\u00eb sistem i bazave t\u00eb t\u00eb dh\u00ebnave relacional - fillimisht SQL\/MP, dhe m\u00eb von\u00eb - SQL\/MX.<\/p>\n<p>E gjith\u00eb baza e t\u00eb dh\u00ebnave ndahet n\u00eb pjes\u00eb, dhe p\u00ebr secil\u00ebn pjes\u00eb p\u00ebrgjigjet procesi Data Access Manager (DAM). Ai siguron regjistrimin e t\u00eb dh\u00ebnave, ruajtjen n\u00eb memorie dhe mekanizmin e bllokimeve. P\u00ebrpunimi i t\u00eb dh\u00ebnave b\u00ebhet nga proceset ekzekutues (Executor Server Process), t\u00eb cil\u00ebt punojn\u00eb n\u00eb t\u00eb nj\u00ebjtat nyje si menaxher\u00ebt p\u00ebrkat\u00ebs t\u00eb t\u00eb dh\u00ebnave. Planifikuesi SQL\/MX ndan detyrat midis ekzekutuesve dhe kombinon rezultatet. Kur \u00ebsht\u00eb e nevojshme t\u00eb b\u00ebhen ndryshime t\u00eb r\u00ebna dakord, p\u00ebrdoret protokolli i bllokimit dyt\u00eb, i siguruar nga biblioteka TMF (Transaction Management Facility).<\/p>\n<p><img decoding=\"async\" alt=\"DB t\u00eb shp\u00ebrndara p\u00ebr sip\u00ebrmarrje\" src=\"\/wp-content\/uploads\/2020\/07\/00e9473dd95a78c409dd5283d299fe96.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nNonStop SQL ka aft\u00ebsin\u00eb p\u00ebr t\u00eb priorizuar proceset n\u00eb m\u00ebnyr\u00eb q\u00eb k\u00ebrkesat e gjata analitike t\u00eb mos pengojn\u00eb ekzekutimin e transaksioneve. Megjithat\u00eb, q\u00ebllimi i saj \u00ebsht\u00eb p\u00ebrpunimi i transaksioneve t\u00eb shkurtra, dhe jo analitika. Zhvilluesi garanton disponueshm\u00ebrin\u00eb e klasterit NonStop n\u00eb nivelin pes\u00eb \u00abn\u00ebnt\u00eb\u00bb, q\u00eb do t\u00eb thot\u00eb se koha e pap\u00ebrshkruar p\u00ebrb\u00ebn vet\u00ebm 5 minuta n\u00eb vit.<\/p>\n<h4>SAP HANA<\/h4>\n<p>\nRirajti i par\u00eb stabil i DBMS HANA (1.0) u lan\u00e7ua n\u00eb n\u00ebntor 2010, dhe paketa SAP ERP kaloi n\u00eb HANA q\u00eb nga maji 2013. Platforma \u00ebsht\u00eb e bazuar n\u00eb teknologjit\u00eb e blera: TREX Search Engine (k\u00ebrkim n\u00eb magazin\u00ebn me kolona), DBMS P*TIME dhe MAX DB.<\/p>\n<p>Fjala \u00abHANA\u00bb \u00ebsht\u00eb nj\u00eb akronim p\u00ebr High performance ANalytical Appliance. Ky DBMS ofrohet n\u00eb form\u00ebn e kodit, i cili mund t\u00eb punoj\u00eb n\u00eb server\u00eb x86 t\u00eb \u00e7do lloji, megjithat\u00eb instalimet industriale lejojn\u00eb vet\u00ebm pajisje q\u00eb kan\u00eb kaluar certifikimin. Jan\u00eb n\u00eb dispozicion zgjidhje nga HP, Lenovo, Cisco, Dell, Fujitsu, Hitachi, NEC. Disa konfiguracione t\u00eb Lenovo lejojn\u00eb madje operimin pa SAN - roli i ruajtjes s\u00eb p\u00ebrbashk\u00ebt luhet nga klasteri GPFS n\u00eb disk\u00ebt lokal\u00eb.<\/p>\n<p>N\u00eb kund\u00ebrshtim me platformat e p\u00ebrmendura m\u00eb sip\u00ebr, HANA \u00ebsht\u00eb nj\u00eb DBMS n\u00eb memory, q\u00eb do t\u00eb thot\u00eb se pamja primare e t\u00eb dh\u00ebnave ruhet n\u00eb kujtes\u00ebn operative, nd\u00ebrsa n\u00eb disk regjistrohen vet\u00ebm ditar\u00ebt dhe p\u00ebrkoh\u00ebsit\u00eb - p\u00ebr rikuperim n\u00eb rast aksidenti.<\/p>\n<p><img decoding=\"async\" alt=\"DB t\u00eb shp\u00ebrndara p\u00ebr sip\u00ebrmarrje\" src=\"\/wp-content\/uploads\/2020\/07\/f64194ca6de13e1a93f7190dc38ad2d7.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n\u00c7do nyje e klasterit HANA \u00ebsht\u00eb p\u00ebrgjegj\u00ebse p\u00ebr pjes\u00ebn e saj t\u00eb t\u00eb dh\u00ebnave, nd\u00ebrsa harta e t\u00eb dh\u00ebnave ruhet n\u00eb nj\u00eb komponent t\u00eb ve\u00e7ant\u00eb - Serverin e Emrave, i vendosur n\u00eb nyjen koordinatore. T\u00eb dh\u00ebnat nd\u00ebrmjet nyjeve nuk dublikohen. Informacioni mbi bllokimet gjithashtu ruhet n\u00eb \u00e7do nyje, por n\u00eb sistem ka nj\u00eb detektor global t\u00eb bllokimeve t\u00eb nd\u00ebrsjella.<\/p>\n<p>Klienti HANA, kur lidhet me klasterin, ngarkon topologjin\u00eb e tij dhe m\u00eb pas mund t\u00eb drejtohet drejtp\u00ebrdrejt te \u00e7do nyje n\u00eb var\u00ebsi t\u00eb t\u00eb dh\u00ebnave q\u00eb i nevojiten. N\u00ebse transaksioni p\u00ebrfshin t\u00eb dh\u00ebnat e nj\u00eb nyjeje t\u00eb vetme, ai mund t\u00eb ekzekutohet lokalisht nga kjo nyje, por n\u00ebse ndryshohen t\u00eb dh\u00ebnat e disa nyjeve, nyja-iniciatore i drejtohet nyj\u00ebs-koordinatori, e cila hap dhe koordinon transaksionin e shp\u00ebrndar\u00eb, duke e regjistruar at\u00eb p\u00ebrmes nj\u00eb protokolli t\u00eb optimizuar t\u00eb regjistrimit n\u00eb dy faza.<\/p>\n<p>Nyja-koordinatore \u00ebsht\u00eb e dyfisht\u00eb, prandaj n\u00eb rast se koordinatori d\u00ebshton, menj\u00ebher\u00eb aktivizohet nyja rezerv\u00eb. N\u00ebse d\u00ebshtin\u00eb nj\u00eb nyje me t\u00eb dh\u00ebna, m\u00ebnyra e vetme p\u00ebr t\u00eb aksesuar t\u00eb dh\u00ebnat e saj \u00ebsht\u00eb t\u00eb rindizni nyj\u00ebn. Si rregull, n\u00eb klasteret HANA mbahet nj\u00eb server rezerv\u00eb (spare), n\u00eb m\u00ebnyr\u00eb q\u00eb t\u00eb rikthehet sa m\u00eb shpejt nyja e humbur.<br \/>\n<br \/>Burimi: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/512298\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>CAP-\u0442\u0435\u043e\u0440\u0435\u043c\u0430 \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043a\u0440\u0430\u0435\u0443\u0433\u043e\u043b\u044c\u043d\u044b\u043c \u043a\u0430\u043c\u043d\u0435\u043c \u0442\u0435\u043e\u0440\u0438\u0438 \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u044b\u0445 \u0441\u0438\u0441\u0442\u0435\u043c. \u041a\u043e\u043d\u0435\u0447\u043d\u043e, \u0441\u043f\u043e\u0440\u044b \u0432\u043e\u043a\u0440\u0443\u0433 \u043d\u0435\u0451 \u043d\u0435 \u0443\u0442\u0438\u0445\u0430\u044e\u0442: \u0438 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u0438\u044f \u0432 \u043d\u0435\u0439 \u043d\u0435 \u043a\u0430\u043d\u043e\u043d\u0438\u0447\u0435\u0441\u043a\u0438\u0435, \u0438 \u0441\u0442\u0440\u043e\u0433\u043e\u0433\u043e \u0434\u043e\u043a\u0430\u0437\u0430\u0442\u0435\u043b\u044c\u0441\u0442\u0432\u0430 \u043d\u0435\u0442\u2026 \u0422\u0435\u043c \u043d\u0435 \u043c\u0435\u043d\u0435\u0435, \u0442\u0432\u0451\u0440\u0434\u043e \u0441\u0442\u043e\u044f \u043d\u0430 \u043f\u043e\u0437\u0438\u0446\u0438\u044f\u0445 \u0431\u044b\u0442\u043e\u0432\u043e\u0433\u043e \u0437\u0434\u0440\u0430\u0432\u043e\u0433\u043e \u0441\u043c\u044b\u0441\u043b\u0430&trade;, \u043c\u044b \u0438\u043d\u0442\u0443\u0438\u0442\u0438\u0432\u043d\u043e \u043f\u043e\u043d\u0438\u043c\u0430\u0435\u043c, \u0447\u0442\u043e \u0442\u0435\u043e\u0440\u0435\u043c\u0430 \u0432\u0435\u0440\u043d\u0430. \u0415\u0434\u0438\u043d\u0441\u0442\u0432\u0435\u043d\u043d\u043e\u0435, \u0447\u0442\u043e \u043d\u0435 \u043e\u0447\u0435\u0432\u0438\u0434\u043d\u043e, \u0442\u0430\u043a \u044d\u0442\u043e \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u0431\u0443\u043a\u0432\u044b \u00abP\u00bb. \u041a\u043e\u0433\u0434\u0430 \u043a\u043b\u0430\u0441\u0442\u0435\u0440 \u0440\u0430\u0437\u0434\u0435\u043b\u0438\u043b\u0441\u044f, \u043e\u043d \u0440\u0435\u0448\u0430\u0435\u0442 \u2013 \u0442\u043e [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":89873,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-89872","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"CAP-\u0442\u0435\u043e\u0440\u0435\u043c\u0430 \u044f\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043a\u0440\u0430\u0435\u0443\u0433\u043e\u043b\u044c\u043d\u044b\u043c \u043a\u0430\u043c\u043d\u0435\u043c \u0442\u0435\u043e\u0440\u0438\u0438 \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u044b\u0445 \u0441\u0438\u0441\u0442\u0435\u043c. \u041a\u043e\u043d\u0435\u0447\u043d\u043e, \u0441\u043f\u043e\u0440\u044b \u0432\u043e\u043a\u0440\u0443\u0433 \u043d\u0435\u0451 \u043d\u0435 \u0443\u0442\u0438\u0445\u0430\u044e\u0442: \u0438 \u043e\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u0438\u044f \u0432 \u043d\u0435\u0439 \u043d\u0435 \u043a\u0430\u043d\u043e\u043d\u0438\u0447\u0435\u0441\u043a\u0438\u0435, \u0438 \u0441\u0442\u0440\u043e\u0433\u043e\u0433\u043e \u0434\u043e\u043a\u0430\u0437\u0430\u0442\u0435\u043b\u044c\u0441\u0442\u0432\u0430 \u043d\u0435\u0442\u2026 \u0422\u0435\u043c \u043d\u0435 \u043c\u0435\u043d\u0435\u0435, \u0442\u0432\u0451\u0440\u0434\u043e \u0441\u0442\u043e\u044f \u043d\u0430 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