Matatu Cache Layers Pakati Sarudzo uye Disk

Kana application yako ikabatidza SELECT statement, mubvunzo iwoyo haumbobata dhisiki rinotenderera kana flash flash storage — rinopfuura nemuzvikamu zvitatu zvakasiyana zvecache zvinotarisa chinyararire kana mhinduro yako ichisvika mumamicroseconds kana mamilliseconds. Kunzwisisa maseru aya ndiwo mutsauko uripo pakati pechikuva chebhizinesi chinoyera zvisingaite uye icho chinosungirira pasi pemutoro chaiwo wepasirese.

Chii Chinoitika Panguva YeKUSARUDZA Mubvunzo Ukasiya Chikumbiro Chako?

 Injini yedatabase inobata chikumbiro chero I / O isati yaitika, ichiisa iyo SQL muchirongwa chekuuraya chemukati uye nekukasira kubvunza mutsara wayo wekutanga wekudzivirira: iyo yemubvunzo cache. Kana mubvunzo wakafanana une maparamendi akafanana wakaitwa nguva pfupi yadarika, injini inogona kudzosa mhinduro yakachengetwa isina kubata peji imwe yedata. Izvi dzimwe nguva zvinodaidzwa kunzi query cachekana kuti cache yemhedzisiro, uye pakuverenga-kwakanyanya, kunyora pasi-kuremerwa kwemabasa - seanalytics dashboards nemamodule ekureporter — zvinogona kubvisa ruzhinji rwe disk kuverenga zvachose.

Muono wakakosha apa ndewekuti iyo cache yemubvunzo inotarisisa zvakanyanya kune data mutations. Chero INSERT, UPDATE, kana DELETE patafura iri pasi petafura inokonesa zvakawanikwa zvakachengetwa. Ndosaka kunyora-inorema transactional masisitimu achiwanzodzima query yemubvunzo zvachose uye vachivimba neakadzama layer pane kudaro.

Chii chinonzi Buffer Pool uye Nei Zvichinyanya Kupfuura Zvaunofunga?

Yechipiri cache layer - uye zvine nharo inonyanya kukosha mukugadzira masisitimu - ndiyo buffer pool (inonzi iyo yakagovaniswa buffer muPostgreSQL, iyo InnoDB buffer dziva muMySQL). Iyi inzvimbo ye RAM iyo injini yedatabase inoshandisa kubata ichangoburwa data mapeji. Kana mubvunzo usingakwanise kupihwa kubva pane zvawanikwa, injini inotarisa kana mapeji edata anodiwa atogara mubuffer pool isati yaburitsa chero dhisiki rakaverengwa.

Dziva rebuffer rinoshanda nemusimboti wenzvimbo yenguva uye yenzvimbo: data rakasvikwa nguva pfupi yadarika rinogona kuwanikwa zvakare, uye data rakachengetwa pedyo nedata rinowanikwa rinogona kuwanikwa munguva pfupi. Database administrator tune buffer dziva saizi seimwe yepamusoro-yemwero yekumisikidzwa sarudzo dzavanoita. Dziva rebuffer iro ridiki diki rinokonzeresa kudzingwa kwepeji nguva dzose, kuchigadzira chiitiko chinonzi thrashing, apo sisitimu inopedza nguva yakawanda ichigadzirisa zvakapotsa pane kubvunza mibvunzo.

Key Insight: Mumabasa akawanda eOLTP, dziva rebuffer rakanyatsokwana zvinoreva kuti 95–99% yedata yese yakaverengwa inopihwa kubva kuRAM. Iyo inoshanda seti - iyo subset yedata rako iyo mibvunzo inobata kazhinji - kazhinji idiki zvakanyanya pane yakazara dhatabhesi saizi. Kuyera dziva rako rebuffer kuti rikwane seti yako yekushanda, kwete dhatabheti yako yese, ndicho chiito chepamusoro chekudzorera chaunogona kutora.

Cache YeOperating System Inozadza Sei Mukaha Pakati PeRAM neDisk?

Kunyangwe iyo dhatabhesi yega buffer pool ikapotsa, mubvunzo hausati waitirwa kuti dhisiki rechokwadi riverengeke. The operating system inochengetedza peji cache (inonziwo filesystem cache), nharaunda ye kernel-inotungamirirwa RAM iyo mabhafa anoverenga uye anonyora kuvhara zvishandiso. Kana injini yedatabase ichikumbira peji risipo padziva rayo rekuchengetedza, OS kernel inotarisa cache yepeji yayo isati yapa murairo weI/O wenyama kumubati wekuchengeta.

Iyi yechitatu layer haionekwe kune vanogadzira maapplication asi yakakosha pane masisitimu uko dhatabhesi buffer pool iri pasi-inopihwa. Iyo OS peji cache inogovaniswa kune ese maitiro, saka inokwikwidza neako application server, webhu server, uye chero imwe software inomhanya pane imwecheteyo host. Pamaseva akazvitsaurira edatabase, makwikwi aya mashoma, uye OS cache inopa inonzwisisika yechipiri-mukana buffer. Pamahosi akagovaniswa kana macontainer ane ndangariro dzakasimba, iyo OS cache inogara idiki kwazvo kuti ibatsire.

Ndeipi Cache Layer Ine basa reKunyanya Kuita Kunohwina Mukuita?

Mumasisitimu ekugadzira epasirese, dziva rebuffer rinotonga zvinobuda nemuganho wakafara. Hechino chikonzero nei imwe neimwe layer ichibatsira zvakasiyana pane ese ekushandisa kesi:

• Cache yemhedzisiro yemubvunzo: Kubatsirwa kwakanyanya pakuverenga-zvinorema, zvakanyanya static datasets - mishumo yekushuma, madhibhodhi akachengetwa, mapeji ezvinyorwa zveveruzhinji. Hazvibatsiri pamatafura anorema.
• Database buffer pool: The universal workhorse. Yese yekugadzira dhatabhesi server inofanirwa kutariswa pano kutanga. Inobata zvese zvisina tsarukano uye zvakatevedzana mapatani ekuwana zvakanaka.
• OS peji cache: Inopa mambure ekuchengetedza kana dziva rebuffer rikadzikira. Zvinobatsirawo zvakanyanya panguva yekuongororwa kwakatevedzana kwematafura mahombe angangoburitsa mapeji anopisa kubva padziva rebuffer.
• Storage controller cache (hardware layer): Chikamu chechina, chinowanzo furatirwa — NVMe SSDs uye RAID controller vanochengeta onboard kunyora cache nebhatiri kana capacitor backup. Izvi zvinodzivirira kusimba pasina kurega kunyora kuburikidza nekurasikirwa kwefsync latency.
• Application-layer cache (Redis, Memcached): Inogara pamusoro pedhatabhesi zvachose, ichichengeta zvabuda mubvunzo kana zvinhu zvekombuta kudzivirira kurova dhatabhesi zvachose — yakanaka kune akawanda-anoroja SaaS mapuratifomu anoshandira zviuru zvevashandisi panguva imwe chete.

Mapuratifomu eBhizinesi Anhasi Anogona Sei Kukwirisa Cache Architecture yeKuvimbika paChikero?

Kumabhizinesi anoshanda mumamodule akawanda anoshanda - CRM, manejimendi epurojekiti, e-commerce, analytics - cache architecture inotarisisa kupindurwa kwepuratifomu sezvo zvikwata zvinokura. Mapuratifomu akavakirwa pane yakanyatso layerwa cache zano anogona kushandira makumi ezviuru zvevashandisi panguva imwe chete pasina yakaenzana mutengo wezvivakwa. Chakakosha kugadzira mapeteni ekuwana data anoremekedza miganhu yecache: kuchengeta data rinopisa riri diki uye mapeteni ekuwana anogona kufanoziva, kushandisa kuverenga replicas kugovera buffer pool load, uye kuisa application-layer cache seRedis pamberi pedhatabhesi yemagumo ayo anopa data yakafanana kune vakawanda vashandisi panguva imwe chete.

Mewayz yakagadzirwa iine huzivi uhu mupfungwa. Iine mazana maviri nenomwe emamodule ebhizinesi akabatanidzwa ane simba pamusoro pevashandisi 138,000, dhata repuratifomu rakagadzirwa kuitira kuti huwandu hwakawanda hwekuverenga huchengetwe kubva kucache - kuchengetedza nguva dzekupindura nekukurumidza uye zvivakwa zvinodhura zvinofungidzirwa kuti uri kumhanya pachirongwa chekutanga chemadhora gumi nepfumbamwe kana madhora makumi mana nepfumbamwe / mwedzi tier.

Mibvunzo Inowanzo bvunzwa

Kudzima kuchengetwa kwemubvunzo kunogara kuchinatsiridza mashandiro edatabase here?

Kwete nguva dzose, asi kunyora-inorema basa rinowanzoita. Iyo cache yemubvunzo inoda chimumumu chepasirese kuchengetedza kuenderana, izvo zvinova bhodhoro pasi pemari yakawanda. MySQL 8.0 yakabvisa cache yemubvunzo zvachose nekuda kweichi chikonzero. PostgreSQL haina kumbobvira yaita yakavakirwa-mukati yemubvunzo cache, ichitsamira pane iyo buffer dziva uye application-layer caching. Kana reshiyo yako yekuverenga-kunyora yakakwira uye mivhunzo yako ichidzokororwa zvakanyanya, cache yemubvunzo inogona kuunza pundutso chaidzo - kana zvikasadaro, isa simba rekugadzirisa mudziva rebuffer.

Ndinoziva sei kana dziva rangu rekudzivirira rakakura zvakanaka?

Tarisa buffer pool yako hit ratio: chikamu chezvikumbiro zvepeji chinopihwa kubva padziva maringe neavo vanoda disk kuverenga. A hit reshiyo pazasi 95% pane OLTP basa rekuita chiratidzo chekuwedzera saizi yedziva. MuMySQL, bvunza SHOW ENGINE INNODB STATUS uye tarisa buffer pool hit rate. MuPostgreSQL, iyo pg_statio_user_tables inoona inofumura mirwi mirwi yakaverengwa kubva kudhisiki maringe nekupihwa kubva padziva rebuffer. Vavarira kuchengeta seti yako yese yekushanda — kwete yako yakazara dataset — ichigara muRAM.

Ndehupi hukama huripo pakati pecache layer uye akawanda-anoroja SaaS kuvimbika?

MuSaaS inoroja akawanda, cache layers inodzivirira matambudziko e "muvakidzani ane ruzha" apo kurema kwemutoro wemuroja kunokanganisa kushanda kwevamwe maroja ese. Tenant-aware application caching neTTL-based invalidation inochengeta munhu wese-anoroja data rinopisa muRedis, ichideredza zvakanyanya kudzvanywa kwedziva kubva kumaakaundi makuru. Kuunganidzwa kwedatabase-level yekubatanidza yakasanganiswa nedziva inodziya yebuffer inoita kuti chiitiko chekuputika kubva kune chero account hachisese mapeji akagovaniswa kubva kucache uye kukonzera latency spikes pachikuva.

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Cache layers haisi dhatabhesi trivia - ndiyo nheyo yekuvaka inoparadzanisa mapuratifomu anogara nekukurumidza pachiyero kubva kune ayo anoda kugara achidzima moto. Kana uri kuvaka kana kuita bhizinesi rinoda chikuva chakatogadziridzwa kuitira zvinhu chaizvo izvi, explore Mewayz at app.mewayz.com — 207 modules, one coherent platform, akavakwa kuti ashande zvakavimbika kubva pamushandisi wako wekutanga kusvika pazana-chiuru.