{"id":3605,"date":"2026-10-27T09:30:00","date_gmt":"2026-10-27T09:30:00","guid":{"rendered":"https:\/\/potenting.com\/da\/blog\/what-is-caching-how-it-works-and-why-it-matters\/"},"modified":"2026-10-27T09:53:39","modified_gmt":"2026-10-27T09:53:39","slug":"what-is-caching-how-it-works-and-why-it-matters-da","status":"publish","type":"post","link":"https:\/\/potenting.com\/da\/blog\/what-is-caching-how-it-works-and-why-it-matters\/","title":{"rendered":"Hvad er caching? S\u00e5dan fungerer det, og derfor er det vigtigt"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"3605\" class=\"elementor elementor-3605\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-9ef0e68 e-flex e-con-boxed e-con e-parent\" data-id=\"9ef0e68\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-d5c5c70 elementor-toc--minimized-on-tablet elementor-widget elementor-widget-table-of-contents\" data-id=\"d5c5c70\" data-element_type=\"widget\" data-e-type=\"widget\" data-settings=\"{&quot;exclude_headings_by_selector&quot;:[],&quot;no_headings_message&quot;:&quot;Der blev ikke fundet nogen overskrifter p\\u00e5 denne side.&quot;,&quot;headings_by_tags&quot;:[&quot;h2&quot;,&quot;h3&quot;,&quot;h4&quot;,&quot;h5&quot;,&quot;h6&quot;],&quot;marker_view&quot;:&quot;numbers&quot;,&quot;minimize_box&quot;:&quot;yes&quot;,&quot;minimized_on&quot;:&quot;tablet&quot;,&quot;hierarchical_view&quot;:&quot;yes&quot;,&quot;min_height&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;min_height_tablet&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]},&quot;min_height_mobile&quot;:{&quot;unit&quot;:&quot;px&quot;,&quot;size&quot;:&quot;&quot;,&quot;sizes&quot;:[]}}\" data-widget_type=\"table-of-contents.default\">\n\t\t\t\t\t\t\t\t\t<div class=\"elementor-toc__header\">\n\t\t\t\t\t\t<div class=\"elementor-toc__header-title\">\n\t\t\t\tIndholdsfortegnelse\t\t\t<\/div>\n\t\t\t\t\t\t\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--expand\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__d5c5c70\" aria-expanded=\"true\" aria-label=\"Open table of contents\"><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-chevron-down\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M207.029 381.476L12.686 187.132c-9.373-9.373-9.373-24.569 0-33.941l22.667-22.667c9.357-9.357 24.522-9.375 33.901-.04L224 284.505l154.745-154.021c9.379-9.335 24.544-9.317 33.901.04l22.667 22.667c9.373 9.373 9.373 24.569 0 33.941L240.971 381.476c-9.373 9.372-24.569 9.372-33.942 0z\"><\/path><\/svg><\/div>\n\t\t\t\t<div class=\"elementor-toc__toggle-button elementor-toc__toggle-button--collapse\" role=\"button\" tabindex=\"0\" aria-controls=\"elementor-toc__d5c5c70\" aria-expanded=\"true\" aria-label=\"Close table of contents\"><svg aria-hidden=\"true\" class=\"e-font-icon-svg e-fas-chevron-up\" viewBox=\"0 0 448 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M240.971 130.524l194.343 194.343c9.373 9.373 9.373 24.569 0 33.941l-22.667 22.667c-9.357 9.357-24.522 9.375-33.901.04L224 227.495 69.255 381.516c-9.379 9.335-24.544 9.317-33.901-.04l-22.667-22.667c-9.373-9.373-9.373-24.569 0-33.941L207.03 130.525c9.372-9.373 24.568-9.373 33.941-.001z\"><\/path><\/svg><\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<div id=\"elementor-toc__d5c5c70\" class=\"elementor-toc__body\">\n\t\t\t<div class=\"elementor-toc__spinner-container\">\n\t\t\t\t<svg class=\"elementor-toc__spinner eicon-animation-spin e-font-icon-svg e-eicon-loading\" aria-hidden=\"true\" viewBox=\"0 0 1000 1000\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M500 975V858C696 858 858 696 858 500S696 142 500 142 142 304 142 500H25C25 237 238 25 500 25S975 237 975 500 763 975 500 975Z\"><\/path><\/svg>\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-917074d e-flex e-con-boxed e-con e-parent\" data-id=\"917074d\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-21f2763 elementor-widget elementor-widget-text-editor\" data-id=\"21f2763\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Forestil dig, at en hjemmeside skal behandle alle data helt fra bunden, hver gang du bes\u00f8ger den, for at indl\u00e6se billeder, vise sider eller hente oplysninger. Det \u00f8ger ikke kun svartiderne, men l\u00e6gger ogs\u00e5 ekstra pres p\u00e5 serveren og systemets ressourcer. Det er her, caching kommer ind i billedet. Ved at gemme ofte anvendte data i hurtigere hukommelse kan caching forkorte adgangstiden til data og forbedre systemets ydeevne. Men hvordan fungerer caching, hvilke typer caching findes der, og hvilke udfordringer kan der opst\u00e5, n\u00e5r man bruger det?<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-3cda91c e-flex e-con-boxed e-con e-parent\" data-id=\"3cda91c\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-641c43c elementor-widget elementor-widget-text-editor\" data-id=\"641c43c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h2>Hvad er caching?<\/h2><p>Caching er processen, hvor ofte anvendte data gemmes i en bestemt hukommelse. Forestil dig, at du har brug for adgang til et bestemt program eller et bestemt stykke data med f\u00e5 minutters mellemrum. Da disse data bruges ofte, gemmes de et sted, der kaldes en cache, s\u00e5 de ikke skal hentes igen, hver gang du bruger dem. Der er mange grunde til at bruge caching, men en af de vigtigste er at reducere adgangstiden til data.<\/p><p>Harddiske er langsomme, og selv de hurtigste kan ikke matche hastigheden af RAM og processoren. Derfor tager det tid at hente data fra dem. Cachehukommelse er derimod anderledes, fordi det er en type h\u00f8jhastighedshukommelse. Denne type hukommelse har begr\u00e6nset kapacitet og kan kun gemme data, der bruges ofte.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-35dac7d e-flex e-con-boxed e-con e-parent\" data-id=\"35dac7d\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-6af3baa elementor-widget elementor-widget-text-editor\" data-id=\"6af3baa\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h2>Typer af caching<\/h2><p>I dette afsnit gennemg\u00e5r vi de forskellige typer caching og deres anvendelser.<\/p><ul><li><h3>Klientside-caching<\/h3>Ved denne metode gemmes data p\u00e5 klientsiden, som regel i en webbrowser. Browseren kan gemme kopier af websider og ressourcer som billeder i sin cache, s\u00e5 de kan vises ved senere bes\u00f8g uden at skulle hentes fra serveren igen. Ved for eksempel at kontrollere, hvorn\u00e5r en side sidst blev \u00e6ndret, kan browseren afg\u00f8re, om den cachede version stadig er gyldig.<\/li><li><h3>Serverside-caching<\/h3>Ved denne metode gemmes data p\u00e5 serversiden for at kunne besvare foresp\u00f8rgsler hurtigere og mindske belastningen p\u00e5 serveren og netv\u00e6rket. Et eksempel er brugen af en caching-proxyserver, som kan gemme det forespurgte indhold og levere det samme indhold til andre brugere, n\u00e5r der er behov for det. DynaCache i IBM WebSphere Application Server er et andet eksempel p\u00e5 en mekanisme til serverside-caching.<\/li><li><h3>Helsides-caching<\/h3>Ved denne metode gemmes en kopi af hele den renderede webside, s\u00e5 siden ved efterf\u00f8lgende foresp\u00f8rgsler kan leveres uden at skulle k\u00f8re alle processerne til generering af indhold igen. Denne metode er dog kun egnet, n\u00e5r sidens indhold kan caches, og \u00e6ndringer i det h\u00e5ndteres korrekt.<\/li><li><h3>Fragment-caching<\/h3>Ved denne metode caches bestemte dele af en side hver for sig i stedet for at gemme hele siden. Denne tilgang er nyttig, n\u00e5r en side indeholder b\u00e5de statisk og dynamisk indhold. Ved at cache de dele, der kan gemmes, kan sidens ydeevne forbedres uden at skulle cache hele siden som \u00e9n samlet enhed.<\/li><li><h3>Caching af statisk indhold<\/h3>Denne metode bruges til at gemme indhold, der sj\u00e6ldent \u00e6ndres, s\u00e5som grafiske billeder og tekstfiler. Da dette indhold typisk ikke kr\u00e6ver hyppige opdateringer, kan en kopi i cachen reducere antallet af foresp\u00f8rgsler til oprindelsesserveren og forkorte sidernes indl\u00e6sningstid.<\/li><li><h3>Caching af dynamisk indhold<\/h3>Ved denne metode caches indhold, der kan \u00e6ndre sig ofte eller genereres ud fra brugeroplysninger og bestemte betingelser. Da dynamisk indhold kan v\u00e6re personaliseret, er det s\u00e6rligt vigtigt at styre cachens gyldighed og afg\u00f8re, hvorn\u00e5r den skal opdateres. DynaCache i IBM WebSphere Application Server er et eksempel p\u00e5 en l\u00f8sning til caching af dynamisk indhold.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e10552c elementor-widget elementor-widget-image\" data-id=\"e10552c\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"800\" height=\"708\" src=\"https:\/\/potenting.com\/blog\/wp-content\/uploads\/2026\/10\/Types-of-Caching.webp\" class=\"attachment-large size-large wp-image-3497\" alt=\"Types of Caching\" srcset=\"https:\/\/potenting.com\/blog\/wp-content\/uploads\/2026\/10\/Types-of-Caching.webp 800w, https:\/\/potenting.com\/blog\/wp-content\/uploads\/2026\/10\/Types-of-Caching-300x266.webp 300w, https:\/\/potenting.com\/blog\/wp-content\/uploads\/2026\/10\/Types-of-Caching-768x680.webp 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-137bc46 e-flex e-con-boxed e-con e-parent\" data-id=\"137bc46\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-5777338 elementor-widget elementor-widget-text-editor\" data-id=\"5777338\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h2>Hvorfor b\u00f8r du bruge caching?<\/h2><p>Som n\u00e6vnt ovenfor er en af grundene til at bruge caching at \u00f8ge hastigheden for adgang til ofte anvendte data. Derudover mindsker caching serverens behandlingsbelastning. Men hvorfor?<\/p><p>N\u00e5r et system ofte har brug for et bestemt stykke data og skal hente det fra lageret, tager det ikke kun l\u00e6ngere tid, men kr\u00e6ver ogs\u00e5 ekstra behandling fra CPU&#8217;en og andre systemressourcer. Hvis disse data derimod findes i cachen, kan systemet tilg\u00e5 cachen og hente dataene uden at skulle tilg\u00e5 lageret igen.<\/p><p>Caching giver ogs\u00e5 andre fordele, som er lettere at forst\u00e5 gennem et eksempel. Forestil dig, at du har 10 GB data, der skal gemmes. Da processoren er meget hurtigere end lagersystemet, kan lagersystemet muligvis ikke gemme dataene med samme hastighed. Det er her, caching kommer ind i billedet. Processoren sender dataene til cachen, som derefter kan levere dem til lagersystemet i et passende tempo. Det g\u00f8r det muligt for processoren at arbejde videre uden un\u00f8dvendige forsinkelser, samtidig med at dataene gemmes korrekt.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-1196b3f e-flex e-con-boxed e-con e-parent\" data-id=\"1196b3f\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-730d422 elementor-widget elementor-widget-text-editor\" data-id=\"730d422\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h2>Hvordan p\u00e5virker hosting hjemmesidens ydeevne?<\/h2><p>Caching kan forbedre en hjemmesides ydeevne markant, men det er ikke den eneste faktor, der afg\u00f8r, hvor hurtigt en hjemmeside indl\u00e6ses. Hostinginfrastrukturen spiller ogs\u00e5 en vigtig rolle. Serverressourcer som CPU, RAM, lagerhastighed og netv\u00e6rksydeevne kan p\u00e5virke, hvor hurtigt foresp\u00f8rgsler behandles, is\u00e6r n\u00e5r en hjemmeside har meget trafik.<\/p><p>Selv med en effektiv cachingstrategi kan hjemmesidens ydeevne forblive d\u00e5rlig, hvis hostingmilj\u00f8et ikke kan h\u00e5ndtere sidens arbejdsbelastning effektivt. Ved at v\u00e6lge en hostingtjeneste med tilstr\u00e6kkelige ressourcer og p\u00e5lidelig ydeevne kan du forkorte serverens svartider og forbedre brugeroplevelsen. Hvis du vil forbedre din hjemmesides hastighed og ydeevne, kan det derfor v\u00e6re et effektivt skridt at se n\u00e6rmere p\u00e5 <a href=\"\/da\/webhosting\/\">webhosting<\/a>-pakker, der matcher din sides behov, sidel\u00f8bende med at du implementerer optimeringsteknikker.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-7570a06 e-flex e-con-boxed e-con e-parent\" data-id=\"7570a06\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-b3af328 elementor-widget elementor-widget-text-editor\" data-id=\"b3af328\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h2>Hvordan fungerer caching?<\/h2><p>Caching findes i forskellige typer og er en form for lagring. N\u00e5r der anmodes om data, kontrolleres cachen, f\u00f8r dataene hentes fra harddisken. Da cachehukommelsen har begr\u00e6nset kapacitet, kan alle systemets data dog ikke gemmes i den. Systemet m\u00e5 derfor afg\u00f8re, hvilke data der skal gemmes i cachen.<\/p><p>N\u00e5r cachen er fuld, og nye, ofte anvendte data skal tilf\u00f8jes, m\u00e5 systemet desuden beslutte, hvilke eksisterende data der skal fjernes. Der findes forskellige algoritmer til dette form\u00e5l, og de vurderer, hvilke data der er mindst sandsynlige at blive brugt igen.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-4ee719d e-flex e-con-boxed e-con e-parent\" data-id=\"4ee719d\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-51b9e52 elementor-widget elementor-widget-text-editor\" data-id=\"51b9e52\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h2>Hvad er et cache miss?<\/h2><p>N\u00e5r et program anmoder om forskellige typer data, sendes foresp\u00f8rgslerne til cachen. Hvis de \u00f8nskede data ikke findes i cachen, stiger antallet af cache misses. Det betyder, at systemet har tilg\u00e5et cachen flere gange, men da de n\u00f8dvendige data ikke var tilg\u00e6ngelige, m\u00e5tte det hente dem fra lageret.<\/p><p>Det forringer systemets ydeevne. For at l\u00f8se dette problem kan cachens kapacitet \u00f8ges.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-82c6df1 e-flex e-con-boxed e-con e-parent\" data-id=\"82c6df1\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-cafb898 elementor-widget elementor-widget-text-editor\" data-id=\"cafb898\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h2>Hvad er en RAID-controller?<\/h2><p>En RAID-controller er en hardwarekomponent i servere, der er specielt designet til at forbedre caching og lagerydeevne. Ved hj\u00e6lp af flashhukommelse giver dens cache ekstra lagerkapacitet og forbedrer serverens ydeevne markant.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-ef3e64c e-flex e-con-boxed e-con e-parent\" data-id=\"ef3e64c\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-740b1f3 elementor-widget elementor-widget-text-editor\" data-id=\"740b1f3\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h2>Udfordringer ved caching<\/h2><ul><li>Lokal cache: N\u00e5r forskellige versioner af de samme data gemmes p\u00e5 tv\u00e6rs af flere systemer, kan det f\u00f8re til inkonsistente data og g\u00f8re cachingen mindre effektiv.<\/li><li>Problemet med cachekoh\u00e6rens: N\u00e5r data \u00e6ndres i \u00e9n cache, bliver det en udfordring at holde de tilsvarende kopier af disse data synkroniseret i andre cacher.<\/li><li>Cache penetration: Dette opst\u00e5r, n\u00e5r de \u00f8nskede data hverken findes i cachen eller i den oprindelige database. Brug af et Bloom-filter kan hj\u00e6lpe med at mindske dette problem.<\/li><li>Cache avalanche: Et cachenedbrud eller samtidig udl\u00f8b af et stort antal cachede elementer kan sende en enorm m\u00e6ngde foresp\u00f8rgsler til databasen og potentielt for\u00e5rsage driftsforstyrrelser. Brug af en cache-klynge og v\u00e6rkt\u00f8jer som Hystrix kan hj\u00e6lpe med at afb\u00f8de dette problem.<\/li><\/ul>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-b3cff08 e-flex e-con-boxed e-con e-parent\" data-id=\"b3cff08\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-e55c7cb elementor-widget elementor-widget-text-editor\" data-id=\"e55c7cb\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h2>Afslutning<\/h2><p>Caching er en effektiv m\u00e5de at forbedre systemets ydeevne, forkorte adgangstiden til data og mindske serverens behandlingsbelastning p\u00e5. Afh\u00e6ngigt af systemets krav kan forskellige cachingmetoder bruges til at gemme ofte anvendte data og levere dem hurtigere. Det er dog afg\u00f8rende at v\u00e6lge den rette cachingstrategi og h\u00e5ndtere cachede data korrekt for at bevare ydeevnen og forebygge problemer som cache misses, problemer med cachekoh\u00e6rens og cache avalanches. N\u00e5r du forst\u00e5r, hvordan caching fungerer, hvilke typer der findes, og hvilke udfordringer der kan opst\u00e5, kan du tr\u00e6ffe bedre beslutninger, n\u00e5r du designer og optimerer systemer.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-56aa431 e-flex e-con-boxed e-con e-parent\" data-id=\"56aa431\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-4cd24fe e-con-full e-flex e-con e-child\" data-id=\"4cd24fe\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-3c9b0eb elementor-view-default elementor-widget elementor-widget-icon\" data-id=\"3c9b0eb\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"icon.default\">\n\t\t\t\t\t\t\t<div class=\"elementor-icon-wrapper\">\n\t\t\t<div class=\"elementor-icon\">\n\t\t\t<svg aria-hidden=\"true\" class=\"e-font-icon-svg e-far-question-circle\" viewBox=\"0 0 512 512\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"M256 8C119.043 8 8 119.083 8 256c0 136.997 111.043 248 248 248s248-111.003 248-248C504 119.083 392.957 8 256 8zm0 448c-110.532 0-200-89.431-200-200 0-110.495 89.472-200 200-200 110.491 0 200 89.471 200 200 0 110.53-89.431 200-200 200zm107.244-255.2c0 67.052-72.421 68.084-72.421 92.863V300c0 6.627-5.373 12-12 12h-45.647c-6.627 0-12-5.373-12-12v-8.659c0-35.745 27.1-50.034 47.579-61.516 17.561-9.845 28.324-16.541 28.324-29.579 0-17.246-21.999-28.693-39.784-28.693-23.189 0-33.894 10.977-48.942 29.969-4.057 5.12-11.46 6.071-16.666 2.124l-27.824-21.098c-5.107-3.872-6.251-11.066-2.644-16.363C184.846 131.491 214.94 112 261.794 112c49.071 0 101.45 38.304 101.45 88.8zM298 368c0 23.159-18.841 42-42 42s-42-18.841-42-42 18.841-42 42-42 42 18.841 42 42z\"><\/path><\/svg>\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-fee56b6 e-con-full e-flex e-con e-child\" data-id=\"fee56b6\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-6b539ae elementor-widget elementor-widget-text-editor\" data-id=\"6b539ae\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h2>Ofte stillede sp\u00f8rgsm\u00e5l<\/h2>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1cbe91b elementor-widget elementor-widget-text-editor\" data-id=\"1cbe91b\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h3>1. Hvordan fungerer algoritmer til cache-eviction?<\/h3><p style=\"padding-left: 40px;\">Algoritmer til cache-eviction afg\u00f8r, hvilke data der skal fjernes, n\u00e5r cachen n\u00e5r sin kapacitet. Algoritmer som LRU (Least Recently Used) og LFU (Least Frequently Used) v\u00e6lger data ud fra, hvor nyligt eller hvor ofte de er blevet tilg\u00e5et.<\/p><p style=\"padding-left: 40px;\">Brug af begge metoder forbedrer sikkerheden p\u00e5 dedikerede servere og tjenestens tilg\u00e6ngelighed.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-37e992e elementor-widget elementor-widget-text-editor\" data-id=\"37e992e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h3>2. Hvad er cachekoh\u00e6rens, og hvorfor er det vigtigt?<\/h3><p style=\"padding-left: 40px;\">Cachekoh\u00e6rens sikrer, at flere cachede kopier af de samme data forbliver konsistente, n\u00e5r der sker \u00e6ndringer. Det er s\u00e6rligt vigtigt i distribuerede systemer og multiprocessormilj\u00f8er, hvor flere cacher kan gemme kopier af de samme data.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Forestil dig, at en hjemmeside skal behandle alle data helt fra bunden, hver gang du bes\u00f8ger den, for at indl\u00e6se billeder, vise sider eller hente oplysninger. Det \u00f8ger ikke kun svartiderne, men l\u00e6gger ogs\u00e5 ekstra pres p\u00e5 serveren og systemets ressourcer. Det er her, caching kommer ind i billedet. Ved at gemme ofte anvendte data [\u2026]<\/p>\n","protected":false},"author":7,"featured_media":3490,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-3605","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Hvad er caching, og hvordan p\u00e5virker det hjemmesidens hastighed?<\/title>\n<meta name=\"description\" content=\"L\u00e6r, hvad caching er, hvordan det fungerer, de vigtigste typer, fordele og udfordringer, og hvordan det forbedrer hjemmesidens hastighed og serverens ydeevne.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/potenting.com\/da\/blog\/what-is-caching-how-it-works-and-why-it-matters\/\" \/>\n<meta property=\"og:locale\" content=\"da_DK\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Hvad er caching, og hvordan p\u00e5virker det hjemmesidens hastighed?\" \/>\n<meta property=\"og:description\" content=\"L\u00e6r, hvad caching er, hvordan det fungerer, de vigtigste typer, fordele og udfordringer, og hvordan det forbedrer hjemmesidens hastighed og serverens ydeevne.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/potenting.com\/da\/blog\/what-is-caching-how-it-works-and-why-it-matters\/\" \/>\n<meta property=\"og:site_name\" content=\"Potenting Blog\" \/>\n<meta property=\"article:published_time\" content=\"2026-10-27T09:30:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-10-27T09:53:39+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/potenting.com\/blog\/wp-content\/uploads\/2026\/10\/Dedicated-Server-Security-2.webp\" \/>\n\t<meta property=\"og:image:width\" content=\"966\" \/>\n\t<meta property=\"og:image:height\" content=\"665\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/webp\" \/>\n<meta name=\"author\" content=\"Nina Ash\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Nina Ash\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"7 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/potenting.com\\\/da\\\/blog\\\/what-is-caching-how-it-works-and-why-it-matters\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/potenting.com\\\/da\\\/blog\\\/what-is-caching-how-it-works-and-why-it-matters\\\/\"},\"author\":{\"name\":\"Nina Ash\",\"@id\":\"https:\\\/\\\/potenting.com\\\/blog\\\/#\\\/schema\\\/person\\\/743a7b4616c4d55a0ed17f5ac379fcdb\"},\"headline\":\"Hvad er caching? 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