{"id":35170,"date":"2020-03-24T03:17:01","date_gmt":"2020-03-24T10:17:01","guid":{"rendered":"https:\/\/kinsta.com\/?post_type=knowledgebase&#038;p=43306"},"modified":"2025-10-01T20:04:39","modified_gmt":"2025-10-01T20:04:39","slug":"vad-ar-mysql","status":"publish","type":"post","link":"https:\/\/kinsta.com\/se\/blog\/vad-ar-mysql\/","title":{"rendered":"Vad \u00e4r MySQL? En nyb\u00f6rjarv\u00e4nlig f\u00f6rklaring"},"content":{"rendered":"<p><a href=\"https:\/\/www.mysql.com\/\" target=\"_blank\" rel=\"noopener noreferrer\">MySQL<\/a> \u00e4r ett \u00f6ppen k\u00e4llkods SQL-relationsdatabashanteringssystem som \u00e4r utvecklat och st\u00f6ds av Oracle.<\/p>\n<p>Det \u00e4r det korta svaret p\u00e5 fr\u00e5gan &#8221;Vad \u00e4r MySQL&#8221;, men l\u00e5t oss bryta ner det i termer som \u00e4r lite mer m\u00e4nniskov\u00e4nliga.<\/p>\n<p>En databas \u00e4r en strukturerad samling data som \u00e4r organiserad f\u00f6r enkel anv\u00e4ndning och h\u00e4mtning. F\u00f6r en WordPress-webbplats \u00e4r dessa &#8221;data&#8221; saker som texten i dina blogginl\u00e4gg, information f\u00f6r alla registrerade anv\u00e4ndare p\u00e5 din webbplats, <a href=\"https:\/\/kinsta.com\/se\/blog\/wp-options-autoladdad-data\/\" target=\"_blank\" rel=\"noopener noreferrer\">autoladdade data<\/a>, viktiga inst\u00e4llningar,<\/p>\n<p>MySQL \u00e4r helt enkelt ett popul\u00e4rt system som kan lagra och hantera dessa data \u00e5t dig, och det \u00e4r en s\u00e4rskilt popul\u00e4r <a href=\"https:\/\/kinsta.com\/se\/blog\/wordpressdatabasen\/\" target=\"_blank\" rel=\"noopener noreferrer\">databasl\u00f6sning f\u00f6r WordPress-webbplatser<\/a>.<\/p>\n<p>L\u00e4stips:\u00a0<a href=\"https:\/\/kinsta.com\/se\/blog\/mysql-servern-har-forsvunnit\/\" target=\"_blank\" rel=\"noopener noreferrer\">S\u00e5 h\u00e4r \u00e5tg\u00e4rdar du &#8221;MySQL-servern har f\u00f6rsvunnit&#8221;-felet i WordPress<\/a> och <a href=\"https:\/\/kinsta.com\/se\/blog\/mysql-1064-felet\/\" target=\"_blank\" rel=\"noopener noreferrer\">S\u00e5 h\u00e4r \u00e5tg\u00e4rdar du MySQL 1064-felet<\/a>.<\/p>\n<p>L\u00e5t oss g\u00e5 in lite djupare i fr\u00e5gan nu.<\/p>\n<h2>Vad \u00e4r MySQL? Mer Detaljerat<\/h2>\n<p>MySQL lanserades ursprungligen redan 1995. Sedan dess har det g\u00e5tt igenom ett par f\u00f6r\u00e4ndringar g\u00e4llande \u00e4gande\/f\u00f6rvaltarskap, innan de hamnade p\u00e5 Oracle Corporation i 2010. Medan Oracle \u00e4r de som best\u00e4mmer nu \u00e4r MySQL fortfarande <strong>\u00f6ppen k\u00e4llkod<\/strong>, vilket inneb\u00e4r att du fritt kan anv\u00e4nda och \u00e4ndra den.<\/p>\n<figure id=\"attachment_37464\" aria-describedby=\"caption-attachment-37464\" style=\"width: 300px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-37464 size-medium\" src=\"https:\/\/kinsta.com\/se\/wp-content\/uploads\/sites\/9\/2020\/03\/mysql-logo-1-300x204.png\" alt=\"mysql-logo\" width=\"300\" height=\"204\" srcset=\"https:\/\/kinsta.com\/se\/wp-content\/uploads\/sites\/9\/2020\/03\/mysql-logo-1-300x204.png 300w, https:\/\/kinsta.com\/se\/wp-content\/uploads\/sites\/9\/2020\/03\/mysql-logo-1-1024x697.png 1024w, https:\/\/kinsta.com\/se\/wp-content\/uploads\/sites\/9\/2020\/03\/mysql-logo-1-768x523.png 768w, https:\/\/kinsta.com\/se\/wp-content\/uploads\/sites\/9\/2020\/03\/mysql-logo-1.png 1213w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><figcaption id=\"caption-attachment-37464\" class=\"wp-caption-text\">MySQL logotyp (bildk\u00e4lla: <a href=\"https:\/\/www.mysql.com\/\">MySQL\/Oracle<\/a>)<\/figcaption><\/figure>\n<p>Namnet kommer fr\u00e5n att s\u00e4tta ihop &#8221;My&#8221; \u2013 namnet p\u00e5 medgrundarens dotter \u2013 med SQL \u2013 f\u00f6rkortningen f\u00f6r Structured Query Language, vilket \u00e4r ett programmeringsspr\u00e5k som hj\u00e4lper dig att komma \u00e5t och hantera data i en relationsdatabas.<\/p>\n<p>F\u00f6r att f\u00f6rst\u00e5 hur MySQL fungerar \u00e4r det viktigt att kunna tv\u00e5 n\u00e4rliggande begrepp:<\/p>\n<ul>\n<li><a href=\"#relational-database\">Relationsdatabase<\/a><\/li>\n<li><a href=\"#client-server-model\">Klient-server modell<\/a><\/li>\n<\/ul>\n<h3 id=\"relational-database\">Relationsdatabaser<\/h3>\n<p>N\u00e4r det g\u00e4ller att lagra data i en databas finns det olika tillv\u00e4gag\u00e5ngss\u00e4tt.<\/p>\n<p>MySQL v\u00e4ljer ett tillv\u00e4gag\u00e5ngss\u00e4tt som kallas en <strong>relationsdatabas<\/strong>.<\/p>\n<p>Med en relationsdatabas delas dina data upp i flera separata lagringsomr\u00e5den \u2013 kallade <strong>tabeller<\/strong> \u2013 ist\u00e4llet f\u00f6r att kasta in allt i en stor lagringsenhet.<\/p>\n<p>L\u00e5t oss till exempel s\u00e4ga att du vill lagra tv\u00e5 typer av information:<\/p>\n<ul>\n<li><strong>Kunder<\/strong> \u2013 deras namn, adress, detaljer etc.<\/li>\n<li><strong>Best\u00e4llningar<\/strong> \u2013 vilka produkter som k\u00f6ptes, priset, vem gjorde best\u00e4llningen, etc.<\/li>\n<\/ul>\n<p>Om du f\u00f6rs\u00f6kte klumpa ihop alla data tillsammans i en stor h\u00f6g, skulle du f\u00e5 n\u00e5gra problem som:<\/p>\n<ul>\n<li><strong>Olika data<\/strong> \u2013 de data som du beh\u00f6ver samla in f\u00f6r en best\u00e4llning \u00e4r annorlunda \u00e4n f\u00f6r en kund.<\/li>\n<li><strong>Dublettdata<\/strong> \u2013 varje kund har ett namn, och varje best\u00e4llning har ocks\u00e5 namnet p\u00e5 en kund. Hantering av dubblettdata blir r\u00f6rigt.<\/li>\n<li><strong>Ingen organisation<\/strong> \u2013 hur kopplar du p\u00e5 ett tillf\u00f6rlitligt s\u00e4tt best\u00e4llningsinformation till kundinformation?<\/li>\n<\/ul>\n<p>F\u00f6r att l\u00f6sa dessa problem skulle en relationsdatabas anv\u00e4nda en separat tabell f\u00f6r kunder och en annan separat tabell f\u00f6r best\u00e4llningar.<\/p>\n<p>Men du skulle f\u00f6rmodligen ocks\u00e5 vilja kunna s\u00e4ga &#8221;visa mig alla best\u00e4llningar f\u00f6r John Doe&#8221;. Det \u00e4r d\u00e4r <strong>relationsdelen<\/strong> kommer in.<\/p>\n<p>Med hj\u00e4lp av n\u00e5got som kallas en <strong>&#8221;nyckel&#8221;<\/strong> kan du l\u00e4nka samman data fr\u00e5n dessa tv\u00e5 tabeller s\u00e5 att du kan manipulera och kombinera data i olika tabeller efter behov. Det \u00e4r viktigt att notera att en nyckel inte \u00e4r kundens namn. Ist\u00e4llet skulle du anv\u00e4nda n\u00e5got 100% unikt, som ett numeriskt ID-nummer.<\/p>\n<p>Om du n\u00e5gonsin har tittat p\u00e5 din WordPress-webbplats databas ser du att den anv\u00e4nder denna relationsmodell och har alla dina data uppdelade i separata tabeller.<\/p>\n<p>Som standard anv\u00e4nder WordPress 12 separata tabeller, men m\u00e5nga WordPress-plugins kommer ocks\u00e5 att l\u00e4gga till egna tabeller. Till exempel har databasen f\u00f6r WordPress-webbplatsen nedan 44 separata tabeller!<\/p>\n<figure style=\"width: 2549px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/kinsta.com\/se\/wp-content\/uploads\/sites\/9\/2019\/04\/olika-tabeller-i-mysql.png\" alt=\"Ett exempel p\u00e5 olika tabeller i MySQL\" width=\"2549\" height=\"1449\"><figcaption class=\"wp-caption-text\">Ett exempel p\u00e5 olika tabeller i MySQL<\/figcaption><\/figure>\n<p>F\u00f6r att avrunda detta relationskoncept, l\u00e5t oss g\u00f6ra det specifikt f\u00f6r WordPress\u2026<\/p>\n<p>WordPress lagrar blogginl\u00e4gg i <strong>wp_posts<\/strong>-tabellen och anv\u00e4ndare i <strong>wp_users<\/strong>-tabellen. Men eftersom dessa tv\u00e5 tabeller \u00e4r anslutna med en <strong>nyckel<\/strong> kan du l\u00e4nka varje anv\u00e4ndarkonto med alla blogginl\u00e4gg som varje anv\u00e4ndare har skrivit.<\/p>\n<p>S\u00e5 h\u00e4r ser det ut i databasen.<\/p>\n<p>Varje inl\u00e4gg tilldelas en <strong>post_author<\/strong>, som \u00e4r ett unikt identifieringsnummer (detta \u00e4r nyckeln):<\/p>\n<figure style=\"width: 2036px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/kinsta.com\/se\/wp-content\/uploads\/sites\/9\/2019\/04\/tabellen-wp-posts.png\" alt=\"Tabellen wp_posts\" width=\"2036\" height=\"1022\"><figcaption class=\"wp-caption-text\">Tabellen wp_posts<\/figcaption><\/figure>\n<p>Om du sedan vill se vilket anv\u00e4ndarkonto som motsvarar det numret kan du titta p\u00e5 <strong>ID-numret<\/strong> i <strong>wp_users<\/strong>-tabellen:<\/p>\n<figure style=\"width: 1965px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/kinsta.com\/se\/wp-content\/uploads\/sites\/9\/2019\/04\/wp-users-tabellen.png\" alt=\"wp_users-tabellen\" width=\"1965\" height=\"912\"><figcaption class=\"wp-caption-text\">wp_users-tabellen<\/figcaption><\/figure>\n<p>Nyckeln \u2013 ID-numret \u2013 \u00e4r det som binder samman allt. Och det \u00e4r s\u00e5 de \u00e4r &#8221;relaterade&#8221; till varandra, trots att de lagrar data i separata tabeller.<\/p>\n<h3 id=\"client-server-model\">Klient-server modell<\/h3>\n<p>Ut\u00f6ver att vara ett <strong>relationsdatabassystem<\/strong> anv\u00e4nder MySQL ocks\u00e5 n\u00e5got som kallas <strong>klient-server-modellen<\/strong>.<\/p>\n<p><strong>Serverdelen <\/strong>\u00e4r d\u00e4r dina data faktiskt finns. F\u00f6r att komma \u00e5t dessa data m\u00e5ste du dock f\u00f6rfr\u00e5ga dem. Det \u00e4r d\u00e4r <strong>klienten<\/strong> kommer in. Genom att anv\u00e4nda SQL \u2013 programmeringsspr\u00e5ket vi n\u00e4mnde tidigare \u2013 skickar <strong>klienten<\/strong> en f\u00f6rfr\u00e5gan till databasens <strong>server<\/strong> f\u00f6r de data som klienten beh\u00f6ver.<\/p>\n<p>Om n\u00e5gon till exempel bes\u00f6ker ett blogginl\u00e4gg p\u00e5 din webbplats skickar din WordPress-webbplats flera SQL-f\u00f6rfr\u00e5gningar till databasservern f\u00f6r att f\u00e5 all information den beh\u00f6ver f\u00f6r att leverera blogginl\u00e4gget till bes\u00f6karens webbl\u00e4sare. Den skulle:<\/p>\n<ul>\n<li>F\u00f6rfr\u00e5ga <strong>wp_post<\/strong>-tabellen f\u00f6r att f\u00e5 inneh\u00e5llet f\u00f6r blogginl\u00e4gget<\/li>\n<li>F\u00f6rfr\u00e5ga <strong>wp_users<\/strong>-tabellen f\u00f6r att f\u00e5 information om f\u00f6rfattarrutan (med hj\u00e4lp av <strong>nyckeln<\/strong> vi visade dig ovan)<\/li>\n<li>Osv.<\/li>\n<\/ul>\n<p>Om du vill se exakt vilka typer av databasf\u00f6rfr\u00e5gningar som g\u00f6rs av din WordPress-webbplats kan du anv\u00e4nda ett underbart gratisplugin som heter <a href=\"https:\/\/kinsta.com\/blog\/query-monitor\/\" target=\"_blank\" rel=\"noopener noreferrer\">Query Monitor<\/a> f\u00f6r att se det exakta samspelet mellan din WordPress-webbplats (klienten) och databasservern:<\/p>\n<figure style=\"width: 2548px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/kinsta.com\/se\/wp-content\/uploads\/sites\/9\/2019\/04\/pluginet-query-monitor.png\" alt=\"Pluginet Query Monitor visar individuella SQL-f\u00f6rfr\u00e5gningar som skickas till MySQL-servern\" width=\"2548\" height=\"1458\"><figcaption class=\"wp-caption-text\">Pluginet Query Monitor visar individuella SQL-f\u00f6rfr\u00e5gningar som skickas till MySQL-servern<\/figcaption><\/figure>\n<p>En annan premiuml\u00f6sning som <a href=\"https:\/\/kinsta.com\/docs\/wordpress-hosting\/wordpress-monitoring\/custom-new-relic-tracking\/\">du kan anv\u00e4nda \u00e4r New Relic<\/a> (licens kr\u00e4vs). Om din WordPress-webbplats inte kan komma \u00e5t databasservern, utl\u00f6ses meddelandet om det vanliga <a href=\"https:\/\/kinsta.com\/se\/blog\/felet-att-uppratta-databasanslutning\/\">felet om att uppr\u00e4tta ett databasanslutning<\/a>. P\u00e5 Kinsta anv\u00e4nder vi det inbyggda <a href=\"https:\/\/kinsta.com\/se\/apm-verktyg\/\">Kinsta APM-verktyget<\/a> f\u00f6r att \u00f6vervaka dina webbplatser.<\/p>\n<kinsta-video src=\"https:\/\/www.youtube.com\/watch?v=S2e5qEJR0_M\"><\/kinsta-video>\n<h2>Kinsta anv\u00e4nder MariaDB, inte MySQL: Vad \u00e4r skillnaden?<\/h2>\n<p>H\u00e4r p\u00e5 Kinsta anv\u00e4nder vi ett databassystem som heter <strong>MariaDB<\/strong>, inte MySQL. Men alla samma egenskaper som vi visat dig med MySQL g\u00e4ller ocks\u00e5 f\u00f6r MariaDB.<\/p>\n<p>Faktum \u00e4r att <a href=\"https:\/\/kinsta.com\/se\/blog\/mariadb-vs-mysql\/\" target=\"_blank\" rel=\"noopener noreferrer\">MariaDB faktiskt \u00e4r en fork av MySQL<\/a>, och MariaDBs ledande utvecklare \u00e4r en av de ursprungliga grundarna till MySQL.<em> En &#8221;fork&#8221; inneb\u00e4r att MariaDB-utvecklarna tog den ursprungliga \u00f6ppna k\u00e4llkoden fr\u00e5n MySQL som sin bas och byggde sedan vidare p\u00e5 den f\u00f6r att skapa MariaDB.<\/em><\/p>\n<p>S\u00e5 medan den har ett annat namn \u00e4r MariaDB t\u00e4tt kopplad till MySQL och erbjuder full &#8221;drop-in&#8221;-ers\u00e4ttningskapabilitet (du kan allts\u00e5 s\u00f6ml\u00f6st byta fr\u00e5n MySQL till MariaDB utan att beh\u00f6va vidta n\u00e5gra s\u00e4rskilda f\u00f6rsiktighets\u00e5tg\u00e4rder).<\/p>\n<p>Men medan MariaDB erbjuder driftskompatibilitet med MySQL, erbjuder det ocks\u00e5 <strong>f\u00f6rb\u00e4ttrad prestanda<\/strong> inom vissa omr\u00e5den, vilket passar med v\u00e5r filosofi att alltid anv\u00e4nda den b\u00e4sta arkitekturen f\u00f6r att driva din WordPress-webbplats.<\/p>\n<aside role=\"note\" class=\"wp-block-kinsta-notice is-style-info\">\n            <h3>Info<\/h3>\n        <p>Alla Kinsta-planer har veckovis automatisk MySQL-databasoptimering f\u00f6r att s\u00e4kerst\u00e4lla b\u00e4ttre MariaDB-prestanda. <a href=\"https:\/\/kinsta.com\/se\/priser\/?in-article-cta\" target=\"_blank\" rel=\"noopener noreferrer\">Kolla in v\u00e5ra planer<\/a> f\u00f6r mer info.<\/p>\n<\/aside>\n\n\n<h2>Sammanfattning: Vad \u00e4r MySQL?<\/h2>\n<p>MySQL \u00e4r ett \u00f6ppen k\u00e4llkods hanteringssystem f\u00f6r relationsdatabaser. F\u00f6r WordPress-webbplatser betyder det att det blir enklare att lagra alla dina blogginl\u00e4gg, anv\u00e4ndare, <a href=\"https:\/\/kinsta.com\/se\/blog\/wp-options-autoladdad-data\/\" target=\"_blank\" rel=\"noopener noreferrer\">plugininformation<\/a>, etc.<\/p>\n<p>Den lagrar den informationen i separata &#8221;tabeller&#8221; och f\u00f6rbinder dem med &#8221;nycklar&#8221;, varf\u00f6r databasen kallas <strong>relationell<\/strong>.<\/p>\n<p>N\u00e4r din WordPress-webbplats beh\u00f6ver komma \u00e5t den informationen skickar den en f\u00f6rfr\u00e5gan till MySQL-databasservern med SQL (det h\u00e4r \u00e4r <strong>klient-server-modellen<\/strong>).<\/p>\n<p>Kinsta anv\u00e4nder MariaDB, inte MySQL. MariaDB \u00e4r dock en fork av MySQL fr\u00e5n en av grundarna av MySQL och erbjuder drop-in-ers\u00e4ttnings driftskompatibilitet, liksom vissa prestandaf\u00f6rb\u00e4ttringar. D\u00e4rf\u00f6r g\u00e4ller alla k\u00e4rnkoncepten i denna artikel \u00e4ven f\u00f6r MariaDB.<\/p>\n<p>Om du \u00e4r kund hos Kinsta erbjuder vi .b\u00e5de <a href=\"https:\/\/kinsta.com\/docs\/wordpress-hosting\/database-management\/wordpress-database-access\/\" target=\"_blank\" rel=\"noopener noreferrer\">direkt databas\u00e5tkomst<\/a>, samt m\u00f6jligheten att anv\u00e4nda databashanteringsverktyg som <a href=\"https:\/\/kinsta.com\/blog\/how-to-restore-mysql-database-using-phpmyadmin\/\">phpMyAdmin<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>MySQL \u00e4r ett \u00f6ppen k\u00e4llkods SQL-relationsdatabashanteringssystem som \u00e4r utvecklat och st\u00f6ds av Oracle. Det \u00e4r det korta svaret p\u00e5 fr\u00e5gan &#8221;Vad \u00e4r MySQL&#8221;, men l\u00e5t oss &#8230;<\/p>\n","protected":false},"author":38,"featured_media":35178,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_kinsta_gated_content":false,"_kinsta_gated_content_redirect":"","footnotes":""},"tags":[42,29],"topic":[],"class_list":["post-35170","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","tag-webdev","tag-wordpress"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.6 (Yoast SEO v24.6) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Vad \u00e4r MySQL? 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