{"id":18450,"date":"2021-12-22T08:29:00","date_gmt":"2021-12-22T01:29:00","guid":{"rendered":"https:\/\/speed.family\/?p=18450"},"modified":"2023-07-23T19:38:16","modified_gmt":"2023-07-23T12:38:16","slug":"cache-hit-ratio","status":"publish","type":"post","link":"https:\/\/kiencang.net\/cache-hit-ratio\/","title":{"rendered":"Cache hit ratio l\u00e0 g\u00ec? T\u1ea1i sao \u0111\u00e2y l\u00e0 kh\u00e1i ni\u1ec7m quan tr\u1ecdng trong CDN"},"content":{"rendered":"\n<p>Cache hit ratio l\u00e0 k\u1ebft qu\u1ea3 c\u1ee7a ph\u00e9p chia gi\u1eefa: s\u1ed1 l\u01b0\u1ee3ng y\u00eau c\u1ea7u n\u1ed9i dung m\u00e0 b\u1ed9 nh\u1edb cache th\u1ef1c hi\u1ec7n th\u00e0nh c\u00f4ng (cache hit), so v\u1edbi s\u1ed1 l\u01b0\u1ee3ng y\u00eau c\u1ea7u m\u00e0 b\u1ed9 nh\u1edb cache nh\u1eadn \u0111\u01b0\u1ee3c (cache hit + cache miss).&nbsp;<a href=\"https:\/\/kiencang.net\/cdn-la-gi\/\" target=\"_blank\" rel=\"noreferrer noopener\">M\u1ed9t&nbsp;m\u1ea1ng l\u01b0\u1edbi ph\u00e2n t\u00e1n n\u1ed9i dung (CDN)<\/a>&nbsp;cung c\u1ea5p m\u1ed9t ki\u1ec3u&nbsp;b\u1ed9 nh\u1edb cache, v\u00e0 CDN c\u00f3 hi\u1ec7u su\u1ea5t cao s\u1ebd c\u1ea7n ph\u1ea3i \u0111\u1ea1t \u0111\u01b0\u1ee3c cache hit ratio cao.<\/p>\n\n\n\n<p>C\u00f4ng th\u1ee9c cache hit ratio \u0111\u01b0\u1ee3c t\u00ednh nh\u01b0 sau:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote\">\n<p><strong>(S\u1ed1 l\u01b0\u1ee3ng cache hit) \/ (s\u1ed1 l\u01b0\u1ee3ng cache hit + s\u1ed1 l\u01b0\u1ee3ng cache miss) = Cache hit ratio<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p>V\u00ed d\u1ee5: n\u1ebfu m\u1ed9t CDN c\u00f3 390 l\u1ea7n cache hit v\u00e0 20 l\u1ea7n cache miss trong m\u1ed9t kho\u1ea3ng th\u1eddi gian nh\u1ea5t \u0111\u1ecbnh, th\u00ec cache hit ratio trong kho\u1ea3ng th\u1eddi gian \u1ea5y b\u1eb1ng 390 chia cho 410 ho\u1eb7c 0,951.&nbsp;T\u1ef7 l\u1ec7 truy c\u1eadp b\u1ed9 nh\u1edb cache (<em>cache hit ratio<\/em>, c\u00f2n g\u1ecdi l\u00e0 <em>cache hit rate<\/em>) c\u0169ng c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c bi\u1ec3u th\u1ecb b\u1eb1ng ph\u1ea7n tr\u0103m, b\u1eb1ng c\u00e1ch nh\u00e2n k\u1ebft qu\u1ea3 n\u00e0y v\u1edbi 100. Theo t\u1ef7 l\u1ec7 ph\u1ea7n tr\u0103m, ph\u1ea7n tr\u00ean c\u00f3 cache hit ratio l\u00e0 95,1%.<\/p>\n\n\n\n<p>Cache hit ratio l\u00e0 ch\u1ec9 s\u1ed1 \u00e1p d\u1ee5ng cho b\u1ea5t k\u1ef3 ki\u1ec3u b\u1ed9 nh\u1edb cache n\u00e0o;&nbsp;n\u00f3 kh\u00f4ng ch\u1ec9 d\u00f9ng \u0111\u1ec3 \u0111o cho ri\u00eang&nbsp;hi\u1ec7u su\u1ea5t CDN m\u00e0 th\u00f4i.&nbsp;Tuy nhi\u00ean, <strong>n\u00f3 l\u00e0 m\u1ed9t ti\u00eau chu\u1ea9n \u0111\u1eb7c bi\u1ec7t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi CDN<\/strong>.&nbsp;H\u1ea7u h\u1ebft c\u00e1c d\u1ecbch v\u1ee5 CDN s\u1ebd cung c\u1ea5p cho kh\u00e1ch h\u00e0ng s\u1ed1 li\u1ec7u n\u00e0y trong giao di\u1ec7n ng\u01b0\u1eddi d\u00f9ng ho\u1eb7c dashboard (b\u1ea3ng qu\u1ea3n tr\u1ecb) c\u1ee7a h\u1ecd.<\/p>\n\n\n\n<p>V\u00ed d\u1ee5:<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"630\" height=\"600\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2021\/01\/cac-request-cache.png\" alt=\"Cache hit ratio c\u1ee7a m\u1ed9t website tr\u00ean Cloudflare\" class=\"wp-image-18463\" srcset=\"https:\/\/kiencang.net\/wp-content\/uploads\/2021\/01\/cac-request-cache.png 630w, https:\/\/kiencang.net\/wp-content\/uploads\/2021\/01\/cac-request-cache-300x286.png 300w\" sizes=\"(max-width: 630px) 100vw, 630px\" \/><\/figure><\/div>\n\n\n<p>Nh\u01b0 h\u00ecnh tr\u00ean trong th\u1ed1ng k\u00ea c\u1ee7a m\u1ed9t website s\u1eed d\u1ee5ng <a href=\"https:\/\/kiencang.net\/automatic-platform-optimization-cloudflare\/\" target=\"_blank\" rel=\"noreferrer noopener\">Cloudflare APO<\/a>, b\u1ea1n d\u1ec5 d\u00e0ng t\u00ednh \u0111\u01b0\u1ee3c cache hit ratio = 6066 \/ 6682 = 90,07%<\/p>\n\n\n\n<p>C\u00f2n \u0111\u00e2y l\u00e0 m\u1ed9t th\u1ed1ng k\u00ea t\u01b0\u01a1ng t\u1ef1 tr\u00ean <a href=\"https:\/\/kiencang.net\/gioi-thieu-bunnycdn\/\" target=\"_blank\" rel=\"noreferrer noopener\">CDN c\u1ee7a BunnyCDN<\/a>:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"814\" height=\"338\" src=\"https:\/\/kiencang.net\/wp-content\/uploads\/2021\/01\/bunny-cache-hit-ration.png\" alt=\"Cache hit rate tr\u00ean trang BunnyCDN\" class=\"wp-image-18464\" srcset=\"https:\/\/kiencang.net\/wp-content\/uploads\/2021\/01\/bunny-cache-hit-ration.png 814w, https:\/\/kiencang.net\/wp-content\/uploads\/2021\/01\/bunny-cache-hit-ration-300x125.png 300w, https:\/\/kiencang.net\/wp-content\/uploads\/2021\/01\/bunny-cache-hit-ration-768x319.png 768w\" sizes=\"(max-width: 814px) 100vw, 814px\" \/><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_60 counter-hierarchy ez-toc-counter ez-toc-light-blue ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >M\u1ee5c l\u1ee5c<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\" role=\"button\"><label for=\"item-6577d61d8bf78\" ><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input aria-label=\"Toggle\" aria-label=\"item-6577d61d8bf78\"  type=\"checkbox\" id=\"item-6577d61d8bf78\"><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/kiencang.net\/cache-hit-ratio\/#1_Cache_hit_la_gi\" title=\"#1. Cache hit l\u00e0 g\u00ec?\">#1. Cache hit l\u00e0 g\u00ec?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/kiencang.net\/cache-hit-ratio\/#2_Cache_miss_la_gi\" title=\"#2. Cache miss l\u00e0 g\u00ec?\">#2. Cache miss l\u00e0 g\u00ec?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/kiencang.net\/cache-hit-ratio\/#3_Cache_hit_ratio_cua_CDN_cho_hau_het_cac_trang_web_la_bao_nhieu_thi_duoc_xem_la_tot\" title=\"#3. Cache hit ratio c\u1ee7a CDN cho h\u1ea7u h\u1ebft c\u00e1c trang web l\u00e0 bao nhi\u00eau th\u00ec \u0111\u01b0\u1ee3c xem l\u00e0 t\u1ed1t?\">#3. Cache hit ratio c\u1ee7a CDN cho h\u1ea7u h\u1ebft c\u00e1c trang web l\u00e0 bao nhi\u00eau th\u00ec \u0111\u01b0\u1ee3c xem l\u00e0 t\u1ed1t?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/kiencang.net\/cache-hit-ratio\/#4_Cache_hit_ratio_cao_luon_dong_nghia_voi_viec_CDN_co_hieu_qua_tot\" title=\"#4. Cache hit ratio cao lu\u00f4n \u0111\u1ed3ng ngh\u0129a v\u1edbi vi\u1ec7c CDN c\u00f3 hi\u1ec7u qu\u1ea3 t\u1ed1t?\">#4. Cache hit ratio cao lu\u00f4n \u0111\u1ed3ng ngh\u0129a v\u1edbi vi\u1ec7c CDN c\u00f3 hi\u1ec7u qu\u1ea3 t\u1ed1t?<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_Cache_hit_la_gi\"><\/span>#1. Cache hit l\u00e0 g\u00ec?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>&#8220;Cache hit&#8221; x\u1ea3y ra khi m\u1ed9t t\u1ec7p \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u t\u1eeb b\u1ed9 nh\u1edb cache v\u00e0 b\u1ed9 nh\u1edb cache c\u00f3 kh\u1ea3 n\u0103ng \u0111\u00e1p \u1ee9ng y\u00eau c\u1ea7u \u0111\u00f3.&nbsp;V\u00ed d\u1ee5: n\u1ebfu ng\u01b0\u1eddi d\u00f9ng truy c\u1eadp trang web hi\u1ec3n th\u1ecb h\u00ecnh \u1ea3nh m\u1ed9t con m\u00e8o \u0111ang ch\u01a1i \u0111\u00e0n piano, th\u00ec tr\u00ecnh duy\u1ec7t c\u00f3 th\u1ec3 g\u1eedi y\u00eau c\u1ea7u t\u1edbi CDN c\u1ee7a trang web cho h\u00ecnh \u1ea3nh n\u00e0y.&nbsp;<\/p>\n\n\n\n<p><strong>N\u1ebfu CDN C\u00d3 <\/strong>m\u1ed9t b\u1ea3n sao c\u1ee7a \u1ea3nh trong b\u1ed9 nh\u1edb cache c\u1ee7a n\u00f3, th\u00ec y\u00eau c\u1ea7u d\u1eabn \u0111\u1ebfn m\u1ed9t l\u1ea7n <strong>cache hit<\/strong> v\u00e0 \u1ea3nh \u0111\u01b0\u1ee3c g\u1eedi \u0111\u1ebfn tr\u00ecnh duy\u1ec7t m\u00e1y kh\u00e1ch.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_Cache_miss_la_gi\"><\/span>#2. Cache miss l\u00e0 g\u00ec?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Cache miss l\u00e0 khi b\u1ed9 nh\u1edb cache kh\u00f4ng ch\u1ee9a n\u1ed9i dung \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u.&nbsp;N\u1ebfu b\u1ea3n sao c\u1ee7a b\u1ee9c tranh m\u00e8o ch\u01a1i \u0111\u00e0n piano hi\u1ec7n <strong>KH\u00d4NG c\u00f3 trong b\u1ed9 nh\u1edb cache CDN<\/strong>, y\u00eau c\u1ea7u n\u00e0y d\u1eabn \u0111\u1ebfn <strong>cache miss<\/strong>, v\u00e0 y\u00eau c\u1ea7u \u0111\u01b0\u1ee3c chuy\u1ec3n \u0111\u1ebfn&nbsp;m\u00e1y ch\u1ee7 g\u1ed1c (origin server)&nbsp;cho b\u1ee9c \u1ea3nh g\u1ed1c.&nbsp;<\/p>\n\n\n\n<p>M\u00e1y ch\u1ee7 CDN s\u1ebd l\u01b0u \u1ea3nh v\u00e0o b\u1ed9 nh\u1edb cache sau khi m\u00e1y ch\u1ee7 g\u1ed1c ph\u1ea3n h\u1ed3i, nh\u1edd \u0111\u00f3 c\u00e1c y\u00eau c\u1ea7u ti\u1ebfp theo s\u1ebd d\u1eabn \u0111\u1ebfn k\u1ebft qu\u1ea3 l\u00e0 cache hit.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3_Cache_hit_ratio_cua_CDN_cho_hau_het_cac_trang_web_la_bao_nhieu_thi_duoc_xem_la_tot\"><\/span>#3. Cache hit ratio c\u1ee7a CDN cho h\u1ea7u h\u1ebft c\u00e1c trang web l\u00e0 bao nhi\u00eau th\u00ec \u0111\u01b0\u1ee3c xem l\u00e0 t\u1ed1t?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>M\u1ed9t trang web \u0111i\u1ec3n h\u00ecnh, ch\u1ee7 y\u1ebfu \u0111\u01b0\u1ee3c t\u1ea1o th\u00e0nh t\u1eeb n\u1ed9i dung t\u0129nh c\u00f3 th\u1ec3 d\u1ec5 d\u00e0ng c\u00f3 cache hit ratio trong ph\u1ea1m vi 95-99%.&nbsp;Tuy nhi\u00ean, \u0111\u1ea1t \u0111\u01b0\u1ee3c ch\u1ec9 s\u1ed1 n\u00e0y c\u00e0ng cao c\u00e0ng t\u1ed1t kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ee5c ti\u00eau duy nh\u1ea5t c\u1ee7a CDN.&nbsp;<\/p>\n\n\n\n<p>Ngo\u00e0i ra, m\u1ed9t trang web c\u00f3 nhi\u1ec1u n\u1ed9i dung \u0111\u1ed9ng c\u00f3 th\u1ec3 c\u00f3 cache hit ratio th\u1ea5p h\u01a1n nhi\u1ec1u (m\u1eb7c d\u00f9 <a href=\"https:\/\/kiencang.net\/caching-tinh-dong\/\" target=\"_blank\" rel=\"noreferrer noopener\">n\u1ed9i dung \u0111\u1ed9ng l\u01b0u v\u00e0o b\u1ed9 nh\u1edb \u0111\u1ec7m cache hi\u1ec7n \u0111\u00e3 tr\u1edf n\u00ean kh\u1ea3 thi<\/a> v\u1edbi c\u00e1c c\u00e0i \u0111\u1eb7t th\u00edch h\u1ee3p).<\/p>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4_Cache_hit_ratio_cao_luon_dong_nghia_voi_viec_CDN_co_hieu_qua_tot\"><\/span>#4. Cache hit ratio cao lu\u00f4n \u0111\u1ed3ng ngh\u0129a v\u1edbi vi\u1ec7c CDN c\u00f3 hi\u1ec7u qu\u1ea3 t\u1ed1t?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Cache hit ratio kh\u00f4ng ph\u1ea3i l\u00e0 ch\u1ee7 \u0111\u1ec1 c\u00f3 t\u00ednh ch\u1ed1t h\u1ea1 (last word) khi b\u00e0n v\u1ec1 hi\u1ec7u su\u1ea5t CDN;&nbsp;C\u00e1c y\u1ebfu t\u1ed1 kh\u00e1c c\u0169ng v\u00f4 c\u00f9ng quan tr\u1ecdng trong vi\u1ec7c \u0111\u00e1nh gi\u00e1 hi\u1ec7u qu\u1ea3 c\u1ee7a CDN, v\u00ed d\u1ee5,&nbsp;n\u1ed9i dung \u0111\u01b0\u1ee3c ph\u00e2n ph\u00e1t t\u1eeb \u0111\u00e2u&nbsp;c\u0169ng r\u1ea5t \u0111\u00e1ng quan t\u00e2m.&nbsp;<\/p>\n\n\n\n<p>L\u00fd t\u01b0\u1edfng nh\u1ea5t l\u00e0 CDN s\u1ebd ph\u00e2n ph\u00e1t n\u1ed9i dung t\u1eeb m\u00e1y ch\u1ee7 CDN g\u1ea7n nh\u1ea5t v\u1edbi ng\u01b0\u1eddi d\u00f9ng cu\u1ed1i.&nbsp;N\u1ebfu \u0111i\u1ec1u n\u00e0y kh\u00f4ng x\u1ea3y ra, hi\u1ec7u su\u1ea5t c\u1ee7a CDN s\u1ebd kh\u00f4ng t\u1ed1i \u01b0u.&nbsp;<\/p>\n\n\n\n<p>H\u1ec7 th\u1ed1ng m\u00e1y ch\u1ee7 c\u1ee7a&nbsp;CloudFlare CDN&nbsp;\u0111\u01b0\u1ee3c x\u00e2y d\u1ef1ng \u0111\u1ec3 ph\u1ee5c v\u1ee5 cho b\u1ea5t k\u1ef3 n\u1ed9i dung n\u00e0o t\u1eeb kho\u1ea3ng 200 v\u1ecb tr\u00ed b\u1ea5t k\u1ef3 tr\u00ean to\u00e0n th\u1ebf gi\u1edbi.&nbsp;M\u1ecdi n\u1ed9i dung \u0111\u01b0\u1ee3c l\u01b0u trong b\u1ed9 nh\u1edb cache trong m\u1ed9t trung t\u00e2m d\u1eef li\u1ec7u c\u0169ng c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c ph\u00e2n ph\u00e1t t\u1eeb m\u1ecdi trung t\u00e2m d\u1eef li\u1ec7u kh\u00e1c (tuy nhi\u00ean \u0111i\u1ec1u n\u00e0y ch\u1ec9 ch\u00ednh x\u00e1c khi b\u1ea1n s\u1eed d\u1ee5ng g\u00f3i cao c\u1ea5p c\u1ee7a Cloudflare, v\u1edbi ng\u01b0\u1eddi d\u00f9ng b\u1ea3n th\u1ea5p h\u01a1n, \u0111\u1eb7c bi\u1ec7t l\u00e0 mi\u1ec5n ph\u00ed th\u00ec Cloudflare th\u01b0\u1eddng kh\u00f4ng ph\u00e2n ph\u1ed1i n\u1ed9i dung t\u1eeb PoP t\u1ed1t nh\u1ea5t c\u00f3 th\u1ec3- \u00e2u chuy\u1ec7n n\u00e0y c\u0169ng d\u1ec5 hi\u1ec3u).<\/p>\n\n\n\n<p><a href=\"https:\/\/kiencang.net\/caching-la-gi\/\" target=\"_blank\" rel=\"noreferrer noopener\">Caching<\/a>&nbsp;l\u00e0 m\u1ed9t ph\u1ea7n quan tr\u1ecdng trong nhi\u1ec7m v\u1ee5 c\u1ee7a CDN, nh\u01b0ng m\u1ee5c \u0111\u00edch ch\u00ednh c\u1ee7a n\u00f3 l\u00e0 l\u00e0m cho c\u00e1c thu\u1ed9c t\u00ednh web n\u00f3i chung nhanh h\u01a1n v\u00e0 \u0111\u00e1ng tin c\u1eady h\u01a1n.&nbsp;Nhi\u1ec1u&nbsp;ch\u1ec9 s\u1ed1 hi\u1ec7u su\u1ea5t&nbsp;gi\u00fap \u0111o l\u01b0\u1eddng m\u1ee9c \u0111\u1ed9 m\u00e0 CDN gi\u00fap c\u1ea3i thi\u1ec7n t\u1ed1c \u0111\u1ed9 \u1ee9ng d\u1ee5ng ho\u1eb7c website.<\/p>\n\n\n\n<p class=\"has-background\" style=\"background-color:#fffccc\"><strong>B\u1ed5 sung t\u1eeb Ki\u1ebfn c\u00e0ng<\/strong>: m\u1ed9t s\u1ed1 d\u1ecbch v\u1ee5 CDN v\u1edbi m\u1ee5c ti\u00eau c\u1ea3i thi\u1ec7n ch\u1ec9 s\u1ed1 cache hit rate, ch\u1eb3ng h\u1ea1n nh\u01b0 BunnyCDN \u0111\u00e3 t\u1ea1o th\u00eam m\u1ed9t b\u1ed9 nh\u1edb trung gian l\u01b0u tr\u1eef d\u1eef li\u1ec7u v\u0129nh vi\u1ec5n n\u1eb1m gi\u1eefa CDN v\u00e0 m\u00e1y ch\u1ee7 g\u1ed1c. <a href=\"https:\/\/kiencang.net\/perma-cache-bunnycdn\/\" target=\"_blank\" rel=\"noreferrer noopener\">BunnyCDN \u0111\u1eb7t t\u00ean n\u00f3 l\u00e0 prema-cache<\/a>, bi\u1ec7n ph\u00e1p n\u00e0y gi\u00fap \u0111\u1ea9y cache hit rate l\u00ean cao nh\u1ea5t c\u00f3 th\u1ec3, d\u00f9 b\u1ea1n c\u00f3 th\u1ec3 t\u1ed1n ti\u1ec1n th\u00eam ch\u00fat \u00edt (tuy v\u1eady may m\u1eafn l\u00e0 th\u01b0\u1eddng kh\u00f4ng \u0111\u00e1ng k\u1ec3 g\u00ec). N\u1ebfu b\u1ea1n <a href=\"https:\/\/kiencang.net\/co-nen-dung-perma-cache\/\" target=\"_blank\" rel=\"noreferrer noopener\">c\u00f3 ng\u01b0\u1eddi d\u00f9ng ch\u1ee7 y\u1ebfu \u1edf Vi\u1ec7t Nam t\u00f4i r\u1ea5t khuy\u1ebfn kh\u00edch b\u1eadt t\u00ednh n\u0103ng prema-cache c\u1ee7a Bunny<\/a>.<\/p>\n\n\n\n<p class=\"has-light-green-cyan-background-color has-background\">L\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 c\u1ea3i thi\u1ec7n cache hit rate n\u1ebfu CDN c\u1ee7a b\u1ea1n kh\u00f4ng c\u00f3 t\u00ednh n\u0103ng t\u01b0\u01a1ng t\u1ef1 prema-cache c\u1ee7a Bunny? C\u00e1ch l\u00e0m l\u00e0 h\u1ea1n ch\u1ebf vi\u1ec7c thay \u0111\u1ed5i c\u00e1c t\u00e0i nguy\u00ean t\u0129nh tr\u00ean trang theo c\u00e1ch kh\u00f4ng c\u1ea7n thi\u1ebft. Trong khi t\u00e0i nguy\u00ean media nh\u01b0 \u1ea3nh hi\u1ebfm khi thay \u0111\u1ed5i, th\u00ec c\u00e1c file CSS v\u00e0 JS l\u1ea1i r\u1ea5t hay \u0111\u01b0\u1ee3c b\u1ed5 sung, nh\u1ea5t l\u00e0 khi b\u1ea1n d\u00f9ng t\u00ednh n\u0103ng g\u1ed9p ho\u1eb7c\/v\u00e0 n\u00e9n CSS\/JS. Nh\u00ecn chung v\u1edbi c\u00f4ng ngh\u1ec7 c\u1ee7a http\/2 <a href=\"https:\/\/kiencang.net\/bo-gop-minify-css\/\" target=\"_blank\" rel=\"noreferrer noopener\">b\u1ea1n c\u00f3 th\u1ec3 b\u1ecf t\u00ednh n\u0103ng g\u1ed9p\/n\u00e9n \u0111i \u0111\u01b0\u1ee3c r\u1ed3i<\/a>, \u0111i\u1ec1u n\u00e0y c\u00f3 nhi\u1ec1u l\u1ee3i \u00edch kh\u00e1c n\u1eefa, ngo\u00e0i chuy\u1ec7n c\u1ea3i thi\u1ec7n s\u1ed1 l\u01b0\u1ee3ng cache hit c\u1ee7a b\u1ea1n.<\/p>\n\n\n\n<p><em>(D\u1ecbch t\u1eeb b\u00e0i vi\u1ebft <a href=\"https:\/\/www.cloudflare.com\/learning\/cdn\/what-is-a-cache-hit-ratio\/\" target=\"_blank\" rel=\"noreferrer noopener nofollow\">What is a Cache Hit Ratio?<\/a> c\u1ee7a Cloudflare)<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Cache hit ratio l\u00e0 k\u1ebft qu\u1ea3 c\u1ee7a ph\u00e9p chia gi\u1eefa: s\u1ed1 l\u01b0\u1ee3ng y\u00eau c\u1ea7u n\u1ed9i dung m\u00e0 b\u1ed9 nh\u1edb cache th\u1ef1c hi\u1ec7n th\u00e0nh c\u00f4ng (cache hit), so v\u1edbi s\u1ed1 l\u01b0\u1ee3ng y\u00eau c\u1ea7u m\u00e0 b\u1ed9 nh\u1edb cache nh\u1eadn \u0111\u01b0\u1ee3c (cache hit + cache miss).&nbsp;M\u1ed9t&nbsp;m\u1ea1ng l\u01b0\u1edbi ph\u00e2n t\u00e1n n\u1ed9i dung (CDN)&nbsp;cung c\u1ea5p m\u1ed9t ki\u1ec3u&nbsp;b\u1ed9 nh\u1edb cache, v\u00e0 &hellip;<\/p>\n","protected":false},"author":1,"featured_media":21533,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[249],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Cache hit ratio l\u00e0 g\u00ec? T\u1ea1i sao \u0111\u00e2y l\u00e0 kh\u00e1i ni\u1ec7m quan tr\u1ecdng trong CDN &#8226; Ki\u1ebfn c\u00e0ng<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/kiencang.net\/cache-hit-ratio\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Cache hit ratio l\u00e0 g\u00ec? T\u1ea1i sao \u0111\u00e2y l\u00e0 kh\u00e1i ni\u1ec7m quan tr\u1ecdng trong CDN &#8226; Ki\u1ebfn c\u00e0ng\" \/>\n<meta property=\"og:description\" content=\"Cache hit ratio l\u00e0 k\u1ebft qu\u1ea3 c\u1ee7a ph\u00e9p chia gi\u1eefa: s\u1ed1 l\u01b0\u1ee3ng y\u00eau c\u1ea7u n\u1ed9i dung m\u00e0 b\u1ed9 nh\u1edb cache th\u1ef1c hi\u1ec7n th\u00e0nh c\u00f4ng (cache hit), so v\u1edbi s\u1ed1 l\u01b0\u1ee3ng y\u00eau c\u1ea7u m\u00e0 b\u1ed9 nh\u1edb cache nh\u1eadn \u0111\u01b0\u1ee3c (cache hit + cache miss).&nbsp;M\u1ed9t&nbsp;m\u1ea1ng l\u01b0\u1edbi ph\u00e2n t\u00e1n n\u1ed9i dung (CDN)&nbsp;cung c\u1ea5p m\u1ed9t ki\u1ec3u&nbsp;b\u1ed9 nh\u1edb cache, v\u00e0 &hellip;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/kiencang.net\/cache-hit-ratio\/\" \/>\n<meta property=\"og:site_name\" content=\"Ki\u1ebfn c\u00e0ng\" \/>\n<meta property=\"article:author\" content=\"https:\/\/www.facebook.com\/anhducnguyen87\/\" \/>\n<meta property=\"article:published_time\" content=\"2021-12-22T01:29:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-07-23T12:38:16+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/kiencang.net\/wp-content\/uploads\/2021\/01\/cache-hit-ratio.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"640\" \/>\n\t<meta property=\"og:image:height\" content=\"426\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Nguy\u1ec5n \u0110\u1ee9c Anh\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u0110\u01b0\u1ee3c vi\u1ebft b\u1edfi\" \/>\n\t<meta name=\"twitter:data1\" content=\"Nguy\u1ec5n \u0110\u1ee9c Anh\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u01af\u1edbc t\u00ednh th\u1eddi gian \u0111\u1ecdc\" \/>\n\t<meta name=\"twitter:data2\" content=\"6 ph\u00fat\" \/>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Cache hit ratio l\u00e0 g\u00ec? T\u1ea1i sao \u0111\u00e2y l\u00e0 kh\u00e1i ni\u1ec7m quan tr\u1ecdng trong CDN &#8226; Ki\u1ebfn c\u00e0ng","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/kiencang.net\/cache-hit-ratio\/","og_locale":"vi_VN","og_type":"article","og_title":"Cache hit ratio l\u00e0 g\u00ec? T\u1ea1i sao \u0111\u00e2y l\u00e0 kh\u00e1i ni\u1ec7m quan tr\u1ecdng trong CDN &#8226; Ki\u1ebfn c\u00e0ng","og_description":"Cache hit ratio l\u00e0 k\u1ebft qu\u1ea3 c\u1ee7a ph\u00e9p chia gi\u1eefa: s\u1ed1 l\u01b0\u1ee3ng y\u00eau c\u1ea7u n\u1ed9i dung m\u00e0 b\u1ed9 nh\u1edb cache th\u1ef1c hi\u1ec7n th\u00e0nh c\u00f4ng (cache hit), so v\u1edbi s\u1ed1 l\u01b0\u1ee3ng y\u00eau c\u1ea7u m\u00e0 b\u1ed9 nh\u1edb cache nh\u1eadn \u0111\u01b0\u1ee3c (cache hit + cache miss).&nbsp;M\u1ed9t&nbsp;m\u1ea1ng l\u01b0\u1edbi ph\u00e2n t\u00e1n n\u1ed9i dung (CDN)&nbsp;cung c\u1ea5p m\u1ed9t ki\u1ec3u&nbsp;b\u1ed9 nh\u1edb cache, v\u00e0 &hellip;","og_url":"https:\/\/kiencang.net\/cache-hit-ratio\/","og_site_name":"Ki\u1ebfn c\u00e0ng","article_author":"https:\/\/www.facebook.com\/anhducnguyen87\/","article_published_time":"2021-12-22T01:29:00+00:00","article_modified_time":"2023-07-23T12:38:16+00:00","og_image":[{"width":640,"height":426,"url":"https:\/\/kiencang.net\/wp-content\/uploads\/2021\/01\/cache-hit-ratio.jpg","type":"image\/jpeg"}],"author":"Nguy\u1ec5n \u0110\u1ee9c Anh","twitter_card":"summary_large_image","twitter_misc":{"\u0110\u01b0\u1ee3c vi\u1ebft b\u1edfi":"Nguy\u1ec5n \u0110\u1ee9c Anh","\u01af\u1edbc t\u00ednh th\u1eddi gian \u0111\u1ecdc":"6 ph\u00fat"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/kiencang.net\/cache-hit-ratio\/","url":"https:\/\/kiencang.net\/cache-hit-ratio\/","name":"Cache hit ratio l\u00e0 g\u00ec? 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