{"id":3637,"date":"2026-10-27T09:30:00","date_gmt":"2026-10-27T09:30:00","guid":{"rendered":"https:\/\/potenting.com\/vi\/blog\/what-is-caching-how-it-works-and-why-it-matters\/"},"modified":"2026-10-27T09:53:40","modified_gmt":"2026-10-27T09:53:40","slug":"what-is-caching-how-it-works-and-why-it-matters-vi","status":"publish","type":"post","link":"https:\/\/potenting.com\/vi\/blog\/what-is-caching-how-it-works-and-why-it-matters\/","title":{"rendered":"Caching l\u00e0 g\u00ec? C\u00e1ch ho\u1ea1t \u0111\u1ed9ng v\u00e0 vai tr\u00f2 quan tr\u1ecdng c\u1ee7a caching"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"3637\" class=\"elementor elementor-3637\" 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;Kh\\u00f4ng t\\u00ecm th\\u1ea5y ti\\u00eau \\u0111\\u1ec1 n\\u00e0o tr\\u00ean trang n\\u00e0y.&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\tM\u1ee5c l\u1ee5c\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>H\u00e3y t\u01b0\u1edfng t\u01b0\u1ee3ng m\u1ed7i l\u1ea7n b\u1ea1n truy c\u1eadp m\u1ed9t website, n\u00f3 ph\u1ea3i x\u1eed l\u00fd l\u1ea1i to\u00e0n b\u1ed9 d\u1eef li\u1ec7u t\u1eeb \u0111\u1ea7u \u0111\u1ec3 t\u1ea3i h\u00ecnh \u1ea3nh, hi\u1ec3n th\u1ecb trang ho\u1eb7c truy xu\u1ea5t th\u00f4ng tin. \u0110i\u1ec1u n\u00e0y kh\u00f4ng ch\u1ec9 l\u00e0m t\u0103ng th\u1eddi gian ph\u1ea3n h\u1ed3i m\u00e0 c\u00f2n g\u00e2y th\u00eam \u00e1p l\u1ef1c l\u00ean m\u00e1y ch\u1ee7 v\u00e0 t\u00e0i nguy\u00ean h\u1ec7 th\u1ed1ng. \u0110\u00e2y ch\u00ednh l\u00e0 l\u00fac caching ph\u00e1t huy t\u00e1c d\u1ee5ng. B\u1eb1ng c\u00e1ch l\u01b0u tr\u1eef d\u1eef li\u1ec7u th\u01b0\u1eddng xuy\u00ean \u0111\u01b0\u1ee3c truy c\u1eadp trong b\u1ed9 nh\u1edb nhanh h\u01a1n, caching c\u00f3 th\u1ec3 gi\u1ea3m th\u1eddi gian truy c\u1eadp d\u1eef li\u1ec7u v\u00e0 c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t h\u1ec7 th\u1ed1ng. Nh\u01b0ng caching ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o, c\u00f3 nh\u1eefng lo\u1ea1i caching n\u00e0o v\u00e0 nh\u1eefng th\u00e1ch th\u1ee9c n\u00e0o c\u00f3 th\u1ec3 ph\u00e1t sinh khi s\u1eed d\u1ee5ng n\u00f3?<\/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>Caching l\u00e0 g\u00ec?<\/h2><p>Caching l\u00e0 qu\u00e1 tr\u00ecnh l\u01b0u tr\u1eef d\u1eef li\u1ec7u th\u01b0\u1eddng xuy\u00ean \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong m\u1ed9t b\u1ed9 nh\u1edb ri\u00eang. Gi\u1ea3 s\u1eed b\u1ea1n c\u1ea7n truy c\u1eadp m\u1ed9t \u1ee9ng d\u1ee5ng ho\u1eb7c m\u1ed9t ph\u1ea7n d\u1eef li\u1ec7u c\u1ee5 th\u1ec3 c\u1ee9 v\u00e0i ph\u00fat m\u1ed9t l\u1ea7n. V\u00ec d\u1eef li\u1ec7u n\u00e0y \u0111\u01b0\u1ee3c truy c\u1eadp th\u01b0\u1eddng xuy\u00ean, n\u00f3 s\u1ebd \u0111\u01b0\u1ee3c l\u01b0u \u1edf m\u1ed9t n\u01a1i g\u1ecdi l\u00e0 b\u1ed9 nh\u1edb \u0111\u1ec7m (cache) \u0111\u1ec3 kh\u00f4ng ph\u1ea3i truy xu\u1ea5t l\u1ea1i m\u1ed7i khi b\u1ea1n s\u1eed d\u1ee5ng. C\u00f3 nhi\u1ec1u l\u00fd do \u0111\u1ec3 s\u1eed d\u1ee5ng caching, nh\u01b0ng m\u1ed9t trong nh\u1eefng l\u00fd do quan tr\u1ecdng nh\u1ea5t l\u00e0 gi\u1ea3m th\u1eddi gian truy c\u1eadp d\u1eef li\u1ec7u.<\/p><p>\u1ed4 c\u1ee9ng c\u00f3 t\u1ed1c \u0111\u1ed9 th\u1ea5p, v\u00e0 ngay c\u1ea3 nh\u1eefng \u1ed5 nhanh nh\u1ea5t c\u0169ng kh\u00f4ng th\u1ec3 s\u00e1nh \u0111\u01b0\u1ee3c v\u1edbi t\u1ed1c \u0111\u1ed9 c\u1ee7a RAM v\u00e0 b\u1ed9 x\u1eed l\u00fd. V\u00ec v\u1eady, vi\u1ec7c truy xu\u1ea5t d\u1eef li\u1ec7u t\u1eeb \u1ed5 c\u1ee9ng m\u1ea5t nhi\u1ec1u th\u1eddi gian. Tuy nhi\u00ean, b\u1ed9 nh\u1edb cache th\u00ec kh\u00e1c, v\u00ec \u0111\u00e2y l\u00e0 m\u1ed9t lo\u1ea1i b\u1ed9 nh\u1edb t\u1ed1c \u0111\u1ed9 cao. Lo\u1ea1i b\u1ed9 nh\u1edb n\u00e0y c\u00f3 dung l\u01b0\u1ee3ng h\u1ea1n ch\u1ebf v\u00e0 ch\u1ec9 c\u00f3 th\u1ec3 l\u01b0u tr\u1eef nh\u1eefng d\u1eef li\u1ec7u th\u01b0\u1eddng xuy\u00ean \u0111\u01b0\u1ee3c truy c\u1eadp.<\/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>C\u00e1c lo\u1ea1i caching<\/h2><p>Trong ph\u1ea7n n\u00e0y, ch\u00fang ta s\u1ebd t\u00ecm hi\u1ec3u c\u00e1c lo\u1ea1i caching kh\u00e1c nhau v\u00e0 \u1ee9ng d\u1ee5ng c\u1ee7a ch\u00fang.<\/p><ul><li><h3>Caching ph\u00eda m\u00e1y kh\u00e1ch<\/h3>Trong ph\u01b0\u01a1ng ph\u00e1p n\u00e0y, d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef \u1edf ph\u00eda m\u00e1y kh\u00e1ch, th\u01b0\u1eddng l\u00e0 trong tr\u00ecnh duy\u1ec7t web. Tr\u00ecnh duy\u1ec7t c\u00f3 th\u1ec3 l\u01b0u c\u00e1c b\u1ea3n sao c\u1ee7a trang web v\u00e0 t\u00e0i nguy\u00ean nh\u01b0 h\u00ecnh \u1ea3nh v\u00e0o b\u1ed9 nh\u1edb cache \u0111\u1ec3 hi\u1ec3n th\u1ecb trong nh\u1eefng l\u1ea7n truy c\u1eadp sau m\u00e0 kh\u00f4ng c\u1ea7n truy xu\u1ea5t l\u1ea1i t\u1eeb m\u00e1y ch\u1ee7. V\u00ed d\u1ee5, b\u1eb1ng c\u00e1ch ki\u1ec3m tra th\u1eddi \u0111i\u1ec3m trang \u0111\u01b0\u1ee3c s\u1eeda \u0111\u1ed5i l\u1ea7n cu\u1ed1i, tr\u00ecnh duy\u1ec7t c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh phi\u00ean b\u1ea3n \u0111\u00e3 l\u01b0u trong cache c\u00f3 c\u00f2n h\u1ee3p l\u1ec7 hay kh\u00f4ng.<\/li><li><h3>Caching ph\u00eda m\u00e1y ch\u1ee7<\/h3>Trong ph\u01b0\u01a1ng ph\u00e1p n\u00e0y, d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef \u1edf ph\u00eda m\u00e1y ch\u1ee7 \u0111\u1ec3 ph\u1ea3n h\u1ed3i y\u00eau c\u1ea7u nhanh h\u01a1n v\u00e0 gi\u1ea3m t\u1ea3i cho m\u00e1y ch\u1ee7 c\u0169ng nh\u01b0 m\u1ea1ng. M\u1ed9t v\u00ed d\u1ee5 l\u00e0 s\u1eed d\u1ee5ng m\u00e1y ch\u1ee7 proxy caching, c\u00f3 th\u1ec3 l\u01b0u n\u1ed9i dung \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u v\u00e0 cung c\u1ea5p c\u00f9ng n\u1ed9i dung \u0111\u00f3 cho nh\u1eefng ng\u01b0\u1eddi d\u00f9ng kh\u00e1c khi c\u1ea7n. DynaCache trong IBM WebSphere Application Server l\u00e0 m\u1ed9t v\u00ed d\u1ee5 kh\u00e1c v\u1ec1 c\u01a1 ch\u1ebf caching ph\u00eda m\u00e1y ch\u1ee7.<\/li><li><h3>Caching to\u00e0n trang<\/h3>Trong ph\u01b0\u01a1ng ph\u00e1p n\u00e0y, m\u1ed9t b\u1ea3n sao c\u1ee7a to\u00e0n b\u1ed9 trang web \u0111\u00e3 \u0111\u01b0\u1ee3c k\u1ebft xu\u1ea5t s\u1ebd \u0111\u01b0\u1ee3c l\u01b0u l\u1ea1i, nh\u1edd \u0111\u00f3 \u1edf c\u00e1c y\u00eau c\u1ea7u ti\u1ebfp theo, trang c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c ph\u00e2n ph\u1ed1i m\u00e0 kh\u00f4ng c\u1ea7n th\u1ef1c thi l\u1ea1i to\u00e0n b\u1ed9 c\u00e1c quy tr\u00ecnh t\u1ea1o n\u1ed9i dung. Tuy nhi\u00ean, ph\u01b0\u01a1ng ph\u00e1p n\u00e0y ch\u1ec9 ph\u00f9 h\u1ee3p khi n\u1ed9i dung trang c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c l\u01b0u v\u00e0o cache v\u00e0 c\u00e1c thay \u0111\u1ed5i \u0111\u1ed1i v\u1edbi n\u1ed9i dung \u0111\u01b0\u1ee3c qu\u1ea3n l\u00fd \u0111\u00fang c\u00e1ch.<\/li><li><h3>Caching t\u1eebng ph\u1ea7n<\/h3>Trong ph\u01b0\u01a1ng ph\u00e1p n\u00e0y, c\u00e1c ph\u1ea7n c\u1ee5 th\u1ec3 c\u1ee7a trang \u0111\u01b0\u1ee3c l\u01b0u v\u00e0o cache m\u1ed9t c\u00e1ch \u0111\u1ed9c l\u1eadp thay v\u00ec l\u01b0u to\u00e0n b\u1ed9 trang. C\u00e1ch ti\u1ebfp c\u1eadn n\u00e0y h\u1eefu \u00edch khi m\u1ed9t trang ch\u1ee9a c\u1ea3 n\u1ed9i dung t\u0129nh l\u1eabn n\u1ed9i dung \u0111\u1ed9ng. B\u1eb1ng c\u00e1ch l\u01b0u v\u00e0o cache nh\u1eefng ph\u1ea7n c\u00f3 th\u1ec3 l\u01b0u tr\u1eef, hi\u1ec7u su\u1ea5t trang c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c c\u1ea3i thi\u1ec7n m\u00e0 kh\u00f4ng c\u1ea7n l\u01b0u to\u00e0n b\u1ed9 trang nh\u01b0 m\u1ed9t kh\u1ed1i duy nh\u1ea5t.<\/li><li><h3>Caching n\u1ed9i dung t\u0129nh<\/h3>Ph\u01b0\u01a1ng ph\u00e1p n\u00e0y \u0111\u01b0\u1ee3c d\u00f9ng \u0111\u1ec3 l\u01b0u tr\u1eef nh\u1eefng n\u1ed9i dung \u00edt thay \u0111\u1ed5i, ch\u1eb3ng h\u1ea1n nh\u01b0 h\u00ecnh \u1ea3nh \u0111\u1ed3 h\u1ecda v\u00e0 t\u1ec7p v\u0103n b\u1ea3n. V\u00ec lo\u1ea1i n\u1ed9i dung n\u00e0y th\u01b0\u1eddng kh\u00f4ng c\u1ea7n c\u1eadp nh\u1eadt th\u01b0\u1eddng xuy\u00ean, vi\u1ec7c l\u01b0u m\u1ed9t b\u1ea3n sao trong cache c\u00f3 th\u1ec3 gi\u1ea3m s\u1ed1 l\u01b0\u1ee3ng y\u00eau c\u1ea7u g\u1eedi \u0111\u1ebfn m\u00e1y ch\u1ee7 g\u1ed1c v\u00e0 r\u00fat ng\u1eafn th\u1eddi gian t\u1ea3i trang.<\/li><li><h3>Caching n\u1ed9i dung \u0111\u1ed9ng<\/h3>Trong ph\u01b0\u01a1ng ph\u00e1p n\u00e0y, nh\u1eefng n\u1ed9i dung c\u00f3 th\u1ec3 thay \u0111\u1ed5i th\u01b0\u1eddng xuy\u00ean ho\u1eb7c \u0111\u01b0\u1ee3c t\u1ea1o ra d\u1ef1a tr\u00ean th\u00f4ng tin v\u00e0 \u0111i\u1ec1u ki\u1ec7n c\u1ee7a ng\u01b0\u1eddi d\u00f9ng s\u1ebd \u0111\u01b0\u1ee3c l\u01b0u v\u00e0o cache. V\u00ec n\u1ed9i dung \u0111\u1ed9ng c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c c\u00e1 nh\u00e2n h\u00f3a, vi\u1ec7c qu\u1ea3n l\u00fd t\u00ednh h\u1ee3p l\u1ec7 c\u1ee7a cache v\u00e0 x\u00e1c \u0111\u1ecbnh th\u1eddi \u0111i\u1ec3m c\u1ea7n c\u1eadp nh\u1eadt \u0111\u1eb7c bi\u1ec7t quan tr\u1ecdng. DynaCache trong IBM WebSphere Application Server l\u00e0 m\u1ed9t v\u00ed d\u1ee5 v\u1ec1 gi\u1ea3i ph\u00e1p caching n\u1ed9i dung \u0111\u1ed9ng.<\/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>T\u1ea1i sao n\u00ean s\u1eed d\u1ee5ng caching?<\/h2><p>Nh\u01b0 \u0111\u00e3 \u0111\u1ec1 c\u1eadp \u1edf tr\u00ean, m\u1ed9t trong nh\u1eefng l\u00fd do s\u1eed d\u1ee5ng caching l\u00e0 t\u0103ng t\u1ed1c \u0111\u1ed9 truy c\u1eadp v\u00e0o d\u1eef li\u1ec7u th\u01b0\u1eddng xuy\u00ean \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng. Ngo\u00e0i ra, caching c\u00f2n gi\u1ea3m t\u1ea3i x\u1eed l\u00fd cho m\u00e1y ch\u1ee7. Nh\u01b0ng t\u1ea1i sao l\u1ea1i nh\u01b0 v\u1eady?<\/p><p>Khi h\u1ec7 th\u1ed1ng th\u01b0\u1eddng xuy\u00ean c\u1ea7n m\u1ed9t ph\u1ea7n d\u1eef li\u1ec7u c\u1ee5 th\u1ec3 v\u00e0 ph\u1ea3i truy xu\u1ea5t n\u00f3 t\u1eeb b\u1ed9 l\u01b0u tr\u1eef, vi\u1ec7c n\u00e0y kh\u00f4ng ch\u1ec9 t\u1ed1n nhi\u1ec1u th\u1eddi gian h\u01a1n m\u00e0 c\u00f2n \u0111\u00f2i h\u1ecfi CPU v\u00e0 c\u00e1c t\u00e0i nguy\u00ean h\u1ec7 th\u1ed1ng kh\u00e1c ph\u1ea3i x\u1eed l\u00fd th\u00eam. Tuy nhi\u00ean, n\u1ebfu d\u1eef li\u1ec7u n\u00e0y c\u00f3 s\u1eb5n trong cache, h\u1ec7 th\u1ed1ng c\u00f3 th\u1ec3 truy c\u1eadp cache v\u00e0 l\u1ea5y d\u1eef li\u1ec7u m\u00e0 kh\u00f4ng c\u1ea7n truy c\u1eadp l\u1ea1i b\u1ed9 l\u01b0u tr\u1eef.<\/p><p>Caching c\u00f2n mang l\u1ea1i nh\u1eefng l\u1ee3i \u00edch kh\u00e1c, d\u1ec5 hi\u1ec3u h\u01a1n qua m\u1ed9t v\u00ed d\u1ee5. Gi\u1ea3 s\u1eed b\u1ea1n c\u00f3 10 GB d\u1eef li\u1ec7u c\u1ea7n \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef. V\u00ec b\u1ed9 x\u1eed l\u00fd nhanh h\u01a1n nhi\u1ec1u so v\u1edbi h\u1ec7 th\u1ed1ng l\u01b0u tr\u1eef, h\u1ec7 th\u1ed1ng l\u01b0u tr\u1eef c\u00f3 th\u1ec3 kh\u00f4ng ghi \u0111\u01b0\u1ee3c d\u1eef li\u1ec7u n\u00e0y v\u1edbi c\u00f9ng t\u1ed1c \u0111\u1ed9. \u0110\u00e2y ch\u00ednh l\u00e0 l\u00fac caching ph\u00e1t huy t\u00e1c d\u1ee5ng. B\u1ed9 x\u1eed l\u00fd g\u1eedi d\u1eef li\u1ec7u \u0111\u1ebfn cache, cho ph\u00e9p cache chuy\u1ec3n d\u1eef li\u1ec7u \u0111\u1ebfn h\u1ec7 th\u1ed1ng l\u01b0u tr\u1eef v\u1edbi t\u1ed1c \u0111\u1ed9 ph\u00f9 h\u1ee3p. Nh\u1edd \u0111\u00f3, b\u1ed9 x\u1eed l\u00fd c\u00f3 th\u1ec3 ti\u1ebfp t\u1ee5c l\u00e0m vi\u1ec7c m\u00e0 kh\u00f4ng b\u1ecb tr\u00ec ho\u00e3n kh\u00f4ng c\u1ea7n thi\u1ebft, \u0111\u1ed3ng th\u1eddi \u0111\u1ea3m b\u1ea3o d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef ch\u00ednh x\u00e1c.<\/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>Hosting \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn hi\u1ec7u su\u1ea5t website nh\u01b0 th\u1ebf n\u00e0o?<\/h2><p>Caching c\u00f3 th\u1ec3 c\u1ea3i thi\u1ec7n \u0111\u00e1ng k\u1ec3 hi\u1ec7u su\u1ea5t website, nh\u01b0ng \u0111\u00f3 kh\u00f4ng ph\u1ea3i l\u00e0 y\u1ebfu t\u1ed1 duy nh\u1ea5t quy\u1ebft \u0111\u1ecbnh t\u1ed1c \u0111\u1ed9 t\u1ea3i c\u1ee7a website. H\u1ea1 t\u1ea7ng hosting c\u0169ng \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng. C\u00e1c t\u00e0i nguy\u00ean m\u00e1y ch\u1ee7 nh\u01b0 CPU, RAM, t\u1ed1c \u0111\u1ed9 l\u01b0u tr\u1eef v\u00e0 hi\u1ec7u su\u1ea5t m\u1ea1ng c\u00f3 th\u1ec3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u1ed1c \u0111\u1ed9 x\u1eed l\u00fd y\u00eau c\u1ea7u, \u0111\u1eb7c bi\u1ec7t khi website c\u00f3 l\u01b0u l\u01b0\u1ee3ng truy c\u1eadp cao.<\/p><p>Ngay c\u1ea3 khi c\u00f3 chi\u1ebfn l\u01b0\u1ee3c caching hi\u1ec7u qu\u1ea3, hi\u1ec7u su\u1ea5t website v\u1eabn c\u00f3 th\u1ec3 k\u00e9m n\u1ebfu m\u00f4i tr\u01b0\u1eddng hosting kh\u00f4ng x\u1eed l\u00fd \u0111\u01b0\u1ee3c kh\u1ed1i l\u01b0\u1ee3ng c\u00f4ng vi\u1ec7c c\u1ee7a trang m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3. L\u1ef1a ch\u1ecdn d\u1ecbch v\u1ee5 hosting c\u00f3 \u0111\u1ee7 t\u00e0i nguy\u00ean v\u00e0 hi\u1ec7u su\u1ea5t \u1ed5n \u0111\u1ecbnh c\u00f3 th\u1ec3 gi\u00fap gi\u1ea3m th\u1eddi gian ph\u1ea3n h\u1ed3i c\u1ee7a m\u00e1y ch\u1ee7 v\u00e0 c\u1ea3i thi\u1ec7n tr\u1ea3i nghi\u1ec7m ng\u01b0\u1eddi d\u00f9ng. V\u00ec v\u1eady, n\u1ebfu b\u1ea1n mu\u1ed1n c\u1ea3i thi\u1ec7n t\u1ed1c \u0111\u1ed9 v\u00e0 hi\u1ec7u su\u1ea5t website, vi\u1ec7c t\u00ecm hi\u1ec3u c\u00e1c g\u00f3i <a href=\"\/vi\/webhosting\/\">web hosting<\/a> \u0111\u00e1p \u1ee9ng nhu c\u1ea7u c\u1ee7a trang web c\u00f3 th\u1ec3 l\u00e0 m\u1ed9t b\u01b0\u1edbc hi\u1ec7u qu\u1ea3 b\u00ean c\u1ea1nh vi\u1ec7c \u00e1p d\u1ee5ng c\u00e1c k\u1ef9 thu\u1eadt t\u1ed1i \u01b0u h\u00f3a.<\/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>Caching ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o?<\/h2><p>Caching c\u00f3 nhi\u1ec1u lo\u1ea1i kh\u00e1c nhau v\u00e0 l\u00e0 m\u1ed9t h\u00ecnh th\u1ee9c l\u01b0u tr\u1eef. Khi d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u, cache s\u1ebd \u0111\u01b0\u1ee3c ki\u1ec3m tra tr\u01b0\u1edbc khi d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c truy xu\u1ea5t t\u1eeb \u1ed5 c\u1ee9ng. Tuy nhi\u00ean, v\u00ec b\u1ed9 nh\u1edb cache c\u00f3 dung l\u01b0\u1ee3ng h\u1ea1n ch\u1ebf, kh\u00f4ng ph\u1ea3i to\u00e0n b\u1ed9 d\u1eef li\u1ec7u h\u1ec7 th\u1ed1ng \u0111\u1ec1u c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c l\u01b0u trong \u0111\u00f3. Do \u0111\u00f3, h\u1ec7 th\u1ed1ng ph\u1ea3i x\u00e1c \u0111\u1ecbnh d\u1eef li\u1ec7u n\u00e0o n\u00ean \u0111\u01b0\u1ee3c l\u01b0u v\u00e0o cache.<\/p><p>M\u1eb7t kh\u00e1c, khi cache \u0111\u00e3 \u0111\u1ea7y v\u00e0 c\u1ea7n th\u00eam d\u1eef li\u1ec7u m\u1edbi \u0111\u01b0\u1ee3c truy c\u1eadp th\u01b0\u1eddng xuy\u00ean, h\u1ec7 th\u1ed1ng ph\u1ea3i quy\u1ebft \u0111\u1ecbnh d\u1eef li\u1ec7u hi\u1ec7n c\u00f3 n\u00e0o c\u1ea7n \u0111\u01b0\u1ee3c lo\u1ea1i b\u1ecf. C\u00f3 nhi\u1ec1u thu\u1eadt to\u00e1n kh\u00e1c nhau ph\u1ee5c v\u1ee5 m\u1ee5c \u0111\u00edch n\u00e0y, v\u00e0 ch\u00fang \u0111\u00e1nh gi\u00e1 xem d\u1eef li\u1ec7u n\u00e0o \u00edt c\u00f3 kh\u1ea3 n\u0103ng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng l\u1ea1i nh\u1ea5t.<\/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>Cache miss l\u00e0 g\u00ec?<\/h2><p>Khi m\u1ed9t \u1ee9ng d\u1ee5ng y\u00eau c\u1ea7u c\u00e1c lo\u1ea1i d\u1eef li\u1ec7u kh\u00e1c nhau, c\u00e1c y\u00eau c\u1ea7u s\u1ebd \u0111\u01b0\u1ee3c g\u1eedi \u0111\u1ebfn cache. N\u1ebfu d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u kh\u00f4ng c\u00f3 trong cache, s\u1ed1 l\u1ea7n cache miss s\u1ebd t\u0103ng l\u00ean. \u0110i\u1ec1u n\u00e0y c\u00f3 ngh\u0129a l\u00e0 h\u1ec7 th\u1ed1ng \u0111\u00e3 truy c\u1eadp cache nhi\u1ec1u l\u1ea7n, nh\u01b0ng v\u00ec d\u1eef li\u1ec7u c\u1ea7n thi\u1ebft kh\u00f4ng c\u00f3 s\u1eb5n, h\u1ec7 th\u1ed1ng ph\u1ea3i truy xu\u1ea5t n\u00f3 t\u1eeb b\u1ed9 l\u01b0u tr\u1eef.<\/p><p>\u0110i\u1ec1u n\u00e0y l\u00e0m gi\u1ea3m hi\u1ec7u su\u1ea5t h\u1ec7 th\u1ed1ng. \u0110\u1ec3 kh\u1eafc ph\u1ee5c v\u1ea5n \u0111\u1ec1 n\u00e0y, c\u00f3 th\u1ec3 t\u0103ng dung l\u01b0\u1ee3ng cache.<\/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>RAID controller l\u00e0 g\u00ec?<\/h2><p>RAID controller l\u00e0 m\u1ed9t th\u00e0nh ph\u1ea7n ph\u1ea7n c\u1ee9ng trong m\u00e1y ch\u1ee7 \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1eb7c bi\u1ec7t \u0111\u1ec3 c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t caching v\u00e0 l\u01b0u tr\u1eef. V\u1edbi s\u1ef1 h\u1ed7 tr\u1ee3 c\u1ee7a b\u1ed9 nh\u1edb flash, cache c\u1ee7a n\u00f3 cung c\u1ea5p th\u00eam dung l\u01b0\u1ee3ng l\u01b0u tr\u1eef v\u00e0 c\u1ea3i thi\u1ec7n \u0111\u00e1ng k\u1ec3 hi\u1ec7u su\u1ea5t m\u00e1y ch\u1ee7.<\/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>Nh\u1eefng th\u00e1ch th\u1ee9c c\u1ee7a caching<\/h2><ul><li>Cache c\u1ee5c b\u1ed9: Vi\u1ec7c l\u01b0u tr\u1eef c\u00e1c phi\u00ean b\u1ea3n kh\u00e1c nhau c\u1ee7a c\u00f9ng m\u1ed9t d\u1eef li\u1ec7u tr\u00ean nhi\u1ec1u h\u1ec7 th\u1ed1ng c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn t\u00ecnh tr\u1ea1ng d\u1eef li\u1ec7u kh\u00f4ng nh\u1ea5t qu\u00e1n v\u00e0 l\u00e0m gi\u1ea3m hi\u1ec7u qu\u1ea3 caching.<\/li><li>V\u1ea5n \u0111\u1ec1 nh\u1ea5t qu\u00e1n cache (Cache Coherence): Khi d\u1eef li\u1ec7u thay \u0111\u1ed5i trong m\u1ed9t cache, vi\u1ec7c gi\u1eef \u0111\u1ed3ng b\u1ed9 c\u00e1c b\u1ea3n sao t\u01b0\u01a1ng \u1ee9ng c\u1ee7a d\u1eef li\u1ec7u \u0111\u00f3 tr\u00ean nh\u1eefng cache kh\u00e1c tr\u1edf th\u00e0nh m\u1ed9t th\u00e1ch th\u1ee9c.<\/li><li>Cache Penetration: Hi\u1ec7n t\u01b0\u1ee3ng n\u00e0y x\u1ea3y ra khi d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u kh\u00f4ng t\u1ed3n t\u1ea1i trong c\u1ea3 cache l\u1eabn c\u01a1 s\u1edf d\u1eef li\u1ec7u g\u1ed1c. S\u1eed d\u1ee5ng Bloom filter c\u00f3 th\u1ec3 gi\u00fap gi\u1ea3m thi\u1ec3u v\u1ea5n \u0111\u1ec1 n\u00e0y.<\/li><li>Cache Avalanche: S\u1ef1 c\u1ed1 cache ho\u1eb7c vi\u1ec7c m\u1ed9t l\u01b0\u1ee3ng l\u1edbn m\u1ee5c trong cache h\u1ebft h\u1ea1n c\u00f9ng l\u00fac c\u00f3 th\u1ec3 khi\u1ebfn kh\u1ed1i l\u01b0\u1ee3ng y\u00eau c\u1ea7u kh\u1ed5ng l\u1ed3 d\u1ed3n v\u1ec1 c\u01a1 s\u1edf d\u1eef li\u1ec7u, c\u00f3 th\u1ec3 g\u00e2y gi\u00e1n \u0111o\u1ea1n. S\u1eed d\u1ee5ng c\u1ee5m cache (cache cluster) v\u00e0 c\u00e1c c\u00f4ng c\u1ee5 nh\u01b0 Hystrix c\u00f3 th\u1ec3 gi\u00fap h\u1ea1n ch\u1ebf v\u1ea5n \u0111\u1ec1 n\u00e0y.<\/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>K\u1ebft lu\u1eadn<\/h2><p>Caching l\u00e0 m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3 \u0111\u1ec3 c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t h\u1ec7 th\u1ed1ng, gi\u1ea3m th\u1eddi gian truy c\u1eadp d\u1eef li\u1ec7u v\u00e0 gi\u1ea3m t\u1ea3i x\u1eed l\u00fd cho m\u00e1y ch\u1ee7. T\u00f9y theo y\u00eau c\u1ea7u c\u1ee7a h\u1ec7 th\u1ed1ng, c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng c\u00e1c ph\u01b0\u01a1ng ph\u00e1p caching kh\u00e1c nhau \u0111\u1ec3 l\u01b0u tr\u1eef d\u1eef li\u1ec7u th\u01b0\u1eddng xuy\u00ean \u0111\u01b0\u1ee3c truy c\u1eadp v\u00e0 ph\u00e2n ph\u1ed1i d\u1eef li\u1ec7u nhanh h\u01a1n. Tuy nhi\u00ean, vi\u1ec7c l\u1ef1a ch\u1ecdn chi\u1ebfn l\u01b0\u1ee3c caching ph\u00f9 h\u1ee3p v\u00e0 qu\u1ea3n l\u00fd d\u1eef li\u1ec7u cache \u0111\u00fang c\u00e1ch l\u00e0 \u0111i\u1ec1u thi\u1ebft y\u1ebfu \u0111\u1ec3 duy tr\u00ec hi\u1ec7u su\u1ea5t v\u00e0 ng\u0103n ng\u1eeba c\u00e1c v\u1ea5n \u0111\u1ec1 nh\u01b0 cache miss, v\u1ea5n \u0111\u1ec1 nh\u1ea5t qu\u00e1n cache v\u00e0 cache avalanche. Hi\u1ec3u r\u00f5 c\u00e1ch caching ho\u1ea1t \u0111\u1ed9ng, c\u00e1c lo\u1ea1i caching v\u00e0 nh\u1eefng th\u00e1ch th\u1ee9c ti\u1ec1m \u1ea9n s\u1ebd gi\u00fap b\u1ea1n \u0111\u01b0a ra quy\u1ebft \u0111\u1ecbnh t\u1ed1t h\u01a1n khi thi\u1ebft k\u1ebf v\u00e0 t\u1ed1i \u01b0u h\u00f3a h\u1ec7 th\u1ed1ng.<\/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>C\u00e2u h\u1ecfi th\u01b0\u1eddng g\u1eb7p<\/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. C\u00e1c thu\u1eadt to\u00e1n lo\u1ea1i b\u1ecf cache ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o?<\/h3><p style=\"padding-left: 40px;\">C\u00e1c thu\u1eadt to\u00e1n lo\u1ea1i b\u1ecf cache x\u00e1c \u0111\u1ecbnh d\u1eef li\u1ec7u n\u00e0o c\u1ea7n \u0111\u01b0\u1ee3c x\u00f3a khi cache \u0111\u1ea1t \u0111\u1ebfn gi\u1edbi h\u1ea1n dung l\u01b0\u1ee3ng. C\u00e1c thu\u1eadt to\u00e1n nh\u01b0 LRU (Least Recently Used \u2013 \u00edt \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng g\u1ea7n \u0111\u00e2y nh\u1ea5t) v\u00e0 LFU (Least Frequently Used \u2013 \u00edt \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng th\u01b0\u1eddng xuy\u00ean nh\u1ea5t) l\u1ef1a ch\u1ecdn d\u1eef li\u1ec7u d\u1ef1a tr\u00ean m\u1ee9c \u0111\u1ed9 g\u1ea7n \u0111\u00e2y ho\u1eb7c t\u1ea7n su\u1ea5t d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c truy c\u1eadp.<\/p><p style=\"padding-left: 40px;\">Vi\u1ec7c s\u1eed d\u1ee5ng c\u1ea3 hai ph\u01b0\u01a1ng ph\u00e1p gi\u00fap c\u1ea3i thi\u1ec7n t\u00ednh b\u1ea3o m\u1eadt c\u1ee7a m\u00e1y ch\u1ee7 chuy\u00ean d\u1ee5ng v\u00e0 t\u00ednh s\u1eb5n s\u00e0ng c\u1ee7a d\u1ecbch v\u1ee5.<\/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. Nh\u1ea5t qu\u00e1n cache l\u00e0 g\u00ec v\u00e0 t\u1ea1i sao n\u00f3 quan tr\u1ecdng?<\/h3><p style=\"padding-left: 40px;\">Nh\u1ea5t qu\u00e1n cache \u0111\u1ea3m b\u1ea3o r\u1eb1ng nhi\u1ec1u b\u1ea3n sao \u0111\u01b0\u1ee3c l\u01b0u trong cache c\u1ee7a c\u00f9ng m\u1ed9t d\u1eef li\u1ec7u lu\u00f4n \u0111\u1ed3ng nh\u1ea5t khi c\u00f3 thay \u0111\u1ed5i x\u1ea3y ra. \u0110i\u1ec1u n\u00e0y \u0111\u1eb7c bi\u1ec7t quan tr\u1ecdng trong c\u00e1c h\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1n v\u00e0 m\u00f4i tr\u01b0\u1eddng \u0111a b\u1ed9 x\u1eed l\u00fd, n\u01a1i nhi\u1ec1u cache c\u00f3 th\u1ec3 l\u01b0u tr\u1eef b\u1ea3n sao c\u1ee7a c\u00f9ng m\u1ed9t d\u1eef li\u1ec7u.<\/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>H\u00e3y t\u01b0\u1edfng t\u01b0\u1ee3ng m\u1ed7i l\u1ea7n b\u1ea1n truy c\u1eadp m\u1ed9t website, n\u00f3 ph\u1ea3i x\u1eed l\u00fd l\u1ea1i to\u00e0n b\u1ed9 d\u1eef li\u1ec7u t\u1eeb \u0111\u1ea7u \u0111\u1ec3 t\u1ea3i h\u00ecnh \u1ea3nh, hi\u1ec3n th\u1ecb trang ho\u1eb7c truy xu\u1ea5t th\u00f4ng tin. \u0110i\u1ec1u n\u00e0y kh\u00f4ng ch\u1ec9 l\u00e0m t\u0103ng th\u1eddi gian ph\u1ea3n h\u1ed3i m\u00e0 c\u00f2n g\u00e2y th\u00eam \u00e1p l\u1ef1c l\u00ean m\u00e1y ch\u1ee7 v\u00e0 t\u00e0i nguy\u00ean [\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-3637","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>Caching l\u00e0 g\u00ec v\u00e0 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u1ed1c \u0111\u1ed9 website?<\/title>\n<meta name=\"description\" content=\"T\u00ecm hi\u1ec3u caching l\u00e0 g\u00ec, c\u00e1ch ho\u1ea1t \u0111\u1ed9ng, c\u00e1c lo\u1ea1i ch\u00ednh, l\u1ee3i \u00edch, th\u00e1ch th\u1ee9c th\u01b0\u1eddng g\u1eb7p v\u00e0 c\u00e1ch caching t\u0103ng t\u1ed1c website, c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t m\u00e1y ch\u1ee7.\" \/>\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\/vi\/blog\/what-is-caching-how-it-works-and-why-it-matters\/\" \/>\n<meta property=\"og:locale\" content=\"vi_VN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Caching l\u00e0 g\u00ec v\u00e0 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u1ed1c \u0111\u1ed9 website?\" \/>\n<meta property=\"og:description\" content=\"T\u00ecm hi\u1ec3u caching l\u00e0 g\u00ec, c\u00e1ch ho\u1ea1t \u0111\u1ed9ng, c\u00e1c lo\u1ea1i ch\u00ednh, l\u1ee3i \u00edch, th\u00e1ch th\u1ee9c th\u01b0\u1eddng g\u1eb7p v\u00e0 c\u00e1ch caching t\u0103ng t\u1ed1c website, c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t m\u00e1y ch\u1ee7.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/potenting.com\/vi\/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=\"2026-10-27T09:53:40+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=\"15 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/potenting.com\\\/vi\\\/blog\\\/what-is-caching-how-it-works-and-why-it-matters\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/potenting.com\\\/vi\\\/blog\\\/what-is-caching-how-it-works-and-why-it-matters\\\/\"},\"author\":{\"name\":\"Nina Ash\",\"@id\":\"https:\\\/\\\/potenting.com\\\/blog\\\/#\\\/schema\\\/person\\\/743a7b4616c4d55a0ed17f5ac379fcdb\"},\"headline\":\"Caching l\u00e0 g\u00ec? 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