{"id":15908,"date":"2020-01-15T17:11:44","date_gmt":"2020-01-15T10:11:44","guid":{"rendered":"https:\/\/blog.tinohost.com\/?p=3045"},"modified":"2025-06-11T15:58:54","modified_gmt":"2025-06-11T08:58:54","slug":"so-sanh-memcached-va-redis","status":"publish","type":"post","link":"https:\/\/tino.vn\/blog\/so-sanh-memcached-va-redis\/","title":{"rendered":"Memcached v\u00e0 Redis l\u00e0 g\u00ec ? So s\u00e1nh Redis v\u1edbi Memcached &#8211; cache n\u00e0o t\u1ed1t h\u01a1n?"},"content":{"rendered":"\n<h2 id=\"Memcached_v\u00e0_Redis_l\u00e0_g\u00ec?\"><strong>Memcached v\u00e0 Redis l\u00e0 g\u00ec?<\/strong><\/h2>\n\n\n\n<h3 id=\"&nbsp;B\u1ed9_nh\u1edb_ng\u1eafn_h\u1ea1n_cho_c\u00e1c_\u1ee9ng_d\u1ee5ng:_Memcached\"><strong>&nbsp;B\u1ed9 nh\u1edb ng\u1eafn h\u1ea1n cho c\u00e1c \u1ee9ng d\u1ee5ng: Memcached<\/strong><\/h3>\n\n\n\n<p>Trong c\u00f4ng ngh\u1ec7 th\u00f4ng tin, \u0111\u00e2y l\u00e0 m\u1ed9t l\u00e0 in-memory cache, <a href=\"https:\/\/tino.vn\/blog\/database-la-gi\/\" target=\"_blank\" rel=\"noopener noreferrer\">l\u01b0u tr\u1eef d\u1eef li\u1ec7u<\/a> d\u01b0\u1edbi d\u1ea1ng key-value.<br>Memcached l\u00e0 m\u1ed9t h\u1ec7 th\u1ed1ng l\u01b0u tr\u1eef b\u1ed9 nh\u1edb ph\u00e2n t\u00e1n m\u00e3 ngu\u1ed3n m\u1edf \u0111\u1eb7c bi\u1ec7t. Nh\u1eefng th\u00f4ng tin \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef trong Memcached l\u00e0 b\u1ea3n sao c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng (objects) v\u00e0 d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c ng\u01b0\u1eddi d\u00f9ng truy c\u1eadp nhi\u1ec1u l\u1ea7n.<br>Ban \u0111\u1ea7u, \u0111\u00e2y l\u00e0 m\u1ed9t \u1ee9ng d\u1ee5ng Linux. Tuy nhi\u00ean, v\u1edbi t\u00ednh ch\u1ea5t l\u00e0 m\u00e3 ngu\u1ed3n m\u1edf, Memcached \u0111\u01b0\u1ee3c c\u00e1c nh\u00e0 l\u1eadp tr\u00ecnh ph\u00e1t tri\u1ec3n cho n\u1ec1n t\u1ea3ng Windows s\u1eed d\u1ee5ng.<\/p>\n\n\n\n<h4 id=\"M\u1ee5c_\u0111\u00edch_ho\u1ea1t_\u0111\u1ed9ng_c\u1ee7a_Memcached_l\u00e0_g\u00ec?\"><strong>M\u1ee5c \u0111\u00edch ho\u1ea1t \u0111\u1ed9ng c\u1ee7a Memcached l\u00e0 g\u00ec?<\/strong><\/h4>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2020\/01\/memcached.jpg\" alt=\"memcached\" class=\"wp-image-3051\" title=\"\"><\/figure><\/div>\n\n\n\n<p>Khi ng\u01b0\u1eddi d\u00f9ng truy c\u1eadp v\u00e0o m\u1ed9t website, h\u1ecd s\u1ebd g\u1eedi request t\u1edbi Apache Webserver.&nbsp; L\u00fac n\u00e0y, Apache s\u1ebd truy v\u1ea5n c\u01a1 s\u1edf d\u1eef li\u1ec7u MySQL \u0111\u1ec3 l\u1ea5y d\u1eef li\u1ec7u tr\u1ea3 v\u1ec1 cho ng\u01b0\u1eddi d\u00f9ng. Khi s\u1ed1 l\u01b0\u1ee3ng truy c\u1eadp t\u0103ng l\u00ean \u0111\u1ebfn m\u1ee9c qu\u00e1 t\u1ea3i, th\u1eddi gian x\u1eed l\u00fd m\u1ed7i request s\u1ebd ph\u1ea3i t\u0103ng l\u00ean, th\u00f4ng th\u01b0\u1eddng l\u00e0 5 gi\u00e2y. Nguy\u00ean nh\u00e2n l\u00e0 do Apache v\u00e0 MySQL <a href=\"https:\/\/tino.vn\/blog\/server-va-cac-loai-may-chu-pho-bien\/\" target=\"_blank\" rel=\"noopener noreferrer\">server<\/a> ph\u1ea3i x\u1eed l\u00fd l\u01b0\u1ee3ng l\u1edbn d\u1eef li\u1ec7u trong th\u1eddi gian ng\u1eafn n\u00ean kh\u00f4ng th\u1ec3 \u0111\u00e1p \u1ee9ng nhanh y\u00eau c\u1ea7u c\u1ee7a ng\u01b0\u1eddi d\u00f9ng. Memcached \u0111\u00e3 xu\u1ea5t hi\u1ec7n v\u00e0 gi\u1ea3i quy\u1ebft cho b\u00e0i to\u00e1n kh\u00f3 nh\u1eb1n n\u00e0y.<br><br><span style=\"font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif; text-align: center;\">Memcached ho\u1ea1t \u0111\u1ed9ng v\u1edbi m\u1ee5c \u0111\u00edch ch\u00ednh l\u00e0 t\u0103ng t\u1ed1c \u0111\u1ed9 \u1ee9ng d\u1ee5ng web b\u1eb1ng c\u00e1ch truy v\u1ea5n c\u01a1 s\u1edf d\u1eef li\u1ec7u b\u1ed9 nh\u1edb \u0111\u1ec7m, n\u1ed9i dung, ho\u1eb7c k\u1ebft qu\u1ea3 t\u00ednh to\u00e1n kh\u00e1c.<\/span><br>S\u1eed d\u1ee5ng memcached \u0111\u1ec3 t\u0103ng t\u1ed1c h\u1ec7 th\u1ed1ng server s\u1ebd r\u00fat ng\u1eafn th\u1eddi gian ng\u01b0\u1eddi truy c\u1eadp ch\u1edd \u0111\u1ee3i \u0111\u1ec3 web t\u1ea3i xong. M\u00f4t trang web t\u1ea3i nhanh s\u1ebd khi\u1ebfn ng\u01b0\u1eddi truy c\u1eadp c\u1ea3m th\u1ea5y tho\u1ea3i m\u00e1i. N\u1ebfu trang n\u00e0y l\u00e0 website b\u00e1n h\u00e0ng, t\u1ed1c \u0111\u1ed9 t\u1ea3i trang nhanh s\u1ebd g\u00f3p ph\u1ea7n kh\u00f4ng nh\u1ecf v\u00e0o vi\u1ec7c t\u0103ng t\u1ec9 l\u1ec7 chuy\u1ec3n \u0111\u1ed5i, n\u00e2ng cao doanh thu b\u00e1n h\u00e0ng tr\u00ean web. \u0110\u00e2y l\u00e0 \u0111i\u1ec3m Memcached thuy\u1ebft ph\u1ee5c kh\u00e1 nhi\u1ec1u doanh nghi\u1ec7p th\u1eddi 4.0 &#8211; khi m\u00e0 90% doanh nghi\u1ec7p \u0111\u1ec1u ph\u1ea3i c\u00f3 website b\u00e1n h\u00e0ng.<\/p>\n\n\n\n<h4 id=\"S\u01a1_\u0111\u1ed3_ho\u1ea1t_\u0111\u1ed9ng_Memcached\"><strong>S\u01a1 \u0111\u1ed3 ho\u1ea1t \u0111\u1ed9ng Memcached<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\"><li>\u0110\u1ed1i v\u1edbi request \u0111\u1ea7u ti\u00ean:<\/li><\/ul>\n\n\n\n<p>Truy c\u1eadp v\u00e0o c\u01a1 s\u1edf d\u1eef li\u1ec7u, server s\u1ebd tr\u1ea3 l\u1ea1i k\u1ebft qu\u1ea3 cho User nh\u01b0 th\u00f4ng th\u01b0\u1eddng. \u0110\u1ed3ng th\u1eddi, server c\u0169ng tr\u1ea3 d\u1eef li\u1ec7u v\u00e0o Memcached.<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>\u0110\u1ed1i v\u1edbi c\u00e1c request l\u1ea7n sau:<\/li><\/ul>\n\n\n\n<p>Truy c\u1eadp l\u1ea7n sau, server kh\u00f4ng ph\u1ea3i l\u00e0m vi\u1ec7c n\u1eefa. Thay v\u00e0o \u0111\u00f3, d\u1eef li\u1ec7u s\u1ebd \u0111\u01b0\u1ee3c t\u1ef1 \u0111\u1ed9ng \u0111\u01b0a t\u1eeb Memcached tr\u1ea3 l\u1ea1i cho User. Thao t\u00e1c n\u00e0y gi\u00fap server &#8220;nh\u1eb9 g\u00e1nh&#8221; \u0111\u01b0\u1ee3c m\u1ed9t l\u01b0\u1ee3ng l\u1edbn c\u00f4ng vi\u1ec7c ph\u1ea3i l\u00e0m. Do \u0111\u00f3, website s\u1ebd t\u1ea3i nhanh h\u01a1n 70% so v\u1edbi tr\u01b0\u1edbc \u0111\u00e2y.<\/p>\n\n\n\n<div class=\"wp-block-image size-full wp-image-3049\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2020\/01\/so_do_hoat_dong.png\" alt=\"memcached\" class=\"wp-image-3049\" title=\"\"><figcaption>S\u01a1 \u0111\u1ed3 ho\u1ea1t \u0111\u1ed9ng Memcached<\/figcaption><\/figure><\/div>\n\n\n\n<p><br>Hi\u1ec3u \u0111\u01a1n gi\u1ea3n, Memcached \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 t\u0103ng t\u1ed1c c\u00e1c \u1ee9ng d\u1ee5ng web \u0111\u1ed9ng b\u1eb1ng c\u00e1ch gi\u1ea3m t\u1ea3i c\u01a1 s\u1edf d\u1eef li\u1ec7u. M\u1ed7i khi y\u00eau c\u1ea7u c\u01a1 s\u1edf d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n, Memcached h\u1ed7 tr\u1ee3 th\u00eam t\u1ea3i cho server v\u1edbi c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef trong b\u1ed9 nh\u1edb \u0111\u1ed9ng.<\/p>\n\n\n\n<h3 id=\"Kho_l\u01b0u_tr\u1eef_d\u1eef_li\u1ec7u_trong_b\u1ed9_nh\u1edb:_Redis\"><strong>Kho l\u01b0u tr\u1eef d\u1eef li\u1ec7u trong b\u1ed9 nh\u1edb: Redis<\/strong><\/h3>\n\n\n\n<p>Redis l\u00e0 t\u1eeb vi\u1ebft t\u1eaft c\u1ee7a c\u1ee5m <strong>Remote Dictionary Server<\/strong> (t\u1ea1m d\u1ecbch: <em>M\u00e1y ch\u1ee7 t\u1eeb \u0111i\u1ec3n t\u1eeb xa).<\/em><br>Trong c\u00f4ng ngh\u1ec7 th\u00f4ng tin, Redis l\u00e0 h\u1ec7 th\u1ed1ng <span style=\"font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif;\">c\u01a1 s\u1edf d\u1eef li\u1ec7u NoSQL, l\u01b0u tr\u1eef d\u1eef li\u1ec7u v\u1edbi d\u1ea1ng KEY-VALUE tr\u00ean b\u1ed9 nh\u1edb RAM c\u1ee7a m\u00e1y ch\u1ee7.&nbsp;<\/span><br>Theo \u0111\u1ecbnh ngh\u0129a th\u00f4ng th\u01b0\u1eddng, <span style=\"font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif;\">Redis l\u00e0 m\u1ed9t kho l\u01b0u tr\u1eef d\u1eef li\u1ec7u m\u1ea1nh m\u1ebd v\u00e0 n\u1ed5i ti\u1ebfng, n\u1ed5i b\u1eadt v\u1ec1 t\u1ed1c \u0111\u1ed9 truy xu\u1ea5t nhanh (do truy xu\u1ea5t data tr\u00ean RAM). Nh\u1edd c\u01a1 ch\u1ebf sao l\u01b0u d\u1eef li\u1ec7u xu\u1ed1ng \u1ed5 c\u1ee9ng, Redis v\u1eabn \u0111\u1ea3m b\u1ea3o \u0111\u01b0\u1ee3c d\u1eef li\u1ec7u kh\u00f4ng b\u1ecb m\u1ea5t \u0111i d\u00f9 truy xu\u1ea5t nhanh.&nbsp;<\/span><br>\u0110\u00e2y l\u00e0 m\u1ed9t ph\u1ea7n m\u1ec1m \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 h\u1ed7 tr\u1ee3 cho m\u00e1y ch\u1ee7 linux. Ng\u01b0\u1eddi d\u00f9ng d\u1ec5 d\u00e0ng c\u00e0i \u0111\u1eb7t Redis tr\u00ean Centos, Ubuntu, Debian \u2026<\/p>\n\n\n\n<h4 id=\"Redis_ra_\u0111\u1eddi_nh\u01b0_th\u1ebf_n\u00e0o?\"><strong>Redis ra \u0111\u1eddi nh\u01b0 th\u1ebf n\u00e0o?<\/strong><\/h4>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2020\/01\/redis.jpg\" alt=\"redis\" class=\"wp-image-3052\" title=\"\"><\/figure><\/div>\n\n\n\n<p>Salvatore Sanfilippo kh\u1edfi nghi\u1ec7p t\u1ea1i \u00dd.&nbsp; Server c\u1ee7a \u00f4ng nh\u1eadn l\u01b0\u1ee3ng l\u1edbn th\u00f4ng tin t\u1eeb nhi\u1ec1u trang web kh\u00e1c nhau th\u00f4ng qua JavaScript tracker. Nh\u1eefng th\u00f4ng tin n\u00e0y g\u1ed3m l\u01b0u tr\u1eef page view cho c\u00e1c trang, hi\u1ec3n th\u1ecb theo th\u1eddi gian th\u1ef1c cho user, k\u00e8m theo l\u01b0u tr\u1eef 1 l\u01b0\u1ee3ng nh\u1ecf l\u1ecbch s\u1eed hi\u1ec3n th\u1ecb c\u1ee7a trang web.<br>Khi l\u01b0\u1ee3ng page view t\u0103ng v\u01b0\u1ee3t qu\u00e1 cao (h\u00e0ng ngh\u00ecn view trong 1 gi\u00e2y), Salvatore Sanfilippo th\u1ef1c s\u1ef1 b\u1ebf t\u1eafc v\u00ec kh\u00f4ng th\u1ec3 t\u00ecm ra c\u00e1ch ti\u1ebfp c\u1eadn n\u00e0o th\u1ef1c s\u1ef1 t\u1ed1i \u01b0u cho vi\u1ec7c thi\u1ebft k\u1ebf database c\u1ee7a m\u00ecnh.<br>\u00dd t\u01b0\u1edfng l\u01b0u tr\u1eef th\u00f4ng tin tr\u00ean RAM v\u00e0 qu\u1ea3n l\u00fd c\u00e1c page views d\u01b0\u1edbi d\u1ea1ng native data v\u1edbi th\u1eddi gian pop v\u00e0 push l\u00e0 h\u1eb1ng s\u1ed1 \u0111\u00e3 xu\u1ea5t hi\u1ec7n. T\u1eeb vi\u1ec7c x\u00e2y d\u1ef1ng prototype b\u1eb1ng C, b\u1ed5 sung t\u00ednh n\u0103ng l\u01b0u tr\u1eef th\u00f4ng tin tr\u00ean \u0111\u0129a c\u1ee9ng , &#8230; sau \u0111\u00f3, Redis ch\u00ednh th\u1ee9c &#8220;ra m\u1eaft&#8221; ng\u01b0\u1eddi d\u00f9ng.<br><\/p>\n\n\n\n<h4 id=\"Ng\u01b0\u1eddi_d\u00f9ng_s\u1eed_d\u1ee5ng_Redis_v\u00e0o_m\u1ee5c_\u0111\u00edch_g\u00ec?\"><strong>Ng\u01b0\u1eddi d\u00f9ng s\u1eed d\u1ee5ng Redis v\u00e0o m\u1ee5c \u0111\u00edch g\u00ec?<\/strong><\/h4>\n\n\n\n<h5 id=\"L\u00e0m_b\u1ed9_nh\u1edb_\u0111\u1ec7m_(cache)\"><strong>L\u00e0m b\u1ed9 nh\u1edb \u0111\u1ec7m (cache)<\/strong><\/h5>\n\n\n\n<p>L\u00e0 kho d\u1eef li\u1ec7u ch\u1ee9a c\u00e1c key-value m\u00e3 ngu\u1ed3n m\u1edf, Redis c\u00f3 th\u1ec3 ho\u1ea1t \u0111\u1ed9ng nh\u01b0 b\u1ed9 nh\u1edb trong ho\u1eb7c b\u1ed9 nh\u1edb cache.<br>Redis cached s\u1ebd h\u1ed7 tr\u1ee3 nhi\u1ec1u ki\u1ec3u c\u1ea5u tr\u00fac d\u1eef li\u1ec7u ph\u1ed5 bi\u1ebfn (hash, list, set, sorted set, string) c\u00f9ng v\u1edbi c\u00f4ng ngh\u1ec7 \u0111\u1ecdc ghi d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf v\u00e0 t\u1ed1i \u01b0u hi\u1ec7u su\u1ea5t t\u1ed1t h\u01a1n Memcached. \u0110\u1ed3ng th\u1eddi, Redis c\u00f2n c\u00f3 th\u1ec3 cho ph\u00e9p scripting b\u1eb1ng ng\u00f4n ng\u1eef Lua. Do \u0111\u00f3, Redis th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng l\u00e0m h\u1ec7 th\u1ed1ng l\u01b0u tr\u1eef cache-b\u1ed9 nh\u1edb \u0111\u1ec7m cho c\u00e1c \u1ee9ng d\u1ee5ng c\u1ea7n truy xu\u1ea5t d\u1eef li\u1ec7u v\u1edbi t\u1ed1c \u0111\u1ed9 ph\u1ea3n h\u1ed3i nhanh.<br>WordPress l\u00e0 m\u1ed9t v\u00ed d\u1ee5 \u0111i\u1ec3n h\u00ecnh. V\u1edbi Redis, ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 gi\u1ea3m b\u1edbt c\u00e1c truy v\u1ea5n database d\u1ef1 ph\u00f2ng v\u00e0 ti\u1ebft ki\u1ec7m th\u1eddi gian th\u1ef1c hi\u1ec7n m\u1ed9t trang WordPress. K\u1ebft qu\u1ea3 l\u00e0 WordPress s\u1ebd ch\u1ea1y nhanh h\u01a1n, s\u1eed d\u1ee5ng \u00edt t\u00e0i nguy\u00ean h\u01a1n, v\u00e0 cung c\u1ea5p m\u1ed9t b\u1ed9 nh\u1edb cache c\u00f3 th\u1ec3 \u0111i\u1ec1u ch\u1ec9nh li\u00ean t\u1ee5c.<br>\u0110\u1ed1i t\u01b0\u1ee3ng th\u01b0\u1eddng d\u00f9ng Redis cached l\u00e0 c\u00e1c website v\u1edbi h\u00e0ng tri\u1ec7u l\u01b0\u1ee3t truy c\u1eadp, c\u00e1c d\u1ecbch v\u1ee5 webserive, gi\u1ea3m t\u1ea3i h\u1ec7 th\u1ed1ng database cho c\u00e1c ki\u1ebfn tr\u00fac ph\u1ea7n m\u1ec1m l\u1edbn.<\/p>\n\n\n\n<h5 id=\"C\u01a1_s\u1edf_d\u1eef_li\u1ec7u_(database)\"><strong>C\u01a1 s\u1edf d\u1eef li\u1ec7u (database)<\/strong><\/h5>\n\n\n\n<p>B\u1ea3n ch\u1ea5t Redis l\u00e0 m\u1ed9t server c\u1ea5u tr\u00fac d\u1eef li\u1ec7u. Ng\u01b0\u1eddi d\u00f9ng c\u00f3 th\u1ec3 d\u00f9ng Redis \u0111\u01a1n l\u1ebb nh\u01b0 m\u1ed9t server ch\u1ee9a d\u1eef li\u1ec7u b\u00ecnh th\u01b0\u1eddng. Ho\u1eb7c k\u1ebft h\u1ee3p v\u1edbi m\u1ed9t database kh\u00e1c nh\u01b0 MySQL \u0111\u1ec3 t\u0103ng t\u1ed1c \u0111\u1ed9 x\u1eed l\u00ed c\u1ee7a n\u00f3.<br>B\u00ean c\u1ea1nh c\u01a1 ch\u1ebf l\u01b0u tr\u1eef backup tr\u00ean \u1ed5 \u0111\u0129a c\u1ee9ng nh\u01b0 c\u00e1c h\u1ec7 qu\u1ea3n tr\u1ecb d\u1eef li\u1ec7u kh\u00e1c, \u0111\u1ed9 b\u1ea3o m\u1eadt v\u00e0 s\u1eeda l\u1ed7i cao l\u00e0 \u0111i\u1ec3m \u0111\u1eb7c bi\u1ec7t c\u1ee7a c\u01a1 s\u1edf d\u1eef li\u1ec7u \u0111\u1eb7c bi\u1ec7t n\u00e0y.<\/p>\n\n\n\n<h5 id=\"Tr\u00ecnh_chuy\u1ec3n_ti\u1ebfp_tin_nh\u1eafn_v\u00e0_danh_s\u00e1ch_t\u00e1c_v\u1ee5_ch\u1edd_x\u1eed_l\u00fd_(message_broker)\"><strong>Tr\u00ecnh chuy\u1ec3n ti\u1ebfp tin nh\u1eafn v\u00e0 danh s\u00e1ch t\u00e1c v\u1ee5 ch\u1edd x\u1eed l\u00fd (message broker)<\/strong><\/h5>\n\n\n\n<p>Redis hi\u1ec7n cung c\u1ea5p th\u1eddi gian ph\u1ea3n h\u1ed3i \u1edf t\u1ed1c \u0111\u1ed9 ch\u01b0a \u0111\u1ebfn m\u1ed9t mili gi\u00e2y. Ch\u00ednh v\u00ec th\u1ebf, h\u00e0ng tri\u1ec7u y\u00eau c\u1ea7u m\u1ed7i gi\u00e2y cho c\u00e1c \u1ee9ng d\u1ee5ng th\u1eddi gian th\u1ef1c trong l\u0129nh v\u1ef1c Tr\u00f2 ch\u01a1i, C\u00f4ng ngh\u1ec7 qu\u1ea3ng c\u00e1o, D\u1ecbch v\u1ee5 t\u00e0i ch\u00ednh, Ch\u0103m s\u00f3c s\u1ee9c kh\u1ecfe v\u00e0 IoT \u0111\u01b0\u1ee3c \u0111\u00e1p \u1ee9ng r\u1ea5t nhanh g\u1ecdn.<br>Ngo\u00e0i ra, Redis th\u01b0\u1eddng c\u00f2n \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho ho\u1ea1t \u0111\u1ed9ng qu\u1ea3n l\u00fd phi\u00ean, tr\u00f2 ch\u01a1i, b\u1ea3ng x\u1ebfp h\u1ea1ng, ph\u00e2n t\u00edch theo th\u1eddi gian th\u1ef1c, d\u1eef li\u1ec7u kh\u00f4ng gian \u0111\u1ecba l\u00fd, \u1ee9ng d\u1ee5ng \u0111\u1eb7t xe, tr\u00f2 chuy\u1ec7n\/nh\u1eafn tin, ph\u00e1t tr\u1ef1c ti\u1ebfp n\u1ed9i dung ph\u01b0\u01a1ng ti\u1ec7n v\u00e0 pub\/sub.<\/p>\n\n\n\n<div class=\"wp-block-image wp-image-3050 size-full\"><figure class=\"aligncenter\"><img decoding=\"async\" src=\"https:\/\/tino.vn\/blog\/wp-content\/uploads\/2020\/01\/30-trie\u0323\u0302u-ba\u0309n-ghi-vo\u031b\u0301i-Redis.jpg\" alt=\"redis\" class=\"wp-image-3050\" title=\"\"><figcaption>30 tri\u1ec7u b\u1ea3n ghi v\u1edbi Redis<\/figcaption><\/figure><\/div>\n\n\n\n<h2 id=\"_So_s\u00e1nh_Redis_v\u1edbi_Memcached&nbsp;\"><strong> So s\u00e1nh Redis v\u1edbi Memcached&nbsp;<\/strong><\/h2>\n\n\n\n<h3 id=\"Gi\u1ed1ng_nhau\"><strong>Gi\u1ed1ng nhau<\/strong><\/h3>\n\n\n\n<p>Redis v\u00e0 Memcached \u0111\u1ec1u m\u1ea1nh v\u00e0 nhanh, l\u01b0u tr\u1eef d\u1eef li\u1ec7u trong b\u1ed9 nh\u1edb, h\u1eefu \u00edch nh\u01b0 b\u1ed9 nh\u1edb \u0111\u1ec7m. C\u1ea3 hai \u0111\u1ec1u c\u00f3 th\u1ec3 gi\u00fap t\u0103ng t\u1ed1c \u1ee9ng d\u1ee5ng c\u1ee7a ng\u01b0\u1eddi d\u00f9ng. Ph\u01b0\u01a1ng th\u1ee9c &#8220;t\u0103ng t\u1ed1c&#8221; c\u0169ng t\u01b0\u01a1ng t\u1ef1 nhau: l\u01b0u tr\u1eef k\u1ebft qu\u1ea3 c\u01a1 s\u1edf d\u1eef li\u1ec7u, c\u00e1c \u0111o\u1ea1n HTML ho\u1eb7c b\u1ea5t k\u1ef3 th\u1ee9 g\u00ec kh\u00e1c c\u00e1i m\u00e0 c\u00f3 th\u1ec3 t\u1ed1n nhi\u1ec1u chi ph\u00ed \u0111\u1ec3 ho\u1ea1t \u0111\u1ed9ng.<br>\u001dMemcached v\u00e0 Redis \u0111\u1ec1u l\u00e0 memory-mapped. \u0110\u1eb7c \u0111i\u1ec3m n\u00e0y nh\u1ea5n m\u1ea1nh cho ng\u01b0\u1eddi d\u00f9ng: t\u1ea5t c\u1ea3 d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c \u0111\u01b0a h\u1ebft v\u00e0o RAM (c\u00f3 c\u00e1ch \u0111\u1ec3 \u0111\u01b0a v\u00e0o swap) v\u00e0 cho ph\u00e9p theo m\u1ed9t kho\u1ea3ng th\u1eddi gian th\u00ec l\u01b0u m\u1ed9t b\u1ea3n dump c\u1ee7a t\u1ea5t c\u1ea3 d\u1eef li\u1ec7u v\u00e0o 1 file.<\/p>\n\n\n\n<h3 id=\"Kh\u00e1c_nhau\"><strong>Kh\u00e1c nhau<\/strong><\/h3>\n\n\n\n<p>C\u1ea3 Redis l\u1eabn Memcached \u0111\u1ec1u c\u00f3 nh\u1eefng \u01b0u, nh\u01b0\u1ee3c \u0111i\u1ec3m kh\u00e1c nhau. Nh\u1eefng th\u00f4ng s\u1ed1 k\u1ef9 thu\u1eadt kh\u00e1c nhau s\u1ebd ph\u00f9 h\u1ee3p v\u1edbi t\u1eebng \u0111\u1ed1i t\u01b0\u1ee3ng ng\u01b0\u1eddi d\u00f9ng kh\u00e1c nhau.<br>V\u00ec Memcached ra \u0111\u1eddi tr\u01b0\u1edbc n\u00ean ng\u01b0\u1eddi d\u00f9ng s\u1ebd \u0111\u01b0\u1ee3c nh\u1eadn nhi\u1ec1u h\u1ed7 tr\u1ee3 khi c\u00f3 v\u1ea5n \u0111\u1ec1 x\u1ea3y ra. Redis xu\u1ea5t hi\u1ec7n sau n\u00ean h\u1ed7 tr\u1ee3 ch\u01b0a \u0111\u01b0\u1ee3c t\u1ed1i \u01b0u. Tuy nhi\u00ean, Redis h\u1ed7 tr\u1ee3 r\u1ea5t nhi\u1ec1u ki\u1ec3u d\u1eef li\u1ec7u hi\u1ec7n \u0111\u1ea1i m\u00e0 Memcached ch\u01b0a \u0111\u00e1p \u1ee9ng \u0111\u01b0\u1ee3c.<br>M\u1ecdi th\u1eafc m\u1eafc v\u00e0 g\u00f3p \u00fd li\u00ean quan, xin vui l\u00f2ng <a href=\"https:\/\/tinohost.com\/lien-he?aff=447\" target=\"_blank\" rel=\"noopener noreferrer\">li\u00ean h\u1ec7 ngay Tinohost<\/a> \u0111\u1ec3 \u0111\u01b0\u1ee3c t\u01b0 v\u1ea5n chi ti\u1ebft nh\u00e9!<\/p>\n\n\n\n<h2 id=\"H\u1ed7_tr\u1ee3_24\/7\/365_&#8211;_&#8220;\u0111\u00fang_doanh_nghi\u1ec7p_&#8211;_\u0111\u00fang_d\u1ecbch_v\u1ee5_&#8211;_\u0111\u00fang_kh\u1ea3_n\u0103ng&#8221;\">H\u1ed7 tr\u1ee3 24\/7\/365 &#8211; &#8220;\u0111\u00fang doanh nghi\u1ec7p &#8211; \u0111\u00fang d\u1ecbch v\u1ee5 &#8211; \u0111\u00fang kh\u1ea3 n\u0103ng&#8221;<\/h2>\n\n\n\n<p>V\u1edbi \u0111\u1ed9i ng\u0169 nh\u00e2n vi\u00ean chuy\u00ean m\u00f4n cao, trang thi\u1ebft b\u1ecb t\u1ed1i t\u00e2n c\u00f9ng tinh th\u1ea7n t\u1eadn t\u00e2m <strong>h\u1ed7 tr\u1ee3 24\/7\/365<\/strong>,&nbsp; Tinohost t\u1ef1 tin cung c\u1ea5p <a href=\"https:\/\/tinohost.com\/ten-mien?aff=447\" target=\"_blank\" rel=\"noopener noreferrer\">d\u1ecbch v\u1ee5 t\u00ean mi\u1ec1n<\/a>&nbsp;, <a href=\"https:\/\/tinohost.com\/hosting?aff=447\" target=\"_blank\" rel=\"noopener noreferrer\">hosting<\/a> t\u1ed1i \u01b0u v\u00e0 h\u1ec7 th\u1ed1ng <a href=\"https:\/\/tinohost.com\/servers?aff=447\" target=\"_blank\" rel=\"noopener noreferrer\">m\u00e1y ch\u1ee7<\/a> m\u1ea1nh m\u1ebd v\u1edbi chi ph\u00ed t\u1ed1t nh\u1ea5t cho doanh nghi\u1ec7p c\u1ee7a b\u1ea1n.<br>Ch\u1ec9 c\u1ea7n \u0111\u1ec3 l\u1ea1i th\u00f4ng tin c\u00e1 nh\u00e2n c\u1ee7a b\u1ea1n, chuy\u00ean vi\u00ean t\u01b0 v\u1ea5n c\u1ee7a Tinohost s\u1ebd gi\u00fap b\u1ea1n ch\u1ecdn \u0111\u01b0\u1ee3c gi\u1ea3i ph\u00e1p t\u1ed1t nh\u1ea5t cho t\u00ean mi\u1ec1n v\u00e0 hosting. H\u00e3y \u0111\u1ec3 c\u00f4ng ngh\u1ec7 kh\u00f4ng ph\u1ea3i l\u00e0 r\u00e0o c\u1ea3n qu\u00e1 tr\u00ecnh ph\u00e1t tri\u1ec3n c\u00f4ng ty b\u1ea1n.<br>V\u1edbi b\u1ec1 d\u00e0y kinh nghi\u1ec7m h\u01a1n 5 n\u0103m cung c\u1ea5p hosting, d\u1ecbch v\u1ee5 cho thu\u00ea m\u00e1y ch\u1ee7, c\u00e1c d\u1ecbch v\u1ee5 li\u00ean quan \u0111\u1ebfn t\u00ean mi\u1ec1n v\u00e0 b\u1ea3o m\u1eadt website, h\u00e3y \u0111\u1ec3 <a href=\"https:\/\/tinohost.com\/?aff=447\" target=\"_blank\" rel=\"noopener\">Tinohost<\/a> \u0111\u1ed3ng h\u00e0nh c\u00f9ng b\u1ea1n tr\u00ean con \u0111\u01b0\u1eddng kh\u1eb3ng \u0111\u1ecbnh th\u01b0\u01a1ng hi\u1ec7u tr\u00ean b\u1ea3n \u0111\u1ed3 c\u00f4ng ngh\u1ec7 to\u00e0n c\u1ea7u!<\/p>\n\n\n\n\n<ul>\n<li><i class=\"fa fa-map-marker\"><\/i><br>\nV\u0103n ph\u00f2ng \u0111\u1ea1i di\u1ec7n: T\u1ea7ng 31, T\u00f2a L2, Vinhomes Central Park, 720A \u0110i\u1ec7n Bi\u00ean Ph\u1ee7, P.22, Q.B\u00ecnh Th\u1ea1nh, Th\u00e0nh ph\u1ed1 H\u1ed3 Ch\u00ed Minh<\/li>\n<li>\n<\/li>\n<li><\/li>\n<li>Website:&nbsp;<a href=\"https:\/\/tinohost.com\/?aff=447\" target=\"_blank\" rel=\"noopener\"><\/a><\/li>\n<\/ul>","protected":false},"excerpt":{"rendered":"<p>Memcached v\u00e0 Redis l\u00e0 g\u00ec? &nbsp;B\u1ed9 nh\u1edb ng\u1eafn h\u1ea1n cho c\u00e1c \u1ee9ng d\u1ee5ng: Memcached Trong c\u00f4ng ngh\u1ec7 th\u00f4ng tin, \u0111\u00e2y l\u00e0 m\u1ed9t l\u00e0 in-memory cache, l\u01b0u tr\u1eef d\u1eef li\u1ec7u d\u01b0\u1edbi d\u1ea1ng key-value.Memcached l\u00e0 m\u1ed9t h\u1ec7 th\u1ed1ng l\u01b0u tr\u1eef b\u1ed9 nh\u1edb ph\u00e2n t\u00e1n m\u00e3 ngu\u1ed3n m\u1edf \u0111\u1eb7c bi\u1ec7t. Nh\u1eefng th\u00f4ng tin \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef trong Memcached [&hellip;]<\/p>\n","protected":false},"author":19,"featured_media":15909,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[5553,5554],"class_list":["post-15908","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","tag-memcached","tag-redis"],"_links":{"self":[{"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/posts\/15908","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/users\/19"}],"replies":[{"embeddable":true,"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/comments?post=15908"}],"version-history":[{"count":1,"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/posts\/15908\/revisions"}],"predecessor-version":[{"id":114707,"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/posts\/15908\/revisions\/114707"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/media\/15909"}],"wp:attachment":[{"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/media?parent=15908"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/categories?post=15908"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tino.vn\/blog\/wp-json\/wp\/v2\/tags?post=15908"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}