{"id":183032,"date":"2024-11-10T01:22:19","date_gmt":"2024-11-09T17:22:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/183032\/"},"modified":"2024-11-10T01:22:20","modified_gmt":"2024-11-09T17:22:20","slug":"%e5%af%a6%e7%8f%beredis%e7%9a%84ttl%e5%ba%95%e5%b1%a4%e5%af%a6%e7%8f%be%e6%8e%a2%e7%a9%b6%ef%bc%88redis%e7%9a%84ttl%e5%ba%95%e5%b1%a4%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/183032\/","title":{"rendered":"\u5be6\u73feRedis\u7684TTL\u5e95\u5c64\u5be6\u73fe\u63a2\u7a76\uff08redis\u7684ttl\u5e95\u5c64\uff09"},"content":{"rendered":"<h1 id=\"%e5%af%a6%e7%8f%beredis%e7%9a%84ttl%e5%ba%95%e5%b1%a4%e5%af%a6%e7%8f%be%e6%8e%a2%e7%a9%b6%ef%bc%88redis%e7%9a%84ttl%e5%ba%95%e5%b1%a4%ef%bc%89-bJBiaondxS\">\u5be6\u73feRedis\u7684TTL\u5e95\u5c64\u5be6\u73fe\u63a2\u7a76\uff08redis\u7684ttl\u5e95\u5c64\uff09<\/h1>\n<p>Redis\u662f\u4e00\u500b\u9ad8\u6548\u7684\u9375\u503c\u6578\u64da\u5eab\uff0c\u5ee3\u6cdb\u61c9\u7528\u65bc\u5404\u7a2e\u5834\u666f\u4e2d\uff0c\u7279\u5225\u662f\u5728\u9700\u8981\u5feb\u901f\u8b80\u53d6\u548c\u5beb\u5165\u7684\u61c9\u7528\u4e2d\u3002TTL\uff08Time To Live\uff09\u662fRedis\u7684\u4e00\u500b\u91cd\u8981\u7279\u6027\uff0c\u5141\u8a31\u7528\u6236\u70ba\u9375\u8a2d\u7f6e\u904e\u671f\u6642\u9593\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eRedis\u4e2dTTL\u7684\u5e95\u5c64\u5be6\u73fe\uff0c\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u7406\u89e3\u5176\u5de5\u4f5c\u539f\u7406\u3002<\/p>\n<h2 id=\"ttl%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-bJBiaondxS\">TTL\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>TTL\u662f\u6307\u9375\u5728Redis\u4e2d\u5b58\u6d3b\u7684\u6642\u9593\uff0c\u7576\u6642\u9593\u5230\u9054\u5f8c\uff0c\u8a72\u9375\u5c07\u81ea\u52d5\u88ab\u522a\u9664\u3002\u9019\u4e00\u7279\u6027\u5c0d\u65bc\u7de9\u5b58\u6578\u64da\u3001\u6703\u8a71\u7ba1\u7406\u7b49\u5834\u666f\u975e\u5e38\u6709\u7528\u3002\u7528\u6236\u53ef\u4ee5\u901a\u904e\u547d\u4ee4\u8a2d\u7f6eTTL\uff0c\u4f8b\u5982\uff1a<\/p>\n<pre><code>SET mykey \"Hello\"\nEXPIRE mykey 10<\/code><\/pre>\n<p>\u4e0a\u8ff0\u547d\u4ee4\u5c07\u572810\u79d2\u5f8c\u81ea\u52d5\u522a\u9664\u9375\u201cmykey\u201d\u3002<\/p>\n<h2 id=\"ttl%e7%9a%84%e5%ba%95%e5%b1%a4%e5%af%a6%e7%8f%be-bJBiaondxS\">TTL\u7684\u5e95\u5c64\u5be6\u73fe<\/h2>\n<p>Redis\u7684TTL\u5be6\u73fe\u4e3b\u8981\u4f9d\u8cf4\u65bc\u5169\u500b\u6578\u64da\u7d50\u69cb\uff1a\u5b57\u5178\uff08dict\uff09\u548c\u904e\u671f\u6642\u9593\u7684\u93c8\u8868\u3002\u7576\u7528\u6236\u8a2d\u7f6eTTL\u6642\uff0cRedis\u6703\u5c07\u904e\u671f\u6642\u9593\u5b58\u5132\u5728\u4e00\u500b\u984d\u5916\u7684\u6578\u64da\u7d50\u69cb\u4e2d\uff0c\u9019\u6a23\u53ef\u4ee5\u5728\u67e5\u8a62\u6642\u5feb\u901f\u6aa2\u67e5\u9375\u662f\u5426\u904e\u671f\u3002<\/p>\n<h3 id=\"%e9%81%8e%e6%9c%9f%e6%99%82%e9%96%93%e7%9a%84%e5%ad%98%e5%84%b2-bJBiaondxS\">\u904e\u671f\u6642\u9593\u7684\u5b58\u5132<\/h3>\n<p>\u5728Redis\u4e2d\uff0c\u6bcf\u500b\u9375\u90fd\u53ef\u4ee5\u6709\u4e00\u500b\u95dc\u806f\u7684\u904e\u671f\u6642\u9593\u3002\u9019\u500b\u904e\u671f\u6642\u9593\u662f\u4ee5\u6beb\u79d2\u70ba\u55ae\u4f4d\u7684\u6642\u9593\u6233\uff0c\u7576\u9375\u88ab\u8a2d\u7f6e\u6642\uff0cRedis\u6703\u8a08\u7b97\u51fa\u904e\u671f\u7684\u5177\u9ad4\u6642\u9593\u4e26\u5c07\u5176\u5b58\u5132\u5728\u4e00\u500b\u540d\u70ba\u201cexpires\u201d\u7684\u5b57\u5178\u4e2d\u3002\u9019\u500b\u5b57\u5178\u7684\u7d50\u69cb\u5982\u4e0b\uff1a<\/p>\n<pre><code>typedef struct redisObject {\n    \/\/ \u5176\u4ed6\u5c6c\u6027\n    long long ttl; \/\/ \u9375\u7684\u904e\u671f\u6642\u9593\n} robj;<\/code><\/pre>\n<p>\u7576\u7528\u6236\u67e5\u8a62\u9375\u6642\uff0cRedis\u6703\u6aa2\u67e5\u8a72\u9375\u7684\u904e\u671f\u6642\u9593\uff0c\u5982\u679c\u7576\u524d\u6642\u9593\u8d85\u904e\u4e86\u904e\u671f\u6642\u9593\uff0c\u5247\u8a72\u9375\u6703\u88ab\u8996\u70ba\u904e\u671f\u4e26\u88ab\u522a\u9664\u3002<\/p>\n<h3 id=\"%e9%81%8e%e6%9c%9f%e9%8d%b5%e7%9a%84%e5%88%aa%e9%99%a4%e7%ad%96%e7%95%a5-bJBiaondxS\">\u904e\u671f\u9375\u7684\u522a\u9664\u7b56\u7565<\/h3>\n<p>Redis\u4f7f\u7528\u5169\u7a2e\u7b56\u7565\u4f86\u8655\u7406\u904e\u671f\u9375\uff1a<\/p>\n<ul>\n<li><strong>\u60f0\u6027\u522a\u9664\uff08Lazy Deletion\uff09<\/strong>\uff1a\u7576\u7528\u6236\u8acb\u6c42\u4e00\u500b\u9375\u6642\uff0cRedis\u6703\u6aa2\u67e5\u8a72\u9375\u662f\u5426\u904e\u671f\u3002\u5982\u679c\u904e\u671f\uff0c\u5247\u522a\u9664\u8a72\u9375\u4e26\u8fd4\u56de\u7a7a\u503c\u3002\u9019\u7a2e\u65b9\u6cd5\u7684\u512a\u9ede\u662f\u6e1b\u5c11\u4e86\u7cfb\u7d71\u7684\u958b\u92b7\uff0c\u4f46\u53ef\u80fd\u6703\u5c0e\u81f4\u904e\u671f\u9375\u5728\u5167\u5b58\u4e2d\u5b58\u5728\u4e00\u6bb5\u6642\u9593\u3002<\/li>\n<li><strong>\u4e3b\u52d5\u522a\u9664\uff08Active Expiration\uff09<\/strong>\uff1aRedis\u6703\u5b9a\u671f\u96a8\u6a5f\u6aa2\u67e5\u4e00\u90e8\u5206\u9375\uff0c\u522a\u9664\u904e\u671f\u7684\u9375\u3002\u9019\u6a23\u53ef\u4ee5\u6709\u6548\u5730\u91cb\u653e\u5167\u5b58\uff0c\u907f\u514d\u904e\u671f\u9375\u4f54\u7528\u8cc7\u6e90\u3002<\/li>\n<\/ul>\n<h2 id=\"ttl%e7%9a%84%e6%80%a7%e8%83%bd%e8%80%83%e9%87%8f-bJBiaondxS\">TTL\u7684\u6027\u80fd\u8003\u91cf<\/h2>\n<p>TTL\u7684\u5be6\u73fe\u96d6\u7136\u9ad8\u6548\uff0c\u4f46\u5728\u9ad8\u4e26\u767c\u7684\u5834\u666f\u4e0b\uff0c\u904e\u671f\u9375\u7684\u6aa2\u67e5\u548c\u522a\u9664\u53ef\u80fd\u6703\u6210\u70ba\u6027\u80fd\u74f6\u9838\u3002\u56e0\u6b64\uff0cRedis\u5728\u8a2d\u8a08\u6642\u8003\u616e\u4e86\u9019\u4e9b\u56e0\u7d20\uff0c\u901a\u904e\u4f7f\u7528\u9ad8\u6548\u7684\u6578\u64da\u7d50\u69cb\u548c\u7b97\u6cd5\u4f86\u512a\u5316\u6027\u80fd\u3002\u4f8b\u5982\uff0cRedis\u4f7f\u7528\u4e86\u54c8\u5e0c\u8868\u4f86\u5b58\u5132\u9375\u503c\u5c0d\uff0c\u9019\u6a23\u53ef\u4ee5\u5728O(1)\u7684\u6642\u9593\u5167\u67e5\u627e\u9375\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-bJBiaondxS\">\u7d50\u8ad6<\/h2>\n<p>Redis\u7684TTL\u7279\u6027\u70ba\u958b\u767c\u8005\u63d0\u4f9b\u4e86\u9748\u6d3b\u7684\u6578\u64da\u7ba1\u7406\u65b9\u5f0f\uff0c\u901a\u904e\u5408\u7406\u7684\u5e95\u5c64\u5be6\u73fe\uff0c\u80fd\u5920\u9ad8\u6548\u5730\u8655\u7406\u904e\u671f\u9375\u7684\u6aa2\u67e5\u548c\u522a\u9664\u3002\u4e86\u89e3\u9019\u4e9b\u5e95\u5c64\u5be6\u73fe\u4e0d\u50c5\u6709\u52a9\u65bc\u958b\u767c\u8005\u66f4\u597d\u5730\u4f7f\u7528Redis\uff0c\u4e5f\u80fd\u5728\u8a2d\u8a08\u7cfb\u7d71\u6642\u505a\u51fa\u66f4\u660e\u667a\u7684\u9078\u64c7\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u5982\u4f55\u5728\u60a8\u7684\u61c9\u7528\u4e2d\u4f7f\u7528Redis\u7684TTL\u7279\u6027\u6709\u9032\u4e00\u6b65\u7684\u8208\u8da3\uff0c\u6216\u8005\u60f3\u8981\u4e86\u89e3\u66f4\u591a\u95dc\u65bc<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u548c<a href=\"https:\/\/server.hk\">\u4e91\u670d\u52a1\u5668<\/a>\u7684\u8cc7\u8a0a\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6df1\u5165\u63a2\u8a0eRedis\u7684TTL\u5e95\u5c64\u5be6\u73fe\uff0c\u63ed\u793a\u5176\u904e\u671f\u9375\u7684\u7ba1\u7406\u6a5f\u5236\u53ca\u6027\u80fd\u512a\u5316\u7b56\u7565\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-183032","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/183032","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=183032"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/183032\/revisions"}],"predecessor-version":[{"id":183033,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/183032\/revisions\/183033"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=183032"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=183032"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=183032"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}