{"id":21541,"date":"2024-01-02T11:10:27","date_gmt":"2024-01-02T11:10:27","guid":{"rendered":"https:\/\/server.hk\/blog\/21541\/"},"modified":"2024-11-14T10:31:02","modified_gmt":"2024-11-14T02:31:02","slug":"mongodb-glossary-ttl-index","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/21541\/","title":{"rendered":"MongoDB \u8a5e\u5f59\u8868 &#8211; TTL \u7d22\u5f15"},"content":{"rendered":"<h1 id=\"mongodb-glossary-ttl-index-kzcIcnMawx\">MongoDB \u8a5e\u5f59\u8868 &#8211; TTL \u7d22\u5f15<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7684\u4e16\u754c\u4e2d\uff0cMongoDB \u56e0\u5176\u9748\u6d3b\u6027\u3001\u53ef\u64f4\u5c55\u6027\u53ca\u6613\u7528\u6027\u800c\u5ee3\u53d7\u6b61\u8fce\u3002MongoDB \u63d0\u4f9b\u7684\u5176\u4e2d\u4e00\u500b\u95dc\u9375\u529f\u80fd\u662f\u5b58\u6d3b\u6642\u9593\uff08TTL\uff09\u7d22\u5f15\u3002\u5728\u672c\u6587\u4e2d\uff0c\u6211\u5011\u5c07\u63a2\u8a0e\u4ec0\u9ebc\u662f TTL \u7d22\u5f15\u3001\u5176\u904b\u4f5c\u65b9\u5f0f\u53ca\u5176\u5728 MongoDB \u4e2d\u7684\u512a\u52e2\u3002<\/p>\n<h2 id=\"what-is-a-ttl-index-kzcIcnMawx\">\u4ec0\u9ebc\u662f TTL \u7d22\u5f15\uff1f<\/h2>\n<p>TTL \u7d22\u5f15\uff0c\u5373\u5b58\u6d3b\u6642\u9593\uff08Time-To-Live\uff09\u7d22\u5f15\uff0c\u662f MongoDB \u4e2d\u4e00\u7a2e\u7279\u6b8a\u7684\u7d22\u5f15\u985e\u578b\uff0c\u53ef\u5728\u6587\u4ef6\u5230\u9054\u4e00\u5b9a\u6642\u9593\u5f8c\u81ea\u52d5\u5f9e\u96c6\u5408\u4e2d\u522a\u9664\u3002\u5b83\u5141\u8a31\u4f60\u6839\u64da\u6587\u4ef6\u4e2d\u7684\u7279\u5b9a\u6b04\u4f4d\u4f86\u5b9a\u7fa9\u6587\u4ef6\u7684\u904e\u671f\u6642\u9593\u3002<\/p>\n<p>\u7576\u6587\u4ef6\u5230\u9054\u904e\u671f\u6642\u9593\u5f8c\uff0cMongoDB \u6703\u81ea\u52d5\u5c07\u5176\u5f9e\u96c6\u5408\u4e2d\u522a\u9664\uff0c\u91cb\u653e\u5b58\u5132\u7a7a\u9593\u53ca\u8cc7\u6e90\u3002\u9019\u9805\u529f\u80fd\u5c0d\u65bc\u7ba1\u7406\u6709\u9650\u751f\u547d\u9031\u671f\u7684\u8cc7\u6599\uff08\u5982\u6703\u8a71\u8cc7\u6599\u3001\u65e5\u8a8c\u6216\u81e8\u6642\u8cc7\u6599\uff09\u5c24\u5176\u6709\u7528\u3002<\/p>\n<h2 id=\"how-does-a-ttl-index-work-kzcIcnMawx\">TTL \u7d22\u5f15\u5982\u4f55\u904b\u4f5c\uff1f<\/h2>\n<p>\u8981\u5728 MongoDB \u4e2d\u5275\u5efa TTL \u7d22\u5f15\uff0c\u9700\u6307\u5b9a\u5305\u542b\u6bcf\u500b\u6587\u4ef6\u904e\u671f\u6642\u9593\u7684\u6b04\u4f4d\u3002\u8a72\u6b04\u4f4d\u5fc5\u9808\u662f Date \u6216 BSON timestamp \u985e\u578b\u3002MongoDB \u6703\u5b9a\u671f\u6383\u63cf\u96c6\u5408\uff0c\u6839\u64da TTL \u6b04\u4f4d\u7684\u503c\u522a\u9664\u5df2\u904e\u671f\u7684\u6587\u4ef6\u3002<\/p>\n<p>\u5275\u5efa TTL \u7d22\u5f15\u6642\uff0c\u9084\u53ef\u4ee5\u6307\u5b9a\u6587\u4ef6\u61c9\u8a72\u5728\u591a\u5c11\u79d2\u5f8c\u904e\u671f\u3002MongoDB \u4f7f\u7528\u4e00\u500b\u80cc\u666f\u57f7\u884c\u7dd2\u4f86\u9032\u884c\u904e\u671f\u6aa2\u67e5\uff0c\u78ba\u4fdd\u4e0d\u6703\u5f71\u97ff\u5176\u4ed6\u8cc7\u6599\u5eab\u64cd\u4f5c\u7684\u6548\u80fd\u3002<\/p>\n<h2 id=\"benefits-of-using-a-ttl-index-kzcIcnMawx\">\u4f7f\u7528 TTL \u7d22\u5f15\u7684\u597d\u8655<\/h2>\n<p>\u5728 MongoDB \u4e2d\u4f7f\u7528 TTL \u7d22\u5f15\u6709\u591a\u500b\u597d\u8655\uff1a<\/p>\n<ul>\n<li><strong>\u81ea\u52d5\u6e05\u7406\u8cc7\u6599\uff1a<\/strong>\u4f7f\u7528 TTL \u7d22\u5f15\uff0c\u7121\u9700\u624b\u52d5\u522a\u9664\u904e\u671f\u6587\u4ef6\u3002MongoDB \u6703\u81ea\u52d5\u8655\u7406\u6e05\u7406\u904e\u7a0b\uff0c\u7bc0\u7701\u6642\u9593\u548c\u7cbe\u529b\u3002<\/li>\n<li><strong>\u512a\u5316\u5b58\u5132\u7a7a\u9593\uff1a<\/strong>\u901a\u904e\u81ea\u52d5\u522a\u9664\u904e\u671f\u6587\u4ef6\uff0cTTL \u7d22\u5f15\u6709\u52a9\u65bc\u512a\u5316\u5b58\u5132\u7a7a\u9593\uff0c\u78ba\u4fdd\u8cc7\u6599\u5eab\u53ea\u5305\u542b\u76f8\u95dc\u7684\u3001\u6700\u65b0\u7684\u8cc7\u6599\u3002<\/li>\n<li><strong>\u63d0\u5347\u6548\u80fd\uff1a<\/strong>MongoDB \u4f7f\u7528\u7684\u80cc\u666f\u57f7\u884c\u7dd2\u9032\u884c\u904e\u671f\u6aa2\u67e5\uff0c\u78ba\u4fdd TTL \u7d22\u5f15\u4e0d\u6703\u5f71\u97ff\u5176\u4ed6\u8cc7\u6599\u5eab\u64cd\u4f5c\u7684\u6548\u80fd\u3002<\/li>\n<\/ul>\n<h2 id=\"example-usage-kzcIcnMawx\">\u7bc4\u4f8b\u7528\u6cd5<\/h2>\n<p>\u8b93\u6211\u5011\u8003\u616e\u4e00\u500b\u7bc4\u4f8b\uff1a\u4f60\u6709\u4e00\u500b\u540d\u70ba &#8220;sessions&#8221; \u7684\u96c6\u5408\uff0c\u7528\u4f86\u5b58\u5132\u7528\u6236\u7684\u6703\u8a71\u8cc7\u6599\u3002\u96c6\u5408\u4e2d\u7684\u6bcf\u500b\u6587\u4ef6\u90fd\u6709\u4e00\u500b &#8220;createdAt&#8221; \u6b04\u4f4d\uff0c\u8868\u793a\u6703\u8a71\u7684\u5275\u5efa\u6642\u9593\u3002\u8981\u70ba\u6b64\u96c6\u5408\u5275\u5efa TTL \u7d22\u5f15\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\uff1a<\/p>\n<pre><code>db.sessions.createIndex({ \"createdAt\": 1 }, { expireAfterSeconds: 3600 })\r\n<\/code><\/pre>\n<p>\u5728\u6b64\u7bc4\u4f8b\u4e2d\uff0cTTL \u7d22\u5f15\u662f\u5728 &#8220;createdAt&#8221; \u6b04\u4f4d\u4e0a\u5efa\u7acb\u7684\uff0c\u4efb\u4f55\u8d85\u904e 3600 \u79d2\uff081 \u5c0f\u6642\uff09\u7684\u6587\u4ef6\u5c07\u81ea\u52d5\u5f9e\u96c6\u5408\u4e2d\u522a\u9664\u3002<\/p>\n<h2 id=\"summary-kzcIcnMawx\">\u7e3d\u7d50<\/h2>\n<p>\u7e3d\u7684\u4f86\u8aaa\uff0cMongoDB \u4e2d\u7684 TTL \u7d22\u5f15\u662f\u4e00\u500b\u5f37\u5927\u7684\u529f\u80fd\uff0c\u5141\u8a31\u4f60\u5728\u6587\u4ef6\u9054\u5230\u7279\u5b9a\u6642\u9593\u5f8c\u81ea\u52d5\u5c07\u5176\u5f9e\u96c6\u5408\u4e2d\u522a\u9664\u3002\u5b83\u5177\u6709\u81ea\u52d5\u8cc7\u6599\u6e05\u7406\u3001\u512a\u5316\u5b58\u5132\u7a7a\u9593\u53ca\u63d0\u5347\u6548\u80fd\u7b49\u512a\u52e2\u3002\u82e5\u4f60\u6b63\u5728\u5c0b\u627e\u53ef\u9760\u7684 VPS \u8a17\u7ba1\u89e3\u6c7a\u65b9\u6848\u4f86\u904b\u884c MongoDB \u8cc7\u6599\u5eab\uff0c\u8003\u616e\u9078\u64c7 <a href=\"https:\/\/server.hk\">Server.HK<\/a>\u3002\u4ed6\u5011\u63d0\u4f9b\u7684\u9802\u7d1a VPS \u89e3\u6c7a\u65b9\u6848\uff0c\u80fd\u78ba\u4fdd\u4f60\u7684 MongoDB \u90e8\u7f72\u5e73\u7a69\u904b\u884c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>MongoDB \u8a5e\u5f59\u8868 &#038;#82&#46;&#46;&#46;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-21541","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/21541","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"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=21541"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/21541\/revisions"}],"predecessor-version":[{"id":23917,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/21541\/revisions\/23917"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=21541"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=21541"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=21541"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}