{"id":21545,"date":"2024-01-02T11:15:30","date_gmt":"2024-01-02T11:15:30","guid":{"rendered":"https:\/\/server.hk\/blog\/21545\/"},"modified":"2024-11-14T10:30:58","modified_gmt":"2024-11-14T02:30:58","slug":"mongodb-glossary-multikey-index","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/21545\/","title":{"rendered":"MongoDB \u8a5e\u5f59\u8868 &#8211; \u591a\u9375\u7d22\u5f15"},"content":{"rendered":"<h1 id=\"mongodb-glossary-multikey-index-UDUgPtYhiA\">MongoDB \u8a5e\u5f59\u8868 &#8211; \u591a\u9375\u7d22\u5f15<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7684\u4e16\u754c\u4e2d\uff0c\u7d22\u5f15\u5728\u63d0\u5347\u67e5\u8a62\u6548\u80fd\u548c\u52a0\u5feb\u8cc7\u6599\u6aa2\u7d22\u65b9\u9762\u767c\u63ee\u4e86\u81f3\u95dc\u91cd\u8981\u7684\u4f5c\u7528\u3002MongoDB \u4f5c\u70ba\u4e00\u500b\u53d7\u6b61\u8fce\u7684 NoSQL \u8cc7\u6599\u5eab\uff0c\u63d0\u4f9b\u4e86\u5404\u7a2e\u7d22\u5f15\u9078\u9805\u4f86\u512a\u5316\u8cc7\u6599\u5b58\u53d6\u3002\u591a\u9375\u7d22\u5f15\u5c31\u662f\u5176\u4e2d\u4e00\u500b\u5f37\u5927\u7684\u7d22\u5f15\u529f\u80fd\u3002<\/p>\n<h2 id=\"understanding-indexing-in-mongodb-UDUgPtYhiA\">\u7406\u89e3 MongoDB \u4e2d\u7684\u7d22\u5f15<\/h2>\n<p>\u5728\u6df1\u5165\u4e86\u89e3\u591a\u9375\u7d22\u5f15\u4e4b\u524d\uff0c\u8b93\u6211\u5011\u7c21\u55ae\u7406\u89e3\u4e00\u4e0b MongoDB \u4e2d\u7684\u7d22\u5f15\u3002\u7d22\u5f15\u662f\u4e00\u7a2e\u8cc7\u6599\u7d50\u69cb\uff0c\u80fd\u63d0\u9ad8\u8cc7\u6599\u5eab\u96c6\u5408\u4e2d\u7684\u8cc7\u6599\u6aa2\u7d22\u901f\u5ea6\u3002\u5b83\u8b93 MongoDB \u80fd\u5920\u9ad8\u6548\u5730\u5b9a\u4f4d\u8cc7\u6599\uff0c\u7121\u9700\u6383\u63cf\u96c6\u5408\u4e2d\u7684\u6bcf\u500b\u6587\u4ef6\u3002<\/p>\n<p>\u900f\u904e\u5728\u7279\u5b9a\u6b04\u4f4d\u4e0a\u5efa\u7acb\u7d22\u5f15\uff0cMongoDB \u53ef\u4ee5\u5feb\u901f\u8b58\u5225\u7b26\u5408\u67e5\u8a62\u689d\u4ef6\u7684\u6587\u4ef6\u3002\u9019\u6709\u52a9\u65bc\u6e1b\u5c11\u9700\u8981\u6aa2\u67e5\u7684\u6587\u4ef6\u6578\u91cf\uff0c\u5f9e\u800c\u52a0\u5feb\u67e5\u8a62\u57f7\u884c\u901f\u5ea6\u3002<\/p>\n<h2 id=\"what-is-a-multikey-index-UDUgPtYhiA\">\u4ec0\u9ebc\u662f\u591a\u9375\u7d22\u5f15\uff1f<\/h2>\n<p>\u591a\u9375\u7d22\u5f15\uff08MultiKey Index\uff09\uff0c\u4ea6\u7a31\u70ba\u591a\u503c\u7d22\u5f15\uff0c\u662f\u80fd\u5920\u8655\u7406\u7279\u5b9a\u6b04\u4f4d\u7684\u9663\u5217\u503c\u7684\u7d22\u5f15\u3002\u5728 MongoDB \u4e2d\uff0c\u6587\u4ef6\u4e2d\u7684\u6b04\u4f4d\u53ef\u4ee5\u5305\u542b\u9663\u5217\u4f5c\u70ba\u5176\u503c\u3002\u7576\u4f60\u5728\u9019\u985e\u6b04\u4f4d\u4e0a\u5efa\u7acb\u591a\u9375\u7d22\u5f15\u6642\uff0cMongoDB \u6703\u5206\u5225\u70ba\u9663\u5217\u4e2d\u7684\u6bcf\u500b\u5143\u7d20\u5efa\u7acb\u7d22\u5f15\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u8003\u616e\u4e00\u500b\u5716\u66f8\u96c6\u5408\uff0c\u6bcf\u500b\u6587\u4ef6\u90fd\u6709\u4e00\u500b\u540d\u70ba &#8220;authors&#8221; \u7684\u6b04\u4f4d\uff0c\u8a72\u6b04\u4f4d\u5305\u542b\u4f5c\u8005\u540d\u5b57\u7684\u9663\u5217\u3002\u901a\u904e\u5728 &#8220;authors&#8221; \u6b04\u4f4d\u4e0a\u5efa\u7acb\u591a\u9375\u7d22\u5f15\uff0cMongoDB \u6703\u70ba\u6bcf\u500b\u4f5c\u8005\u540d\u5b57\u5206\u5225\u5efa\u7acb\u7d22\u5f15\uff0c\u5f9e\u800c\u5141\u8a31\u57fa\u65bc\u4f5c\u8005\u540d\u5b57\u9032\u884c\u9ad8\u6548\u67e5\u8a62\u3002<\/p>\n<h2 id=\"benefits-of-multikey-index-UDUgPtYhiA\">\u591a\u9375\u7d22\u5f15\u7684\u597d\u8655<\/h2>\n<p>MongoDB \u7684\u591a\u9375\u7d22\u5f15\u529f\u80fd\u5e36\u4f86\u4e86\u591a\u500b\u597d\u8655\uff1a<\/p>\n<ul>\n<li><strong>\u9ad8\u6548\u7684\u9663\u5217\u67e5\u8a62\uff1a<\/strong>\u6709\u4e86\u591a\u9375\u7d22\u5f15\uff0cMongoDB \u80fd\u5920\u57fa\u65bc\u9663\u5217\u4e2d\u7684\u503c\u5feb\u901f\u5339\u914d\u6587\u4ef6\u3002\u9019\u5c0d\u65bc\u67e5\u8a62\u5305\u542b\u9663\u5217\u6b04\u4f4d\u4e2d\u7279\u5b9a\u5143\u7d20\u7684\u64cd\u4f5c\u5c24\u5176\u6709\u7528\u3002<\/li>\n<li><strong>\u9748\u6d3b\u7684\u8cc7\u6599\u5efa\u6a21\uff1a<\/strong>\u591a\u9375\u7d22\u5f15\u5141\u8a31\u4f60\u4f7f\u7528\u9663\u5217\u4f86\u5efa\u6a21\u8cc7\u6599\uff0c\u63d0\u4f9b\u4e86\u8868\u793a\u5be6\u9ad4\u9593\u8907\u96dc\u95dc\u4fc2\u7684\u9748\u6d3b\u6027\u3002<\/li>\n<li><strong>\u6539\u9032\u67e5\u8a62\u6548\u80fd\uff1a<\/strong>\u901a\u904e\u5c0d\u9663\u5217\u4e2d\u7684\u500b\u5225\u5143\u7d20\u5efa\u7acb\u7d22\u5f15\uff0c\u591a\u9375\u7d22\u5f15\u80fd\u63d0\u5347\u67e5\u8a62\u6548\u80fd\uff0c\u6e1b\u5c11\u9700\u8981\u6383\u63cf\u7684\u6587\u4ef6\u6578\u91cf\u3002<\/li>\n<\/ul>\n<h2 id=\"creating-a-multikey-index-UDUgPtYhiA\">\u5efa\u7acb\u591a\u9375\u7d22\u5f15<\/h2>\n<p>\u8981\u5728 MongoDB \u4e2d\u5efa\u7acb\u591a\u9375\u7d22\u5f15\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>createIndex()<\/code> \u65b9\u6cd5\uff0c\u4e26\u5c07 <code>\"multikey\"<\/code> \u9078\u9805\u8a2d\u7f6e\u70ba <code>true<\/code>\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>db.books.createIndex({ authors: 1 }, { multikey: true })\r\n<\/code><\/pre>\n<p>\u5728\u4e0a\u8ff0\u7bc4\u4f8b\u4e2d\uff0c\u6211\u5011\u5728 &#8220;books&#8221; \u96c6\u5408\u7684 &#8220;authors&#8221; \u6b04\u4f4d\u4e0a\u5efa\u7acb\u4e86\u591a\u9375\u7d22\u5f15\u3002<\/p>\n<h2 id=\"limitations-of-multikey-index-UDUgPtYhiA\">\u591a\u9375\u7d22\u5f15\u7684\u9650\u5236<\/h2>\n<p>\u5118\u7ba1\u591a\u9375\u7d22\u5f15\u6709\u986f\u8457\u7684\u512a\u9ede\uff0c\u4f46\u5b83\u4e5f\u6709\u4e00\u4e9b\u9650\u5236\uff1a<\/p>\n<ul>\n<li><strong>\u7d22\u5f15\u5927\u5c0f\uff1a<\/strong>\u7531\u65bc\u591a\u9375\u7d22\u5f15\u6703\u5c0d\u6bcf\u500b\u5143\u7d20\u55ae\u7368\u5efa\u7acb\u7d22\u5f15\uff0c\u8207\u55ae\u503c\u7d22\u5f15\u76f8\u6bd4\uff0c\u5b83\u53ef\u80fd\u5c0e\u81f4\u66f4\u5927\u7684\u7d22\u5f15\u5927\u5c0f\u3002<\/li>\n<li><strong>\u7d22\u5f15\u5efa\u7acb\u6642\u9593\uff1a<\/strong>\u5efa\u7acb\u591a\u9375\u7d22\u5f15\u6240\u9700\u7684\u6642\u9593\u53ef\u80fd\u6bd4\u5efa\u7acb\u55ae\u503c\u7d22\u5f15\u66f4\u9577\uff0c\u56e0\u70ba\u5b83\u9700\u8981\u984d\u5916\u7684\u7d22\u5f15\u958b\u92b7\u3002<\/li>\n<li><strong>\u7d22\u5f15\u7dad\u8b77\uff1a<\/strong>\u96a8\u8457\u9663\u5217\u503c\u7684\u8b8a\u5316\uff0cMongoDB \u9700\u8981\u76f8\u61c9\u5730\u66f4\u65b0\u7d22\u5f15\uff0c\u9019\u53ef\u80fd\u6703\u5f71\u97ff\u5beb\u5165\u6548\u80fd\u3002<\/li>\n<\/ul>\n<h2 id=\"conclusion-UDUgPtYhiA\">\u7d50\u8ad6<\/h2>\n<p>\u591a\u9375\u7d22\u5f15\u662f MongoDB \u4e2d\u7684\u4e00\u500b\u5f37\u5927\u529f\u80fd\uff0c\u5b83\u5141\u8a31\u5c0d\u9663\u5217\u503c\u9032\u884c\u9ad8\u6548\u7684\u67e5\u8a62\u548c\u7d22\u5f15\u3002\u901a\u904e\u5c0d\u9663\u5217\u4e2d\u7684\u500b\u5225\u5143\u7d20\u5efa\u7acb\u7d22\u5f15\uff0c\u591a\u9375\u7d22\u5f15\u63d0\u5347\u4e86\u67e5\u8a62\u6548\u80fd\uff0c\u4e26\u5728\u8cc7\u6599\u5efa\u6a21\u4e0a\u63d0\u4f9b\u4e86\u9748\u6d3b\u6027\u3002\u7136\u800c\uff0c\u5728\u4f7f\u7528\u591a\u9375\u7d22\u5f15\u6642\uff0c\u4e5f\u9700\u8981\u8003\u616e\u4e00\u4e9b\u9650\u5236\uff0c\u4f8b\u5982\u7d22\u5f15\u5927\u5c0f\u548c\u7dad\u8b77\u958b\u92b7\u3002<\/p>\n<p>\u6b32\u4e86\u89e3\u66f4\u591a\u6709\u95dc MongoDB \u53ca\u5176\u529f\u80fd\uff0c\u8acb\u8003\u616e\u63a2\u7d22 <a href=\"https:\/\/server.hk\">Server.HK<\/a>\uff0c\u9019\u662f\u4e00\u5bb6\u9818\u5148\u7684 VPS \u8a17\u7ba1\u516c\u53f8\uff0c\u63d0\u4f9b\u53ef\u9760\u4e14\u9ad8\u6548\u80fd\u7684\u8a17\u7ba1\u89e3\u6c7a\u65b9\u6848\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-21545","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/21545","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=21545"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/21545\/revisions"}],"predecessor-version":[{"id":23910,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/21545\/revisions\/23910"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=21545"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=21545"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=21545"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}