{"id":21534,"date":"2024-01-02T11:02:28","date_gmt":"2024-01-02T11:02:28","guid":{"rendered":"https:\/\/server.hk\/blog\/21534\/"},"modified":"2024-11-14T10:31:08","modified_gmt":"2024-11-14T02:31:08","slug":"mongodb-glossary-mmapv1","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/21534\/","title":{"rendered":"MongoDB \u8a5e\u5f59\u8868 &#8211; MMAPv1"},"content":{"rendered":"<h1 id=\"mongodb-glossary-mmapv1-MzCOkEkblf\">MongoDB \u8a5e\u5f59\u8868 &#8211; MMAPv1<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7684\u4e16\u754c\u4e2d\uff0cMongoDB \u56e0\u5176\u9748\u6d3b\u6027\u3001\u53ef\u64f4\u5c55\u6027\u53ca\u6027\u80fd\u800c\u53d7\u5230\u5ee3\u6cdb\u6b61\u8fce\u3002MongoDB \u7684\u9ad8\u6548\u904b\u4f5c\uff0c\u5176\u4e2d\u4e00\u500b\u95dc\u9375\u7d44\u4ef6\u4fbf\u662f\u5176\u5b58\u5132\u5f15\u64ce\u3002MongoDB \u63d0\u4f9b\u591a\u500b\u5b58\u5132\u5f15\u64ce\uff0c\u6bcf\u500b\u90fd\u6709\u5176\u81ea\u8eab\u7684\u7279\u9ede\u548c\u529f\u80fd\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5176\u4e2d\u4e00\u500b\u5b58\u5132\u5f15\u64ce\uff0c\u540d\u70ba MMAPv1\u3002<\/p>\n<h2 id=\"what-is-mmapv1-MzCOkEkblf\">\u4ec0\u9ebc\u662f MMAPv1\uff1f<\/h2>\n<p>MMAPv1 \u662f MongoDB 3.2 \u7248\u672c\u4e4b\u524d\u7684\u9ed8\u8a8d\u5b58\u5132\u5f15\u64ce\u3002MMAPv1 \u4ee3\u8868 &#8220;Memory-Mapped Files Version 1&#8243;\uff0c\u57fa\u65bc\u64cd\u4f5c\u7cfb\u7d71\u63d0\u4f9b\u7684\u5167\u5b58\u6620\u5c04\u6280\u8853\u3002\u6b64\u5b58\u5132\u5f15\u64ce\u5c07\u6578\u64da\u6587\u4ef6\u76f4\u63a5\u6620\u5c04\u5230\u5167\u5b58\u4e2d\uff0c\u5f9e\u800c\u5be6\u73fe\u9ad8\u6548\u7684\u8b80\u5beb\u64cd\u4f5c\u3002<\/p>\n<h2 id=\"how-does-mmapv1-work-MzCOkEkblf\">MMAPv1 \u5982\u4f55\u904b\u4f5c\uff1f<\/h2>\n<p>\u7576 MongoDB \u4f7f\u7528 MMAPv1 \u5b58\u5132\u5f15\u64ce\u6642\uff0c\u5b83\u6703\u5c07\u6578\u64da\u5206\u70ba\u56fa\u5b9a\u5927\u5c0f\u7684\u584a\uff0c\u7a31\u70ba\u9801\u9762\u3002\u9019\u4e9b\u9801\u9762\u7684\u5927\u5c0f\u901a\u5e38\u70ba 4KB\uff0c\u662f\u53ef\u8b80\u5beb\u7684\u6700\u5c0f\u6578\u64da\u55ae\u5143\u3002\u96a8\u5f8c\uff0c\u6578\u64da\u6587\u4ef6\u6703\u6620\u5c04\u5230\u865b\u64ec\u5167\u5b58\u4e2d\uff0cMongoDB \u53ef\u4ee5\u50cf\u8a2a\u554f RAM \u4e00\u6a23\u8a2a\u554f\u9019\u4e9b\u6578\u64da\u6587\u4ef6\u3002<\/p>\n<p>\u7576\u57f7\u884c\u8b80\u53d6\u64cd\u4f5c\u6642\uff0cMongoDB \u6703\u6aa2\u67e5\u8acb\u6c42\u7684\u6578\u64da\u662f\u5426\u5df2\u7d93\u5728\u5167\u5b58\u4e2d\u3002\u5982\u679c\u6578\u64da\u5df2\u5728\u5167\u5b58\u4e2d\uff0c\u5247\u76f4\u63a5\u5f9e RAM \u4e2d\u6aa2\u7d22\u6578\u64da\uff0c\u5f9e\u800c\u52a0\u5feb\u8b80\u53d6\u901f\u5ea6\u3002\u5982\u679c\u6578\u64da\u4e0d\u5728\u5167\u5b58\u4e2d\uff0cMongoDB \u6703\u5f9e\u78c1\u789f\u4e2d\u7372\u53d6\u6240\u9700\u7684\u9801\u9762\uff0c\u5c07\u5176\u8f09\u5165\u5167\u5b58\u5f8c\u518d\u8fd4\u56de\u8acb\u6c42\u7684\u6578\u64da\u3002<\/p>\n<p>\u985e\u4f3c\u5730\uff0c\u7576\u57f7\u884c\u5beb\u5165\u64cd\u4f5c\u6642\uff0cMongoDB \u5c07\u6578\u64da\u5beb\u5165\u5167\u5b58\u4e2d\u7684\u5167\u5b58\u6620\u5c04\u6587\u4ef6\u3002\u66f4\u6539\u5167\u5bb9\u6703\u5b9a\u671f\u5237\u65b0\u5230\u78c1\u789f\uff0c\u4ee5\u78ba\u4fdd\u6578\u64da\u7684\u6301\u4e45\u6027\u3002\u9019\u7a2e\u5ef6\u9072\u5beb\u5165\u6a5f\u5236\u88ab\u7a31\u70ba &#8220;\u5beb\u5165\u6642\u8907\u88fd&#8221;\uff08copy-on-write\uff09\uff0c\u5176\u53ef\u4ee5\u907f\u514d\u983b\u7e41\u7684\u78c1\u789f\u5beb\u5165\uff0c\u5f9e\u800c\u63d0\u5347\u5beb\u5165\u6548\u7387\u3002<\/p>\n<h2 id=\"advantages-of-mmapv1-MzCOkEkblf\">MMAPv1 \u7684\u512a\u52e2<\/h2>\n<p>MMAPv1 \u63d0\u4f9b\u4e86\u591a\u7a2e\u512a\u52e2\uff0c\u4f7f\u5176\u6210\u70ba\u8a31\u591a MongoDB \u90e8\u7f72\u4e2d\u7684\u53d7\u6b61\u8fce\u9078\u64c7\uff1a<\/p>\n<ul>\n<li><strong>\u517c\u5bb9\u6027\uff1a<\/strong>MMAPv1 \u8207\u5ee3\u6cdb\u7684\u786c\u9ad4\u548c\u64cd\u4f5c\u7cfb\u7d71\u517c\u5bb9\uff0c\u4f7f\u5176\u6210\u70ba\u5404\u7a2e\u74b0\u5883\u4e2d\u7684\u53ef\u9760\u9078\u64c7\u3002<\/li>\n<li><strong>\u5167\u5b58\u7ba1\u7406\uff1a<\/strong>MMAPv1 \u5229\u7528\u4e86\u64cd\u4f5c\u7cfb\u7d71\u7684\u865b\u64ec\u5167\u5b58\u7ba1\u7406\uff0c\u80fd\u5920\u9ad8\u6548\u8655\u7406\u5927\u578b\u6578\u64da\u96c6\u3002<\/li>\n<li><strong>\u4e26\u767c\u63a7\u5236\uff1a<\/strong>MMAPv1 \u4f7f\u7528\u591a\u7248\u672c\u4e26\u767c\u63a7\u5236\uff08MVCC\uff09\u6a5f\u5236\u4f86\u8655\u7406\u4e26\u767c\u8b80\u5beb\u64cd\u4f5c\uff0c\u78ba\u4fdd\u6578\u64da\u4e00\u81f4\u6027\u3002<\/li>\n<li><strong>\u9748\u6d3b\u7684\u7de9\u5b58\uff1a<\/strong>MMAPv1 \u5229\u7528\u64cd\u4f5c\u7cfb\u7d71\u7684\u6587\u4ef6\u7cfb\u7d71\u7de9\u5b58\uff0c\u6839\u64da\u4f7f\u7528\u6a21\u5f0f\u81ea\u52d5\u7ba1\u7406\u5167\u5b58\u4e2d\u7684\u6578\u64da\u3002<\/li>\n<\/ul>\n<h2 id=\"limitations-of-mmapv1-MzCOkEkblf\">MMAPv1 \u7684\u9650\u5236<\/h2>\n<p>\u5118\u7ba1 MMAPv1 \u64c1\u6709\u8a31\u591a\u512a\u52e2\uff0c\u4f46\u5b83\u4e5f\u5b58\u5728\u4e00\u4e9b\u9650\u5236\uff0c\u9019\u5c0e\u81f4\u4e86\u5982 WiredTiger \u7b49\u66ff\u4ee3\u5b58\u5132\u5f15\u64ce\u7684\u958b\u767c\uff1a<\/p>\n<ul>\n<li><strong>\u5167\u5b58\u4f7f\u7528\uff1a<\/strong>MMAPv1 \u6703\u5c07\u6574\u500b\u6578\u64da\u6587\u4ef6\u6620\u5c04\u5230\u5167\u5b58\u4e2d\uff0c\u9019\u53ef\u80fd\u5c0d\u65bc\u5927\u578b\u6578\u64da\u96c6\u800c\u8a00\u6703\u6d88\u8017\u5927\u91cf\u5167\u5b58\u3002<\/li>\n<li><strong>\u9396\u5b9a\u6a5f\u5236\uff1a<\/strong>MMAPv1 \u4f7f\u7528\u5168\u5c40\u5beb\u9396\uff0c\u9019\u53ef\u80fd\u6703\u5f71\u97ff\u9ad8\u4f75\u767c\u74b0\u5883\u4e2d\u7684\u5beb\u5165\u64f4\u5c55\u6027\u3002<\/li>\n<li><strong>\u6027\u80fd\u554f\u984c\uff1a<\/strong>\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0cMMAPv1 \u7684\u6027\u80fd\u53ef\u80fd\u4e0d\u53ca\u5982 WiredTiger \u7b49\u8f03\u65b0\u7684\u5b58\u5132\u5f15\u64ce\u3002<\/li>\n<\/ul>\n<h2 id=\"conclusion-MzCOkEkblf\">\u7d50\u8ad6<\/h2>\n<p>MMAPv1 \u662f MongoDB \u4e2d\u53ef\u9760\u4e14\u5ee3\u6cdb\u4f7f\u7528\u7684\u5b58\u5132\u5f15\u64ce\u3002\u5b83\u63d0\u4f9b\u4e86\u826f\u597d\u7684\u517c\u5bb9\u6027\u3001\u5167\u5b58\u7ba1\u7406\u3001\u4e26\u767c\u63a7\u5236\u53ca\u9748\u6d3b\u7684\u7de9\u5b58\u529f\u80fd\u3002\u7136\u800c\uff0c\u5b83\u5728\u5167\u5b58\u4f7f\u7528\u3001\u9396\u5b9a\u6a5f\u5236\u53ca\u6027\u80fd\u65b9\u9762\u7684\u9650\u5236\u4e5f\u4fc3\u4f7f\u4e86\u5982 WiredTiger \u7b49\u5b58\u5132\u5f15\u64ce\u7684\u767c\u5c55\uff0c\u9019\u4e9b\u65b0\u5f15\u64ce\u63d0\u4f9b\u4e86\u66f4\u591a\u7684\u529f\u80fd\u548c\u66f4\u4f73\u7684\u6027\u80fd\uff0c\u9069\u7528\u65bc\u7279\u5b9a\u7684\u4f7f\u7528\u5834\u666f\u3002<\/p>\n<p>\u5982\u6b32\u7372\u53d6\u6709\u95dc MongoDB \u53ca VPS \u8a17\u7ba1\u65b9\u6848\u7684\u66f4\u591a\u8cc7\u8a0a\uff0c\u5efa\u8b70\u700f\u89bd <a href=\"https:\/\/server.hk\">Server.HK<\/a>\uff0c\u4ed6\u5011\u662f\u9818\u5148\u7684 VPS \u8a17\u7ba1\u516c\u53f8\uff0c\u63d0\u4f9b\u53ef\u9760\u4e14\u53ef\u64f4\u5c55\u7684\u8a17\u7ba1\u670d\u52d9\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-21534","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/21534","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=21534"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/21534\/revisions"}],"predecessor-version":[{"id":23926,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/21534\/revisions\/23926"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=21534"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=21534"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=21534"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}