{"id":2506,"date":"2025-03-09T09:49:00","date_gmt":"2025-03-09T01:49:00","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=2506"},"modified":"2025-03-09T12:58:47","modified_gmt":"2025-03-09T04:58:47","slug":"mongodb-%e5%9b%ba%e5%ae%9a%e9%9b%86%e5%90%88%ef%bc%88capped-collections%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2025\/03\/09\/mongodb-%e5%9b%ba%e5%ae%9a%e9%9b%86%e5%90%88%ef%bc%88capped-collections%ef%bc%89\/","title":{"rendered":"MongoDB \u56fa\u5b9a\u96c6\u5408\uff08Capped Collections\uff09"},"content":{"rendered":"\n<p>MongoDB \u4e2d\u7684 <strong>\u56fa\u5b9a\u96c6\u5408<\/strong>\uff08Capped Collections\uff09\u662f\u4e00\u79cd\u5177\u6709\u56fa\u5b9a\u5927\u5c0f\u4e14\u81ea\u52a8\u8986\u76d6\u65e7\u6587\u6863\u7684\u7279\u6b8a\u7c7b\u578b\u7684\u96c6\u5408\u3002\u5b83\u4eec\u662f\u4e3a\u4e86\u5904\u7406\u9ad8\u541e\u5410\u91cf\u7684\u64cd\u4f5c\uff08\u5982\u65e5\u5fd7\u8bb0\u5f55\u3001\u5b9e\u65f6\u76d1\u63a7\u6570\u636e\u7b49\uff09\u800c\u8bbe\u8ba1\u7684\u3002\u56fa\u5b9a\u96c6\u5408\u7684\u7279\u70b9\u662f\u5b83\u4eec\u6709\u4e00\u4e2a\u6700\u5927\u5bb9\u91cf\uff0c\u5e76\u4e14\u5f53\u96c6\u5408\u7684\u5927\u5c0f\u8fbe\u5230\u6700\u5927\u9650\u5236\u65f6\uff0cMongoDB \u4f1a\u81ea\u52a8\u5220\u9664\u6700\u65e7\u7684\u6587\u6863\uff0c\u4ee5\u4fbf\u4e3a\u65b0\u6587\u6863\u817e\u51fa\u7a7a\u95f4\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>1. \u56fa\u5b9a\u96c6\u5408\u7684\u7279\u70b9<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u56fa\u5b9a\u5927\u5c0f<\/strong>\uff1a\u56fa\u5b9a\u96c6\u5408\u5728\u521b\u5efa\u65f6\u5b9a\u4e49\u4e86\u4e00\u4e2a\u6700\u5927\u5927\u5c0f\u3002\u5982\u679c\u96c6\u5408\u7684\u6570\u636e\u91cf\u8fbe\u5230\u8be5\u5927\u5c0f\uff0cMongoDB \u4f1a\u81ea\u52a8\u5220\u9664\u6700\u65e9\u7684\u6587\u6863\uff0c\u4ee5\u4fdd\u6301\u96c6\u5408\u7684\u5927\u5c0f\u4e0d\u53d8\u3002<\/li>\n\n\n\n<li><strong>\u5faa\u73af\u8986\u76d6<\/strong>\uff1a\u56fa\u5b9a\u96c6\u5408\u4f1a\u5728\u6570\u636e\u8fbe\u5230\u6700\u5927\u5927\u5c0f\u65f6\u81ea\u52a8\u8986\u76d6\u6700\u65e7\u7684\u6570\u636e\u3002\u8fd9\u6837\uff0c\u96c6\u5408\u4e2d\u59cb\u7ec8\u53ea\u4f1a\u4fdd\u7559\u6700\u65b0\u7684\u6570\u636e\u3002<\/li>\n\n\n\n<li><strong>\u63d2\u5165\u987a\u5e8f<\/strong>\uff1a\u56fa\u5b9a\u96c6\u5408\u4e2d\u7684\u6587\u6863\u6309\u7167\u63d2\u5165\u987a\u5e8f\u6392\u5217\uff0c\u65b0\u63d2\u5165\u7684\u6587\u6863\u4f1a\u88ab\u6dfb\u52a0\u5230\u96c6\u5408\u7684\u5c3e\u90e8\uff0c\u6700\u65e7\u7684\u6587\u6863\u4f1a\u88ab\u5220\u9664\u3002<\/li>\n\n\n\n<li><strong>\u9ad8\u6548\u7684\u5199\u5165\u6027\u80fd<\/strong>\uff1a\u56fa\u5b9a\u96c6\u5408\u662f\u987a\u5e8f\u5199\u5165\u7684\uff0c\u8fd9\u4f7f\u5f97\u5b83\u4eec\u5728\u9ad8\u541e\u5410\u91cf\u573a\u666f\u4e0b\u8868\u73b0\u4f18\u5f02\uff0c\u5982\u65e5\u5fd7\u8bb0\u5f55\u6216\u65f6\u95f4\u5e8f\u5217\u6570\u636e\u5b58\u50a8\u3002<\/li>\n\n\n\n<li><strong>\u6709\u5e8f\u5b58\u50a8<\/strong>\uff1a\u56fa\u5b9a\u96c6\u5408\u5728\u5b58\u50a8\u6570\u636e\u65f6\u59cb\u7ec8\u4fdd\u6301\u987a\u5e8f\u6027\u3002\u5b83\u4f1a\u786e\u4fdd\u6309\u7167\u63d2\u5165\u7684\u987a\u5e8f\u8fdb\u884c\u6570\u636e\u7684\u5220\u9664\u4e0e\u8986\u76d6\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>2. \u521b\u5efa\u56fa\u5b9a\u96c6\u5408<\/strong><\/h2>\n\n\n\n<p>\u521b\u5efa\u56fa\u5b9a\u96c6\u5408\u65f6\uff0c\u5fc5\u987b\u6307\u5b9a\u96c6\u5408\u7684\u5927\u5c0f\u9650\u5236\u3002\u5927\u5c0f\u53ef\u4ee5\u662f\u4ee5\u5b57\u8282\u4e3a\u5355\u4f4d\u7684\u6570\u503c\uff0c\u4e5f\u53ef\u4ee5\u662f\u4ee5\u6587\u6863\u6570\u76ee\u6765\u9650\u5236\u3002\u4e3a\u4e86\u786e\u4fdd\u96c6\u5408\u662f\u56fa\u5b9a\u5927\u5c0f\uff0c\u5fc5\u987b\u4f7f\u7528 <code>capped<\/code> \u9009\u9879\u3002<\/p>\n\n\n\n<p>\u4ee5\u4e0b\u662f\u521b\u5efa\u56fa\u5b9a\u96c6\u5408\u7684\u793a\u4f8b\uff1a<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>(1) \u4f7f\u7528 MongoDB Shell \u521b\u5efa\u56fa\u5b9a\u96c6\u5408<\/strong><\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>db.createCollection(\"logs\", {\n  capped: true,             \/\/ \u6307\u5b9a\u4e3a\u56fa\u5b9a\u96c6\u5408\n  size: 5242880,            \/\/ \u9650\u5236\u96c6\u5408\u6700\u5927\u5927\u5c0f\u4e3a 5MB\uff085242880 \u5b57\u8282\uff09\n  max: 1000                 \/\/ \u9650\u5236\u6700\u591a\u5b58\u50a8 1000 \u6761\u6587\u6863\n});<\/code><\/pre>\n\n\n\n<p>\u5728\u8fd9\u4e2a\u793a\u4f8b\u4e2d\uff0c<code>logs<\/code> \u96c6\u5408\u88ab\u521b\u5efa\u4e3a\u4e00\u4e2a\u56fa\u5b9a\u96c6\u5408\uff0c\u6700\u5927\u5927\u5c0f\u4e3a 5MB\uff0c\u4e14\u6700\u591a\u53ef\u4ee5\u5b58\u50a8 1000 \u6761\u6587\u6863\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>(2) \u4f7f\u7528 MongoDB \u9a71\u52a8\u7a0b\u5e8f\u521b\u5efa\u56fa\u5b9a\u96c6\u5408<\/strong><\/h3>\n\n\n\n<p>\u5982\u679c\u4f60\u4f7f\u7528 MongoDB \u7684\u9a71\u52a8\u7a0b\u5e8f\uff08\u5982 Node.js\u3001Python \u7b49\uff09\uff0c\u4e5f\u53ef\u4ee5\u901a\u8fc7\u9a71\u52a8\u6765\u521b\u5efa\u56fa\u5b9a\u96c6\u5408\u3002<\/p>\n\n\n\n<p><strong>Node.js \u793a\u4f8b<\/strong>\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>const { MongoClient } = require('mongodb');\n\nasync function createCappedCollection() {\n  const client = new MongoClient('mongodb:\/\/localhost:27017');\n  await client.connect();\n\n  const db = client.db('mydatabase');\n\n  \/\/ \u521b\u5efa\u56fa\u5b9a\u96c6\u5408\n  await db.createCollection('logs', {\n    capped: true,\n    size: 5242880,   \/\/ 5MB\n    max: 1000        \/\/ 1000 \u6761\u6587\u6863\n  });\n\n  console.log(\"Fixed collection created.\");\n  await client.close();\n}\n\ncreateCappedCollection();<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>3. \u56fa\u5b9a\u96c6\u5408\u7684\u64cd\u4f5c<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u63d2\u5165\u6587\u6863<\/strong>\uff1a\u4f60\u53ef\u4ee5\u50cf\u666e\u901a\u96c6\u5408\u4e00\u6837\u5411\u56fa\u5b9a\u96c6\u5408\u63d2\u5165\u6587\u6863\uff0c\u5f53\u96c6\u5408\u8fbe\u5230\u6700\u5927\u5927\u5c0f\u65f6\uff0cMongoDB \u4f1a\u81ea\u52a8\u5220\u9664\u6700\u65e7\u7684\u6587\u6863\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>  db.logs.insert({ message: \"New log entry\", timestamp: new Date() });<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u8bfb\u53d6\u6587\u6863<\/strong>\uff1a\u56fa\u5b9a\u96c6\u5408\u53ef\u4ee5\u50cf\u666e\u901a\u96c6\u5408\u4e00\u6837\u8fdb\u884c\u67e5\u8be2\u3002\u4f60\u53ef\u4ee5\u4f7f\u7528\u4efb\u4f55\u5408\u6cd5\u7684\u67e5\u8be2\u64cd\u4f5c\u7b26\u8fdb\u884c\u6570\u636e\u68c0\u7d22\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>  db.logs.find({}).sort({ timestamp: -1 });<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u5220\u9664\u6587\u6863<\/strong>\uff1a\u867d\u7136\u56fa\u5b9a\u96c6\u5408\u4f1a\u81ea\u52a8\u5220\u9664\u65e7\u6587\u6863\uff0c\u4f46\u4f60\u4e5f\u53ef\u4ee5\u624b\u52a8\u5220\u9664\u6587\u6863\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>  db.logs.remove({ message: \"Old log entry\" });<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u66f4\u65b0\u6587\u6863<\/strong>\uff1a\u4f60\u53ef\u4ee5\u5728\u56fa\u5b9a\u96c6\u5408\u4e2d\u66f4\u65b0\u6587\u6863\uff0c\u4f46\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u66f4\u65b0\u64cd\u4f5c\u4e0d\u4f1a\u6539\u53d8\u96c6\u5408\u7684\u6700\u5927\u5bb9\u91cf\u9650\u5236\u3002<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>  db.logs.update({ _id: ObjectId(\"5f8d0d55b54764421b7156b6\") }, { $set: { message: \"Updated log entry\" } });<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>4. \u56fa\u5b9a\u96c6\u5408\u7684\u4f18\u52bf<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u9ad8\u6548\u7684\u5199\u5165\u64cd\u4f5c<\/strong>\uff1a\u7531\u4e8e\u56fa\u5b9a\u96c6\u5408\u6309\u7167\u987a\u5e8f\u5199\u5165\u6570\u636e\u4e14\u4e0d\u9700\u8981\u8fdb\u884c\u7d22\u5f15\u7ef4\u62a4\uff0c\u5b83\u4eec\u5bf9\u4e8e\u9700\u8981\u9891\u7e41\u5199\u5165\u6570\u636e\u7684\u5e94\u7528\uff08\u5982\u65e5\u5fd7\u8bb0\u5f55\u3001\u76d1\u63a7\u3001\u4e8b\u4ef6\u8bb0\u5f55\u7b49\uff09\u975e\u5e38\u9002\u5408\u3002<\/li>\n\n\n\n<li><strong>\u81ea\u52a8\u7ba1\u7406\u7a7a\u95f4<\/strong>\uff1a\u56fa\u5b9a\u96c6\u5408\u5728\u8fbe\u5230\u6700\u5927\u5927\u5c0f\u65f6\u4f1a\u81ea\u52a8\u5220\u9664\u6700\u65e7\u7684\u6587\u6863\uff0c\u907f\u514d\u4e86\u624b\u52a8\u7ba1\u7406\u6570\u636e\u7a7a\u95f4\u7684\u9ebb\u70e6\u3002<\/li>\n\n\n\n<li><strong>\u5185\u5b58\u53cb\u597d<\/strong>\uff1a\u7531\u4e8e\u56fa\u5b9a\u96c6\u5408\u7684\u5927\u5c0f\u662f\u56fa\u5b9a\u7684\uff0c\u5b83\u4eec\u80fd\u591f\u9650\u5236\u6570\u636e\u5e93\u7684\u5927\u5c0f\uff0c\u9632\u6b62\u56e0\u6570\u636e\u589e\u957f\u8fc7\u5feb\u800c\u5360\u7528\u8fc7\u591a\u5b58\u50a8\u7a7a\u95f4\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>5. \u56fa\u5b9a\u96c6\u5408\u7684\u9650\u5236<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u65e0\u6cd5\u6269\u5c55\u5927\u5c0f<\/strong>\uff1a\u4e00\u65e6\u56fa\u5b9a\u96c6\u5408\u8fbe\u5230\u6700\u5927\u5927\u5c0f\uff0c\u5c31\u65e0\u6cd5\u6269\u5c55\u5176\u5927\u5c0f\u3002\u5982\u679c\u9700\u8981\u589e\u52a0\u96c6\u5408\u7684\u5927\u5c0f\uff0c\u5fc5\u987b\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u96c6\u5408\u3002<\/li>\n\n\n\n<li><strong>\u5220\u9664\u64cd\u4f5c\u53d7\u9650<\/strong>\uff1a\u867d\u7136\u4f60\u53ef\u4ee5\u5220\u9664\u6587\u6863\uff0c\u4f46 MongoDB \u4f1a\u4f18\u5148\u5220\u9664\u6700\u65e7\u7684\u6587\u6863\u3002\u5982\u679c\u4f60\u5220\u9664\u6587\u6863\u65f6\u672a\u8fbe\u5230\u6700\u5927\u5bb9\u91cf\uff0cMongoDB \u4e0d\u4f1a\u8c03\u6574\u96c6\u5408\u5927\u5c0f\u3002<\/li>\n\n\n\n<li><strong>\u4e0d\u53ef\u4fee\u6539\u5927\u5c0f<\/strong>\uff1a\u521b\u5efa\u56fa\u5b9a\u96c6\u5408\u540e\uff0c\u65e0\u6cd5\u4fee\u6539\u96c6\u5408\u7684\u5927\u5c0f\u3002\u4f60\u53ea\u80fd\u901a\u8fc7\u5220\u9664\u73b0\u6709\u96c6\u5408\u5e76\u91cd\u65b0\u521b\u5efa\u6765\u8c03\u6574\u5927\u5c0f\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>6. \u4f7f\u7528\u573a\u666f<\/strong><\/h2>\n\n\n\n<p>\u56fa\u5b9a\u96c6\u5408\u975e\u5e38\u9002\u7528\u4e8e\u4ee5\u4e0b\u573a\u666f\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u65e5\u5fd7\u8bb0\u5f55<\/strong>\uff1a\u9002\u5408\u5b58\u50a8\u5e94\u7528\u7a0b\u5e8f\u6216\u670d\u52a1\u5668\u7684\u65e5\u5fd7\uff0c\u80fd\u591f\u81ea\u52a8\u6e05\u7406\u8fc7\u671f\u65e5\u5fd7\uff0c\u786e\u4fdd\u96c6\u5408\u59cb\u7ec8\u4fdd\u6709\u6700\u65b0\u7684\u65e5\u5fd7\u6570\u636e\u3002<\/li>\n\n\n\n<li><strong>\u65f6\u95f4\u5e8f\u5217\u6570\u636e<\/strong>\uff1a\u5bf9\u4e8e\u9700\u8981\u5b9a\u671f\u63d2\u5165\u5e76\u5220\u9664\u5386\u53f2\u6570\u636e\u7684\u5e94\u7528\uff0c\u56fa\u5b9a\u96c6\u5408\u975e\u5e38\u9002\u7528\u3002\u4f8b\u5982\uff0c\u76d1\u63a7\u7cfb\u7edf\u7684\u6570\u636e\u6536\u96c6\u3002<\/li>\n\n\n\n<li><strong>\u7f13\u5b58\u6570\u636e<\/strong>\uff1a\u5b58\u50a8\u77ed\u671f\u7f13\u5b58\u6570\u636e\uff0c\u786e\u4fdd\u7f13\u5b58\u5927\u5c0f\u56fa\u5b9a\u5e76\u4e14\u81ea\u52a8\u6e05\u7406\u6700\u65e7\u7684\u7f13\u5b58\u6761\u76ee\u3002<\/li>\n\n\n\n<li><strong>\u5b9e\u65f6\u6570\u636e\u5904\u7406<\/strong>\uff1a\u5728\u5b9e\u65f6\u5206\u6790\u7cfb\u7edf\u4e2d\uff0c\u56fa\u5b9a\u96c6\u5408\u53ef\u4ee5\u4f5c\u4e3a\u4e34\u65f6\u5b58\u50a8\uff0c\u7528\u4e8e\u5b58\u653e\u6b63\u5728\u5904\u7406\u7684\u6570\u636e\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>7. \u603b\u7ed3<\/strong><\/h2>\n\n\n\n<p>MongoDB \u7684 <strong>\u56fa\u5b9a\u96c6\u5408\uff08Capped Collections\uff09<\/strong> 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Collections\uff09\u662f\u4e00\u79cd\u5177\u6709\u56fa\u5b9a\u5927\u5c0f\u4e14\u81ea\u52a8\u8986\u76d6\u65e7\u6587\u6863\u7684\u7279\u6b8a [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":2533,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[77],"tags":[],"class_list":["post-2506","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mongodb"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2506","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/comments?post=2506"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2506\/revisions"}],"predecessor-version":[{"id":2507,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/2506\/revisions\/2507"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media\/2533"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=2506"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=2506"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=2506"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}