{"id":185048,"date":"2024-11-10T18:18:19","date_gmt":"2024-11-10T10:18:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/185048\/"},"modified":"2024-11-10T18:18:20","modified_gmt":"2024-11-10T10:18:20","slug":"%e4%bd%bf%e7%94%a8redis%e7%b4%a2%e5%bc%95%e6%9f%a5%e6%89%be%e9%81%8e%e5%a4%a7%e7%9a%84key%ef%bc%88redis%e6%9f%a5%e6%89%be%e9%81%8e%e5%a4%a7key%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/185048\/","title":{"rendered":"\u4f7f\u7528Redis\u7d22\u5f15\u67e5\u627e\u904e\u5927\u7684key\uff08redis\u67e5\u627e\u904e\u5927key\uff09"},"content":{"rendered":"<h1 id=\"%e4%bd%bf%e7%94%a8redis%e7%b4%a2%e5%bc%95%e6%9f%a5%e6%89%be%e9%81%8e%e5%a4%a7%e7%9a%84key%ef%bc%88redis%e6%9f%a5%e6%89%be%e9%81%8e%e5%a4%a7key%ef%bc%89-zLkSYNtXlr\">\u4f7f\u7528Redis\u7d22\u5f15\u67e5\u627e\u904e\u5927\u7684key\uff08redis\u67e5\u627e\u904e\u5927key\uff09<\/h1>\n<p>\u5728\u7576\u4eca\u7684\u6578\u64da\u9a45\u52d5\u4e16\u754c\u4e2d\uff0cRedis\u4f5c\u70ba\u4e00\u500b\u9ad8\u6548\u7684\u5167\u5b58\u6578\u64da\u5eab\uff0c\u5ee3\u6cdb\u61c9\u7528\u65bc\u5404\u7a2e\u5834\u666f\uff0c\u5305\u62ec\u7de9\u5b58\u3001\u6d88\u606f\u968a\u5217\u548c\u6578\u64da\u5b58\u5132\u7b49\u3002\u7136\u800c\uff0c\u96a8\u8457\u6578\u64da\u91cf\u7684\u589e\u9577\uff0c\u5982\u4f55\u6709\u6548\u5730\u67e5\u627e\u548c\u7ba1\u7406\u904e\u5927\u7684key\u6210\u70ba\u4e86\u4e00\u500b\u91cd\u8981\u7684\u8ab2\u984c\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u4f7f\u7528Redis\u7d22\u5f15\u4f86\u67e5\u627e\u904e\u5927\u7684key\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u6280\u5de7\u548c\u793a\u4f8b\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e9%81%8e%e5%a4%a7%e7%9a%84key%ef%bc%9f-zLkSYNtXlr\">\u4ec0\u9ebc\u662f\u904e\u5927\u7684key\uff1f<\/h2>\n<p>\u5728Redis\u4e2d\uff0ckey\u7684\u5927\u5c0f\u53ef\u80fd\u6703\u5f71\u97ff\u6027\u80fd\u548c\u5167\u5b58\u4f7f\u7528\u3002\u904e\u5927\u7684key\u901a\u5e38\u6307\u7684\u662f\u90a3\u4e9b\u4f54\u7528\u5927\u91cf\u5167\u5b58\u7684key\uff0c\u9019\u4e9bkey\u53ef\u80fd\u6703\u5c0e\u81f4\u67e5\u627e\u901f\u5ea6\u8b8a\u6162\uff0c\u751a\u81f3\u5f71\u97ff\u6574\u500bRedis\u5be6\u4f8b\u7684\u6027\u80fd\u3002\u4e00\u822c\u4f86\u8aaa\uff0ckey\u7684\u5927\u5c0f\u61c9\u8a72\u4fdd\u6301\u5728\u5408\u7406\u7bc4\u570d\u5167\uff0c\u4ee5\u78ba\u4fdd\u9ad8\u6548\u7684\u6578\u64da\u5b58\u53d6\u3002<\/p>\n<h2 id=\"%e7%82%ba%e4%bb%80%e9%ba%bc%e9%9c%80%e8%a6%81%e6%9f%a5%e6%89%be%e9%81%8e%e5%a4%a7%e7%9a%84key%ef%bc%9f-zLkSYNtXlr\">\u70ba\u4ec0\u9ebc\u9700\u8981\u67e5\u627e\u904e\u5927\u7684key\uff1f<\/h2>\n<ul>\n<li><strong>\u6027\u80fd\u512a\u5316\uff1a<\/strong>\u904e\u5927\u7684key\u6703\u5f71\u97ff\u67e5\u8a62\u901f\u5ea6\uff0c\u5c0e\u81f4\u61c9\u7528\u7a0b\u5e8f\u7684\u6027\u80fd\u4e0b\u964d\u3002<\/li>\n<li><strong>\u5167\u5b58\u7ba1\u7406\uff1a<\/strong>\u4e86\u89e3\u54ea\u4e9bkey\u4f54\u7528\u5927\u91cf\u5167\u5b58\u53ef\u4ee5\u5e6b\u52a9\u9032\u884c\u66f4\u597d\u7684\u5167\u5b58\u7ba1\u7406\uff0c\u907f\u514d\u5167\u5b58\u6ea2\u51fa\u3002<\/li>\n<li><strong>\u6578\u64da\u6e05\u7406\uff1a<\/strong>\u5b9a\u671f\u67e5\u627e\u548c\u6e05\u7406\u904e\u5927\u7684key\u53ef\u4ee5\u91cb\u653e\u5167\u5b58\uff0c\u4fdd\u6301Redis\u7684\u9ad8\u6548\u904b\u884c\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e6%9f%a5%e6%89%be%e9%81%8e%e5%a4%a7%e7%9a%84key-zLkSYNtXlr\">\u5982\u4f55\u67e5\u627e\u904e\u5927\u7684key<\/h2>\n<p>Redis\u672c\u8eab\u4e26\u4e0d\u63d0\u4f9b\u76f4\u63a5\u67e5\u627e\u904e\u5927key\u7684\u547d\u4ee4\uff0c\u4f46\u6211\u5011\u53ef\u4ee5\u901a\u904e\u4e00\u4e9b\u65b9\u6cd5\u4f86\u5be6\u73fe\u9019\u4e00\u76ee\u6a19\u3002\u4ee5\u4e0b\u662f\u5e7e\u7a2e\u5e38\u7528\u7684\u65b9\u6cd5\uff1a<\/p>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8redis%e7%9a%84%e5%85%a7%e5%bb%ba%e5%91%bd%e4%bb%a4-zLkSYNtXlr\">1. \u4f7f\u7528Redis\u7684\u5167\u5efa\u547d\u4ee4<\/h3>\n<p>\u53ef\u4ee5\u4f7f\u7528<code>MEMORY USAGE<\/code>\u547d\u4ee4\u4f86\u67e5\u8a62\u7279\u5b9akey\u7684\u5167\u5b58\u4f7f\u7528\u60c5\u6cc1\u3002\u9019\u6a23\u53ef\u4ee5\u5e6b\u52a9\u6211\u5011\u8b58\u5225\u54ea\u4e9bkey\u4f54\u7528\u4e86\u904e\u591a\u7684\u5167\u5b58\u3002<\/p>\n<pre><code>MEMORY USAGE key_name<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u82e5\u8981\u67e5\u8a62\u540d\u70ba\u201cuser:1001\u201d\u7684key\u7684\u5167\u5b58\u4f7f\u7528\u60c5\u6cc1\uff0c\u53ef\u4ee5\u57f7\u884c\uff1a<\/p>\n<pre><code>MEMORY USAGE user:1001<\/code><\/pre>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8scan%e5%91%bd%e4%bb%a4%e9%81%8d%e6%ad%b7%e6%89%80%e6%9c%89key-zLkSYNtXlr\">2. \u4f7f\u7528SCAN\u547d\u4ee4\u904d\u6b77\u6240\u6709key<\/h3>\n<p>\u7531\u65bcRedis\u7684<code>KEYS<\/code>\u547d\u4ee4\u5728\u5927\u6578\u64da\u96c6\u4e0a\u6548\u7387\u4f4e\u4e0b\uff0c\u56e0\u6b64\u5efa\u8b70\u4f7f\u7528<code>SCAN<\/code>\u547d\u4ee4\u4f86\u904d\u6b77\u6240\u6709key\u3002\u53ef\u4ee5\u7d50\u5408<code>MEMORY USAGE<\/code>\u547d\u4ee4\u4f86\u67e5\u627e\u904e\u5927\u7684key\u3002<\/p>\n<pre><code>\nSCAN 0 MATCH * COUNT 1000\n<\/code><\/pre>\n<p>\u9019\u6a23\u53ef\u4ee5\u5206\u6279\u6b21\u7372\u53d6key\uff0c\u7136\u5f8c\u5c0d\u6bcf\u500bkey\u4f7f\u7528<code>MEMORY USAGE<\/code>\u547d\u4ee4\u4f86\u6aa2\u67e5\u5176\u5167\u5b58\u4f7f\u7528\u60c5\u6cc1\u3002<\/p>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8redis%e7%9a%84lua%e8%85%b3%e6%9c%ac-zLkSYNtXlr\">3. \u4f7f\u7528Redis\u7684Lua\u8173\u672c<\/h3>\n<p>\u53ef\u4ee5\u7de8\u5bebLua\u8173\u672c\u4f86\u81ea\u52d5\u5316\u67e5\u627e\u904e\u5927\u7684key\u7684\u904e\u7a0b\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u793a\u4f8b\uff1a<\/p>\n<pre><code>\nlocal cursor = \"0\"\nlocal large_keys = {}\nlocal threshold = 1024 * 1024 -- \u8a2d\u5b9a\u95be\u503c\u70ba1MB\n\nrepeat\n    local result = redis.call(\"SCAN\", cursor, \"MATCH\", \"*\", \"COUNT\", 1000)\n    cursor = result[1]\n    for _, key in ipairs(result[2]) do\n        if redis.call(\"MEMORY\", \"USAGE\", key) &gt; threshold then\n            table.insert(large_keys, key)\n        end\n    end\nuntil cursor == \"0\"\n\nreturn large_keys\n<\/code><\/pre>\n<p>\u9019\u6bb5\u8173\u672c\u5c07\u8fd4\u56de\u6240\u6709\u4f54\u7528\u5167\u5b58\u8d85\u904e1MB\u7684key\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-zLkSYNtXlr\">\u7d50\u8ad6<\/h2>\n<p>\u67e5\u627e\u904e\u5927\u7684key\u662fRedis\u6027\u80fd\u512a\u5316\u548c\u5167\u5b58\u7ba1\u7406\u7684\u91cd\u8981\u6b65\u9a5f\u3002\u901a\u904e\u4f7f\u7528Redis\u7684\u5167\u5efa\u547d\u4ee4\u3001\u904d\u6b77\u6240\u6709key\u4ee5\u53ca\u7de8\u5bebLua\u8173\u672c\uff0c\u6211\u5011\u53ef\u4ee5\u6709\u6548\u5730\u8b58\u5225\u548c\u7ba1\u7406\u9019\u4e9bkey\u3002\u9019\u4e0d\u50c5\u80fd\u63d0\u9ad8Redis\u7684\u6027\u80fd\uff0c\u9084\u80fd\u78ba\u4fdd\u7cfb\u7d71\u7684\u7a69\u5b9a\u904b\u884c\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u89e3\u6c7a\u65b9\u6848\u4f86\u7ba1\u7406\u60a8\u7684\u6578\u64da\uff0c\u8003\u616e\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u670d\u52d9\uff0c\u9019\u5c07\u70ba\u60a8\u7684\u61c9\u7528\u63d0\u4f9b\u7a69\u5b9a\u7684\u652f\u6301\u548c\u512a\u5316\u7684\u6027\u80fd\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4f7f\u7528Redis\u7d22\u5f15\u5feb\u901f\u67e5\u627e\u904e\u5927\u7684key\uff0c\u63d0\u5347\u6027\u80fd\uff0c\u512a\u5316\u5b58\u5132\uff0c\u907f\u514d\u5167\u5b58\u6d6a\u8cbb\uff0c\u78ba\u4fdd\u6578\u64da\u7ba1\u7406\u9ad8\u6548\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-185048","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/185048","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=185048"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/185048\/revisions"}],"predecessor-version":[{"id":185049,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/185048\/revisions\/185049"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=185048"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=185048"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=185048"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}