{"id":200109,"date":"2025-05-06T11:59:26","date_gmt":"2025-05-06T03:59:26","guid":{"rendered":"https:\/\/server.hk\/cnblog\/200109\/"},"modified":"2025-05-06T11:59:26","modified_gmt":"2025-05-06T03:59:26","slug":"%e5%a6%82%e4%bd%95%e5%9c%a8mysql%e4%b8%ad%e5%a4%a7%e8%a7%84%e6%a8%a1%e6%b3%a8%e5%85%a5%e7%ae%80%e5%8d%95%e7%9a%84%e8%99%9a%e6%8b%9f%e6%95%b0%e6%8d%ae","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/200109\/","title":{"rendered":"\u5982\u4f55\u5728MySQL\u4e2d\u5927\u89c4\u6a21\u6ce8\u5165\u7b80\u5355\u7684\u865a\u62df\u6570\u636e"},"content":{"rendered":"

<\/b> <\/p>\n

\u5982\u4f55\u5728MySQL\u4e2d\u5927\u89c4\u6a21\u6ce8\u5165\u7b80\u5355\u7684\u865a\u62df\u6570\u636e<\/h1>\n

\u672c\u7bc7\u6587\u7ae0\u7ed9\u5927\u5bb6\u5206\u4eab\u300a\u5982\u4f55\u5728MySQL\u4e2d\u5927\u89c4\u6a21\u6ce8\u5165\u7b80\u5355\u7684\u865a\u62df\u6570\u636e\u300b\uff0c\u8986\u76d6\u4e86\u6570\u636e\u5e93\u7684\u5e38\u89c1\u57fa\u7840\u77e5\u8bc6\uff0c\u5176\u5b9e\u4e00\u4e2a\u8bed\u8a00\u7684\u5168\u90e8\u77e5\u8bc6\u70b9\u4e00\u7bc7\u6587\u7ae0\u662f\u4e0d\u53ef\u80fd\u8bf4\u5b8c\u7684\uff0c\u4f46\u5e0c\u671b\u901a\u8fc7\u8fd9\u4e9b\u95ee\u9898\uff0c\u8ba9\u8bfb\u8005\u5bf9\u81ea\u5df1\u7684\u638c\u63e1\u7a0b\u5ea6\u6709\u4e00\u5b9a\u7684\u8ba4\u8bc6(B \u6570)\uff0c\u4ece\u800c\u5f25\u8865\u81ea\u5df1\u7684\u4e0d\u8db3\uff0c\u66f4\u597d\u7684\u638c\u63e1\u5b83\u3002<\/p>\n

<\/p>\n

\u4ecb\u7ecd <\/h2>\n

\u662f\u5426\u66fe\u7ecf\u53d1\u73b0\u81ea\u5df1\u5904\u4e8e\u9700\u8981\u5927\u91cf\u865a\u62df\u6570\u636e\u8fdb\u884c\u6d4b\u8bd5\uff0c\u4f46\u53c8\u4e0d\u60f3\u82b1\u8d39\u6570\u5c0f\u65f6\u7f16\u5199\u811a\u672c\u6216\u624b\u52a8\u63d2\u5165\u8bb0\u5f55\u7684\u60c5\u51b5\uff1f\u6216\u8005\u60a8\u53ef\u80fd\u5bf9\u5982\u4f55\u5229\u7528 MySQL 8.0 \u4e2d\u7684\u65b0\u529f\u80fd\u6765\u7b80\u5316\u6570\u636e\u5e93\u4efb\u52a1\u611f\u5230\u597d\u5947\uff1f\u597d\u5427\uff0c\u4f60\u53ef\u8981\u597d\u597d\u4eab\u53d7\u4e00\u4e0b\u4e86\uff01\u5728\u8fd9\u7bc7\u6587\u7ae0\u4e2d\uff0c\u6211\u4eec\u5c06\u63a2\u7d22\u5982\u4f55\u4f7f\u7528\u901a\u7528\u8868\u8868\u8fbe\u5f0f (CTE) \u8f7b\u677e\u751f\u6210\u5927\u91cf\u865a\u62df\u6570\u636e\u5e76\u5c06\u5176\u63d2\u5165\u5230 MySQL \u6570\u636e\u5e93\u4e2d\u3002<\/p>\n

\u60f3\u8c61\u4e00\u4e0b\u9700\u8981\u5728\u8868\u4e2d\u586b\u5145\u4e00\u767e\u4e07\u4e2a\u54c8\u5e0c\u503c\u4ee5\u8fdb\u884c\u8d1f\u8f7d\u6d4b\u8bd5\u6216\u6027\u80fd\u57fa\u51c6\u6d4b\u8bd5\u3002\u542c\u8d77\u6765\u50cf\u4e00\u573a\u5669\u68a6\uff0c\u5bf9\u5427\uff1f\u4e0d\u518d\uff01\u968f\u7740 MySQL 8.0 \u4e2d CTE \u7684\u51fa\u73b0\uff0c\u60a8\u53ef\u4ee5\u5728\u51e0\u79d2\u949f\u5185\u5b9e\u73b0\u8fd9\u4e00\u76ee\u6807\u3002\u8ba9\u6211\u4eec\u6df1\u5165\u4e86\u89e3\u5b83\u7684\u5de5\u4f5c\u539f\u7406\u4ee5\u53ca\u5982\u4f55\u4f7f\u7528\u8fd9\u4e2a\u5f3a\u5927\u7684\u529f\u80fd\u6765\u7b80\u5316\u60a8\u7684\u6570\u636e\u751f\u6210\u9700\u6c42\u3002<\/p>\n

TL; DR <\/h2>\n

\u516c\u7528\u8868\u8868\u8fbe\u5f0f\uff08CTE\uff09\u662fMySQL 8.0\u4e2d\u6dfb\u52a0\u7684\u65b0\u529f\u80fd\uff0c\u53ef\u4ee5\u7528\u6765\u8f7b\u677e\u8f93\u5165\u5927\u91cf\u7b80\u5355\u7684\u865a\u62df\u6570\u636e\u3002\u4f8b\u5982\uff0c\u5982\u679c\u60a8\u60f3\u5c06 100 \u4e07\u6761\u865a\u62df\u6570\u636e\u8f93\u5165\u5230\u4e00\u4e2a\u5b58\u50a8\u54c8\u5e0c\u503c\u7684\u540d\u4e3a hashes \u7684\u8868\u4e2d\uff0c\u60a8\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u6b65\u9aa4\u5b9e\u73b0\uff1a<\/p>\n

\u8868\u5b9a\u4e49 <\/h2>\n

\u9996\u5148\uff0c\u521b\u5efa\u8868\uff1a<\/p>\n

\u521b\u5efa\u8868\u54c8\u5e0c\uff08\n  id INT \u4e3b\u952e\u81ea\u52a8\u9012\u589e\uff0c\n  \u54c8\u5e0c CHAR(64)\n\uff09\uff1b\n<\/pre>\n
 \u67e5\u8be2\u6267\u884c <\/h2>\n
\u8bbe\u7f6e\u4f1a\u8bdd\u53d8\u91cf\u4ee5\u5141\u8bb8\u66f4\u9ad8\u7684\u9012\u5f52\u6df1\u5ea6\uff1a<\/p>\n
\u8bbe\u7f6e\u4f1a\u8bddcte_max_recursion_\u6df1\u5ea6= 1000000\uff1b\n<\/pre>\n
\u7136\u540e\uff0c\u6267\u884cCTE\u63d2\u5165100\u4e07\u884c\uff1a<\/p>\n
\u63d2\u5165\u54c8\u5e0c\u503c\uff08hash\uff09\n\u5e26\u6709\u9012\u5f52 cte (n) AS\n\uff08\n  \u9009\u62e91\n  \u8054\u5408\u6240\u6709\n  \u4ece cte \u4e2d\u9009\u62e9 n + 1\uff0c\u5176\u4e2d n \n\n\n\n
\u6b64\u65b9\u6cd5\u5229\u7528\u9012\u5f52\u516c\u7528\u8868\u8868\u8fbe\u5f0f\u6765\u751f\u6210\u865a\u62df\u6570\u636e\u3002<\/p>\n\n
\n  \n  \n  \u4e86\u89e3 CTE\n<\/h2>\n\n
\u516c\u5171\u8868\u8868\u8fbe\u5f0f\uff08CTE\uff09\u662f\u4e00\u4e2a\u547d\u540d\u7684\u4e34\u65f6\u7ed3\u679c\u96c6\uff0c\u53ef\u4ee5\u5728\u5355\u4e2a\u8bed\u53e5\u4e2d\u591a\u6b21\u5f15\u7528\u3002 CTE \u5bf9\u4e8e\u7b80\u5316\u590d\u6742\u67e5\u8be2\u548c\u63d0\u9ad8\u53ef\u8bfb\u6027\u7279\u522b\u6709\u7528\u3002<\/p>\n\n
\n  \n  \n  \u8bed\u6cd5\u7ec6\u76ee\n<\/h3>\n\n
\n  \n  \n  \u8bbe\u7f6e\u9012\u5f52\u6df1\u5ea6\n<\/h4>\n\n\n\n
\u8bbe\u7f6e\u4f1a\u8bddcte_max_recursion_\u6df1\u5ea6= 1000000\uff1b\n<\/pre>\n
cte_max_recursion_depth\u7cfb\u7edf\u53d8\u91cf\u8bbe\u7f6e\u9012\u5f52\u7684\u4e0a\u9650\u3002\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u5b83\u662f1000\uff0c\u6240\u4ee5\u8981\u9012\u5f52\u66f4\u591a\uff0c\u4f60\u9700\u8981\u8c03\u6574\u5b83\u3002\u5728\u8fd9\u91cc\uff0c\u6211\u4eec\u5c06\u5176\u8bbe\u7f6e\u4e3a 100 \u4e07\u3002<\/p>\n
\n
  CTE \u67e5\u8be2
\n<\/h4>\n
\u63d2\u5165\u54c8\u5e0c\u503c\uff08hash\uff09\n\u5e26\u6709\u9012\u5f52 cte (n) AS\n\uff08\n  \u9009\u62e91\n  \u8054\u5408\u6240\u6709\n  \u4ece cte \u4e2d\u9009\u62e9 n + 1\uff0c\u5176\u4e2d n \n\n\n\n
\u8ba9\u6211\u4eec\u5206\u89e3\u8fd9\u4e2a\u67e5\u8be2\uff1a<\/p>\n\n<\/pre>\n
    \n
  • \n
    \u4f7f\u7528\u9012\u5f52 cte (n)\uff1a\u8fd9\u5c06\u542f\u52a8 CTE \u5b9a\u4e49\u3002 cte\u662f\u4e34\u65f6\u7ed3\u679c\u96c6\u7684\u540d\u79f0\uff0cn\u662f\u5217\u3002<\/p>\n<\/li>\n
  • \n
    SELECT 1\uff1a\u8fd9\u662fCTE\u7684\u975e\u9012\u5f52\u90e8\u5206\uff0c\u4f5c\u4e3a\u8d77\u70b9\uff08\u521d\u59cb\u503c\uff09\u3002<\/p>\n<\/li>\n
  • \n
    UNION ALL SELECT n + 1 FROM cte WHERE n <\/p>\n<\/li>\n
  • \n
    SELECT SHA2(n, 256) FROM cte\uff1a\u67e5\u8be2\u7684\u6700\u540e\u90e8\u5206\u9009\u62e9\u6bcf\u4e2a n \u503c\u7684 SHA-256 \u54c8\u5e0c\uff0c\u751f\u6210\u7528\u4e8e\u63d2\u5165\u7684\u865a\u62df\u6570\u636e\u3002<\/p>\n<\/li>\n<\/ul>\n
     \u600e\u4e48\u8fd0\u884c\u7684 <\/h3>\n
    CTE \u9012\u5f52\u751f\u6210\u4ece 1 \u5230 1,000,000 \u7684\u6570\u5b57\u3002\u5bf9\u4e8e\u6bcf\u4e2a\u6570\u5b57\uff0c\u5b83\u8ba1\u7b97 SHA-256 \u54c8\u5e0c\u503c\u5e76\u5c06\u5176\u63d2\u5165\u54c8\u5e0c\u8868\u4e2d\u3002\u8fd9\u79cd\u65b9\u6cd5\u975e\u5e38\u9ad8\u6548\uff0c\u5e76\u4e14\u5229\u7528 MySQL \u7684\u9012\u5f52\u529f\u80fd\u6765\u65e0\u7f1d\u5904\u7406\u5927\u6570\u636e\u91cf\u3002<\/p>\n
     \u5904\u7406\u901f\u5ea6 <\/h2>\n
     \u9a8c\u8bc1\u73af\u5883 <\/h3>\n
    \u4e3a\u4e86\u4e86\u89e3\u6b64\u529f\u80fd\u7684\u5f71\u54cd\uff0c\u6211\u4f7f\u7528\u4e86 Gitpod Enterprise \u5de5\u4f5c\u533a\uff0c\u5229\u7528\u5f3a\u5927\u4e14\u77ed\u6682\u7684\u73af\u5883\u6765\u907f\u514d\u8bbe\u7f6e\u548c\u5b89\u88c5\u7684\u9ebb\u70e6\u3002\u8fd9\u662f\u8bbe\u7f6e\u7684\u6982\u89c8\uff1a<\/p>\n
      \n
    •  \u673a\u5668<\/strong>\uff1aGitpod Enterprise XXLarge \u5de5\u4f5c\u533a <\/li>\n
    •  \u64cd\u4f5c\u7cfb\u7edf<\/strong>\uff1aUbuntu 22.04.4 LTS\uff08Jammy Jellyfish\uff09<\/li>\n
    •  \u5bb9\u5668\u5316<\/strong>\uff1aDocker \u7248\u672c 26.0.1<\/li>\n
    •  MySQL \u7248\u672c<\/strong>\uff1a\u5b98\u65b9 MySQL 8.0 Docker \u955c\u50cf<\/li>\n<\/ul>\n
       \u7ed3\u679c <\/h3>\n
      \u5bf9\u4e8e 100 \u4e07\u884c\uff0c\u67e5\u8be2\u6267\u884c\u65f6\u95f4\u7ea6\u4e3a 4.46 \u79d2\uff1a<\/p>\n
      mysql> INSERT INTO \u54c8\u5e0c\u503c(hash)\n    -> \u5e26\u6709\u9012\u5f52 cte (n) AS\n    -> (\n    -> \u9009\u62e9 1\n    -> \u8054\u5408\u6240\u6709\n    -> \u4ece cte \u4e2d\u9009\u62e9 n + 1\uff0c\u5176\u4e2d n  )\n    -> \u4ece cte \u4e2d\u9009\u62e9 SHA2(n, 256)\uff1b\n\u67e5\u8be2\u6b63\u5e38\uff0c1000000 \u884c\u53d7\u5f71\u54cd\uff084.43 \u79d2\uff09\n\u8bb0\u5f55\uff1a1000000 \u91cd\u590d\uff1a0 \u8b66\u544a\uff1a0\n<\/pre>\n
       \u6027\u80fd\u6307\u6807 <\/h3>\n\n\n\n\n\n\n\n\n\n
      \u884c\u6570<\/th>\n\u6267\u884c\u65f6\u95f4<\/th>\n<\/tr>\n<\/thead>\n
      1,000<\/td>\n0.03\u79d2<\/td>\n<\/tr>\n
      10,000<\/td>\n0.07\u79d2<\/td>\n<\/tr>\n
      100,000<\/td>\n0.42\u79d2<\/td>\n<\/tr>\n
      1,000,000<\/td>\n4.43\u79d2<\/td>\n<\/tr>\n
      10,000,000<\/td>\n48.53\u79d2<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
       \u7ed3\u8bba <\/h2>\n
      \u5728 MySQL 8.0 \u4e2d\u4f7f\u7528 CTE \u6539\u53d8\u4e86\u6e38\u620f\u89c4\u5219\uff0c\u53ef\u4ee5\u5feb\u901f\u751f\u6210\u5927\u91cf\u865a\u62df\u6570\u636e\u3002\u5b83\u5bf9\u4e8e\u8d1f\u8f7d\u6d4b\u8bd5\u548c\u6027\u80fd\u57fa\u51c6\u6d4b\u8bd5\u7279\u522b\u65b9\u4fbf\u3002\u53ea\u9700\u51e0\u884c\u4ee3\u7801\uff0c\u60a8\u5c31\u53ef\u4ee5\u8f7b\u677e\u586b\u5145\u8868\u683c\uff0c\u7136\u540e\u8fd4\u56de\u9879\u76ee\u7684\u5176\u4ed6\u91cd\u8981\u90e8\u5206\u3002<\/p>\n
      \u4e0d\u8981\u72b9\u8c6b\uff0c\u5c1d\u8bd5\u4e0d\u540c\u7684\u6570\u636e\u751f\u6210\u7b56\u7565\u548c\u9012\u5f52\u6df1\u5ea6\uff0c\u770b\u770b\u54ea\u79cd\u6700\u9002\u5408\u60a8\u3002\u6709\u5173\u5b89\u5168\u6027\u548c\u65e5\u5fd7\u5206\u6790\u7684\u66f4\u591a\u63d0\u793a\u548c\u89c1\u89e3\uff0c\u8bf7\u5728 Twitter \u4e0a\u5173\u6ce8\u6211@Siddhant_K_code\uff0c\u5e76\u968f\u65f6\u4e86\u89e3\u6b64\u7c7b\u6700\u65b0\u4e14\u8be6\u7ec6\u7684\u6280\u672f\u5185\u5bb9\u3002\u5feb\u4e50\u7f16\u7801\uff01<\/p>\n
      \u4eca\u5929\u5173\u4e8e\u300a\u5982\u4f55\u5728MySQL\u4e2d\u5927\u89c4\u6a21\u6ce8\u5165\u7b80\u5355\u7684\u865a\u62df\u6570\u636e\u300b\u7684\u5185\u5bb9\u5c31\u4ecb\u7ecd\u5230\u8fd9\u91cc\u4e86\uff0c\u662f\u4e0d\u662f\u5b66\u8d77\u6765\u4e00\u76ee\u4e86\u7136\uff01\u60f3\u8981\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u7684\u5185\u5bb9\u8bf7\u5173\u6ce8\u4e3b\u673a\u5b9d\u8d1d\u516c\u4f17\u53f7\uff01<\/p>\n
       \u7248\u672c\u58f0\u660e \u672c\u6587\u8f6c\u8f7d\u4e8e\uff1adev.to \u5982\u6709\u4fb5\u72af\uff0c\u8bf7\u8054\u7cfb \u5220\u9664 <\/p>\n
      \n
      \n <\/dt>\n<\/dl>\n","protected":false},"excerpt":{"rendered":"
      \u5982\u4f55\u5728MySQL\u4e2d\u5927\u89c4\u6a21\u6ce8\u5165\u7b80\u5355...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-200109","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200109","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=200109"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/200109\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=200109"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=200109"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=200109"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}