{"id":7044,"date":"2024-11-14T08:33:22","date_gmt":"2024-11-14T00:33:22","guid":{"rendered":"https:\/\/fwq.ai\/blog\/7044\/"},"modified":"2024-11-14T08:33:22","modified_gmt":"2024-11-14T00:33:22","slug":"mysql-block-nested-loop-join-%e7%ae%97%e6%b3%95%e5%a6%82%e4%bd%95%e4%bc%98%e5%8c%96-nested-loop-join%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/7044\/","title":{"rendered":"MySQL Block Nested-Loop Join \u7b97\u6cd5\u5982\u4f55\u4f18\u5316 Nested-Loop Join\uff1f"},"content":{"rendered":"

\"MySQL<\/p>\n

MySQL Block Nested-Loop Join \u7b97\u6cd5\u7684\u4f18\u5316<\/strong><\/p>\n

Block Nested-Loop Join (BNL) \u7b97\u6cd5\u662f Nested-Loop Join (NLJ) \u7b97\u6cd5\u7684\u4f18\u5316\u7248\u672c\uff0c\u5b83\u51cf\u5c11\u4e86\u5185\u5c42\u8868\u7684\u626b\u63cf\u6b21\u6570\uff0c\u63d0\u9ad8\u4e86\u67e5\u8be2\u6548\u7387\u3002<\/p>\n

BNL \u7b97\u6cd5\u539f\u7406<\/strong><\/p>\n

BNL \u7b97\u6cd5\u5c06\u5916\u5c42\u5faa\u73af\u7684\u7ed3\u679c\u96c6\u7684\u4e00\u90e8\u5206\uff08\u4f8b\u5982 100 \u884c\uff09\u5b58\u50a8\u5728 Join Buffer \u4e2d\u3002\u7136\u540e\uff0c\u5b83\u5c06\u5185\u5c42\u8868\u7684\u6bcf\u4e00\u884c\u4e0e Join Buffer \u4e2d\u5b58\u50a8\u7684\u8fd9 100 \u884c\u8fdb\u884c\u6bd4\u8f83\u3002<\/p>\n

\u6279\u91cf\u6bd4\u8f83\u7684\u542b\u4e49<\/strong><\/p>\n

\u201c\u53ef\u4ee5\u4e00\u6b21\u6027\u4e0e 100 \u884c\u6570\u636e\u8fdb\u884c\u6bd4\u8f83\u201d\u610f\u5473\u7740\u5185\u5c42\u8868\u7684\u4e00\u884c\u4e0d\u662f\u4e0e Join Buffer \u4e2d\u7684\u6bcf\u884c\u4e00\u4e00\u6bd4\u8f83\uff0c\u800c\u662f\u5728 Join Buffer \u4e0a\u8fdb\u884c\u4e00\u6b21\u6279\u91cf\u6bd4\u8f83\u3002<\/p>\n

Join Buffer \u7684\u4f5c\u7528<\/strong><\/p>\n

Join Buffer \u4f1a\u7f13\u5b58\u6240\u6709\u53c2\u4e0e\u67e5\u8be2\u7684\u5217\uff0c\u800c\u4e0d\u4ec5\u4ec5\u662f\u7528\u4e8e\u8fde\u63a5\u7684\u5217\u3002\u8fd9\u63d0\u9ad8\u4e86\u6279\u91cf\u6bd4\u8f83\u7684\u6548\u7387\uff0c\u56e0\u4e3a\u5185\u5c42\u8868\u7684\u4e00\u884c\u53ea\u9700\u8981\u6bd4\u8f83\u4e00\u6b21 Join Buffer \u4e2d\u7684\u6240\u6709\u884c\u3002<\/p>\n

\u901a\u8fc7\u4f7f\u7528 Join Buffer\uff0cBNL \u7b97\u6cd5\u53ef\u4ee5\u5c06\u5185\u5c42\u8868\u7684\u626b\u63cf\u6b21\u6570\u964d\u81f3\u6700\u5c0f\uff0c\u751a\u81f3\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u5c06\u5176\u9650\u5236\u4e3a\u4e00\u6b21\u626b\u63cf\uff0c\u4e0e NLJ \u7b97\u6cd5\u76f8\u6bd4\uff0c\u5b83\u663e\u8457\u63d0\u9ad8\u4e86\u67e5\u8be2\u6027\u80fd\u3002<\/p>\n

\u4ee5\u4e0a\u5c31\u662fMySQL Block Nested-Loop Join \u7b97\u6cd5\u5982\u4f55\u4f18\u5316 Nested-Loop Join\uff1f\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u7f51\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"

MySQL Block Nested-Loop Join \u7b97\u6cd5\u7684\u4f18\u5316 Block Nested-Loop Join (BNL) \u7b97\u6cd5\u662f Nested-Loop Join (NLJ) \u7b97\u6cd5\u7684\u4f18\u5316\u7248\u672c\uff0c\u5b83\u51cf\u5c11\u4e86\u5185\u5c42\u8868\u7684\u626b\u63cf\u6b21\u6570\uff0c\u63d0\u9ad8\u4e86\u67e5\u8be2\u6548\u7387\u3002 BNL \u7b97\u6cd5\u539f\u7406 BNL \u7b97\u6cd5\u5c06\u5916\u5c42\u5faa\u73af\u7684\u7ed3\u679c\u96c6\u7684\u4e00\u90e8\u5206\uff08\u4f8b\u5982 100 \u884c\uff09\u5b58\u50a8\u5728 Join Buffer \u4e2d\u3002\u7136\u540e\uff0c\u5b83\u5c06\u5185\u5c42\u8868\u7684\u6bcf\u4e00\u884c\u4e0e Join Buffer \u4e2d\u5b58\u50a8\u7684\u8fd9 100 \u884c\u8fdb\u884c\u6bd4\u8f83\u3002 \u6279\u91cf\u6bd4\u8f83\u7684\u542b\u4e49 \u201c\u53ef\u4ee5\u4e00\u6b21\u6027\u4e0e 100 \u884c\u6570\u636e\u8fdb\u884c\u6bd4\u8f83\u201d\u610f\u5473\u7740\u5185\u5c42\u8868\u7684\u4e00\u884c\u4e0d\u662f\u4e0e Join Buffer \u4e2d\u7684\u6bcf\u884c\u4e00\u4e00\u6bd4\u8f83\uff0c\u800c\u662f\u5728 Join Buffer \u4e0a\u8fdb\u884c\u4e00\u6b21\u6279\u91cf\u6bd4\u8f83\u3002 Join Buffer \u7684\u4f5c\u7528 Join Buffer \u4f1a\u7f13\u5b58\u6240\u6709\u53c2\u4e0e\u67e5\u8be2\u7684\u5217\uff0c\u800c\u4e0d\u4ec5\u4ec5\u662f\u7528\u4e8e\u8fde\u63a5\u7684\u5217\u3002\u8fd9\u63d0\u9ad8\u4e86\u6279\u91cf\u6bd4\u8f83\u7684\u6548\u7387\uff0c\u56e0\u4e3a\u5185\u5c42\u8868\u7684\u4e00\u884c\u53ea\u9700\u8981\u6bd4\u8f83\u4e00\u6b21 Join Buffer \u4e2d\u7684\u6240\u6709\u884c\u3002 \u901a\u8fc7\u4f7f\u7528 Join Buffer\uff0cBNL \u7b97\u6cd5\u53ef\u4ee5\u5c06\u5185\u5c42\u8868\u7684\u626b\u63cf\u6b21\u6570\u964d\u81f3\u6700\u5c0f\uff0c\u751a\u81f3\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u5c06\u5176\u9650\u5236\u4e3a\u4e00\u6b21\u626b\u63cf\uff0c\u4e0e NLJ \u7b97\u6cd5\u76f8\u6bd4\uff0c\u5b83\u663e\u8457\u63d0\u9ad8\u4e86\u67e5\u8be2\u6027\u80fd\u3002 \u4ee5\u4e0a\u5c31\u662fMySQL Block […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[16],"tags":[],"class_list":["post-7044","post","type-post","status-publish","format-standard","hentry","category-16"],"_links":{"self":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/7044","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/comments?post=7044"}],"version-history":[{"count":0,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/posts\/7044\/revisions"}],"wp:attachment":[{"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/media?parent=7044"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/categories?post=7044"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/fwq.ai\/blog\/wp-json\/wp\/v2\/tags?post=7044"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}