{"id":10008270,"date":"2023-09-12T09:41:04","date_gmt":"2023-09-12T01:41:04","guid":{"rendered":"https:\/\/blog.itmax.cn\/?p=10008270"},"modified":"2023-09-12T09:41:04","modified_gmt":"2023-09-12T01:41:04","slug":"%e9%ab%98%e6%80%a7%e8%83%bdmysql%e5%ae%9e%e6%88%98%ef%bc%88%e4%ba%8c%ef%bc%89%ef%bc%9a%e7%b4%a2%e5%bc%95-%e4%ba%ac%e4%b8%9c%e7%89%a9%e6%b5%81%e6%8a%80%e6%9c%af%e5%9b%a2%e9%98%9f","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10008270","title":{"rendered":"\u9ad8\u6027\u80fdMySQL\u5b9e\u6218\uff08\u4e8c\uff09\uff1a\u7d22\u5f15 | \u4eac\u4e1c\u7269\u6d41\u6280\u672f\u56e2\u961f"},"content":{"rendered":"

\u6211\u4eec\u5728\u4e0a\u7bc7 \u9ad8\u6027\u80fdMySQL\u5b9e\u6218\uff08\u4e00\uff09<\/a>\uff1a\u8868\u7ed3\u6784 \u4e2d\u5df2\u7ecf\u5efa\u7acb\u597d\u4e86\u8868\u7ed3\u6784\uff0c\u8fd9\u7bc7\u6211\u4eec\u5219\u662f\u9488\u5bf9\u5df2\u6709\u7684\u8868\u7ed3\u6784\u548c\u641c\u7d22\u6761\u4ef6\u4e3a\u8868\u521b\u5efa\u7d22\u5f15\u3002<\/p>\n

1. \u6839\u636e\u641c\u7d22\u6761\u4ef6\u521b\u5efa\u7d22\u5f15<\/h2>\n

\u6211\u4eec\u8fd8\u662f\u5148\u5c06\u8868\u7ed3\u6784\u7684\u521d\u59cb\u5316 SQL \u62ff\u8fc7\u6765\uff1a<\/p>\n

CREATE TABLE `service_log` (\n  `id` bigint UNSIGNED NOT NULL AUTO_INCREMENT COMMENT '\u4e3b\u952e',\n  `service_type` smallint NOT NULL DEFAULT -1 COMMENT '\u63a5\u53e3\u7c7b\u578b',\n  `service_name` varchar(30) DEFAULT '' COMMENT '\u63a5\u53e3\u540d\u79f0',\n  `service_method` tinyint NOT NULL DEFAULT -1 COMMENT '\u63a5\u53e3\u65b9\u5f0f 1-HTTP 2-TCP',\n  `serial_no` int DEFAULT -1 COMMENT '\u6d88\u606f\u5e8f\u53f7',\n  `service_caller` tinyint DEFAULT -1 COMMENT '\u8c03\u7528\u65b9',\n  `service_receiver` tinyint DEFAULT -1 COMMENT '\u63a5\u6536\u65b9',\n  `status` tinyint DEFAULT 10 COMMENT '\u72b6\u6001 10-\u6210\u529f 20-\u5f02\u5e38',\n  `error_message` varchar(200) DEFAULT '' COMMENT '\u5f02\u5e38\u4fe1\u606f',\n  `message` varchinar(1000) DEFAULT '' COMMENT '\u62a5\u6587\u5185\u5bb9',\n  `create_user` varchar(50) DEFAULT '' COMMENT '\u521b\u5efa\u8005',\n  `create_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '\u521b\u5efa\u65f6\u95f4',\n  `update_user` varchar(50) DEFAULT '' COMMENT '\u66f4\u65b0\u8005',\n  `update_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '\u66f4\u65b0\u65f6\u95f4',\n  `is_delete` tinyint NOT NULL DEFAULT 0 COMMENT '\u522a\u9664\u6807\u5fd7',\n  `ts` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '\u65f6\u95f4\u6233',\n  PRIMARY KEY (`id`)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='\u63a5\u53e3\u8c03\u7528\u65e5\u5fd7';\n<\/code><\/pre>\n
\u73b0\u6709\u5982\u4e0b\u641c\u7d22\u6761\u4ef6\uff1a<\/p>\n
    \n
  1. \u6839\u636e \u63a5\u53e3\u540d\u79f0<\/strong> \u6765\u641c\u7d22\u5bf9\u5e94\u7684\u8c03\u7528\u65e5\u5fd7<\/li>\n
  2. \u6839\u636e \u72b6\u6001<\/strong> \u67e5\u8be2\u6210\u529f\u6216\u5f02\u5e38\u7684\u8c03\u7528\u65e5\u5fd7<\/li>\n
  3. \u6839\u636e \u63a5\u53e3\u540d\u79f0<\/strong> \u548c \u72b6\u6001<\/strong> \u67e5\u8be2\u8c03\u7528\u65e5\u5fd7<\/li>\n
  4. \u6839\u636e \u6d88\u606f\u5e8f\u53f7<\/strong> \u6765\u83b7\u53d6\u4e00\u7ec4\u8c03\u7528\u65e5\u5fd7<\/li>\n
  5. \u6839\u636e \u521b\u5efa\u65f6\u95f4<\/strong> \u7684\u65f6\u95f4\u8303\u56f4\u67e5\u8be2\u8c03\u7528\u65e5\u5fd7<\/li>\n
  6. \u6839\u636e \u62a5\u6587\u5185\u5bb9<\/strong> \u67e5\u8be2\u8c03\u7528\u65e5\u5fd7<\/li>\n<\/ol>\n
    \u7d22\u5f15\u662f\u63d0\u5347\u67e5\u8be2\u6027\u80fd\u6700\u6709\u6548\u7684\u624b\u6bb5<\/strong>\uff0c\u5b83\u53ef\u4ee5\u5feb\u901f\u5b9a\u4f4d\u5230\u8bb0\u5f55\uff0c\u5927\u5927\u51cf\u5c11\u9700\u8981\u626b\u63cf\u7684\u6570\u636e\u91cf\uff0c\u5c06\u968f\u673a I\/O \u53d8\u4e3a\u987a\u5e8f I\/O\uff0c\u800c\u4e14 B+ Tree \u7d22\u5f15\u4f1a\u6839\u636e\u7d22\u5f15\u503c\u987a\u5e8f\u5b58\u50a8\uff0c\u6240\u4ee5\u4e5f\u80fd\u591f\u5e94\u7528\u4e8e \u6392\u5e8f\u548c\u5206\u7ec4<\/strong>\u3002<\/p>\n
    \u4e3a\u4e86\u5728\u67e5\u770b\u8fd9\u4e9b\u63a5\u53e3\u8c03\u7528\u65e5\u5fd7\u65f6\u6709\u66f4\u597d\u7684\u4f53\u9a8c\uff0c\u90a3\u4e48\u6211\u4eec\u5c31\u9700\u8981\u6839\u636e\u641c\u7d22\u6761\u4ef6\u6765\u521b\u5efa\u7d22\u5f15\u3002<\/p>\n
    \u7d22\u5f15\u7684\u7c7b\u578b\u5c3d\u91cf\u5c0f<\/h4>\n
    \u6211\u4eec\u5148\u5173\u6ce8\u4e0b\u63a5\u53e3\u540d\u79f0\u7684\u641c\u7d22\u6761\u4ef6\uff0c\u6211\u4eec\u53ef\u4ee5\u53d1\u73b0\uff1a\u63a5\u53e3\u540d\u79f0\u548c\u63a5\u53e3\u7c7b\u578b\u8fd9\u4e24\u4e2a\u5b57\u6bb5\u90fd\u80fd\u67e5\u8be2\u5230\u76f8\u540c\u7c7b\u578b\u63a5\u53e3\u7684\u65e5\u5fd7\u6570\u636e\uff0c\u53ea\u4e0d\u8fc7\u5b83\u4eec\u7684\u7c7b\u578b\u4e0d\u540c\uff0c\u524d\u8005\u662f\u5b57\u7b26\u4e32\u7c7b\u578b\uff0c\u540e\u8005\u662f\u6574\u578b\u3002<\/p>\n
    \u8fd9\u65f6\u6211\u4eec\u9700\u8981\u6ce8\u610f\uff1a\u9009\u62e9\u521b\u5efa\u7d22\u5f15\u7684\u5217\u7684\u7c7b\u578b\u8981\u5c3d\u91cf\u5c0f<\/strong>\u3002\u56e0\u4e3a\u6bcf\u521b\u5efa\u4e00\u4e2a\u7d22\u5f15\u5c31\u76f8\u5f53\u4e8e\u521b\u5efa\u4e86\u201c\u4e00\u68f5 B \u6811\u201d\uff0c\u6570\u636e\u7c7b\u578b\u8d8a\u5c0f\uff0c\u90a3\u4e48\u7d22\u5f15\u5360\u7528\u7684\u5b58\u50a8\u7a7a\u95f4\u5c31\u8d8a\u5c11\uff0c\u5728\u4e00\u4e2a\u6570\u636e\u9875\u5185\u5c31\u80fd\u5b58\u653e\u66f4\u591a\u7684\u8bb0\u5f55\uff0c\u56e0\u6b64\u78c1\u76d8 I\/O \u5e26\u6765\u7684\u6027\u80fd\u635f\u8017\u4e5f\u5c31\u8d8a\u5c11<\/strong>\u3002<\/p>\n
    \u9664\u6b64\u4e4b\u5916\uff0c\u5728 MySQL \u5185\u90e8\u6574\u578b\u6570\u636e\u7684\u6bd4\u8f83\u76f8\u6bd4\u4e8e\u5b57\u7b26\u4e32\u7c7b\u578b\u7684\u6bd4\u8f83\u66f4\u7b80\u5355\uff0c\u6548\u7387\u4e5f\u66f4\u9ad8\u3002\u6240\u4ee5\uff0c\u6211\u4eec\u4f1a\u9009\u62e9\u4e3a\u63a5\u53e3\u7c7b\u578b\u521b\u5efa\u7d22\u5f15\u800c\u4e0d\u662f\u4e3a\u63a5\u53e3\u540d\u79f0\u521b\u5efa\u7d22\u5f15\u3002<\/p>\n
    \u4e3a \u63a5\u53e3\u7c7b\u578b<\/strong> \u5217\u6dfb\u52a0\u7d22\u5f15\u7684 SQL \u5982\u4e0b\uff1a<\/p>\n
    alter table service_log add index index_service_type(`service_type`);\n<\/code><\/pre>\n
    \u6839\u636e\u6761\u4ef6 4\uff0c\u6d88\u606f\u5e8f\u53f7\u5217\u4e5f\u9700\u8981\u6dfb\u52a0\u7d22\u5f15\uff1a<\/p>\n
    alter table service_log add index index_serial_no(`serial_no`);\n<\/code><\/pre>\n
    \u5197\u4f59\u548c\u91cd\u590d\u7d22\u5f15<\/h4>\n
    \u540c\u6837\u5730\uff0c\u6839\u636e\u641c\u7d22\u6761\u4ef6 2\uff0c\u6211\u4eec\u4e3a\u72b6\u6001\u5217\u6dfb\u52a0\u4e0a\u7d22\u5f15\uff1a<\/p>\n
    alter table service_log add index index_status(`status`);\n<\/code><\/pre>\n
    \u8fd9\u65f6\uff0c\u6211\u4eec\u518d\u770b\u770b\u6761\u4ef6 3\uff0c\u9700\u8981\u4e3a\u63a5\u53e3\u7c7b\u578b\u548c\u72b6\u6001\u6dfb\u52a0 \u8054\u5408\u7d22\u5f15<\/strong>\u3002\u4e0d\u8fc7\u9700\u8981\u6ce8\u610f\u7684\u662f\uff1a\u8be5\u8054\u5408\u7d22\u5f15\u548c\u5df2\u7ecf\u6dfb\u52a0\u7684\u63a5\u53e3\u7c7b\u578b\u7d22\u5f15\u662f\u91cd\u590d\u7d22\u5f15\uff0c\u6839\u636e\u8054\u5408\u7d22\u5f15\u7684 \u6700\u5de6\u5339\u914d\u539f\u5219<\/strong>\uff0c\u7b2c\u4e00\u5217\u4e3a\u63a5\u53e3\u7c7b\u578b\u7684\u8054\u5408\u7d22\u5f15\u540c\u6837\u80fd\u4e3a\u67e5\u8be2\u6761\u4ef6\u53ea\u6709\u63a5\u53e3\u7c7b\u578b\u7684\u67e5\u8be2\u670d\u52a1\uff0c\u6240\u4ee5\u6211\u4eec\u9700\u8981\u5c06\u539f\u6709\u4e3a\u63a5\u53e3\u7c7b\u578b\u6dfb\u52a0\u7684\u7d22\u5f15\u5220\u6389\uff0c\u518d\u521b\u5efa\u65b0\u7684\u63a5\u53e3\u7c7b\u578b\u548c\u72b6\u6001\u7684\u8054\u5408\u7d22\u5f15\u3002<\/p>\n
    -- \u5220\u9664 index_service_type\nalter table service_log drop index index_service_type;\n\n-- \u6dfb\u52a0\u8054\u5408\u7d22\u5f15\nalter table service_log add index index_service_type_status(`service_type`, `status`);\n<\/code><\/pre>\n
    \u521b\u5efa\u8054\u5408\u7d22\u5f15\u65f6\u6709\u4e00\u4e2a\u91cd\u8981\u7684\u7ecf\u9a8c\u6027\u6cd5\u5219\uff1a\u5c06\u5217\u503c\u91cd\u590d\u7387\u6700\u4f4e\u7684\u653e\u5230\u7d22\u5f15\u7684\u6700\u524d\u5217\u3002\u5982\u679c\u91cd\u590d\u7684\u503c\u8fc7\u591a\uff0c\u90a3\u4e48\u626b\u63cf\u5230\u7684\u6570\u636e\u884c\u6570\u4e5f\u5c31\u8d8a\u591a\uff0c\u8fd9\u6837\u5c31\u4f1a\u4f7f\u5f97\u56de\u8868\u7684\u538b\u529b\u5f88\u5927\u3002<\/p><\/blockquote>\n
    \u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u628a WHERE \u6761\u4ef6\u91cc\u9762\u7684\u5217\u90fd\u72ec\u7acb\u5730\u521b\u5efa\u591a\u4e2a\u5355\u5217\u7d22\u5f15\uff0c\u5728\u5927\u90e8\u5206\u60c5\u51b5\u4e0b\u5e76\u4e0d\u80fd\u63d0\u9ad8MySQL\u7684\u67e5\u8be2\u6027\u80fd<\/strong>\u3002\u6211\u4eec\u5e94\u8be5\u5c3d\u53ef\u80fd\u7684\u53bb\u8003\u8651 \u7d22\u5f15\u5217\u7684\u987a\u5e8f<\/strong> \u6216\u8005\u521b\u5efa\u4e00\u4e2a \u5168\u8986\u76d6\u7d22\u5f15<\/strong>\u3002<\/p>\n
    \u4e3a\u91cd\u590d\u7387\u4f4e\u7684\u5217\u521b\u5efa\u7d22\u5f15<\/h4>\n
    \u5728\u6211\u4eec\u7684\u5b9e\u9645\u4e1a\u52a1\u4e2d\uff0c\u63a5\u53e3\u8c03\u7528\u7684\u72b6\u6001\u51e0\u4e4e\u6240\u6709\u90fd\u662f\u6210\u529f\uff0c\u5f88\u5c11\u4f1a\u51fa\u73b0\u5931\u8d25\u7684\u60c5\u51b5\uff0c\u6240\u4ee5\u8fd9\u65f6\u6211\u4eec\u4e3a\u72b6\u6001\u5217\u521b\u5efa\u7d22\u5f15\u5e76\u4e0d\u662f\u5f88\u5408\u9002\u3002\u56e0\u4e3a\u5982\u679c\u6211\u4eec\u67e5\u8be2\u6240\u6709\u72b6\u6001\u4e3a\u6210\u529f\u7684\u6570\u636e\uff0c\u90a3\u4e48\u5b83\u53ef\u80fd\u4f1a\u6267\u884c\u592a\u591a\u6b21\u7684\u56de\u8868\u64cd\u4f5c\uff0c\u5bfc\u81f4\u67e5\u8be2\u6548\u7387\u4e0b\u964d\uff0c\u53ef\u80fd\u8fd8\u4e0d\u5982\u6267\u884c\u5168\u8868\u626b\u63cf\u6765\u7684\u5feb\u3002\u4f46\u662f\u6211\u4eec\u518d\u8003\u8651\u53e6\u4e00\u79cd\u60c5\u51b5\uff0c\u6709\u65f6\u6211\u4eec\u4f1a\u6839\u636e\u72b6\u6001\u4e3a\u5931\u8d25\u7684\u8bb0\u5f55\u505a\u4e1a\u52a1\u5206\u6790\u6216\u6392\u67e5\u95ee\u9898\uff0c\u5931\u8d25\u7684\u6570\u636e\u662f\u6bd4\u8f83\u5c11\u7684\uff0c\u5982\u679c\u6211\u4eec\u901a\u8fc7\u7d22\u5f15\u67e5\u8be2\u5c31\u4f1a\u975e\u5e38\u9ad8\u6548\uff0c\u6240\u4ee5\u8be5\u5217\u7d22\u5f15\u8fd8\u6709\u5fc5\u8981\u4fdd\u7559\u3002<\/p>\n
    \u53ea\u4e0d\u8fc7\u6211\u4eec\u5728\u8fd9\u91cc\u9700\u8981\u505a\u4e00\u4e2a\u5904\u7406\uff1a\u5982\u679c\u72b6\u6001\u4e3a\u6210\u529f\u65f6\uff0c\u6211\u4eec\u4e3a\u751f\u6210\u7684 SQL \u8bed\u53e5\u6dfb\u52a0\u4e0a\u5ffd\u7565\u7d22\u5f15\u7684\u5173\u952e\u5b57 ignore index(index_name)<\/strong>\uff0c\u90a3\u4e48\u8fd9\u6837\u6211\u4eec\u5c31\u80fd\u8fbe\u5230\u5728\u67e5\u8be2\u6210\u529f\u72b6\u6001\u7684\u6570\u636e\u65f6\u5168\u8868\u626b\u63cf\uff0c\u800c\u5728\u67e5\u8be2\u5931\u8d25\u72b6\u6001\u7684\u6570\u636e\u65f6\u4f7f\u7528\u7d22\u5f15\u4e86\u3002<\/p>\n
    select * from service_log ignore index(index_status)\nwhere status = 10;\n<\/code><\/pre>\n
    \u5168\u503c\u5339\u914d\u548c\u6309\u503c\u8303\u56f4\u5339\u914d\u7684\u65f6\u95f4\u5217<\/h4>\n
    \u6761\u4ef6 5 \u6839\u636e\u521b\u5efa\u65f6\u95f4\u6765\u8fdb\u884c\u5168\u503c\u5339\u914d\u548c\u6309\u503c\u8303\u56f4\u5339\u914d<\/strong> \u975e\u5e38\u9002\u5408\u521b\u5efa\u7d22\u5f15\uff1a<\/p>\n
    alter table service_log add index index_create_time(`create_time`);\n<\/code><\/pre>\n
    \u5168\u6587\u7d22\u5f15<\/h4>\n
    FULLTEXT \u5168\u6587\u7d22\u5f15\u662f\u4e00\u79cd\u7279\u6b8a\u7c7b\u578b\u7684\u7d22\u5f15\uff0c\u5b83\u67e5\u627e\u7684\u662f\u6587\u672c\u4e2d\u7684\u5173\u952e\u8bcd\uff0c\u800c\u4e0d\u662f\u76f4\u63a5\u6bd4\u8f83\u7d22\u5f15\u4e2d\u7684\u503c\uff0c\u66f4\u7c7b\u4f3c\u4e8e\u641c\u7d22\u5f15\u64ce\u6240\u505a\u7684\u4e8b\u60c5\u3002\u5728\u67e5\u8be2\u65f6\u9002\u7528\u4e8e MATCH AGAINST \u64cd\u4f5c\uff0c\u800c\u4e0d\u662f\u666e\u901a\u7684 WHERE \u6761\u4ef6\u3002<\/p>\n
    \u5bf9\u4e8e\u6761\u4ef6 5\uff0c\u6211\u4eec\u9700\u8981\u5728\u63a5\u53e3\u8bf7\u6c42\u7684\u62a5\u6587\u4e2d\u6839\u636e\u5173\u952e\u5b57\uff0c\u6bd4\u5982\u8bf4\u5305\u88f9\u53f7\u6765\u67e5\u8be2\u7279\u5b9a\u7684\u6570\u636e\uff0c\u8fd9\u5c31\u4f7f\u5f97\u6211\u4eec\u9700\u8981\u4e3a\u62a5\u6587\u5185\u5bb9\u5217\u521b\u5efa\u5168\u6587\u7d22\u5f15\uff0cSQL \u5982\u4e0b\uff1a<\/p>\n
    alter table service_log add fulltext fulltext_message(`message`);\n\n-- \u6267\u884c\u67e5\u8be2\u65f6\u7684\u8bed\u53e5\nselect * from service_log where match(message) against('123456');\n<\/code><\/pre>\n
    \u5168\u6587\u7d22\u5f15\u5728\u65e5\u5e38\u4f7f\u7528\u7684\u5e76\u4e0d\u591a\uff0c\u5b83\u6709\u8bb8\u591a\u9700\u8981\u6ce8\u610f\u7684\u7ec6\u8282\uff0c\u5982\u505c\u7528\u8bcd\u3001\u8bcd\u5e72\u3001\u590d\u6570\u548c\u5e03\u5c14\u641c\u7d22\u7b49\uff0c\u5177\u4f53\u7684\u8be6\u60c5\u4fe1\u606f\u53ef\u4ee5\u67e5\u770b\u6587\u672b\u7684\u53c2\u8003\u6587\u732e\u3002<\/p>\n
    \u90a3\u4e48\uff0c\u6700\u7ec8\u521d\u59cb\u5316\u8868\u7ed3\u6784\u7684 DDL \u8bed\u53e5\u5982\u4e0b\uff1a<\/p>\n
    CREATE TABLE `service_log` (\n  `id` bigint UNSIGNED NOT NULL AUTO_INCREMENT COMMENT '\u4e3b\u952e',\n  `service_type` smallint NOT NULL DEFAULT -1 COMMENT '\u63a5\u53e3\u7c7b\u578b',\n  `service_name` varchar(30) DEFAULT '' COMMENT '\u63a5\u53e3\u540d\u79f0',\n  `service_method` tinyint NOT NULL DEFAULT -1 COMMENT '\u63a5\u53e3\u65b9\u5f0f 1-HTTP 2-TCP',\n  `serial_no` int DEFAULT -1 COMMENT '\u6d88\u606f\u5e8f\u53f7',\n  `service_caller` tinyint DEFAULT -1 COMMENT '\u8c03\u7528\u65b9',\n  `service_receiver` tinyint DEFAULT -1 COMMENT '\u63a5\u6536\u65b9',\n  `status` tinyint DEFAULT 10 COMMENT '\u72b6\u6001 10-\u6210\u529f 20-\u5f02\u5e38',\n  `error_message` varchar(200) DEFAULT '' COMMENT '\u5f02\u5e38\u4fe1\u606f',\n  `message` varchar(1000) DEFAULT '' COMMENT '\u62a5\u6587\u5185\u5bb9',\n  `create_user` varchar(50) DEFAULT '' COMMENT '\u521b\u5efa\u8005',\n  `create_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '\u521b\u5efa\u65f6\u95f4',\n  `update_user` varchar(50) DEFAULT '' COMMENT '\u66f4\u65b0\u8005',\n  `update_time` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '\u66f4\u65b0\u65f6\u95f4',\n  `is_delete` tinyint NOT NULL DEFAULT 0 COMMENT '\u522a\u9664\u6807\u5fd7',\n  `ts` datetime NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '\u65f6\u95f4\u6233',\n  PRIMARY KEY (`id`),\n  index index_serial_no(`serial_no`),\n  index index_status(`status`),\n  index index_create_time(`create_time`),\n  index index_service_type_status(`service_type`, `status`),\n  fulltext fulltext_message(`message`)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='\u63a5\u53e3\u8c03\u7528\u65e5\u5fd7';\n<\/code><\/pre>\n
    \u524d\u7f00\u7d22\u5f15<\/h4>\n
    \u4e00\u822c\u60c5\u51b5\u4e0b\uff0c\u5bf9\u4e8e VARCHAR\u3001BLOB \u548c TEXT \u7b49\u76f8\u5173\u7c7b\u578b\u7684\u5217\u521b\u5efa\u7d22\u5f15\u65f6\uff0c\u4e3a\u4e86\u63d0\u5347\u7d22\u5f15\u7684\u6027\u80fd\u548c\u8282\u7701\u7d22\u5f15\u7a7a\u95f4\uff0c\u4f1a\u53ea\u5bf9\u5b57\u6bb5\u7684\u524d\u4e00\u90e8\u5206\u5b57\u7b26\u8fdb\u884c\u7d22\u5f15\uff0c\u4e0d\u8fc7\u8fd9\u6837\u505a\u7684\u7f3a\u70b9\u662f\u4f7f\u5f97\u7d22\u5f15\u7684\u9009\u62e9\u6027\u964d\u4f4e\u3002<\/p>\n
    \u7d22\u5f15\u7684\u9009\u62e9\u6027\u662f\u6307\u4e0d\u91cd\u590d\u7684\u7d22\u5f15\u503c\u548c\u8bb0\u5f55\u603b\u6570\u7684\u6bd4\u503c\uff0c\u53ef\u4ee5\u7406\u89e3\u4e3a\u91cd\u590d\u7387\u8d8a\u4f4e\u9009\u62e9\u6027\u8d8a\u9ad8\uff0c\u552f\u4e00\u7d22\u5f15\u7684\u9009\u62e9\u6027\u4e3a 1\u3002<\/p><\/blockquote>\n
    \u5728\u6211\u4eec\u7684\u6570\u636e\u5e93\u8868\u793a\u4f8b\u4e2d\uff0c\u5e76\u6ca1\u6709\u5b57\u6bb5\u9002\u5408\u5efa\u7acb\u524d\u7f00\u7d22\u5f15\u3002\u5176\u4e2d\u62a5\u6587\u5185\u5bb9\u5217\u4e5f\u5e76\u4e0d\u9002\u5408\u521b\u5efa\u524d\u7f00\u7d22\u5f15\uff0c\u56e0\u4e3a\u8fd9\u4e9b\u62a5\u6587\u7684\u524d\u7f00\u90fd\u5f88\u76f8\u4f3c\uff0c\u800c\u4e14\u6211\u4eec\u5728\u6267\u884c\u67e5\u8be2\u65f6\u5e76\u4e0d\u4f1a\u5e26\u4e0a\u524d\u7f00\uff0c\u800c\u662f\u53ea\u4f7f\u7528\u5173\u952e\u8bcd\u4fe1\u606f\u67e5\u8be2\u3002<\/p>\n
    \u4f46\u662f\uff0c\u524d\u7f00\u7d22\u5f15\u6bd4\u8f83\u91cd\u8981\uff0c\u6240\u4ee5\u6211\u4eec\u5728\u8fd9\u91cc\u4e5f\u5bf9\u521b\u5efa\u524d\u7f00\u7d22\u5f15\u7684\u65b9\u6cd5\u4ecb\u7ecd\u4e00\u4e0b\u3002<\/p>\n
    MySQL \u5e76\u4e0d\u652f\u6301\u5bf9\u8fd9\u4e9b\u957f\u5b57\u7b26\u7c7b\u578b\u5217\u7684\u5b8c\u6574\u5185\u5bb9\u8fdb\u884c\u7d22\u5f15\uff0c\u6211\u4eec\u9009\u62e9\u524d\u7f00\u957f\u5ea6\u7684\u5173\u952e\u70b9\u5728\u4e8e\uff1a\u65e2\u8981\u4fdd\u8bc1\u9009\u62e9\u8db3\u591f\u957f\u7684\u524d\u7f00\u4f7f\u5f97\u9009\u62e9\u6027\u8f83\u9ad8\uff0c\u540c\u65f6\u53c8\u4e0d\u80fd\u592a\u957f\u9632\u6b62\u5360\u7528\u592a\u591a\u7684\u7a7a\u95f4\u3002<\/p>\n
    \u53ef\u4ee5\u6839\u636e\u5982\u4e0b\u65b9\u6cd5\u6765\u786e\u5b9a\u524d\u7f00\u7684\u957f\u5ea6\uff1a<\/p>\n
    \u9996\u5148\uff0c\u67e5\u770b\u8981\u6dfb\u52a0\u7d22\u5f15\u7684\u5217\u51fa\u73b0\u6700\u9891\u7e41\u7684\u4e00\u4e9b\u503c\uff1a<\/p>\n
    select count(0) as c, specific_column\nfrom specific_table\ngroup by specific_column\norder by c desc\nlimit 10;\n<\/code><\/pre>\n
    \u4e4b\u540e\u5148\u4ece 3 \u4e2a\u524d\u7f00\u5b57\u6bcd\u5f00\u59cb\u5339\u914d\u5c1d\u8bd5\uff1a<\/p>\n
    select count(0) as c, left(specific_column, 3) as pref\nfrom specific_table\ngroup by pref\norder by c desc\nlimit 10;\n<\/code><\/pre>\n
    \u6162\u6162\u5730\u589e\u52a0\u524d\u7f00\u957f\u5ea6\uff0c\u76f4\u5230\u8fd9\u4e2a\u524d\u7f00\u7684\u9009\u62e9\u6027\u63a5\u8fd1\u6211\u4eec\u9996\u6b21\u67e5\u8be2\u7684\u5b8c\u6574\u5217\u7684\u9009\u62e9\u6027\u5373\u53ef\u3002<\/p>\n
    \u6216\u8005\uff0c\u91c7\u7528\u5982\u4e0b\u7684\u65b9\u6cd5\uff0c\u5148\u8ba1\u7b97\u51fa\u5b8c\u6574\u5217\u7684\u9009\u62e9\u6027\uff1a<\/p>\n
    select count(distinct specific_column) \/ count(0)\nfrom specific_table;\n<\/code><\/pre>\n
    \u7136\u540e\u5206\u522b\u8ba1\u7b97\u4e0d\u540c\u524d\u7f00\u7684\u9009\u62e9\u6027\uff0c\u76f4\u5230\u627e\u5230\u4e0e\u5b8c\u6574\u5217\u63a5\u8fd1\u7684\u9009\u62e9\u6027\u524d\u7f00\u957f\u5ea6\u5373\u53ef\uff1a<\/p>\n
    select count(distinct left(specific_column, 3)) \/ count(0) as sel3,\ncount(distinct left(specific_column, 4)) \/ count(0) as sel4,\ncount(distinct left(specific_column, 5)) \/ count(0) as sel5,\ncount(distinct left(specific_column, 6)) \/ count(0) as sel6,\ncount(distinct left(specific_column, 7)) \/ count(0) as sel7\nfrom specific_table;\n<\/code><\/pre>\n
    \u4e0d\u8fc7\uff0c\u4e5f\u6709\u4f8b\u5916\u7684\u60c5\u51b5\uff0c\u90a3\u5c31\u662f\u5373\u4f7f\u73b0\u5728\u6211\u4eec\u9009\u62e9\u4e86\u6bd4\u8f83\u63a5\u8fd1\u5b8c\u6574\u5217\u9009\u62e9\u6027\u7684\u524d\u7f00\uff0c\u4f46\u6570\u636e\u7684\u5206\u5e03\u4ecd\u7136\u5f88\u4e0d\u5747\u5300\u3002<\/p>\n
    \u8fd9\u65f6\u6211\u4eec\u9700\u8981\u7528\u8be5\u524d\u7f00\u6267\u884c\u5982\u4e0b\u67e5\u8be2\uff0c\u5e76\u4e0e\u5b8c\u6574\u5217\u67e5\u8be2\u51fa\u7684\u6570\u76ee\u4f5c\u6bd4\u8f83\uff0c\u89c2\u5bdf\u8fd9\u4e9b\u51fa\u73b0\u9891\u7387\u6700\u9ad8\u7684\u524d\u7f00\u503c\u4e0e\u5b8c\u6574\u5217\u51fa\u73b0\u9891\u7387\u662f\u5426\u63a5\u8fd1\uff0c\u5426\u7684\u8bdd\u9700\u8981\u518d\u5c06\u524d\u7f00\u503c\u8c03\u5927\u3002<\/p>\n
    select count(0) as c, left(specific_column, 5) as pref\nfrom specific_table\ngroup by pref\norder by c desc\nlimit 10;\n\n-- \u5b8c\u6574\u5217\u7684\u51fa\u73b0\u9891\u7387\nselect count(0) as c, specific_column\nfrom specific_table\ngroup by specific_column\norder by c desc\nlimit 10;\n<\/code><\/pre>\n
    \u6700\u540e\uff0c\u627e\u5230\u5408\u9002\u7684\u524d\u7f00\u6570\u521b\u5efa\u524d\u7f00\u7d22\u5f15\u53ef\u4ee5\u4f7f\u7528\u5982\u4e0b SQL\uff1a<\/p>\n
    alter table specific_table add index index_specific_column(specific_column(7));\n<\/code><\/pre>\n
    \u867d\u7136\u524d\u7f00\u7d22\u5f15\u80fd\u591f\u4f7f\u7d22\u5f15\u66f4\u5c0f\uff0c\u66f4\u5feb\uff0c\u4f46\u662f\u6211\u4eec\u4e0d\u80fd\u4f7f\u7528\u524d\u7f00\u7d22\u5f15\u505a ORDER BY \u548c GROUP BY \u64cd\u4f5c\uff0c\u4e5f\u65e0\u6cd5\u4f7f\u7528\u524d\u7f00\u7d22\u5f15\u505a\u7d22\u5f15\u8986\u76d6\u3002<\/p>\n
    2. \u5173\u4e8e\u7d22\u5f15\u5fc5\u987b\u77e5\u9053\u7684\u4e8b\u513f<\/h2>\n
    \u4e0b\u6587\u4e2d\u6211\u4eec\u6240\u8bf4\u7684\u7d22\u5f15\u5982\u679c\u6ca1\u6709\u7279\u522b\u6307\u660e\u7c7b\u578b\uff0c\u90a3\u4e48\u5c31\u4ee3\u8868\u6211\u4eec\u8bf4\u7684\u662f B+ Tree \u7d22\u5f15\uff0c\u5b83\u4f7f\u7528 B+ Tree \u6570\u636e\u7ed3\u6784\u6765\u4fdd\u5b58\u6570\u636e\u3002<\/p>\n
    B+ Tree \u4f1a\u5c06\u6240\u6709\u7684\u6570\u636e\u4fdd\u5b58\u5728\u53f6\u5b50\u8282\u70b9\u4e0a\uff0c\u5e76\u4e14\u901a\u8fc7\u53cc\u5411\u94fe\u8868\u5c06\u53f6\u5b50\u8282\u70b9\u8fde\u63a5\u8d77\u6765\u3002<\/p><\/blockquote>\n
    \u805a\u7c07\u7d22\u5f15<\/h4>\n
    \u805a\u7c07\u7d22\u5f15\u5e76\u4e0d\u662f\u4e00\u79cd\u5355\u72ec\u7684\u7d22\u5f15\u7c7b\u578b\uff0c\u800c\u662f\u4e00\u79cd\u6570\u636e\u5b58\u50a8\u65b9\u5f0f<\/strong>\uff0cInnoDB \u805a\u7c07\u7d22\u5f15\u5728\u6570\u636e\u9875\u4e2d\u540c\u65f6\u4fdd\u5b58\u7d22\u5f15\u548c\u6570\u636e\u884c\uff0c\u8fd9\u4f7f\u5f97\u5b83\u7684\u6570\u636e\u8bbf\u95ee\u76f8\u6bd4\u4e8e\u975e\u805a\u7c07\u7d22\u5f15\uff08\u4e8c\u7ea7\u7d22\u5f15\uff09\u8981\u5feb\u3002<\/p>\n
    \u805a\u7c07\u7684\u610f\u601d\u662f\u8bf4 \u6570\u636e\u884c\u548c\u76f8\u90bb\u7684\u952e\u503c\u7d27\u51d1\u7684\u5b58\u50a8\u5728\u4e00\u8d77<\/strong>\uff0c\u56e0\u4e3a\u65e0\u6cd5\u540c\u65f6\u628a\u6570\u636e\u884c\u653e\u5728\u4e24\u4e2a\u4e0d\u540c\u7684\u5730\u65b9\uff0c\u6240\u4ee5\u4e00\u4e2a\u8868\u53ea\u80fd\u6709\u4e00\u4e2a\u805a\u7c07\u7d22\u5f15\u3002InnoDB \u6839\u636e \u4e3b\u952e<\/strong> \u805a\u7c07\u6570\u636e\uff0c\u5982\u679c\u6ca1\u6709\u5b9a\u4e49\u4e3b\u952e\uff0cInnoDB \u4f1a\u81ea\u52a8\u751f\u6210\u4e00\u4e2a\u552f\u4e00\u7684\u9690\u5f0f\u4e3b\u952e\u4f5c\u4e3a\u805a\u7c07\u7d22\u5f15\u3002<\/p>\n
    \u6211\u4eec\u521b\u5efa\u4e00\u4e2a\u7b80\u5355\u7684\u8868\uff0c\u5e76\u63d2\u5165\u4e00\u4e9b\u6570\u636e\uff0c\u6765\u770b\u4e00\u4e0b B+ Tree \u7d22\u5f15\u7684\u6570\u636e\u7ed3\u6784\u56fe\uff1a<\/p>\n
    create table demo (\n    c1 int,\n    c2 int,\n    c3 char(1),\n    primary key(c1)\n)engine=InnoDB;\n<\/code><\/pre>\n
    MySQL \u662f\u901a\u8fc7 \u6570\u636e\u9875<\/strong> \u6765\u4fdd\u5b58\u6570\u636e\u7684\uff0c\u6bcf\u4e2a\u9875\u7684\u5927\u5c0f\u9ed8\u8ba4\u4e3a 16KB\uff0c\u5728\u6bcf\u4e2a\u6570\u636e\u9875\u4e2d\u90fd\u9ed8\u8ba4\u6709\u6700\u5c0f\u8bb0\u5f55 Infimum<\/strong> \u548c\u6700\u5927\u8bb0\u5f55 Supremum<\/strong>\uff0c\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n
    \"\"<\/p>\n
    \u6211\u4eec\u53ef\u4ee5\u53d1\u73b0\u5728\u53f6\u5b50\u8282\u70b9\u4e2d\u4fdd\u5b58\u4e86\u6240\u6709\u6570\u636e\u884c\uff0c\u6bcf\u4e2a\u9875\u4e4b\u95f4\u901a\u8fc7\u9875\u6587\u4ef6\u5934\u90e8\uff08File Header<\/strong>\uff09\u8bb0\u5f55\u7684\u53cc\u5411\u94fe\u8868\u6307\u9488\u8fdb\u884c\u8fde\u63a5\uff0c\u6570\u636e\u8bb0\u5f55\u4e4b\u95f4\u901a\u8fc7\u5355\u5411\u94fe\u8868\u8fde\u63a5\uff0c\u5355\u5411\u94fe\u8868\u7684\u6307\u9488\u8bb0\u5f55\u5728\u6bcf\u884c\u6570\u636e\u8bb0\u5f55\u7684 \u8bb0\u5f55\u5934\u4fe1\u606f<\/strong> \u4e2d\u3002<\/p>\n
    \u5728\u975e\u53f6\u5b50\u8282\u70b9\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u53d1\u73b0\u8bb0\u5f55\u7684\u4fe1\u606f\u53ea\u6709 \u4e3b\u952e\u503c\u548c\u5bf9\u5e94\u7684\u9875\u53f7<\/strong>\uff0c\u56e0\u6b64\u6570\u636e\u9875\u80fd\u5b58\u653e\u7684\u6570\u636e\u66f4\u591a\uff0cB+ Tree \u4e5f\u5c31\u80fd\u66f4\u52a0 \u201c\u77ee\u80d6\u201d\uff0c\u8fd9\u6837\u5c31\u80fd\u4f7f\u5f97\u78c1\u76d8 I\/O \u66f4\u5c11\u3002\u4e00\u822c\u60c5\u51b5\u4e0b\u6211\u4eec\u7528\u5230\u7684 B+ Tree \u4e0d\u4f1a\u8d85\u8fc7 4 \u5c42\u3002<\/p>\n
    B+ Tree \u6309\u7167\u7d22\u5f15\u5217\u6570\u636e\u7684\u5927\u5c0f\u987a\u5e8f\u6392\u5e8f\u5b58\u50a8\uff0c\u6240\u4ee5\u5f88\u9002\u5408\u6309\u7167\u8303\u56f4\u6765\u67e5\u8be2\u3002\u6bcf\u6b21\u641c\u7d22\u6570\u636e\u90fd\u4ece\u7d22\u5f15\u7684\u6839\u8282\u70b9\u5f00\u59cb\uff0c\u901a\u8fc7\u6bd4\u8f83\u8282\u70b9\u4e2d\u7684\u503c\u548c\u8981\u67e5\u627e\u7684\u503c\u6765\u627e\u5230\u5408\u9002\u7684\u6307\u9488\u8fdb\u5165\u4e0b\u5c42\u5b50\u8282\u70b9\uff0c\u6700\u7ec8\u5728\u53f6\u5b50\u8282\u70b9\u4e2d\u627e\u5230\u6216\u627e\u4e0d\u5230\u5bf9\u5e94\u7684\u8bb0\u5f55\u3002<\/p>\n
    \u805a\u7c07\u7d22\u5f15\u80fd\u591f\u52a0\u5feb\u6211\u4eec\u8bbf\u95ee\u6570\u636e\u7684\u901f\u5ea6\uff0c\u4f46\u662f\u5b83\u4e5f\u6709\u4e00\u4e9b\u5c40\u9650\u6027\u6211\u4eec\u9700\u8981\u4e86\u89e3\u4e00\u4e0b\uff1a<\/p>\n
      \n
    • \u805a\u7c07\u7d22\u5f15\u6700\u5927\u9650\u5ea6\u5730\u63d0\u9ad8\u4e86 I\/O \u5bc6\u96c6\u578b\u5e94\u7528\u7684\u6027\u80fd\uff0c\u4f46\u5982\u679c \u6570\u636e\u5168\u90e8\u90fd\u653e\u5728\u5185\u5b58\u4e2d<\/strong>\uff0c\u5219\u8bbf\u95ee\u7684\u987a\u5e8f\u5c31\u6ca1\u90a3\u4e48\u91cd\u8981\u4e86\uff0c\u805a\u7c07\u7d22\u5f15\u4e5f\u5c31\u6ca1\u4ec0\u4e48\u4f18\u52bf\u4e86<\/li>\n
    • \u968f\u7740 RAM \u53d8\u5f97\u66f4\u4fbf\u5b9c\uff0c\u800c\u4e14\u8bb8\u591a\u6570\u636e\u96c6\u4e0d\u662f\u90a3\u4e48\u5927\uff0c\u6240\u4ee5\u5c06\u5b83\u4eec\u5168\u90e8\u4fdd\u5b58\u5728\u5185\u5b58\u4e2d\u662f\u975e\u5e38\u53ef\u884c\u7684\uff0c\u5305\u62ec\u53ef\u80fd\u5206\u5e03\u5728\u591a\u4e2a\u670d\u52a1\u5668\u4e0a\uff0c\u8fd9\u4e5f\u4fc3\u8fdb\u4e86\u5185\u5b58\u6570\u636e\u5e93\u7684\u53d1\u5c55\u3002<\/li>\n
    • \u63d2\u5165\u901f\u5ea6\u4e25\u91cd\u4f9d\u8d56\u4e8e\u63d2\u5165\u987a\u5e8f<\/strong>\u3002\u6309\u7167\u4e3b\u952e\u7684\u987a\u5e8f\u63d2\u5165\u884c\u662f\u5c06\u6570\u636e\u52a0\u8f7d\u5230 InnoDB \u8868\u4e2d\u6700\u5feb\u7684\u65b9\u5f0f\u3002\u4f46\u5982\u679c\u4e0d\u662f\u6309\u7167\u4e3b\u952e\u7684\u987a\u5e8f\u63d2\u5165\uff0c\u4f1a\u56e0\u9875\u5206\u88c2\u5f71\u54cd\u63d2\u5165\u901f\u5ea6\u3002\u6700\u597d\u907f\u514d\u968f\u673a\u7684\u805a\u7c07\u7d22\u5f15\uff0c\u7279\u522b\u662f\u5bf9\u4e8e I\/O \u5bc6\u96c6\u578b\u7684\u5e94\u7528<\/li>\n
    • \u805a\u7c07\u7d22\u5f15\u5217\u66f4\u65b0\u7684\u4ee3\u4ef7\u5f88\u9ad8\uff0c\u56e0\u4e3a\u5b83\u4f1a\u5f3a\u5236 InnoDB \u5c06\u6bcf\u4e2a\u88ab\u66f4\u65b0\u7684\u884c\u79fb\u52a8\u5230\u65b0\u7684\u4f4d\u7f6e\uff0c\u8fd9\u4e5f\u4f1a\u53d1\u751f\u9875\u5206\u88c2\uff0c\u5bfc\u81f4\u6027\u80fd\u4e0b\u964d<\/li>\n<\/ul>\n
      \u4e8c\u7ea7\u7d22\u5f15<\/h4>\n
      \u4e8c\u7ea7\u7d22\u5f15\u662f\u975e\u805a\u7c07\u7d22\u5f15\uff0cInnoDB \u5f15\u64ce\u5728 B+ Tree \u7684\u53f6\u5b50\u8282\u70b9\u5b58\u50a8\u7684\u4e0d\u662f\u5b8c\u6210\u7684\u6570\u636e\u8bb0\u5f55\uff0c\u800c\u53ea\u662f \u7d22\u5f15\u5217\u548c\u4e3b\u952e\u5217\u7684\u503c<\/strong>\u3002\u5982\u679c\u5728\u67e5\u8be2\u65f6\u6ca1\u6709\u53d1\u751f\u8986\u76d6\u7d22\u5f15\u7684\u8bdd\uff0c\u9700\u8981\u6839\u636e\u4e3b\u952e\u503c\u8fdb\u884c\u56de\u8868\u64cd\u4f5c\u4ee5\u83b7\u53d6\u9700\u8981\u7684\u7ed3\u679c\u3002<\/p>\n
      \u4e8c\u7ea7\u7d22\u5f15\u662f\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7684\u57fa\u7840\uff0c\u5e76\u4e14\u5728\u6587\u6863\u6570\u636e\u5e93\u4e2d\u4e5f\u5f88\u666e\u904d\u3002\u8bb8\u591a\u952e\u503c\u5b58\u50a8\uff08\u5982 HBase \u548c Volde-mort\uff09\u4e3a\u4e86\u51cf\u5c11\u5b9e\u73b0\u7684\u590d\u6742\u5ea6\u800c\u653e\u5f03\u4e86\u4e8c\u7ea7\u7d22\u5f15\uff0c\u4f46\u662f\u4e00\u4e9b\uff08\u5982 Riak\uff09\u5df2\u7ecf\u5f00\u59cb\u6dfb\u52a0\u5b83\u4eec\uff0c\u56e0\u4e3a\u5b83\u4eec\u5bf9\u4e8e\u6570\u636e\u6a21\u578b\u5b9e\u5728\u662f\u592a\u6709\u7528\u4e86\u3002\u5e76\u4e14\u6b21\u7ea7\u7d22\u5f15\u4e5f\u662f Solr \u548c Elasticsearch \u7b49\u641c\u7d22\u670d\u52a1\u5668\u7684\u57fa\u77f3\u3002<\/p>\n
      \u5b9e\u9645\u4e0a\uff0c\u6709\u4e24\u79cd\u7528\u4e8c\u7ea7\u7d22\u5f15\u5bf9\u6587\u6863\u6570\u636e\u5e93\u8fdb\u884c\u5206\u533a\u7684\u65b9\u6cd5\uff1a\u57fa\u4e8e\u6587\u6863\uff08document-based\uff09<\/strong> \u7684\u5206\u533a \u548c \u57fa\u4e8e\u5173\u952e\u8bcd\uff08term-based\uff09<\/strong> \u7684\u5206\u533a\u3002<\/p>\n
      *\u57fa\u4e8e\u6587\u6863\u7684\u5206\u533a<\/h5>\n
      \u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a\u6c7d\u8f66\u9500\u552e\u7f51\u7ad9\uff0c\u6bcf\u6761\u6570\u636e\u90fd\u6709\u552f\u4e00\u7684 ID\uff0c\u6211\u4eec\u79f0\u4e4b\u4e3a\u6587\u6863 ID\u3002\u6211\u4eec\u4f7f\u7528\u6587\u6863 ID \u8fdb\u884c\u5206\u533a\uff0c\u5e76\u4e3a\u6c7d\u8f66\u989c\u8272\u5b57\u6bb5\u521b\u5efa\u4e8c\u7ea7\u7d22\u5f15\uff0c\u5206\u533a\u7ed3\u679c\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n
      \"\"<\/p>\n
      \u8fd9\u6837\u7684\u4e8c\u7ea7\u7d22\u5f15\u5206\u914d\u65b9\u6cd5\uff0c\u4f7f\u5f97\u6bcf\u4e2a\u5206\u533a\u90fd\u662f\u72ec\u7acb\u7684\uff1a\u6bcf\u4e2a\u5206\u533a\u81ea\u5df1\u7ef4\u62a4\u81ea\u5df1\u7684\u7d22\u5f15\uff0c\u5b83\u4e0d\u5173\u5fc3\u5176\u4ed6\u5206\u533a\u7684\u6570\u636e\uff0c\u8fd9\u79cd\u6587\u6863\u5206\u533a\u7d22\u5f15\u4e5f\u88ab\u79f0\u4e3a \u672c\u5730\u7d22\u5f15<\/strong>\u3002<\/p>\n
      \u5f53\u6211\u4eec\u67e5\u8be2\u7ea2\u8272\u7684\u6c7d\u8f66\u65f6\uff0c\u9700\u8981\u5c06\u8bf7\u6c42\u53d1\u5e03\u5230\u6240\u6709\u7684\u5206\u533a\uff0c\u5e76\u5408\u5e76\u6240\u6709\u8fd4\u56de\u7684\u7ed3\u679c\uff0c\u8fd9\u79cd\u67e5\u8be2\u6570\u636e\u5e93\u7684\u65b9\u6cd5\u88ab\u79f0\u4e3a \u5206\u6563\/\u805a\u96c6<\/strong>\uff0c\u53ef\u80fd\u4f1a\u4f7f\u5f97\u4e8c\u7ea7\u7d22\u5f15\u67e5\u8be2\u6570\u636e\u6bd4\u8f83\u8017\u65f6\u3002<\/p>\n
      *\u57fa\u4e8e\u5173\u952e\u8bcd\u7684\u5206\u533a<\/h5>\n
      \u6211\u4eec\u4e5f\u53ef\u4ee5\u6784\u5efa\u4e00\u4e2a\u8986\u76d6\u6240\u6709\u5206\u533a\u6570\u636e\u7684 \u5168\u5c40\u7d22\u5f15<\/strong>\uff0c\u6bd4\u5982\u6211\u4eec\u5c06 a \u5230 r \u5f00\u5934\u7684\u989c\u8272\u7684\u4e8c\u7ea7\u7d22\u5f15\u4fdd\u5b58\u5728\u5206\u533a 0 \u4e2d\uff0c\u5c06 s \u5230 z \u7684\u4fdd\u5b58\u5728\u5206\u533a 1 \u4e2d\uff0c\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n
      \"\"<\/p>\n
      \u6211\u4eec\u5c06\u8fd9\u79cd\u5206\u533a\u65b9\u6cd5\u79f0\u4e3a \u5173\u952e\u8bcd\u5206\u533a<\/strong>\uff0c\u6839\u636e\u5173\u952e\u8bcd\u672c\u8eab\u5206\u533a\u5bf9\u4e8e\u8303\u56f4\u626b\u63cf\u975e\u5e38\u6709\u7528\uff0c\u6bd4\u5982\u8bf4\u6211\u73b0\u5728\u60f3\u83b7\u53d6 a \u5230 r \u5f00\u5934\u7684\u989c\u8272\u7684\u6240\u6709\u6c7d\u8f66\u6570\u636e\uff1b\u800c\u5bf9\u5173\u952e\u8bcd\u7684\u54c8\u5e0c\u5206\u533a\u53c8\u80fd\u591f\u63d0\u4f9b\u5206\u533a\u8d1f\u8f7d\u5747\u8861\u7684\u80fd\u529b\u3002<\/p>\n
      \u57fa\u4e8e\u5173\u952e\u8bcd\u5206\u533a\u7684\u5168\u5c40\u7d22\u5f15\u4f18\u4e8e\u6587\u6863\u5206\u533a\u7d22\u5f15\u7684\u5730\u65b9\u5728\u4e8e\u5b83\u7684\u8bfb\u53d6\u66f4\u52a0\u9ad8\u6548\uff0c\u5e76\u4e0d\u9700\u8981\u5c06\u8bf7\u6c42\u6253\u5230\u6240\u6709\u5206\u533a\u4e0a\uff0c\u53ea\u9700\u8981\u5c06\u8bf7\u6c42\u53d1\u9001\u5230\u542b\u6709\u5bf9\u5e94\u5173\u952e\u8bcd\u7684\u5206\u533a\u5373\u53ef\uff0c\u800c\u5b83\u7684\u7f3a\u70b9\u5728\u4e8e\u5bf9\u5355\u4e2a\u5206\u533a\u6587\u6863\u7684\u5199\u5165\u53ef\u80fd\u4f1a\u4ea7\u751f\u591a\u4e2a\u5206\u533a\u7684\u7d22\u5f15\u7684\u6570\u636e\u53d8\u66f4\uff0c\u9700\u8981\u534f\u8c03\u8de8\u5206\u533a\u7684\u5206\u5e03\u5f0f\u4e8b\u52a1\u3002<\/p>\n
      \u8986\u76d6\u7d22\u5f15<\/h4>\n
      \u8986\u76d6\u7d22\u5f15\u53ef\u4ee5\u7b80\u5355\u5730\u7406\u89e3\u6210 \u67e5\u8be2\u53ea\u9700\u8981\u8bbf\u95ee\u7d22\u5f15\u5217\u800c\u65e0\u9700\u8bbf\u95ee\u5176\u4ed6\u6570\u636e\u5217<\/strong>\u3002<\/p>\n
      \u4f18\u79c0\u7684\u7d22\u5f15\u8bbe\u8ba1\u4e0d\u5355\u5355\u53ea\u8003\u8651 WHERE \u6761\u4ef6\uff0c\u4e5f\u4f1a\u6839\u636e\u60f3\u8981\u67e5\u8be2\u7684\u5217\u53bb\u7efc\u5408\u5206\u6790\u3002\u5982\u679c\u53ea\u9700\u8981\u7d22\u5f15\u5217\u7684\u8bdd\uff0c\u90a3\u4e48\u8986\u76d6\u7d22\u5f15\u662f\u975e\u5e38\u6709\u7528\u7684\u5de5\u5177\uff0c\u5b83\u80fd\u907f\u514d\u56de\u8868\u64cd\u4f5c\uff0c\u8fd9\u6837 MySQL \u5c31\u4f1a\u6781\u5927\u5730\u51cf\u5c11\u6570\u636e\u8bbf\u95ee\u91cf\uff0c\u800c\u4e14\u7d22\u5f15\u5360\u7528\u7684\u7a7a\u95f4\u5f88\u5c0f\uff0c\u5c06\u8fd9\u4e9b\u6570\u636e\u7f13\u5b58\u5728\u5185\u5b58\u4e2d\u7684\u538b\u529b\u8fdc\u5c0f\u4e8e\u7f13\u5b58\u6240\u6709\u76f8\u5173\u6570\u636e\u884c\u3002<\/p>\n
      \u5982\u679c\u4e1a\u52a1\u65e0\u9700\u67e5\u8be2\u5176\u4ed6\u5217\uff0c\u90a3\u4e48\u6211\u4eec\u6700\u597d\u628a\u4e1a\u52a1\u9700\u8981\u7684\u5217\u653e\u5728\u67e5\u8be2\u5217\u8868\u4e2d\uff0c\u4ee5\u5b9e\u73b0\u8986\u76d6\u7d22\u5f15\uff0c\u800c\u4e0d\u662f\u7b80\u5355\u5730\u4ee5 * \u6765\u66ff\u4ee3\uff1b\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u6839\u636e\u60f3\u8981\u67e5\u8be2\u7684\u5217\uff0c\u5bf9\u6240\u4f7f\u7528\u7684\u7d22\u5f15\u8fdb\u884c\u6269\u5c55\uff0c\u5373\u589e\u52a0\u60f3\u8981\u67e5\u8be2\u7684\u5217\u8fbe\u5230\u8986\u76d6\u7d22\u5f15\u7684\u76ee\u7684\u3002<\/p>\n
      \u5f53\u6267\u884c\u4e00\u4e2a\u8986\u76d6\u7d22\u5f15\u7684\u67e5\u8be2\u65f6\uff0c\u5728 EXPLAIN \u7684 Extra \u5217\u53ef\u4ee5\u770b\u5230 Using index \u7684\u4fe1\u606f\u3002<\/p><\/blockquote>\n
      \u81ea\u9002\u5e94\u54c8\u5e0c\u7d22\u5f15<\/h4>\n
      \u5b83\u662f InnoDB \u7684\u4e00\u4e2a\u7279\u6027\uff0c\u5f53 InnoDB \u53d1\u73b0\u67d0\u4e9b\u7d22\u5f15\u503c\u88ab\u975e\u5e38\u9891\u7e41\u7684\u8bbf\u95ee\u65f6\uff0c\u5b83\u4f1a\u5728\u539f\u6709\u7684 B+ Tree \u7d22\u5f15\u4e4b\u4e0a\uff0c\u518d\u5728\u5185\u5b58\u4e2d\u6784\u5efa\u4e00\u4e2a\u54c8\u5e0c\u7d22\u5f15\uff0c\u4ee5\u6b64\u6765\u52a0\u5feb\u5bf9\u5e94\u6570\u636e\u7684\u8bbf\u95ee\u3002\u8fd9\u4e2a\u8fc7\u7a0b\u662f\u81ea\u52a8\u5316\u7684\uff0c\u6211\u4eec\u65e0\u6cd5\u8fdb\u884c\u5e72\u9884\uff0c\u4e0d\u8fc7\u53ef\u4ee5\u901a\u8fc7\u53c2\u6570\u914d\u7f6e\u5c06\u5176\u5173\u95ed\u3002<\/p>\n
      \n
      \u5de8\u4eba\u7684\u80a9\u8180<\/h2>\n