{"id":4258,"date":"2020-04-10T19:26:59","date_gmt":"2020-04-10T11:26:59","guid":{"rendered":"https:\/\/damogame.cn\/wordpress\/?p=4258"},"modified":"2020-04-10T19:26:59","modified_gmt":"2020-04-10T11:26:59","slug":"%e8%81%9a%e9%9b%86%e7%b4%a2%e5%bc%95%e5%92%8c%e9%9d%9e%e8%81%9a%e9%9b%86%e7%b4%a2%e5%bc%95-%e7%ae%80%e6%9e%90%e4%b8%8e%e5%af%b9%e6%af%94","status":"publish","type":"post","link":"https:\/\/i007.cc\/wordpress\/archives\/4258","title":{"rendered":"\u805a\u96c6\u7d22\u5f15\u548c\u975e\u805a\u96c6\u7d22\u5f15 \u7b80\u6790\u4e0e\u5bf9\u6bd4"},"content":{"rendered":"<p><a href=\"https:\/\/blog.csdn.net\/qq_29373285\/article\/details\/85254407\">\u539f\u6587\u5730\u5740<\/a><\/p>\n<p>\u539f\u521bLinias \u6700\u540e\u53d1\u5e03\u4e8e2018-12-25 21:18:13 \u9605\u8bfb\u6570 12114 \u6536\u85cf<br \/>\n\u5c55\u5f00<br \/>\n\u805a\u96c6\uff08clustered\uff09\u7d22\u5f15\uff0c\u4e5f\u53eb\u805a\u7c07\u7d22\u5f15<br \/>\n\u5b9a\u4e49\uff1a\u6570\u636e\u884c\u7684\u7269\u7406\u987a\u5e8f\u4e0e\u5217\u503c\uff08\u4e00\u822c\u662f\u4e3b\u952e\u7684\u90a3\u4e00\u5217\uff09\u7684\u903b\u8f91\u987a\u5e8f\u76f8\u540c\uff0c\u4e00\u4e2a\u8868\u4e2d\u53ea\u80fd\u62e5\u6709\u4e00\u4e2a\u805a\u96c6\u7d22\u5f15\u3002<\/p>\n<p>\u6ce8\uff1a\u7b2c\u4e00\u5217\u7684\u5730\u5740\u8868\u793a\u8be5\u884c\u6570\u636e\u5728\u78c1\u76d8\u4e2d\u7684\u7269\u7406\u5730\u5740\uff0c\u540e\u9762\u4e09\u5217\u624d\u662f\u6211\u4eecSQL\u91cc\u9762\u7528\u7684\u8868\u91cc\u7684\u5217\uff0c\u5176\u4e2did\u662f\u4e3b\u952e\uff0c\u5efa\u7acb\u4e86\u805a\u96c6\u7d22\u5f15\u3002<\/p>\n<p>\u7ed3\u5408\u4e0a\u9762\u7684\u8868\u683c\u5c31\u53ef\u4ee5\u7406\u89e3\u8fd9\u53e5\u8bdd\u4e86\u5427\uff1a\u6570\u636e\u884c\u7684\u7269\u7406\u987a\u5e8f\u4e0e\u5217\u503c\u7684\u987a\u5e8f\u76f8\u540c\uff0c\u5982\u679c\u6211\u4eec\u67e5\u8be2id\u6bd4\u8f83\u9760\u540e\u7684\u6570\u636e\uff0c\u90a3\u4e48\u8fd9\u884c\u6570\u636e\u7684\u5730\u5740\u5728\u78c1\u76d8\u4e2d\u7684\u7269\u7406\u5730\u5740\u4e5f\u4f1a\u6bd4\u8f83\u9760\u540e\u3002\u800c\u4e14\u7531\u4e8e\u7269\u7406\u6392\u5217\u65b9\u5f0f\u4e0e\u805a\u96c6\u7d22\u5f15\u7684\u987a\u5e8f\u76f8\u540c\uff0c\u6240\u4ee5\u4e5f\u5c31\u53ea\u80fd\u5efa\u7acb\u4e00\u4e2a\u805a\u96c6\u7d22\u5f15\u4e86\u3002<\/p>\n<p>\u805a\u96c6\u7d22\u5f15\u5b9e\u9645\u5b58\u653e\u7684\u793a\u610f\u56fe<\/p>\n<p>\u4ece\u4e0a\u56fe\u53ef\u4ee5\u770b\u51fa\u805a\u96c6\u7d22\u5f15\u7684\u597d\u5904\u4e86\uff0c\u7d22\u5f15\u7684\u53f6\u5b50\u8282\u70b9\u5c31\u662f\u5bf9\u5e94\u7684\u6570\u636e\u8282\u70b9\uff08MySQL\u7684MyISAM\u9664\u5916\uff0c\u6b64\u5b58\u50a8\u5f15\u64ce\u7684\u805a\u96c6\u7d22\u5f15\u548c\u975e\u805a\u96c6\u7d22\u5f15\u53ea\u591a\u4e86\u4e2a\u552f\u4e00\u7ea6\u675f\uff0c\u5176\u4ed6\u6ca1\u4ec0\u4e48\u533a\u522b\uff09\uff0c\u53ef\u4ee5\u76f4\u63a5\u83b7\u53d6\u5230\u5bf9\u5e94\u7684\u5168\u90e8\u5217\u7684\u6570\u636e\uff0c\u800c\u975e\u805a\u96c6\u7d22\u5f15\u5728\u7d22\u5f15\u6ca1\u6709\u8986\u76d6\u5230\u5bf9\u5e94\u7684\u5217\u7684\u65f6\u5019\u9700\u8981\u8fdb\u884c\u4e8c\u6b21\u67e5\u8be2\uff0c\u540e\u9762\u4f1a\u8be6\u7ec6\u8bb2\u3002\u56e0\u6b64\u5728\u67e5\u8be2\u65b9\u9762\uff0c\u805a\u96c6\u7d22\u5f15\u7684\u901f\u5ea6\u5f80\u5f80\u4f1a\u66f4\u5360\u4f18\u52bf\u3002<\/p>\n<p>\u521b\u5efa\u805a\u96c6\u7d22\u5f15<\/p>\n<p>\u5982\u679c\u4e0d\u521b\u5efa\u7d22\u5f15\uff0c\u7cfb\u7edf\u4f1a\u81ea\u52a8\u521b\u5efa\u4e00\u4e2a\u9690\u542b\u5217\u4f5c\u4e3a\u8868\u7684\u805a\u96c6\u7d22\u5f15\u3002<\/p>\n<p>1.\u521b\u5efa\u8868\u7684\u65f6\u5019\u6307\u5b9a\u4e3b\u952e\uff08\u6ce8\u610f\uff1aSQL Sever\u9ed8\u8ba4\u4e3b\u952e\u4e3a\u805a\u96c6\u7d22\u5f15\uff0c\u4e5f\u53ef\u4ee5\u6307\u5b9a\u4e3a\u975e\u805a\u96c6\u7d22\u5f15\uff0c\u800cMySQL\u91cc\u4e3b\u952e\u5c31\u662f\u805a\u96c6\u7d22\u5f15\uff09<\/p>\n<p>create table t1(<br \/>\nid int primary key,<br \/>\nname nvarchar(255)<\/p>\n<p>)<br \/>\n2.\u521b\u5efa\u8868\u540e\u6dfb\u52a0\u805a\u96c6\u7d22\u5f15<\/p>\n<p>MySQL<\/p>\n<p>alter table table_name add primary key(colum_name)<br \/>\n\u503c\u5f97\u6ce8\u610f\u7684\u662f\uff0c\u6700\u597d\u8fd8\u662f\u5728\u521b\u5efa\u8868\u7684\u65f6\u5019\u6dfb\u52a0\u805a\u96c6\u7d22\u5f15\uff0c\u7531\u4e8e\u805a\u96c6\u7d22\u5f15\u7684\u7269\u7406\u987a\u5e8f\u4e0a\u7684\u7279\u6b8a\u6027\uff0c\u56e0\u6b64\u5982\u679c\u518d\u5728\u4e0a\u9762\u521b\u5efa\u7d22\u5f15\u7684\u65f6\u5019\u4f1a\u6839\u636e\u7d22\u5f15\u5217\u7684\u6392\u5e8f\u79fb\u52a8\u5168\u90e8\u6570\u636e\u884c\u4e0a\u9762\u7684\u987a\u5e8f\uff0c\u4f1a\u975e\u5e38\u5730\u8017\u8d39\u65f6\u95f4\u4ee5\u53ca\u6027\u80fd\u3002<\/p>\n<p>____________________________________________________________________________<\/p>\n<p>\u975e\u805a\u96c6\uff08unclustered\uff09\u7d22\u5f15<br \/>\n\u5b9a\u4e49\uff1a\u8be5\u7d22\u5f15\u4e2d\u7d22\u5f15\u7684\u903b\u8f91\u987a\u5e8f\u4e0e\u78c1\u76d8\u4e0a\u884c\u7684\u7269\u7406\u5b58\u50a8\u987a\u5e8f\u4e0d\u540c\uff0c\u4e00\u4e2a\u8868\u4e2d\u53ef\u4ee5\u62e5\u6709\u591a\u4e2a\u975e\u805a\u96c6\u7d22\u5f15\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>\u5176\u5b9e\u6309\u7167\u5b9a\u4e49\uff0c\u9664\u4e86\u805a\u96c6\u7d22\u5f15\u4ee5\u5916\u7684\u7d22\u5f15\u90fd\u662f\u975e\u805a\u96c6\u7d22\u5f15\uff0c\u53ea\u662f\u4eba\u4eec\u60f3\u7ec6\u5206\u4e00\u4e0b\u975e\u805a\u96c6\u7d22\u5f15\uff0c\u5206\u6210\u666e\u901a\u7d22\u5f15\uff0c\u552f\u4e00\u7d22\u5f15\uff0c\u5168\u6587\u7d22\u5f15\u3002\u5982\u679c\u975e\u8981\u628a\u975e\u805a\u96c6\u7d22\u5f15\u7c7b\u6bd4\u6210\u73b0\u5b9e\u751f\u6d3b\u4e2d\u7684\u4e1c\u897f\uff0c\u90a3\u4e48\u975e\u805a\u96c6\u7d22\u5f15\u5c31\u50cf\u65b0\u534e\u5b57\u5178\u7684\u504f\u65c1\u5b57\u5178\uff0c\u4ed6\u7ed3\u6784\u987a\u5e8f\u4e0e\u5b9e\u9645\u5b58\u653e\u987a\u5e8f\u4e0d\u4e00\u5b9a\u4e00\u81f4\u3002<\/p>\n<p>\u975e\u805a\u96c6\u7d22\u5f15\u7684\u4e8c\u6b21\u67e5\u8be2\u95ee\u9898<\/p>\n<p>\u975e\u805a\u96c6\u7d22\u5f15\u53f6\u8282\u70b9\u4ecd\u7136\u662f\u7d22\u5f15\u8282\u70b9\uff0c\u53ea\u662f\u6709\u4e00\u4e2a\u6307\u9488\u6307\u5411\u5bf9\u5e94\u7684\u6570\u636e\u5757\uff0c\u6b64\u5982\u679c\u4f7f\u7528\u975e\u805a\u96c6\u7d22\u5f15\u67e5\u8be2\uff0c\u800c\u67e5\u8be2\u5217\u4e2d\u5305\u542b\u4e86\u5176\u4ed6\u8be5\u7d22\u5f15\u6ca1\u6709\u8986\u76d6\u7684\u5217\uff0c\u90a3\u4e48\u4ed6\u8fd8\u8981\u8fdb\u884c\u7b2c\u4e8c\u6b21\u7684\u67e5\u8be2\uff0c\u67e5\u8be2\u8282\u70b9\u4e0a\u5bf9\u5e94\u7684\u6570\u636e\u884c\u7684\u6570\u636e\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>\u6709\u8868t1\uff1a<\/p>\n<p>\u5176\u4e2d\u6709 \u805a\u96c6\u7d22\u5f15clustered index(id), \u975e\u805a\u96c6\u7d22\u5f15index(username)\u3002<\/p>\n<p>&nbsp;<\/p>\n<p>\u4f7f\u7528\u4ee5\u4e0b\u8bed\u53e5\u8fdb\u884c\u67e5\u8be2\uff0c\u4e0d\u9700\u8981\u8fdb\u884c\u4e8c\u6b21\u67e5\u8be2\uff0c\u76f4\u63a5\u5c31\u53ef\u4ee5\u4ece\u975e\u805a\u96c6\u7d22\u5f15\u7684\u8282\u70b9\u91cc\u9762\u5c31\u53ef\u4ee5\u83b7\u53d6\u5230\u67e5\u8be2\u5217\u7684\u6570\u636e\u3002<\/p>\n<p>select id, username from t1 where username = &#8216;\u5c0f\u660e&#8217;<\/p>\n<p>select username from t1 where username = &#8216;\u5c0f\u660e&#8217;<br \/>\n\u4f46\u662f\u4f7f\u7528\u4ee5\u4e0b\u8bed\u53e5\u8fdb\u884c\u67e5\u8be2\uff0c\u5c31\u9700\u8981\u4e8c\u6b21\u7684\u67e5\u8be2\u53bb\u83b7\u53d6\u539f\u6570\u636e\u884c\u7684score\uff1a<\/p>\n<p>select username, score from t1 where username = &#8216;\u5c0f\u660e&#8217;<br \/>\n\u5728SQL Server\u91cc\u9762\u67e5\u8be2\u6548\u7387\u5982\u4e0b\u6240\u793a\uff0cIndex Seek\u5c31\u662f\u7d22\u5f15\u6240\u82b1\u8d39\u7684\u65f6\u95f4\uff0cKey Lookup\u5c31\u662f\u4e8c\u6b21\u67e5\u8be2\u6240\u82b1\u8d39\u7684\u65f6\u95f4\u3002\u53ef\u4ee5\u770b\u7684\u51fa\u4e8c\u6b21\u67e5\u8be2\u6240\u82b1\u8d39\u7684\u67e5\u8be2\u5f00\u9500\u5360\u6bd4\u5f88\u5927\uff0c\u8fbe\u523050%\u3002<\/p>\n<p>\u8fd9\u7bc7\u535a\u5ba2\u6709\u4e00\u4e2a\u7b80\u5355\u793a\u4f8b\uff1ahttps:\/\/blog.csdn.net\/jiadajing267\/article\/details\/54581262<\/p>\n<p>\u603b\u7ed3\u5982\u4e0b\uff1a<\/p>\n<p>\u52a8\u4f5c\u63cf\u8ff0<\/p>\n<p>\u4f7f\u7528\u805a\u96c6\u7d22\u5f15<\/p>\n<p>\u4f7f\u7528\u975e\u805a\u96c6\u7d22\u5f15<\/p>\n<p>\u5217\u7ecf\u5e38\u88ab\u5206\u7ec4\u6392\u5e8f<\/p>\n<p>\u5e94<\/p>\n<p>\u5e94<\/p>\n<p>\u8fd4\u56de\u67d0\u8303\u56f4\u5185\u7684\u6570\u636e<\/p>\n<p>\u5e94<\/p>\n<p>\u4e0d\u5e94<\/p>\n<p>\u4e00\u4e2a\u6216\u6781\u5c11\u4e0d\u540c\u503c<\/p>\n<p>\u4e0d\u5e94<\/p>\n<p>\u4e0d\u5e94<\/p>\n<p>\u5c0f\u6570\u76ee\u7684\u4e0d\u540c\u503c<\/p>\n<p>\u5e94<\/p>\n<p>\u4e0d\u5e94<\/p>\n<p>\u5927\u6570\u76ee\u7684\u4e0d\u540c\u503c<\/p>\n<p>\u4e0d\u5e94<\/p>\n<p>\u5e94<\/p>\n<p>\u9891\u7e41\u66f4\u65b0\u7684\u5217<\/p>\n<p>\u4e0d\u5e94<\/p>\n<p>\u5e94<\/p>\n<p>\u5916\u952e\u5217<\/p>\n<p>\u5e94<\/p>\n<p>\u5e94<\/p>\n<p>\u4e3b\u952e\u5217<\/p>\n<p>\u5e94<\/p>\n<p>\u5e94<\/p>\n<p>\u9891\u7e41\u4fee\u6539\u7d22\u5f15\u5217<\/p>\n<p>\u4e0d\u5e94<\/p>\n<p>\u5e94<\/p>\n<p>&nbsp;<\/p>\n<p>____________________________________________________________________________<\/p>\n<p>\u6211\u4eec\u9700\u8981\u641e\u6e05\u695a\u4ee5\u4e0b\u51e0\u4e2a\u95ee\u9898\uff1a<\/p>\n<p>\u7b2c\u4e00\uff1a\u805a\u96c6\u7d22\u5f15\u7684\u7ea6\u675f\u662f\u552f\u4e00\u6027\uff0c\u662f\u5426\u8981\u6c42\u5b57\u6bb5\u4e5f\u662f\u552f\u4e00\u7684\u5462\uff1f\u00a0 \u00a0 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