\u6a21\u578b<\/a><\/p>\n\u6570\u636e\u5e93\u6982\u5ff5\u8bbe\u8ba1\u7684\u76ee\u6807<\/p>\n
1 \u5b9a\u4e49\u4e0e\u63cf\u8ff0\u5e94\u7528\u9886\u57df\u8bbe\u8ba1\u7684\u6570\u636e\u8303\u56f4 2 \u83b7\u53d6\u4fe1\u606f\u6a21\u578b 3 \u63cf\u8ff0\u6570\u636e\u7684\u5c5e\u6027\u7279\u5f81 4 \u63cf\u8ff0\u6570\u636e\u4e4b\u95f4\u7684\u5173\u7cfb 5 \u5b9a\u4e49\u548c\u63cf\u8ff0\u6570\u636e\u7684\u7ea6\u675f 6 \u8bf4\u660e\u6570\u636e\u7684\u5b89\u5168\u6027\u8981\u6c42 7 \u652f\u6301\u7528\u6237\u7684\u5404\u79cd\u6570\u636e\u5904\u7406\u9700\u6c42 8 \u4fdd\u8bc1\u4fe1\u606f\u6a21\u578b\u8f6c\u5316\u6210\u6570\u636e\u5e93\u7684\u903b\u8f91\u7ed3\u6784\uff08\u6570\u636e\u5e93\u6a21\u5f0f\uff09<\/p>\n
\u6982\u5ff5\u8bbe\u8ba1\u7684\u4f9d\u636e\u53ca\u8fc7\u7a0b<\/p>\n
\u4f9d\u636e\uff1a\u6570\u636e\u5e93\u6982\u5ff5\u8bbe\u8ba1\u4ee5\u9700\u6c42\u5206\u6790\u7684\u7ed3\u679c\u4e3a\u4f9d\u636e\uff0c\u5373\u9700\u6c42\u8bf4\u660e\u4e66\uff0cDFD\u56fe\u4ee5\u53ca\u5728\u9700\u6c42\u9636\u6bb5\u6536\u96c6\u5230\u7684\u5e94\u7528\u9886\u57df\u4e2d\u7684\u5404\u7c7b\u62a5\u8868 \u7ed3\u679c\uff1a\u6982\u5ff5\u8bbe\u8ba1\u7684\u7ed3\u679c\u662f \u6982\u5ff5\u6a21\u578b\uff08ER\uff09\u4e0e\u6982\u5ff5\u8bbe\u8ba1\u8bf4\u660e\u4e66<\/p>\n
\u8fc7\u7a0b\uff1a 1 \u660e\u786e\u5efa\u6a21\u76ee\u6807 \uff08\u6a21\u578b\u8986\u76d6\u8303\u56f4\uff09 2 \u5b9a\u4e49\u5b9e\u4f53\u96c6 \uff08\u81ea\u9876\u5411\u4e0a\u6807\u8bc6\u548c\u5b9a\u4e49\u5b9e\u4f53\u96c6\uff09 3 \u5b9a\u4e49\u8054\u7cfb \uff08\u5b9e\u4f53\u95f4\u5173\u8054\u5173\u7cfb\uff09 4 \u5efa\u7acb\u4fe1\u606f\u6a21\u578b \uff08\u6784\u9020ER \u6a21\u578b\uff09 5 \u786e\u5b9a\u5b9e\u4f53\u96c6\u5c5e\u6027 \uff08\u5c5e\u6027\u63cf\u8ff0\u4e00\u4e2a\u5b9e\u4f53\u96c6\u7684\u7279\u5f81\u6216\u6027\u8d28\uff09 6 \u5bf9\u4fe1\u606f\u6a21\u578b\u8fdb\u884c\u96c6\u6210\u4e0e\u4f18\u5316\uff08\u68c0\u67e5\u548c\u6d88\u9664\u547d\u540d\u4e0d\u4e00\u81f4\uff0c\u7ed3\u6784\u4e0d\u4e00\u81f4\u7b49\uff09 \u6982\u5ff5\u8bbe\u8ba1 \u662fDB \u8bbe\u8ba1\u7684\u6838\u5fc3\u73af\u8282\u3002\u6982\u5ff5\u6570\u636e\u6a21\u578b\u662f\u5bf9\u73b0\u5b9e\u4e16\u754c\u7684\u62bd\u8c61\u548c\u6a21\u62df<\/p>\n
\u6982\u5ff5\u6a21\u578b\u8bbe\u8ba1<\/p>\n
\u91c7\u7528\u6700\u5e7f\u6cdb\u7684\u662fER\u5efa\u6a21\u65b9\u6cd5\u3002\u5c06\u73b0\u5b9e\u4e16\u754c\u62bd\u8c61\u4e3a\u5177\u6709\u5c5e\u6027\u7684\u5b9e\u4f53\u53ca\u8054\u7cfb ER \u56fe\u63cf\u8ff0\u6570\u636e\u5e93\u7684\u6982\u5ff5\u6a21\u578b\u89c2\u70b9\uff1a \u4e16\u754c\u662f\u7531\u4e00\u7ec4 \u4f5c\u5b9e\u4f53\u7684\u57fa\u672c\u5bf9\u8c61\u548c\u8fd9\u4e9b\u5bf9\u8c61\u95f4\u7684\u8054\u7cfb\u6784\u6210<\/p>\n
\u4e0eE-R\u6a21\u578b\u6709\u5173\u7684\u6982\u5ff5<\/p>\n
\u5b9e\u4f53\u6216\u5b9e\u4f8b\uff1a\u5ba2\u89c2\u5b58\u5728\u5e76\u53ef\u76f8\u4e92\u53bb\u8ddf\u7684\u4e8b\u7269\u53eb\u5b9e\u4f53 \u5b9e\u4f53\u96c6\uff1a\u540c\u578b\u5b9e\u4f53\u7684\u96c6\u5408\u53eb\u5b9e\u4f53\u96c6 \u5c5e\u6027\uff1a\u5b9e\u4f53\u6240\u5177\u6709\u7684\u67d0\u4e00\u7279\u6027\uff0c\u4e00\u4e2a\u5b9e\u4f53\u53ef\u4ee5\u7531\u82e5\u5e72\u4e2a\u5c5e\u6027\u6765\u523b\u753b\uff0c\u6bcf\u4e2a\u5c5e\u6027\u7684\u8303\u56f4\u79f0\u4e3a\u57df \u7801\uff1a \u5b9e\u4f53\u96c6\u4e2d\u552f\u4e00\u6807\u8bc6\u6bcf\u4e00\u4e2a\u5b9e\u4f53\u7684\u5c5e\u6027\u6216\u5c5e\u6027\u96c6\u5408 \u3002\u7528\u6765\u533a\u522b\u540c\u4e00\u5b9e\u4f53\u96c6\u4e2d\u7684\u4e0d\u540c\u5b9e\u4f53\u79f0\u4f5c\u4e3b\u7801\u3002\u4e00\u4e2a\u5b9e\u4f53\u96c6\u4e2d\u4efb\u610f\u4e24\u4e2a\u5b9e\u4f53\u5728\u4e3b\u7801\u7684\u53d6\u503c\u4e0a\u4e0d\u80fd\u76f8\u540c \u8054\u7cfb\uff1a \u63cf\u8ff0\u5b9e\u4f53\u4e4b\u95f4\u7684\u76f8\u4e92\u5173\u7cfb \u8054\u7cfb\u4e5f\u53ef\u4ee5\u6709\u5c5e\u6027\uff0c\u540c\u7c7b\u8054\u7cfb\u7684\u96c6\u5408 \u79f0\u4e3a\u8054\u7cfb\u96c6<\/p>\n
\u5b9e\u4f53\u95f4\u7684\u8054\u7cfb\u6709\u4e09\u7c7b\uff1a 1\u5bf91\u8054\u7cfb\uff1a \u2018\u7cfb\u2019\u4e0e\u2018\u7cfb\u4e3b\u4efb\u2019\uff08\u4e00\u4e2a\u7cfb\u53ea\u6709\u4e00\u4e2a\u7cfb\u4e3b\u4efb\uff0c\u4e00\u4e2a\u7cfb\u4e3b\u4efb\u53ea\u80fd\u7ba1\u7406\u4e00\u4e2a\u7cfb\uff09 1 \u5bf9\u591a\u8054\u7cfb\uff081\uff1an\uff09\uff1a \u2018\u7cfb\u2019\u4e0e\u2018\u5b66\u751f\u2019\uff08\u4e00\u4e2a\u7cfb\u62db\u6536\u82e5\u5e72\u4e2a\u5b66\u751f\uff0c\u4e00\u4e2a\u5b66\u751f\u53ea\u5c5e\u4e8e\u4e00\u4e2a\u7cfb\uff09 \u591a\u5bf9\u591a\u8054\u7cfb\uff08n\uff1an\uff09\uff1a \u5b66\u751f\u4e0e\u8bfe\u7a0b\uff08\u4e00\u540d\u5b66\u751f\u53ef\u9009\u4fee\u591a\u95e8\u8bfe\u7a0b\uff0c\u6bcf\u95e8\u8bfe\u7a0b\u53ef\u88ab\u591a\u540d\u5b66\u751f\u9009\u4fee\uff09<\/p>\n
E-R \u56fe\u8868\u793a<\/p>\n
<\/p>\n
<\/p>\n
IDEF1X\u5efa\u6a21\u65b9\u6cd5<\/p>\n
IDEF0 \u529f\u80fd\u5efa\u6a21\u65b9\u6cd5 IDEF1X \u662f\u6570\u636e\u5efa\u6a21\u65b9\u6cd5<\/p>\n
\u6570\u636e\u5e93\u903b\u8f91\u8bbe\u8ba1<\/p>\n
\u903b\u8f91\u8bbe\u8ba1\u7684\u4efb\u52a1\uff1a \u5c06\u6982\u5ff5\u6a21\u578b\uff08ER\u56fe\uff09\u8f6c\u5316\u4e3aDBMS \u652f\u6301\u7684\u6570\u636e\u6a21\u578b\uff08\u5173\u7cfb\u6a21\u578b\uff09\uff0c\u5e76\u5bf9\u5176\u4f18\u5316<\/p>\n
\u903b\u8f91\u8bbe\u8ba1\u7684\u4f9d\u636e\u4e0e\u9636\u6bb5\u76ee\u6807<\/p>\n
<\/p>\n
\u8865\u5145\u7684\u76f8\u5173\u6982\u5ff5<\/p>\n
1 \u5173\u7cfb\u6a21\u578b 2 \u6570\u636e\u4f9d\u8d56 3 \u5019\u9009\u7801 \u4e3b\u7801 \u5916\u7801 4 \u6570\u636e\u89c4\u8303\u5316 5 \u8303\u5f0f<\/p>\n
\u5173\u7cfb\u6a21\u578b<\/p>\n
\u5c42\u6b21\u6a21\u578b\uff1b\u7f51\u72b6\u6a21\u578b\uff1b\u5173\u7cfb\u6a21\u578b \u5173\u7cfb\u6a21\u578b\uff1a\u7b80\u5355\u7075\u6d3b\uff0c\u6709\u575a\u5b9e\u7684\u7406\u8bba\u57fa\u7840\uff0c\u79f0\u4e3a\u5f53\u4e0b\u6700\u6d41\u884c\u7684\u6570\u636e\u6a21\u578b \u5173\u7cfb\u6a21\u578b\uff1a\u7528\u4e8c\u7ef4\u8868\u7ed3\u6784\u6765\u8868\u793a\u5b9e\u4f53\u4e0e\u5b9e\u4f53\u95f4\u4e4b\u95f4\u8054\u7cfb\u7684\u6a21\u578b \u5173\u7cfb\u7684\u63cf\u8ff0\u79f0\u4e3a \u5173\u7cfb\u6a21\u5f0f \u7531\u4e94\u90e8\u5206 \u7ec4\u6210 \u4e94\u5143\u7ec4 R(U\uff0cD,DOM\uff0cF) R \uff1a\u5173\u7cfb\u540d U : \u7ec4\u6210\u8be5\u5173\u7cfb\u7684\u5c5e\u6027\u540d\u96c6\u5408 D \uff1a\u5c5e\u6027\u7ec4\u4e2dU \u4e2d\u5c5e\u6027\u6240\u6765\u81ea\u7684\u57df DOM : \u5c5e\u6027\u5230\u57df\u7684\u6620\u5c04 F : \u5c5e\u6027\u7ec4\u4e0aU \u4e0a\u7684\u4e00\u7ec4\u4f9d\u8d56\u6570\u636e \u7531\u4e8eD,DOM \u5bf9\u6a21\u5f0f\u7684\u8bbe\u8ba1\u5173\u7cfb\u4e0d\u5927\uff0c\u8fd9\u91cc\u628a\u5173\u7cfb\u6a21\u5f0f\u7b80\u5316\u4e00\u4e2a\u4e09\u5143\u7ec4 R\u5f53\u4e14\u4ec5\u5f53 U \u4e0a\u7684\u4e00\u4e2a\u5173\u7cfbR \u6ee1\u8db3F\u65f6 \uff0cR \u79f0\u4e3a\u5173\u7cfb\u6a21\u5f0f R \u7684\u4e00\u4e2a\u5173\u7cfb<\/p>\n
\u5173\u7cfb\u6570\u636e\u5e93\u8bbe\u8ba1\u7684\u6838\u5fc3\uff1a \u5173\u7cfb\u6a21\u5f0f\u7684\u8bbe\u8ba1 \u5173\u7cfb\u6a21\u5f0f\u8bbe\u8ba1\u76ee\u6807\uff1a \u6309\u7167\u4e00\u5b9a\u7684\u539f\u5219\u4ece\u6570\u91cf\u4f17\u591a\u800c\u76f8\u4e92\u5173\u8054\u7684\u6570\u636e\u4e2d\uff0c\u6784\u9020\u51fa\u4e00\u7ec4\u65e2\u80fd\u8f83\u597d\u53cd\u6620\u73b0\u5b9e\u4e16\u754c\uff0c\u800c\u53c8\u6709\u826f\u597d\u7684\u64cd\u4f5c\u6027\u80fd\u7684\u5173\u7cfb\u6a21\u5f0f<\/p>\n
\u65b0\u5965\u5c14\u826f\u53d1\uff1b\u6570\u636e\u5e93\u8bbe\u8ba1\u6b65\u9aa4\uff1a \u9700\u6c42\u5206\u6790 – \u6982\u5ff5\u7ed3\u6784\u8bbe\u8ba1 – \u903b\u8f91\u7ed3\u6784\u8bbe\u8ba1 – \u7269\u7406\u7ed3\u6784\u8bbe\u8ba1<\/p>\n
\u6570\u636e\u4f9d\u8d56\uff1a \u5bf9\u4e8eR(U)\u4efb\u610f\u4e00\u4e2a\u53ef\u80fd\u7684\u5173\u7cfbr,r\u4e2d\u4e0d\u53ef\u80fd\u5b58\u5728\u8fde\u4e2a\u5143\u7ec4 \u5728X \u4e0a\u7684\u5c5e\u6027\u503c\u4e0d\u7b49\uff0cx\u51fd\u6570\u786e\u5b9ay,y\u51fd\u6570\u4f9d\u8d56x \u2192y \u5173\u7cfb\u5185\u90e8 \u5c5e\u6027\u4e0e\u5c5e\u6027\u4e4b\u95f4\u7684\u4e00\u79cd\u7ea6\u675f\u5173\u7cfb \u73b0\u5b9e\u4e16\u754c\u5c5e\u6027\u95f4\u76f8\u4e92\u5173\u7cfb\u7684\u62bd\u8c61 \u6570\u636e\u7684\u5185\u5728\u6027\u8d28 \u8bed\u4e49\u7684\u4f53\u73b0<\/p>\n
\u5b8c\u6574\u7ea6\u675f\u7684\u8868\u73b0\u5f62\u5f0f \u9650\u5b9a\u5c5e\u6027\u7684\u53d6\u503c\u8303\u56f4 age<\/p>\n
\u6570\u636e\u4f9d\u8d56\u7c7b\u578b\uff1a \u51fd\u6570\u4f9d\u8d56\uff08Functional Dependency,FD\uff09\uff1a \u666e\u904d\u5b58\u5728\u4e8e\u751f\u6d3b\u4e2d\uff0c\u8fd9\u79cd\u4f9d\u8d56\u5173\u7cfb\u96f7\u58eb\u4e0e\u6570\u5b66\u4e2d\u7684\u51fd\u6570 y = f(x), y \u7531 x \u5b9a \u5982 \u5173\u7cfb \uff1a\u516c\u6c11\uff08\u8eab\u4efd\u8bc1\u53f7\uff0c\u59d3\u540d\uff0c\u5730\u5740\uff0c\u5de5\u4f5c\u5355\u4f4d\uff09 \u8eab\u4efd\u8bc1\u53f7\u786e\u5b9a\uff1b\u5176\u5730\u5740\u5c31\u552f\u4e00\u786e\u5b9a\uff1b\u5730\u5740\u51fd\u6570\u4f9d\u8d56\u4e8e\u8eab\u4efd\u8bc1\u53f7 \u59d3\u540d\u786e\u5b9a\u4e0d\u4e00\u5b9a\u80fd\u786e\u5b9a\u5730\u5740<\/p>\n
\u591a\u503c\u4f9d\u8d56\uff08Multivalues Dependency MD\uff09 \u6559\u5e08\u53f7\u53ef\u80fd\u591a\u503c\u4f9d\u8d56\u8bfe\u7a0b\u53f7\uff0c\u56e0\u4e3a\u7ed9\u5b9a\u4e00\u4e2a\uff08\u8bfe\u7a0b\u53f7\uff1b\u53c2\u8003\u4e66\u53f7\uff09\u7684\u7ec4\u5408\uff0c\u53ef\u80fd\u5bf9\u5e94\u591a\u4e2a\u6559\u5e08\u53f7\u3002\u56e0\u4e3a\u591a\u4e2a\u8001\u5e08\u53ef\u4ee5\u4f7f\u7528\u76f8\u540c\u6216\u4e0d\u540c\u7684\u53c2\u8003\u4e66\u4e0a\u540c\u4e00\u95e8\u8bfe \u7b80\u5355\u70b9\u8bb2\uff1a \u51fd\u6570\u5c31\u662f\u552f\u4e00\u7684\u786e\u5b9a\u5173\u7cfb\uff1b\u591a\u503c\u4f9d\u8d56\u5374\u4e0d\u80fd\u552f\u4e00\u786e\u5b9a<\/p>\n
\u51fd\u6570\u4f9d\u8d56\u7684\u51e0\u79cd\u7279\u4f8b\uff1a 1 \u5e73\u51e1\u51fd\u6570\u4f9d\u8d56\u4e0e\u975e\u5e73\u51e1\u51fd\u6570\u4f9d\u8d56 X \u2192 Y \u4e14 Y \u4e0d\u5305\u542b\u4e8e X \u5219X \u2192 Y \u975e\u5e73\u51e1\u4f9d\u8d56 Y \u5305\u542b\u4e8e X \u5219 X \u2192 Y \u5e73\u51e1\u51fd\u6570\u4f9d\u8d56\u5fc5\u7136\u6210\u7acb<\/p>\n
\t2 \u5b8c\u5168\u51fd\u6570\u4f9d\u8d56 \u4e0e\u90e8\u5206\u51fd\u6570\u4f9d\u8d56\n\t3 \u4f20\u9012\u51fd\u6570\u4f9d\u8d56\n\t**\uff08\u4f9d\u8d56\u5173\u7cfb \u4e0d\u660e\u767d\uff09**\n<\/code><\/pre>\n<\/p>\n\u5019\u9009\u7801\uff1b\u4e3b\u7801\uff1b\u5916\u7801 \u5019\u9009\u7801\uff1a \u67d0\u5c5e\u6027\u7684\u503c\u80fd\u552f\u4e00\u786e\u5b9a\u67d0\u4e2a\u5143\u7ec4\u7684\u503c \u5019\u9009\u7801 \u6709\u591a\u4e2a \u53ef\u4ee5\u9009\u5176\u4e2d\u7684\u4e00\u4e2a\u4f5c\u4e3a\u4e3b\u7801 \u5916\u7801\uff1a \u5c5e\u6027\u6216\u5c5e\u6027\u7ec4 X \u4e0d\u662f\u5173\u7cfb\u6a21\u5f0f R\u7684\u7801\uff08\u65e2\u4e0d\u662f\u4e3b\u7801\u4e5f\u4e0d\u662f\u5019\u9009\u7801\uff09<\/p>\n
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\u6570\u636e\u5e93\u7269\u7406\u8bbe\u8ba1<\/p>\n
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\u6570\u636e\u5e93\u7269\u7406\u8bbe\u8ba1\uff1a<\/p>\n
\u76ee\u6807\uff1a \u4f7f\u5185\u5b58\u7a7a\u95f4\u5360\u7528\u5c11\uff0c\u6570\u636e\u8bbf\u95ee\u6548\u7387\u9ad8\u548c\u7ef4\u62a4\u4ee3\u4ef7\u4f4e\u7684\u6570\u636e\u5e93\u7269\u7406\u6a21\u5f0f\u3002\u6570\u636e\u5e93\u5e95\u5c42\u7269\u7406\u5b58\u50a8\u4e8e\u5b58\u53d6\uff0c\u4e0eDBS \u6240\u4f9d\u8d56\u7684\u786c\u4ef6\u73af\u5883\uff0c\u64cd\u4f5c\u7cfb\u7edf\u548cDBMS \u5bc6\u5207\u76f8\u5173\uff0c\u76ee\u524d\u5927\u90e8\u5206DBS \u90fd\u662f\u5173\u7cfb\u6570\u636e\u5e93\u7cfb\u7edf<\/p>\n
\u73af\u8282\uff1a\u4e3b\u8981\u5305\u62ec5\u4e2a\u73af\u8282 \uff081\uff09\u6570\u636e\u5e93\u903b\u8f91\u6a21\u5f0f\u7684\u63cf\u8ff0 \u6839\u636e\u6570\u636e\u5e93\u903b\u8f91\u7ed3\u6784\u4fe1\u606f\u8bbe\u8ba1\u76ee\u6807DBMS \u53ef\u652f\u6301\u7684\u5173\u7cfb\u8868\uff08\u8fd9\u91cc\u79f0\u4e3a\u57fa\u672c\u8868\uff09\u7684\u6a21\u5f0f\u4fe1\u606f\uff0c\u8fd9\u4e2a\u8fc7\u7a0b \u79f0\u4e3a \u6570\u636e\u5e93\u903b\u8f91\u6a21\u5f0f\u7684\u63cf\u8ff0 \u5173\u7cfb\u6a21\u5f0f\u53ca\u5176\u89c6\u56fe\u8f6c\u6362\u6210\u57fa\u672c\u8868\u548c\u89c6\u56fe\uff0c\u5229\u7528\u5b8c\u6574\u6027\u673a\u5236\uff08\u5982\u89e6\u53d1\u5668\uff09 \u8bbe\u8ba1\u9762\u5411\u5e94\u7528\u7684\u4e1a\u52a1\u89c4\u5219 SQL Server \u91c7\u7528 T-SQL \u8bed\u8a00 \u4e3a\u57fa\u672c\u8868\u9009\u62e9\u5408\u9002\u7684\u6587\u4ef6\u7ed3\u6784\uff08\u5806\u6587\u4ef6\uff0c\u987a\u5e8f\u6587\u4ef6\uff0c\u805a\u96c6\u6587\u4ef6\uff0c\u7d22\u5f15\u6587\u4ef6\uff0c\u6563\u5217\u6587\u4ef6\uff09 \uff082\uff09\u6587\u4ef6\u7ec4\u7ec7\u4e0e\u5b58\u53d6\u8bbe\u8ba1 \u57fa\u672c\u89c4\u5219\uff1a\u6839\u636e\u5e94\u7528\u60c5\u51b5\u5c06\u6613\u53d8\u90e8\u5206\u4e0e\u7a33\u5b9a\u90e8\u5206\uff0c\u5b58\u53d6\u8bc4\u7387\u8f83\u9ad8\u7684\u90e8\u5206\u4e0e\u5b58\u53d6\u8bc4\u7387\u8f83\u4f4e\u7684\u90e8\u5206\u5206\u6765\u5b58\u653e\uff0c\u4ee5\u63d0\u9ad8\u7cfb\u7edf\u7684\u6027\u80fd \u5206\u6790\u7406\u89e3\u6570\u636e\u5e93\u4e8b\u52a1\u8bbf\u95ee\u7279\u6027\uff0c\u4f7f\u7528\u4e8b\u52a1-\u57fa\u672c\u8868\u4ea4\u53c9\u5e94\u7528\u77e9\u9635\uff1b\u4f30\u8ba1\u5404\u4e8b\u52a1\u6267\u884c\u8bc4\u7387\uff1b\u6c47\u603b\u5404\u5f20\u8868\u57fa\u672c\u8868\u5404\u4e8b\u52a1\u64cd\u4f5c\u7684\u8bc4\u7387\u4fe1\u606f\uff1b\u6839\u636e\u7ed3\u679c\u8bbe\u8ba1\u6587\u4ef6\u7ed3\u6784<\/p>\n
\u5f71\u54cd\u6570\u636e\u6587\u4ef6\u5b58\u50a8\u7ed3\u6784\u7684\u56e0\u7d20 \u5b58\u53d6\u65f6\u95f4\uff0c\u5b58\u50a8\u7a7a\u95f4\u5229\u7528\u7387\uff0c\u7ef4\u62a4\u4ee3\u4ef7 \u8fd9\u4e09\u4e2a\u65b9\u9762\u662f\u76f8\u4e92\u77db\u76fe\u7684<\/p>\n
\u89e3\u51b3\u65b9\u6cd5 \uff1a\u9002\u5f53\u5197\u4f59\uff0c\u589e\u52a0\u805a\u9910\u529f\u80fd\uff0c\u6743\u8861\u9009\u62e9\u6298\u4e2d\u7684\u65b9\u6848<\/p>\n
DBMS \u5e38\u7528\u7684\u5b58\u53d6\u65b9\u6cd5 \u7d22\u5f15\u65b9\u6cd5\uff0c\u76ee\u524d\u4e3b\u8981\u662f B+ \u6811\u7d22\u5f15\u65b9\u6cd5 \u805a\u9910\u65b9\u6cd5 HASH \u65b9\u6cd5<\/p>\n
\u5efa\u7acb\u7d22\u5f15\u7684\u539f\u5219 \u4e00\u4e2a\u7ec4\u5c5e\u6027\u7ecf\u5e38\u5728\u64cd\u4f5c\u6761\u4ef6\u4e2d\u51fa\u73b0 \u4e00\u4e2a\u7ec4\u5c5e\u6027\u7ecf\u5e38\u5728\u8fde\u63a5\u64cd\u4f5c\u7684\u8fde\u63a5\u6761\u4ef6\u51fa\u73b0 \u4e00\u4e2a\u7ec4\u5c5e\u6027\u7ecf\u5e38\u4f5c\u4e3a\u805a\u96c6\u51fd\u6570\u7684\u53c2\u6570<\/p>\n
\u5efa\u7acb\u805a\u96c6\u7d22\u5f15\u539f\u5219 \u68c0\u7d22\u6570\u636e\u65f6\uff0c\u5e38\u4ee5\u67d0\u4e2a\u7ec4\u5c5e\u6027\u4f5c\u4e3a\u6392\u5e8f\u5206\u7ec4\u6761\u4ef6 \u68c0\u7d22\u6570\u636e\u65f6\uff0c\u5e38\u4ee5\u67d0\u4e2a\u7ec4\u5c5e\u6027\u4f5c\u4e3a\u68c0\u7d22\u9650\u5236\u6761\u4ef6\uff0c\u5e76\u8fd4\u56de\u5927\u91cf\u6570\u636e \u8868\u4e2d\u6bcf\u4e2a\u7ec4\u7684\u91cd\u590d\u6027\u5f88\u5927<\/p>\n
\uff083\uff09\u6570\u636e\u5206\u5e03\u8bbe\u8ba1 \u4e0d\u540c\u7c7b\u578b\u6570\u636e\u7684\u7269\u7406\u8bbe\u8ba1 \u5c06\u5e94\u7528\u6570\u636e\uff08\u57fa\u672c\u8868\uff09\uff0c\u7d22\u5f15\uff0c\u65e5\u5fd7\uff0c\u6570\u636e\u5e93\u5907\u4efd\u6570\u636e\u7b49\u5408\u7406\u5b89\u6392\u5728\u4e0d\u540c\u7684\u4ecb\u8d28\u4e2d<\/p>\n
\u5e94\u7528\u6570\u636e\u7684\u5212\u5206\u4e0e\u5206\u5e03 \u6839\u636e\u6570\u636e\u7684\u4f7f\u7528\u7279\u5f81\uff08\u9891\u7e41\u4f7f\u7528\u5206\u533a\u548c\u975e\u9891\u7e41\u4f7f\u7528\u5206\u533a\uff09 \u6839\u636e\u65f6\u95f4\uff0c\u5730\u70b9\u5212\u5206\uff08\u65f6\u95f4\u6216\u5730\u70b9\u76f8\u540c\u7684\u5c5e\u4e8e\u540c\u4e00\u5206\u533a\uff09 \u5206\u5e03\u5f0f\u6570\u636e\u5e93\u7cfb\u7edf\uff08DDBS \uff09\u4e2d\u7684\u6570\u636e\u5212\u5206\uff08\u6c34\u5e73\u5212\u5206\u548c\u7ad6\u76f4\u5212\u5206\uff09 \u6d3e\u751f\u5c5e\u6027\u6570\u636e\u5206\u5e03\uff08\u589e\u52a0\u6d3e\u751f\u5217\u6216\u4e0d\u5b9a\u4e49\u6d3e\u751f\u5c5e\u6027\uff09 \u5173\u7cfb\u6a21\u5f0f\u7684\u53bb\u89c4\u8303\u5316\uff08\u964d\u4f4e\u89c4\u8303\u5316\u63d0\u9ad8\u67e5\u8be2\u6548\u7387\uff09<\/p>\n
\u6c34\u5e73\u5212\u5206\uff1a \u5c06\u57fa\u672c\u8868\u5212\u5206\u4e3a\u591a\u5f20\u7684\u5177\u6709\u76f8\u540c\u5c5e\u6027\uff0c\u7ed3\u6784\u5b8c\u5168\u76f8\u540c\u7684\u5b57\u8868\uff0c\u5b57\u8868\u5305\u542b\u7684\u5143\u7ec4\u662f\u57fa\u672c\u8868\u4e2d\u5143\u7ec4\u7684\u5b50\u96c6 \u5782\u76f4\u5212\u5206 \u5c06\u57fa\u672c\u8868\u5212\u5206\u4e3a\u591a\u5f20\u5b57\u8868\uff0c\u6bcf\u5f20\u5b50\u8868\u5305\u542b\u7684\u5c5e\u6027\u662f\u539f\u57fa\u672c\u8868\u7684\u5b57\u8ff9<\/p>\n
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