{"id":158189,"date":"2024-11-03T00:45:40","date_gmt":"2024-11-02T16:45:40","guid":{"rendered":"https:\/\/server.hk\/cnblog\/158189\/"},"modified":"2024-11-03T00:45:41","modified_gmt":"2024-11-02T16:45:41","slug":"%e9%ab%98%e6%95%88%e5%af%a6%e7%8f%be%ef%bc%9a%e5%a6%82%e4%bd%95%e5%be%9e%e4%b8%80%e5%84%84%e6%95%b8%e6%93%9a%e4%b8%ad%e8%bf%85%e9%80%9f%e5%8f%96%e5%87%ba%e5%89%8d-10%ef%bc%9f%ef%bc%88%e6%95%b8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/158189\/","title":{"rendered":"\u9ad8\u6548\u5be6\u73fe\uff1a\u5982\u4f55\u5f9e\u4e00\u5104\u6578\u64da\u4e2d\u8fc5\u901f\u53d6\u51fa\u524d 10\uff1f\uff08\u6578\u64da\u5eab\u4e00\u5104\u6578\u64da\u53d6\u524d 10\uff09"},"content":{"rendered":"

\u9ad8\u6548\u5be6\u73fe\uff1a\u5982\u4f55\u5f9e\u4e00\u5104\u6578\u64da\u4e2d\u8fc5\u901f\u53d6\u51fa\u524d 10\uff1f\uff08\u6578\u64da\u5eab\u4e00\u5104\u6578\u64da\u53d6\u524d 10\uff09<\/h1>\n

\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0c\u6578\u64da\u7684\u8655\u7406\u548c\u5206\u6790\u8b8a\u5f97\u8d8a\u4f86\u8d8a\u91cd\u8981\u3002\u5c24\u5176\u662f\u5728\u9762\u5c0d\u9f90\u5927\u7684\u6578\u64da\u96c6\u6642\uff0c\u5982\u4f55\u9ad8\u6548\u5730\u5f9e\u4e2d\u63d0\u53d6\u51fa\u6709\u50f9\u503c\u7684\u4fe1\u606f\u6210\u70ba\u4e86\u8a31\u591a\u4f01\u696d\u548c\u958b\u767c\u8005\u7684\u6311\u6230\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u5f9e\u4e00\u5104\u689d\u6578\u64da\u4e2d\u8fc5\u901f\u53d6\u51fa\u524d 10 \u689d\u6578\u64da\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u6280\u8853\u548c\u65b9\u6cd5\u3002<\/p>\n

\u6578\u64da\u5eab\u7684\u9078\u64c7<\/h2>\n

\u9996\u5148\uff0c\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u5eab\u7cfb\u7d71\u5c0d\u65bc\u9ad8\u6548\u67e5\u8a62\u81f3\u95dc\u91cd\u8981\u3002\u5e38\u898b\u7684\u6578\u64da\u5eab\u7cfb\u7d71\u5305\u62ec\u95dc\u4fc2\u578b\u6578\u64da\u5eab\uff08\u5982 MySQL\u3001PostgreSQL\uff09\u548c\u975e\u95dc\u4fc2\u578b\u6578\u64da\u5eab\uff08\u5982 MongoDB\u3001Cassandra\uff09\u3002\u5728\u8655\u7406\u5927\u6578\u64da\u6642\uff0c\u9078\u64c7\u4e00\u500b\u80fd\u5920\u652f\u6301\u9ad8\u6548\u67e5\u8a62\u7684\u6578\u64da\u5eab\u662f\u5fc5\u8981\u7684\u3002<\/p>\n

\u7d22\u5f15\u7684\u4f7f\u7528<\/h2>\n

\u5728\u6578\u64da\u5eab\u4e2d\uff0c\u7d22\u5f15\u662f\u4e00\u7a2e\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u7684\u6280\u8853\u3002\u901a\u904e\u5728\u9700\u8981\u67e5\u8a62\u7684\u5b57\u6bb5\u4e0a\u5275\u5efa\u7d22\u5f15\uff0c\u53ef\u4ee5\u986f\u8457\u6e1b\u5c11\u67e5\u8a62\u6240\u9700\u7684\u6642\u9593\u3002\u4f8b\u5982\uff0c\u5728 MySQL \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\u70ba\u67d0\u500b\u5b57\u6bb5\u5275\u5efa\u7d22\u5f15\uff1a<\/p>\n

CREATE INDEX idx_column_name ON table_name(column_name);<\/code><\/pre>\n
\u4e00\u65e6\u7d22\u5f15\u5efa\u7acb\uff0c\u67e5\u8a62\u524d 10 \u689d\u6578\u64da\u7684\u901f\u5ea6\u5c07\u5927\u5e45\u63d0\u5347\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\u67e5\u8a62\uff0c\u5f9e\u4e00\u5104\u689d\u6578\u64da\u4e2d\u63d0\u53d6\u524d 10 \u689d\uff1a<\/p>\n
SELECT * FROM table_name ORDER BY column_name LIMIT 10;<\/code><\/pre>\n
\u5206\u5340\u6280\u8853<\/h2>\n
\u5c0d\u65bc\u7279\u5225\u9f90\u5927\u7684\u6578\u64da\u96c6\uff0c\u5206\u5340\u6280\u8853\u53ef\u4ee5\u9032\u4e00\u6b65\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002\u901a\u904e\u5c07\u6578\u64da\u5206\u6210\u591a\u500b\u90e8\u5206\uff0c\u6578\u64da\u5eab\u53ef\u4ee5\u66f4\u5feb\u5730\u5b9a\u4f4d\u5230\u9700\u8981\u67e5\u8a62\u7684\u6578\u64da\u3002\u4f8b\u5982\uff0c\u5728 PostgreSQL \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\u5275\u5efa\u5206\u5340\u8868\uff1a<\/p>\n
CREATE TABLE table_name (\n    id SERIAL PRIMARY KEY,\n    column_name INT\n) PARTITION BY RANGE (column_name);<\/code><\/pre>\n
\u9019\u6a23\uff0c\u7576\u67e5\u8a62\u6642\uff0c\u6578\u64da\u5eab\u53ea\u9700\u6383\u63cf\u76f8\u95dc\u7684\u5206\u5340\uff0c\u800c\u4e0d\u662f\u6574\u500b\u8868\uff0c\u5f9e\u800c\u63d0\u9ad8\u4e86\u6548\u7387\u3002<\/p>\n
\u4f7f\u7528\u7de9\u5b58\u6280\u8853<\/h2>\n
\u7de9\u5b58\u6280\u8853\u4e5f\u662f\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u7684\u4e00\u7a2e\u6709\u6548\u65b9\u6cd5\u3002\u901a\u904e\u5c07\u5e38\u7528\u7684\u67e5\u8a62\u7d50\u679c\u5b58\u5132\u5728\u5167\u5b58\u4e2d\uff0c\u53ef\u4ee5\u907f\u514d\u91cd\u8907\u67e5\u8a62\u6578\u64da\u5eab\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528 Redis \u6216 Memcached \u4f86\u5be6\u73fe\u7de9\u5b58\u3002\u7576\u7528\u6236\u8acb\u6c42\u524d 10 \u689d\u6578\u64da\u6642\uff0c\u9996\u5148\u6aa2\u67e5\u7de9\u5b58\u4e2d\u662f\u5426\u5b58\u5728\uff0c\u5982\u679c\u5b58\u5728\u5247\u76f4\u63a5\u8fd4\u56de\uff0c\u5426\u5247\u518d\u67e5\u8a62\u6578\u64da\u5eab\u4e26\u5c07\u7d50\u679c\u5b58\u5165\u7de9\u5b58\u3002<\/p>\n
\u4e26\u884c\u8655\u7406<\/h2>\n
\u5728\u8655\u7406\u5927\u6578\u64da\u6642\uff0c\u4e26\u884c\u8655\u7406\u6280\u8853\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u6548\u7387\u3002\u901a\u904e\u5c07\u67e5\u8a62\u4efb\u52d9\u5206\u914d\u5230\u591a\u500b\u8655\u7406\u5668\u6216\u4f3a\u670d\u5668\u4e0a\uff0c\u53ef\u4ee5\u540c\u6642\u8655\u7406\u591a\u500b\u67e5\u8a62\u3002\u4f8b\u5982\uff0c\u4f7f\u7528 Apache Spark \u9032\u884c\u5206\u4f48\u5f0f\u8a08\u7b97\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u5f9e\u4e00\u5104\u689d\u6578\u64da\u4e2d\u63d0\u53d6\u524d 10 \u689d\u6578\u64da\u3002<\/p>\n
val top10 = dataFrame.orderBy($\"column_name\".desc).limit(10)<\/code><\/pre>\n
\u7e3d\u7d50<\/h2>\n
\u5f9e\u4e00\u5104\u689d\u6578\u64da\u4e2d\u8fc5\u901f\u53d6\u51fa\u524d 10 \u689d\u6578\u64da\u662f\u4e00\u9805\u6311\u6230\uff0c\u4f46\u901a\u904e\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u5eab\u3001\u4f7f\u7528\u7d22\u5f15\u3001\u5206\u5340\u6280\u8853\u3001\u7de9\u5b58\u548c\u4e26\u884c\u8655\u7406\u7b49\u65b9\u6cd5\uff0c\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002\u9019\u4e9b\u6280\u8853\u4e0d\u50c5\u9069\u7528\u65bc\u5927\u6578\u64da\u74b0\u5883\uff0c\u4e5f\u53ef\u4ee5\u61c9\u7528\u65bc\u65e5\u5e38\u7684\u6578\u64da\u8655\u7406\u4efb\u52d9\u3002<\/p>\n
\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684\u6578\u64da\u8655\u7406\u89e3\u6c7a\u65b9\u6848\uff0c\u8003\u616e\u4f7f\u7528\u9999\u6e2fVPS<\/a>\u6216\u4e91\u670d\u52a1\u5668<\/a>\u4f86\u652f\u6301\u60a8\u7684\u6578\u64da\u5eab\u9700\u6c42\u3002\u7121\u8ad6\u662f\u5c0f\u578b\u9805\u76ee\u9084\u662f\u5927\u578b\u61c9\u7528\uff0c\u9078\u64c7\u5408\u9069\u7684\u4f3a\u670d\u5668\u90fd\u80fd\u5e6b\u52a9\u60a8\u66f4\u597d\u5730\u7ba1\u7406\u548c\u5206\u6790\u6578\u64da\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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