{"id":166049,"date":"2024-11-05T15:21:22","date_gmt":"2024-11-05T07:21:22","guid":{"rendered":"https:\/\/server.hk\/cnblog\/166049\/"},"modified":"2024-11-05T15:21:23","modified_gmt":"2024-11-05T07:21:23","slug":"%e5%bf%ab%e9%80%9f%e4%ba%86%e8%a7%a3oracle%e5%93%88%e5%b8%8c%e9%80%a3%e6%8e%a5","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/166049\/","title":{"rendered":"\u5feb\u901f\u4e86\u89e3Oracle\u54c8\u5e0c\u9023\u63a5"},"content":{"rendered":"<h1 id=\"%e5%bf%ab%e9%80%9f%e4%ba%86%e8%a7%a3oracle%e5%93%88%e5%b8%8c%e9%80%a3%e6%8e%a5-YGDxGEXBDP\">\u5feb\u901f\u4e86\u89e3Oracle\u54c8\u5e0c\u9023\u63a5<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u9023\u63a5\u64cd\u4f5c\u662f\u67e5\u8a62\u6027\u80fd\u7684\u95dc\u9375\u56e0\u7d20\u4e4b\u4e00\u3002Oracle\u6578\u64da\u5eab\u63d0\u4f9b\u4e86\u591a\u7a2e\u9023\u63a5\u65b9\u6cd5\uff0c\u5176\u4e2d\u54c8\u5e0c\u9023\u63a5\uff08Hash 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id=\"%e5%84%aa%e9%bb%9e-YGDxGEXBDP\">\u512a\u9ede<\/h3>\n<ul>\n<li><strong>\u9ad8\u6548\u6027\uff1a<\/strong>\u5c0d\u65bc\u5927\u578b\u6578\u64da\u96c6\uff0c\u54c8\u5e0c\u9023\u63a5\u901a\u5e38\u6bd4\u5d4c\u5957\u5faa\u74b0\u9023\u63a5\uff08Nested Loop Join\uff09\u66f4\u5feb\uff0c\u56e0\u70ba\u5b83\u6e1b\u5c11\u4e86\u9700\u8981\u6bd4\u8f03\u7684\u884c\u6578\u3002<\/li>\n<li><strong>\u9069\u7528\u65bc\u7121\u7d22\u5f15\u7684\u60c5\u6cc1\uff1a<\/strong>\u7576\u9023\u63a5\u7684\u5217\u6c92\u6709\u7d22\u5f15\u6642\uff0c\u54c8\u5e0c\u9023\u63a5\u4ecd\u7136\u80fd\u5920\u63d0\u4f9b\u826f\u597d\u7684\u6027\u80fd\u3002<\/li>\n<\/ul>\n<h3 id=\"%e7%bc%ba%e9%bb%9e-YGDxGEXBDP\">\u7f3a\u9ede<\/h3>\n<ul>\n<li><strong>\u5167\u5b58\u6d88\u8017\uff1a<\/strong>\u54c8\u5e0c\u8868\u9700\u8981\u5728\u5167\u5b58\u4e2d\u5b58\u5132\uff0c\u5c0d\u65bc\u975e\u5e38\u5927\u7684\u6578\u64da\u96c6\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4\u5167\u5b58\u4e0d\u8db3\u7684\u554f\u984c\u3002<\/li>\n<li><strong>\u4e0d\u9069\u5408\u5c0f\u6578\u64da\u96c6\uff1a<\/strong>\u5c0d\u65bc\u5c0f\u578b\u6578\u64da\u96c6\uff0c\u54c8\u5e0c\u9023\u63a5\u7684\u958b\u92b7\u53ef\u80fd\u8d85\u904e\u5176\u5e36\u4f86\u7684\u6027\u80fd\u63d0\u5347\u3002<\/li>\n<\/ul>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e5%a0%b4%e6%99%af-YGDxGEXBDP\">\u4f7f\u7528\u5834\u666f<\/h2>\n<p>\u54c8\u5e0c\u9023\u63a5\u7279\u5225\u9069\u5408\u4ee5\u4e0b\u5e7e\u7a2e\u60c5\u6cc1\uff1a<\/p>\n<ul>\n<li>\u7576\u5169\u500b\u8868\u7684\u5927\u5c0f\u5dee\u7570\u8f03\u5927\u6642\uff0c\u9078\u64c7\u8f03\u5c0f\u7684\u8868\u4f5c\u70ba\u9a45\u52d5\u8868\u3002<\/li>\n<li>\u7576\u9023\u63a5\u7684\u5217\u6c92\u6709\u7d22\u5f15\uff0c\u4e14\u6578\u64da\u96c6\u8f03\u5927\u6642\uff0c\u54c8\u5e0c\u9023\u63a5\u80fd\u5920\u63d0\u4f9b\u66f4\u597d\u7684\u6027\u80fd\u3002<\/li>\n<li>\u5728\u9700\u8981\u9032\u884c\u591a\u6b21\u9023\u63a5\u64cd\u4f5c\u6642\uff0c\u54c8\u5e0c\u9023\u63a5\u53ef\u4ee5\u91cd\u8907\u4f7f\u7528\u54c8\u5e0c\u8868\uff0c\u9032\u4e00\u6b65\u63d0\u9ad8\u6548\u7387\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%a4%ba%e4%be%8b%e4%bb%a3%e7%a2%bc-YGDxGEXBDP\">\u793a\u4f8b\u4ee3\u78bc<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684SQL\u67e5\u8a62\u793a\u4f8b\uff0c\u5c55\u793a\u5982\u4f55\u4f7f\u7528\u54c8\u5e0c\u9023\u63a5\uff1a<\/p>\n<pre><code>\nSELECT a.*, b.*\nFROM table_a a\nJOIN table_b b ON a.id = b.a_id\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u67e5\u8a62\u4e2d\uff0cOracle\u6703\u6839\u64da\u6578\u64da\u7684\u5927\u5c0f\u81ea\u52d5\u9078\u64c7\u54c8\u5e0c\u9023\u63a5\u6216\u5176\u4ed6\u9023\u63a5\u65b9\u6cd5\u3002\u7528\u6236\u4e5f\u53ef\u4ee5\u901a\u904e\u63d0\u793a\uff08hints\uff09\u4f86\u5f37\u5236\u4f7f\u7528\u54c8\u5e0c\u9023\u63a5\uff0c\u4f8b\u5982\uff1a<\/p>\n<pre><code>\nSELECT \/*+ USE_HASH(a b) *\/ a.*, b.*\nFROM table_a a\nJOIN table_b b ON a.id = b.a_id\n<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-YGDxGEXBDP\">\u7e3d\u7d50<\/h2>\n<p>\u54c8\u5e0c\u9023\u63a5\u662f\u4e00\u7a2e\u9ad8\u6548\u7684\u6578\u64da\u5eab\u9023\u63a5\u6280\u8853\uff0c\u7279\u5225\u9069\u5408\u65bc\u8655\u7406\u5927\u578b\u6578\u64da\u96c6\u3002\u901a\u904e\u5408\u7406\u9078\u64c7\u9a45\u52d5\u8868\u548c\u7406\u89e3\u5176\u512a\u7f3a\u9ede\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u5728\u67e5\u8a62\u6027\u80fd\u4e0a\u7372\u5f97\u986f\u8457\u63d0\u5347\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u61c9\u7528\u5834\u666f\uff0c\u9078\u64c7\u5408\u9069\u7684\u9023\u63a5\u65b9\u6cd5\u81f3\u95dc\u91cd\u8981\u3002\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK 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