{"id":156617,"date":"2024-11-02T20:45:26","date_gmt":"2024-11-02T12:45:26","guid":{"rendered":"https:\/\/server.hk\/cnblog\/156617\/"},"modified":"2024-11-02T20:45:27","modified_gmt":"2024-11-02T12:45:27","slug":"%e5%88%86%e6%9e%90-oracle-%e7%b4%a2%e5%bc%95%e6%8e%83%e6%8f%8f%e5%9b%9b%e5%a4%a7%e9%a1%9e","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/156617\/","title":{"rendered":"\u5206\u6790 Oracle \u7d22\u5f15\u6383\u63cf\u56db\u5927\u985e"},"content":{"rendered":"<h1 id=\"%e5%88%86%e6%9e%90-oracle-%e7%b4%a2%e5%bc%95%e6%8e%83%e6%8f%8f%e5%9b%9b%e5%a4%a7%e9%a1%9e-CHqciLtawb\">\u5206\u6790 Oracle \u7d22\u5f15\u6383\u63cf\u56db\u5927\u985e<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u7d22\u5f15\u662f\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u7684\u91cd\u8981\u5de5\u5177\u3002Oracle \u6578\u64da\u5eab\u63d0\u4f9b\u4e86\u591a\u7a2e\u7d22\u5f15\u6383\u63cf\u7684\u65b9\u5f0f\uff0c\u9019\u4e9b\u65b9\u5f0f\u6839\u64da\u67e5\u8a62\u7684\u9700\u6c42\u548c\u6578\u64da\u7684\u7d50\u69cb\u800c\u6709\u6240\u4e0d\u540c\u3002\u672c\u6587\u5c07\u5206\u6790 Oracle \u7d22\u5f15\u6383\u63cf\u7684\u56db\u5927\u985e\uff0c\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u7406\u89e3\u5176\u904b\u4f5c\u539f\u7406\u53ca\u61c9\u7528\u5834\u666f\u3002<\/p>\n<h2 id=\"1-%e5%85%a8%e8%a1%a8%e6%8e%83%e6%8f%8f%ef%bc%88full-table-scan%ef%bc%89-CHqciLtawb\">1. \u5168\u8868\u6383\u63cf\uff08Full Table Scan\uff09<\/h2>\n<p>\u5168\u8868\u6383\u63cf\u662f\u6307\u5728\u67e5\u8a62\u6642\uff0c\u6578\u64da\u5eab\u7cfb\u7d71\u6703\u6aa2\u67e5\u8868\u4e2d\u7684\u6bcf\u4e00\u884c\u6578\u64da\u3002\u9019\u7a2e\u6383\u63cf\u65b9\u5f0f\u901a\u5e38\u5728\u4ee5\u4e0b\u60c5\u6cc1\u4e0b\u767c\u751f\uff1a<\/p>\n<ul>\n<li>\u8868\u4e2d\u6c92\u6709\u7d22\u5f15\u3002<\/li>\n<li>\u67e5\u8a62\u7684\u689d\u4ef6\u4e0d\u9069\u5408\u4f7f\u7528\u7d22\u5f15\u3002<\/li>\n<li>\u67e5\u8a62\u8fd4\u56de\u7684\u6578\u64da\u91cf\u975e\u5e38\u5927\uff0c\u4f7f\u7528\u7d22\u5f15\u53cd\u800c\u6703\u589e\u52a0\u984d\u5916\u7684\u958b\u92b7\u3002<\/li>\n<\/ul>\n<p>\u5168\u8868\u6383\u63cf\u7684\u512a\u9ede\u662f\u7c21\u55ae\u76f4\u63a5\uff0c\u4f46\u7f3a\u9ede\u662f\u6548\u7387\u4f4e\u4e0b\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u578b\u6578\u64da\u96c6\u6642\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u5168\u8868\u6383\u63cf\u7684 SQL \u67e5\u8a62\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>SELECT * FROM employees;<\/code><\/pre>\n<h2 id=\"2-%e7%b4%a2%e5%bc%95%e7%af%84%e5%9c%8d%e6%8e%83%e6%8f%8f%ef%bc%88index-range-scan%ef%bc%89-CHqciLtawb\">2. \u7d22\u5f15\u7bc4\u570d\u6383\u63cf\uff08Index Range Scan\uff09<\/h2>\n<p>\u7d22\u5f15\u7bc4\u570d\u6383\u63cf\u662f\u6307\u6578\u64da\u5eab\u7cfb\u7d71\u6839\u64da\u7d22\u5f15\u7684\u9806\u5e8f\u4f86\u6aa2\u7d22\u6578\u64da\u3002\u9019\u7a2e\u6383\u63cf\u65b9\u5f0f\u9069\u7528\u65bc\u67e5\u8a62\u689d\u4ef6\u4e2d\u5305\u542b\u7bc4\u570d\u67e5\u8a62\u7684\u60c5\u6cc1\uff0c\u4f8b\u5982\u4f7f\u7528\u5927\u65bc\u3001\u5c0f\u65bc\u7b49\u904b\u7b97\u7b26\u3002\u7d22\u5f15\u7bc4\u570d\u6383\u63cf\u7684\u512a\u9ede\u5728\u65bc\u80fd\u5920\u6709\u6548\u5730\u5229\u7528\u7d22\u5f15\uff0c\u5f9e\u800c\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002<\/p>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528\u7d22\u5f15\u7bc4\u570d\u6383\u63cf\u7684 SQL \u67e5\u8a62\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>SELECT * FROM employees WHERE salary BETWEEN 50000 AND 100000;<\/code><\/pre>\n<h2 id=\"3-%e5%94%af%e4%b8%80%e7%b4%a2%e5%bc%95%e6%8e%83%e6%8f%8f%ef%bc%88unique-index-scan%ef%bc%89-CHqciLtawb\">3. \u552f\u4e00\u7d22\u5f15\u6383\u63cf\uff08Unique Index Scan\uff09<\/h2>\n<p>\u552f\u4e00\u7d22\u5f15\u6383\u63cf\u662f\u6307\u6578\u64da\u5eab\u7cfb\u7d71\u4f7f\u7528\u552f\u4e00\u7d22\u5f15\u4f86\u67e5\u627e\u7279\u5b9a\u7684\u884c\u3002\u7531\u65bc\u552f\u4e00\u7d22\u5f15\u4fdd\u8b49\u4e86\u7d22\u5f15\u9375\u7684\u552f\u4e00\u6027\uff0c\u56e0\u6b64\u5728\u67e5\u8a62\u6642\uff0c\u6578\u64da\u5eab\u53ea\u9700\u6aa2\u7d22\u4e00\u884c\u6578\u64da\u3002\u9019\u7a2e\u6383\u63cf\u65b9\u5f0f\u7684\u6548\u7387\u975e\u5e38\u9ad8\uff0c\u7279\u5225\u662f\u5728\u67e5\u8a62\u689d\u4ef6\u4e2d\u4f7f\u7528\u4e86\u4e3b\u9375\u6216\u552f\u4e00\u7d04\u675f\u7684\u60c5\u6cc1\u4e0b\u3002<\/p>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528\u552f\u4e00\u7d22\u5f15\u6383\u63cf\u7684 SQL \u67e5\u8a62\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>SELECT * FROM employees WHERE employee_id = 101;<\/code><\/pre>\n<h2 id=\"4-%e7%b4%a2%e5%bc%95%e5%85%a8%e6%8e%83%e6%8f%8f%ef%bc%88index-full-scan%ef%bc%89-CHqciLtawb\">4. \u7d22\u5f15\u5168\u6383\u63cf\uff08Index Full Scan\uff09<\/h2>\n<p>\u7d22\u5f15\u5168\u6383\u63cf\u662f\u6307\u6578\u64da\u5eab\u7cfb\u7d71\u6383\u63cf\u6574\u500b\u7d22\u5f15\uff0c\u800c\u4e0d\u662f\u6574\u500b\u8868\u3002\u9019\u7a2e\u65b9\u5f0f\u901a\u5e38\u5728\u67e5\u8a62\u9700\u8981\u8fd4\u56de\u5927\u91cf\u6578\u64da\u6642\u4f7f\u7528\uff0c\u7279\u5225\u662f\u7576\u67e5\u8a62\u689d\u4ef6\u4e0d\u5920\u5177\u9ad4\uff0c\u7121\u6cd5\u4f7f\u7528\u7bc4\u570d\u6383\u63cf\u6216\u552f\u4e00\u6383\u63cf\u6642\u3002\u7d22\u5f15\u5168\u6383\u63cf\u7684\u6548\u7387\u901a\u5e38\u9ad8\u65bc\u5168\u8868\u6383\u63cf\uff0c\u4f46\u4ecd\u7136\u4f4e\u65bc\u5176\u4ed6\u985e\u578b\u7684\u7d22\u5f15\u6383\u63cf\u3002<\/p>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528\u7d22\u5f15\u5168\u6383\u63cf\u7684 SQL \u67e5\u8a62\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>SELECT * FROM employees WHERE department_id IN (10, 20, 30);<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-CHqciLtawb\">\u7e3d\u7d50<\/h2>\n<p>\u4e86\u89e3 Oracle \u7684\u7d22\u5f15\u6383\u63cf\u985e\u578b\u5c0d\u65bc\u512a\u5316\u67e5\u8a62\u6027\u80fd\u81f3\u95dc\u91cd\u8981\u3002\u5168\u8868\u6383\u63cf\u3001\u7d22\u5f15\u7bc4\u570d\u6383\u63cf\u3001\u552f\u4e00\u7d22\u5f15\u6383\u63cf\u548c\u7d22\u5f15\u5168\u6383\u63cf\u5404\u6709\u5176\u9069\u7528\u5834\u666f\uff0c\u9078\u64c7\u5408\u9069\u7684\u7d22\u5f15\u6383\u63cf\u65b9\u5f0f\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u6578\u64da\u6aa2\u7d22\u7684\u6548\u7387\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u4f01\u696d\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4e5f\u662f\u4e00\u500b\u91cd\u8981\u8003\u91cf\uff0c\u7279\u5225\u662f\u5728\u9999\u6e2f\u9019\u6a23\u7684\u5e02\u5834\u4e2d\uff0c\u63d0\u4f9b\u7a69\u5b9a\u548c\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u5c07\u6709\u52a9\u65bc\u63d0\u5347\u696d\u52d9\u904b\u71df\u7684\u6574\u9ad4\u6548\u7387\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6df1\u5165\u5206\u6790 Oracle \u7d22\u5f15\u6383\u63cf\u7684\u56db\u5927\u985e\u578b\uff0c\u4e86\u89e3\u5176\u7279\u9ede\u8207\u61c9\u7528\uff0c\u63d0\u5347\u6578\u64da\u67e5\u8a62\u6548\u7387\u8207\u6027\u80fd\u512a\u5316\u7b56\u7565\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-156617","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/156617","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=156617"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/156617\/revisions"}],"predecessor-version":[{"id":156618,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/156617\/revisions\/156618"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=156617"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=156617"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=156617"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}