{"id":154555,"date":"2024-11-02T16:47:19","date_gmt":"2024-11-02T08:47:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/154555\/"},"modified":"2024-11-02T16:47:20","modified_gmt":"2024-11-02T08:47:20","slug":"%e5%b0%8d-oracle-10g-%e4%b8%ad-hints-%e8%aa%bf%e6%95%b4%e6%a9%9f%e5%88%b6%e8%a7%a3%e6%9e%90","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/154555\/","title":{"rendered":"\u5c0d Oracle 10g \u4e2d hints \u8abf\u6574\u6a5f\u5236\u89e3\u6790"},"content":{"rendered":"<h1 id=\"%e5%b0%8d-oracle-10g-%e4%b8%ad-hints-%e8%aa%bf%e6%95%b4%e6%a9%9f%e5%88%b6%e8%a7%a3%e6%9e%90-OazYCGPJBq\">\u5c0d Oracle 10g \u4e2d Hints \u8abf\u6574\u6a5f\u5236\u89e3\u6790<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u67e5\u8a62\u6027\u80fd\u7684\u512a\u5316\u662f\u6bcf\u4f4d\u8cc7\u6599\u5eab\u7ba1\u7406\u54e1\u548c\u958b\u767c\u8005\u7684\u91cd\u8981\u4efb\u52d9\u3002Oracle 10g \u63d0\u4f9b\u4e86\u4e00\u7a2e\u540d\u70ba\u300cHints\u300d\u7684\u6a5f\u5236\uff0c\u8b93\u4f7f\u7528\u8005\u80fd\u5920\u5c0d\u67e5\u8a62\u57f7\u884c\u8a08\u5283\u9032\u884c\u5fae\u8abf\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e Oracle 10g \u4e2d\u7684 Hints \u8abf\u6574\u6a5f\u5236\uff0c\u5e6b\u52a9\u8b80\u8005\u7406\u89e3\u5176\u904b\u4f5c\u539f\u7406\u53ca\u61c9\u7528\u5834\u666f\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af-hints%ef%bc%9f-OazYCGPJBq\">\u4ec0\u9ebc\u662f Hints\uff1f<\/h2>\n<p>Hints \u662f\u4e00\u7a2e\u7279\u6b8a\u7684\u6307\u4ee4\uff0c\u5d4c\u5165\u5728 SQL \u67e5\u8a62\u4e2d\uff0c\u6307\u5c0e Oracle \u512a\u5316\u5668\u9078\u64c7\u7279\u5b9a\u7684\u57f7\u884c\u8a08\u5283\u3002\u9019\u4e9b\u6307\u4ee4\u4e0d\u6703\u6539\u8b8a\u67e5\u8a62\u7684\u7d50\u679c\uff0c\u4f46\u53ef\u4ee5\u5f71\u97ff\u67e5\u8a62\u7684\u57f7\u884c\u6548\u7387\u3002\u4f7f\u7528 Hints \u7684\u4e3b\u8981\u76ee\u7684\u662f\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u512a\u5316\u5668\u53ef\u80fd\u7121\u6cd5\u9078\u64c7\u6700\u4f73\u7684\u57f7\u884c\u8a08\u5283\u6642\uff0c\u63d0\u4f9b\u984d\u5916\u7684\u6307\u5c0e\u3002<\/p>\n<h2 id=\"hints-%e7%9a%84%e9%a1%9e%e5%9e%8b-OazYCGPJBq\">Hints \u7684\u985e\u578b<\/h2>\n<p>Oracle 10g \u4e2d\u7684 Hints \u53ef\u4ee5\u5206\u70ba\u5e7e\u500b\u4e3b\u8981\u985e\u578b\uff1a<\/p>\n<ul>\n<li><strong>\u57f7\u884c\u8a08\u5283 Hints\uff1a<\/strong>\u9019\u4e9b Hints \u6307\u5c0e\u512a\u5316\u5668\u4f7f\u7528\u7279\u5b9a\u7684\u57f7\u884c\u8a08\u5283\u3002\u4f8b\u5982\uff0c<code>USE_NL<\/code> \u63d0\u793a\u512a\u5316\u5668\u4f7f\u7528\u5d4c\u5957\u8ff4\u5708\u9023\u63a5\u3002<\/li>\n<li><strong>\u8a2a\u554f\u65b9\u6cd5 Hints\uff1a<\/strong>\u9019\u4e9b Hints \u6307\u5c0e\u512a\u5316\u5668\u9078\u64c7\u7279\u5b9a\u7684\u8a2a\u554f\u65b9\u6cd5\uff0c\u5982\u5168\u8868\u6383\u63cf\u6216\u7d22\u5f15\u6383\u63cf\u3002\u4f8b\u5982\uff0c<code>FULL<\/code> \u63d0\u793a\u512a\u5316\u5668\u5c0d\u67d0\u500b\u8868\u9032\u884c\u5168\u8868\u6383\u63cf\u3002<\/li>\n<li><strong>\u9023\u63a5 Hints\uff1a<\/strong>\u9019\u4e9b Hints \u7528\u65bc\u63a7\u5236\u591a\u500b\u8868\u4e4b\u9593\u7684\u9023\u63a5\u65b9\u5f0f\u3002\u4f8b\u5982\uff0c<code>LEADING<\/code> \u63d0\u793a\u512a\u5316\u5668\u6309\u7167\u6307\u5b9a\u7684\u9806\u5e8f\u9032\u884c\u9023\u63a5\u3002<\/li>\n<li><strong>\u4e26\u884c Hints\uff1a<\/strong>\u9019\u4e9b Hints \u7528\u65bc\u6307\u5c0e\u512a\u5316\u5668\u4f7f\u7528\u4e26\u884c\u8655\u7406\u4f86\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u4f8b\u5982\uff0c<code>PARALLEL<\/code> \u63d0\u793a\u512a\u5316\u5668\u5728\u57f7\u884c\u67e5\u8a62\u6642\u4f7f\u7528\u4e26\u884c\u8655\u7406\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8-hints-OazYCGPJBq\">\u5982\u4f55\u4f7f\u7528 Hints<\/h2>\n<p>\u5728 SQL \u67e5\u8a62\u4e2d\u4f7f\u7528 Hints \u7684\u8a9e\u6cd5\u76f8\u5c0d\u7c21\u55ae\u3002Hints \u901a\u5e38\u653e\u7f6e\u5728 SQL \u8a9e\u53e5\u7684\u958b\u982d\uff0c\u4e26\u7528\u6ce8\u91cb\u7684\u5f62\u5f0f\u8868\u793a\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>\nSELECT \/*+ USE_NL(emp) *\/ *\nFROM employees emp, departments dept\nWHERE emp.department_id = dept.department_id;\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c<code>USE_NL(emp)<\/code> \u662f\u4e00\u500b Hint\uff0c\u6307\u793a\u512a\u5316\u5668\u4f7f\u7528\u5d4c\u5957\u8ff4\u5708\u9023\u63a5\u4f86\u8655\u7406\u67e5\u8a62\u3002<\/p>\n<h2 id=\"hints-%e7%9a%84%e5%84%aa%e7%bc%ba%e9%bb%9e-OazYCGPJBq\">Hints \u7684\u512a\u7f3a\u9ede<\/h2>\n<p>\u4f7f\u7528 Hints \u6709\u5176\u512a\u7f3a\u9ede\uff1a<\/p>\n<ul>\n<li><strong>\u512a\u9ede\uff1a<\/strong>\n<ul>\n<li>\u80fd\u5920\u6539\u5584\u67e5\u8a62\u6027\u80fd\uff0c\u7279\u5225\u662f\u5728\u512a\u5316\u5668\u7121\u6cd5\u81ea\u52d5\u9078\u64c7\u6700\u4f73\u8a08\u5283\u7684\u60c5\u6cc1\u4e0b\u3002<\/li>\n<li>\u63d0\u4f9b\u4e86\u5c0d\u67e5\u8a62\u57f7\u884c\u8a08\u5283\u7684\u66f4\u9ad8\u63a7\u5236\u6b0a\u3002<\/li>\n<\/ul>\n<\/li>\n<li><strong>\u7f3a\u9ede\uff1a<\/strong>\n<ul>\n<li>\u904e\u5ea6\u4f9d\u8cf4 Hints \u53ef\u80fd\u5c0e\u81f4\u67e5\u8a62\u7684\u53ef\u7dad\u8b77\u6027\u964d\u4f4e\uff0c\u56e0\u70ba\u672a\u4f86\u7684\u6578\u64da\u8b8a\u66f4\u53ef\u80fd\u5f71\u97ff Hints \u7684\u6709\u6548\u6027\u3002<\/li>\n<li>\u4e0d\u7576\u4f7f\u7528 Hints \u53ef\u80fd\u6703\u5c0e\u81f4\u6027\u80fd\u4e0b\u964d\uff0c\u800c\u4e0d\u662f\u63d0\u5347\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2 id=\"%e6%9c%80%e4%bd%b3%e5%af%a6%e8%b8%90-OazYCGPJBq\">\u6700\u4f73\u5be6\u8e10<\/h2>\n<p>\u5728\u4f7f\u7528 Hints \u6642\uff0c\u5efa\u8b70\u9075\u5faa\u4ee5\u4e0b\u6700\u4f73\u5be6\u8e10\uff1a<\/p>\n<ul>\n<li>\u5728\u4f7f\u7528 Hints \u524d\uff0c\u5148\u9032\u884c\u5145\u5206\u7684\u6027\u80fd\u6e2c\u8a66\uff0c\u78ba\u4fdd\u5176\u80fd\u5920\u5e36\u4f86\u5be6\u969b\u7684\u6027\u80fd\u63d0\u5347\u3002<\/li>\n<li>\u5b9a\u671f\u6aa2\u67e5\u548c\u66f4\u65b0 Hints\uff0c\u4ee5\u78ba\u4fdd\u5176\u5728\u6578\u64da\u8b8a\u66f4\u5f8c\u4ecd\u7136\u6709\u6548\u3002<\/li>\n<li>\u907f\u514d\u904e\u5ea6\u4f7f\u7528 Hints\uff0c\u61c9\u8a72\u512a\u5148\u8003\u616e\u512a\u5316\u67e5\u8a62\u7684\u7d50\u69cb\u548c\u7d22\u5f15\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-OazYCGPJBq\">\u7e3d\u7d50<\/h2>\n<p>Oracle 10g \u4e2d\u7684 Hints \u8abf\u6574\u6a5f\u5236\u70ba\u8cc7\u6599\u5eab\u7ba1\u7406\u54e1\u63d0\u4f9b\u4e86\u4e00\u7a2e\u5f37\u5927\u7684\u5de5\u5177\uff0c\u4ee5\u6539\u5584\u67e5\u8a62\u6027\u80fd\u3002\u900f\u904e\u6b63\u78ba\u7684\u4f7f\u7528 Hints\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u6307\u5c0e\u512a\u5316\u5668\u9078\u64c7\u6700\u4f73\u7684\u57f7\u884c\u8a08\u5283\u3002\u7136\u800c\uff0c\u4f7f\u7528 Hints \u4e5f\u9700\u8b39\u614e\uff0c\u4ee5\u907f\u514d\u5c0d\u67e5\u8a62\u6027\u80fd\u9020\u6210\u8ca0\u9762\u5f71\u97ff\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u80fd\u7684\u61c9\u7528\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4e5f\u662f\u81f3\u95dc\u91cd\u8981\u7684\uff0c\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u8cc7\u6599\u5eab\u7684\u7a69\u5b9a\u6027\u548c\u97ff\u61c9\u901f\u5ea6\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6df1\u5165\u89e3\u6790 Oracle 10g \u4e2d\u7684 hints \u8abf\u6574\u6a5f\u5236\uff0c\u63a2\u8a0e\u5176\u5c0d\u67e5\u8a62\u6027\u80fd\u512a\u5316\u7684\u5f71\u97ff\u8207\u61c9\u7528\u6280\u5de7\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-154555","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/154555","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=154555"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/154555\/revisions"}],"predecessor-version":[{"id":154556,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/154555\/revisions\/154556"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=154555"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=154555"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=154555"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}