{"id":152657,"date":"2024-11-02T00:56:19","date_gmt":"2024-11-01T16:56:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/152657\/"},"modified":"2024-11-02T00:56:20","modified_gmt":"2024-11-01T16:56:20","slug":"%e6%9f%a5%e8%a9%a2%e8%a8%98%e9%8c%84%e6%99%82%e7%b5%a6-oracle-%e8%a8%98%e9%8c%84%e5%8a%a0%e9%8e%96","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/152657\/","title":{"rendered":"\u67e5\u8a62\u8a18\u9304\u6642\u7d66 Oracle \u8a18\u9304\u52a0\u9396"},"content":{"rendered":"<h1 id=\"%e6%9f%a5%e8%a9%a2%e8%a8%98%e9%8c%84%e6%99%82%e7%b5%a6-oracle-%e8%a8%98%e9%8c%84%e5%8a%a0%e9%8e%96-MWvmJUbFMo\">\u67e5\u8a62\u8a18\u9304\u6642\u7d66 Oracle \u8a18\u9304\u52a0\u9396<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u4e2d\uff0c\u9396\u5b9a\u6a5f\u5236\u662f\u78ba\u4fdd\u6578\u64da\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\u7684\u91cd\u8981\u624b\u6bb5\u3002Oracle \u8cc7\u6599\u5eab\u63d0\u4f9b\u4e86\u591a\u7a2e\u9396\u5b9a\u6a5f\u5236\uff0c\u4ee5\u4fbf\u5728\u591a\u7528\u6236\u74b0\u5883\u4e2d\u6709\u6548\u5730\u7ba1\u7406\u6578\u64da\u8a2a\u554f\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5728\u67e5\u8a62\u8a18\u9304\u6642\u5982\u4f55\u7d66 Oracle \u8a18\u9304\u52a0\u9396\uff0c\u4e26\u4ecb\u7d39\u76f8\u95dc\u7684\u9396\u5b9a\u985e\u578b\u53ca\u5176\u4f7f\u7528\u60c5\u5883\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e9%8e%96%e5%ae%9a%ef%bc%9f-MWvmJUbFMo\">\u4ec0\u9ebc\u662f\u9396\u5b9a\uff1f<\/h2>\n<p>\u9396\u5b9a\u662f\u6307\u5728\u8cc7\u6599\u5eab\u4e2d\u5c0d\u7279\u5b9a\u6578\u64da\u9032\u884c\u4fdd\u8b77\uff0c\u4ee5\u9632\u6b62\u5176\u4ed6\u7528\u6236\u5728\u672a\u7d93\u6388\u6b0a\u7684\u60c5\u6cc1\u4e0b\u9032\u884c\u4fee\u6539\u3002\u9019\u5c0d\u65bc\u4fdd\u6301\u6578\u64da\u7684\u4e00\u81f4\u6027\u81f3\u95dc\u91cd\u8981\uff0c\u7279\u5225\u662f\u5728\u591a\u7528\u6236\u74b0\u5883\u4e2d\u3002Oracle \u63d0\u4f9b\u4e86\u884c\u7d1a\u9396\u548c\u8868\u7d1a\u9396\u7b49\u591a\u7a2e\u9396\u5b9a\u65b9\u5f0f\u3002<\/p>\n<h2 id=\"oracle-%e9%8e%96%e5%ae%9a%e9%a1%9e%e5%9e%8b-MWvmJUbFMo\">Oracle \u9396\u5b9a\u985e\u578b<\/h2>\n<ul>\n<li><strong>\u884c\u7d1a\u9396\uff08Row-level Lock\uff09<\/strong>: \u9019\u7a2e\u9396\u5b9a\u53ea\u5f71\u97ff\u7279\u5b9a\u7684\u884c\uff0c\u5141\u8a31\u5176\u4ed6\u7528\u6236\u8a2a\u554f\u540c\u4e00\u8868\u4e2d\u7684\u5176\u4ed6\u884c\u3002\u884c\u7d1a\u9396\u901a\u5e38\u7528\u65bc\u9ad8\u4f75\u767c\u7684\u74b0\u5883\u4e2d\u3002<\/li>\n<li><strong>\u8868\u7d1a\u9396\uff08Table-level Lock\uff09<\/strong>: \u9019\u7a2e\u9396\u5b9a\u6703\u9396\u4f4f\u6574\u500b\u8868\uff0c\u9632\u6b62\u5176\u4ed6\u7528\u6236\u5c0d\u8a72\u8868\u9032\u884c\u4efb\u4f55\u64cd\u4f5c\u3002\u8868\u7d1a\u9396\u9069\u7528\u65bc\u9700\u8981\u5c0d\u6574\u500b\u8868\u9032\u884c\u6279\u91cf\u64cd\u4f5c\u7684\u60c5\u6cc1\u3002<\/li>\n<li><strong>\u5171\u4eab\u9396\uff08Shared Lock\uff09<\/strong>: \u5141\u8a31\u591a\u500b\u7528\u6236\u540c\u6642\u8b80\u53d6\u6578\u64da\uff0c\u4f46\u4e0d\u5141\u8a31\u4fee\u6539\u3002\u9019\u5c0d\u65bc\u67e5\u8a62\u64cd\u4f5c\u975e\u5e38\u6709\u7528\u3002<\/li>\n<li><strong>\u6392\u4ed6\u9396\uff08Exclusive Lock\uff09<\/strong>: \u53ea\u5141\u8a31\u4e00\u500b\u7528\u6236\u5c0d\u6578\u64da\u9032\u884c\u8b80\u53d6\u548c\u5beb\u5165\uff0c\u5176\u4ed6\u7528\u6236\u7121\u6cd5\u8a2a\u554f\u88ab\u9396\u5b9a\u7684\u6578\u64da\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e5%9c%a8%e6%9f%a5%e8%a9%a2%e6%99%82%e5%8a%a0%e9%8e%96-MWvmJUbFMo\">\u5982\u4f55\u5728\u67e5\u8a62\u6642\u52a0\u9396<\/h2>\n<p>\u5728 Oracle \u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>SELECT ... FOR UPDATE<\/code> \u8a9e\u53e5\u4f86\u5c0d\u67e5\u8a62\u7684\u8a18\u9304\u52a0\u9396\u3002\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u5728\u67e5\u8a62\u671f\u9593\uff0c\u5176\u4ed6\u7528\u6236\u7121\u6cd5\u4fee\u6539\u9019\u4e9b\u8a18\u9304\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n<pre><code>SELECT * FROM employees WHERE department_id = 10 FOR UPDATE;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u67e5\u8a62\u5c07\u9396\u5b9a\u6240\u6709\u90e8\u9580 ID \u70ba 10 \u7684\u54e1\u5de5\u8a18\u9304\u3002\u9019\u610f\u5473\u8457\u5728\u7576\u524d\u4e8b\u52d9\u5b8c\u6210\u4e4b\u524d\uff0c\u5176\u4ed6\u7528\u6236\u7121\u6cd5\u5c0d\u9019\u4e9b\u8a18\u9304\u9032\u884c\u66f4\u65b0\u6216\u522a\u9664\u64cd\u4f5c\u3002<\/p>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e9%8e%96%e5%ae%9a%e7%9a%84%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-MWvmJUbFMo\">\u4f7f\u7528\u9396\u5b9a\u7684\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u96d6\u7136\u9396\u5b9a\u53ef\u4ee5\u4fdd\u8b77\u6578\u64da\u7684\u4e00\u81f4\u6027\uff0c\u4f46\u4e0d\u7576\u4f7f\u7528\u53ef\u80fd\u6703\u5c0e\u81f4\u6027\u80fd\u554f\u984c\u3002\u4f8b\u5982\uff0c\u9577\u6642\u9593\u6301\u6709\u9396\u5b9a\u53ef\u80fd\u6703\u5c0e\u81f4\u6b7b\u9396\u6216\u963b\u585e\u3002\u56e0\u6b64\uff0c\u5efa\u8b70\u9075\u5faa\u4ee5\u4e0b\u6700\u4f73\u5be6\u8e10\uff1a<\/p>\n<ul>\n<li>\u76e1\u91cf\u7e2e\u77ed\u9396\u5b9a\u7684\u6301\u6709\u6642\u9593\uff0c\u907f\u514d\u9577\u6642\u9593\u4f54\u7528\u9396\u3002<\/li>\n<li>\u5728\u4e8b\u52d9\u4e2d\u76e1\u65e9\u91cb\u653e\u9396\u5b9a\uff0c\u78ba\u4fdd\u5176\u4ed6\u7528\u6236\u80fd\u5920\u8a2a\u554f\u6578\u64da\u3002<\/li>\n<li>\u4f7f\u7528\u9069\u7576\u7684\u9396\u5b9a\u985e\u578b\uff0c\u6839\u64da\u5177\u9ad4\u9700\u6c42\u9078\u64c7\u884c\u7d1a\u9396\u6216\u8868\u7d1a\u9396\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-MWvmJUbFMo\">\u7d50\u8ad6<\/h2>\n<p>\u5728 Oracle \u8cc7\u6599\u5eab\u4e2d\uff0c\u67e5\u8a62\u8a18\u9304\u6642\u52a0\u9396\u662f\u4e00\u500b\u91cd\u8981\u7684\u64cd\u4f5c\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u4fdd\u8b77\u6578\u64da\u7684\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\u3002\u901a\u904e\u5408\u7406\u4f7f\u7528\u9396\u5b9a\u6a5f\u5236\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u5728\u591a\u7528\u6236\u74b0\u5883\u4e2d\u78ba\u4fdd\u6578\u64da\u7684\u5b89\u5168\u6027\u3002\u7136\u800c\uff0c\u5fc5\u9808\u8b39\u614e\u4f7f\u7528\u9396\u5b9a\uff0c\u4ee5\u907f\u514d\u6027\u80fd\u554f\u984c\u548c\u6b7b\u9396\u60c5\u6cc1\u7684\u767c\u751f\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u5982\u4f55\u5728 Oracle \u4e2d\u6709\u6548\u7ba1\u7406\u9396\u5b9a\u6709\u9032\u4e00\u6b65\u7684\u8208\u8da3\uff0c\u6216\u662f\u9700\u8981\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u652f\u6301\u60a8\u7684\u8cc7\u6599\u5eab\u61c9\u7528\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4e86\u89e3\u66f4\u591a\u8cc7\u8a0a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u67e5\u8a62\u8a18\u9304\u6642\uff0c\u70ba Oracle \u8a18\u9304\u52a0\u9396\u4ee5\u78ba\u4fdd\u6578\u64da\u4e00\u81f4\u6027\u548c\u5b89\u5168\u6027\uff0c\u9632\u6b62\u540c\u6642\u8a2a\u554f\u5c0e\u81f4\u7684\u885d\u7a81\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-152657","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/152657","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=152657"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/152657\/revisions"}],"predecessor-version":[{"id":152658,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/152657\/revisions\/152658"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=152657"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=152657"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=152657"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}