{"id":95050,"date":"2024-10-19T21:49:18","date_gmt":"2024-10-19T13:49:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/95050\/"},"modified":"2024-10-19T21:49:18","modified_gmt":"2024-10-19T13:49:18","slug":"oracle%e5%ad%98%e5%84%b2%e9%81%8e%e7%a8%8b%e4%b8%ad%e5%a6%82%e4%bd%95%e6%ad%a3%e7%a2%ba%e4%bd%bf%e7%94%a8%e8%a1%8c%e9%8e%96","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/95050\/","title":{"rendered":"Oracle\u5b58\u5132\u904e\u7a0b\u4e2d\u5982\u4f55\u6b63\u78ba\u4f7f\u7528\u884c\u9396"},"content":{"rendered":"<h1 id=\"oracle%e5%ad%98%e5%84%b2%e9%81%8e%e7%a8%8b%e4%b8%ad%e5%a6%82%e4%bd%95%e6%ad%a3%e7%a2%ba%e4%bd%bf%e7%94%a8%e8%a1%8c%e9%8e%96-mZhwaicLKA\">Oracle\u5b58\u5132\u904e\u7a0b\u4e2d\u5982\u4f55\u6b63\u78ba\u4f7f\u7528\u884c\u9396<\/h1>\n<p>\u5728Oracle\u6578\u64da\u5eab\u4e2d\uff0c\u884c\u9396\u662f\u4e00\u7a2e\u91cd\u8981\u7684\u9396\u5b9a\u6a5f\u5236\uff0c\u7528\u65bc\u4fdd\u8b77\u6578\u64da\u7684\u4e00\u81f4\u6027\u548c\u5b8c\u6574\u6027\u3002\u7576\u591a\u500b\u7528\u6236\u540c\u6642\u8a2a\u554f\u548c\u4fee\u6539\u6578\u64da\u6642\uff0c\u884c\u9396\u53ef\u4ee5\u9632\u6b62\u6578\u64da\u885d\u7a81\u548c\u4e0d\u4e00\u81f4\u7684\u60c5\u6cc1\u767c\u751f\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5728Oracle\u5b58\u5132\u904e\u7a0b\u4e2d\u5982\u4f55\u6b63\u78ba\u4f7f\u7528\u884c\u9396\uff0c\u4ee5\u78ba\u4fdd\u6578\u64da\u7684\u5b89\u5168\u6027\u548c\u6027\u80fd\u3002<\/p>\n<h2 id=\"%e8%a1%8c%e9%8e%96%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-mZhwaicLKA\">\u884c\u9396\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>\u884c\u9396\u662f\u6307\u5728\u6578\u64da\u5eab\u4e2d\u5c0d\u7279\u5b9a\u884c\u9032\u884c\u9396\u5b9a\u7684\u64cd\u4f5c\u3002\u8207\u8868\u9396\u4e0d\u540c\uff0c\u884c\u9396\u53ea\u5f71\u97ff\u88ab\u9396\u5b9a\u7684\u884c\uff0c\u9019\u6a23\u53ef\u4ee5\u63d0\u9ad8\u4e26\u767c\u6027\uff0c\u5141\u8a31\u591a\u500b\u7528\u6236\u540c\u6642\u8a2a\u554f\u4e0d\u540c\u7684\u884c\u3002\u884c\u9396\u7684\u4e3b\u8981\u985e\u578b\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>\u5171\u4eab\u9396\uff08Share Lock\uff09<\/strong>\uff1a\u5141\u8a31\u591a\u500b\u4e8b\u52d9\u540c\u6642\u8b80\u53d6\u88ab\u9396\u5b9a\u7684\u884c\uff0c\u4f46\u4e0d\u5141\u8a31\u4fee\u6539\u3002<\/li>\n<li><strong>\u6392\u4ed6\u9396\uff08Exclusive Lock\uff09<\/strong>\uff1a\u53ea\u5141\u8a31\u4e00\u500b\u4e8b\u52d9\u5c0d\u88ab\u9396\u5b9a\u7684\u884c\u9032\u884c\u8b80\u53d6\u548c\u4fee\u6539\uff0c\u5176\u4ed6\u4e8b\u52d9\u7121\u6cd5\u8a2a\u554f\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%9c%a8%e5%ad%98%e5%84%b2%e9%81%8e%e7%a8%8b%e4%b8%ad%e4%bd%bf%e7%94%a8%e8%a1%8c%e9%8e%96%e7%9a%84%e6%9c%80%e4%bd%b3%e5%af%a6%e8%b8%90-mZhwaicLKA\">\u5728\u5b58\u5132\u904e\u7a0b\u4e2d\u4f7f\u7528\u884c\u9396\u7684\u6700\u4f73\u5be6\u8e10<\/h2>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8%e9%81%a9%e7%95%b6%e7%9a%84%e9%8e%96%e5%ae%9a%e8%aa%9e%e5%8f%a5-mZhwaicLKA\">1. \u4f7f\u7528\u9069\u7576\u7684\u9396\u5b9a\u8a9e\u53e5<\/h3>\n<p>\u5728\u5b58\u5132\u904e\u7a0b\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528 <code>SELECT ... FOR UPDATE<\/code> \u8a9e\u53e5\u4f86\u7372\u53d6\u884c\u9396\u3002\u9019\u6a23\u53ef\u4ee5\u5728\u8b80\u53d6\u6578\u64da\u7684\u540c\u6642\u9396\u5b9a\u884c\uff0c\u9632\u6b62\u5176\u4ed6\u4e8b\u52d9\u4fee\u6539\u9019\u4e9b\u884c\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>DECLARE\n    v_emp_name VARCHAR2(100);\nBEGIN\n    SELECT emp_name INTO v_emp_name\n    FROM employees\n    WHERE emp_id = 100\n    FOR UPDATE;\n    \n    -- \u9032\u884c\u5176\u4ed6\u64cd\u4f5c\nEND;<\/code><\/pre>\n<h3 id=\"2-%e7%a2%ba%e4%bf%9d%e9%8e%96%e5%ae%9a%e7%af%84%e5%9c%8d%e6%9c%80%e5%b0%8f%e5%8c%96-mZhwaicLKA\">2. \u78ba\u4fdd\u9396\u5b9a\u7bc4\u570d\u6700\u5c0f\u5316<\/h3>\n<p>\u5728\u4f7f\u7528\u884c\u9396\u6642\uff0c\u61c9\u8a72\u76e1\u91cf\u7e2e\u5c0f\u9396\u5b9a\u7684\u7bc4\u570d\u3002\u9019\u610f\u5473\u8457\u53ea\u9396\u5b9a\u5fc5\u8981\u7684\u884c\uff0c\u4e26\u5728\u5b8c\u6210\u64cd\u4f5c\u5f8c\u7acb\u5373\u91cb\u653e\u9396\u3002\u9019\u6a23\u53ef\u4ee5\u6e1b\u5c11\u9396\u7af6\u722d\uff0c\u63d0\u9ad8\u7cfb\u7d71\u7684\u4e26\u767c\u6027\u80fd\u3002<\/p>\n<h3 id=\"3-%e9%81%bf%e5%85%8d%e6%ad%bb%e9%8e%96-mZhwaicLKA\">3. \u907f\u514d\u6b7b\u9396<\/h3>\n<p>\u6b7b\u9396\u662f\u6307\u5169\u500b\u6216\u591a\u500b\u4e8b\u52d9\u4e92\u76f8\u7b49\u5f85\u5c0d\u65b9\u91cb\u653e\u9396\uff0c\u5c0e\u81f4\u7cfb\u7d71\u7121\u6cd5\u7e7c\u7e8c\u57f7\u884c\u3002\u70ba\u4e86\u907f\u514d\u6b7b\u9396\uff0c\u53ef\u4ee5\u9075\u5faa\u4ee5\u4e0b\u5e7e\u500b\u539f\u5247\uff1a<\/p>\n<ul>\n<li>\u59cb\u7d42\u4ee5\u76f8\u540c\u7684\u9806\u5e8f\u7372\u53d6\u9396\u3002<\/li>\n<li>\u76e1\u91cf\u6e1b\u5c11\u6301\u6709\u9396\u7684\u6642\u9593\u3002<\/li>\n<li>\u4f7f\u7528 <code>SET LOCK_TIMEOUT<\/code> \u8a2d\u7f6e\u9396\u8d85\u6642\uff0c\u9632\u6b62\u9577\u6642\u9593\u7b49\u5f85\u3002<\/li>\n<\/ul>\n<h3 id=\"4-%e4%bd%bf%e7%94%a8%e9%81%a9%e7%95%b6%e7%9a%84%e9%9a%94%e9%9b%a2%e7%b4%9a%e5%88%a5-mZhwaicLKA\">4. \u4f7f\u7528\u9069\u7576\u7684\u9694\u96e2\u7d1a\u5225<\/h3>\n<p>Oracle\u652f\u6301\u591a\u7a2e\u4e8b\u52d9\u9694\u96e2\u7d1a\u5225\uff0c\u9078\u64c7\u5408\u9069\u7684\u9694\u96e2\u7d1a\u5225\u53ef\u4ee5\u5e6b\u52a9\u7ba1\u7406\u884c\u9396\u3002\u4f8b\u5982\uff0c\u4f7f\u7528 <code>READ COMMITTED<\/code> \u9694\u96e2\u7d1a\u5225\u53ef\u4ee5\u907f\u514d\u8b80\u53d6\u672a\u63d0\u4ea4\u7684\u6578\u64da\uff0c\u5f9e\u800c\u6e1b\u5c11\u9396\u7684\u9700\u6c42\u3002<\/p>\n<h2 id=\"%e8%a1%8c%e9%8e%96%e7%9a%84%e6%80%a7%e8%83%bd%e8%80%83%e9%87%8f-mZhwaicLKA\">\u884c\u9396\u7684\u6027\u80fd\u8003\u91cf<\/h2>\n<p>\u96d6\u7136\u884c\u9396\u53ef\u4ee5\u63d0\u9ad8\u4e26\u767c\u6027\uff0c\u4f46\u904e\u591a\u7684\u9396\u5b9a\u4e5f\u53ef\u80fd\u5c0e\u81f4\u6027\u80fd\u4e0b\u964d\u3002\u56e0\u6b64\uff0c\u5728\u8a2d\u8a08\u5b58\u5132\u904e\u7a0b\u6642\uff0c\u61c9\u8a72\u8003\u616e\u4ee5\u4e0b\u5e7e\u9ede\uff1a<\/p>\n<ul>\n<li>\u76e3\u63a7\u9396\u7684\u4f7f\u7528\u60c5\u6cc1\uff0c\u53ca\u6642\u8abf\u6574\u9396\u7b56\u7565\u3002<\/li>\n<li>\u4f7f\u7528\u7d22\u5f15\u4f86\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff0c\u6e1b\u5c11\u9396\u5b9a\u7684\u884c\u6578\u3002<\/li>\n<li>\u5b9a\u671f\u9032\u884c\u6027\u80fd\u6e2c\u8a66\uff0c\u78ba\u4fdd\u7cfb\u7d71\u5728\u9ad8\u8ca0\u8f09\u4e0b\u4ecd\u80fd\u6b63\u5e38\u904b\u884c\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-mZhwaicLKA\">\u7e3d\u7d50<\/h2>\n<p>\u5728Oracle\u5b58\u5132\u904e\u7a0b\u4e2d\u6b63\u78ba\u4f7f\u7528\u884c\u9396\u662f\u78ba\u4fdd\u6578\u64da\u4e00\u81f4\u6027\u548c\u7cfb\u7d71\u6027\u80fd\u7684\u95dc\u9375\u3002\u901a\u904e\u4f7f\u7528\u9069\u7576\u7684\u9396\u5b9a\u8a9e\u53e5\u3001\u7e2e\u5c0f\u9396\u5b9a\u7bc4\u570d\u3001\u907f\u514d\u6b7b\u9396\u4ee5\u53ca\u9078\u64c7\u5408\u9069\u7684\u9694\u96e2\u7d1a\u5225\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u7ba1\u7406\u884c\u9396\u7684\u4f7f\u7528\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u4e26\u767c\u7684\u61c9\u7528\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4e5f\u80fd\u63d0\u4f9b\u66f4\u597d\u7684\u6027\u80fd\u548c\u7a69\u5b9a\u6027\u3002\u4e86\u89e3\u884c\u9396\u7684\u904b\u4f5c\u539f\u7406\uff0c\u5c07\u6709\u52a9\u65bc\u958b\u767c\u4eba\u54e1\u5728\u8a2d\u8a08\u6578\u64da\u5eab\u61c9\u7528\u6642\u505a\u51fa\u66f4\u660e\u667a\u7684\u6c7a\u7b56\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3Oracle\u5b58\u5132\u904e\u7a0b\u4e2d\u884c\u9396\u7684\u6b63\u78ba\u4f7f\u7528\u65b9\u6cd5\uff0c\u63d0\u5347\u6578\u64da\u4e00\u81f4\u6027\u8207\u6027\u80fd\uff0c\u907f\u514d\u6b7b\u9396\u554f\u984c\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-95050","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95050","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=95050"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95050\/revisions"}],"predecessor-version":[{"id":95051,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95050\/revisions\/95051"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=95050"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=95050"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=95050"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}