{"id":172135,"date":"2024-11-07T10:36:19","date_gmt":"2024-11-07T02:36:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/172135\/"},"modified":"2024-11-07T10:36:20","modified_gmt":"2024-11-07T02:36:20","slug":"%e5%85%a8%e9%9d%a2%e8%ac%9b%e8%a7%a3oracle%e9%8e%96%e5%ad%98%e5%99%a8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/172135\/","title":{"rendered":"\u5168\u9762\u8b1b\u89e3Oracle\u9396\u5b58\u5668"},"content":{"rendered":"<h1 id=\"%e5%85%a8%e9%9d%a2%e8%ac%9b%e8%a7%a3oracle%e9%8e%96%e5%ad%98%e5%99%a8-KFtGDuiguA\">\u5168\u9762\u8b1b\u89e3Oracle\u9396\u5b58\u5668<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u9396\u5b58\u5668\uff08Latch\uff09\u662f\u4e00\u7a2e\u8f15\u91cf\u7d1a\u7684\u540c\u6b65\u6a5f\u5236\uff0c\u4e3b\u8981\u7528\u65bc\u4fdd\u8b77\u5171\u4eab\u8cc7\u6e90\u7684\u8a2a\u554f\u3002Oracle\u6578\u64da\u5eab\u4e2d\uff0c\u9396\u5b58\u5668\u7684\u4f7f\u7528\u81f3\u95dc\u91cd\u8981\uff0c\u56e0\u70ba\u5b83\u5011\u80fd\u5920\u63d0\u9ad8\u6027\u80fd\u4e26\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\u3002\u672c\u6587\u5c07\u5168\u9762\u63a2\u8a0eOracle\u9396\u5b58\u5668\u7684\u6982\u5ff5\u3001\u985e\u578b\u3001\u5de5\u4f5c\u539f\u7406\u53ca\u5176\u5728\u6578\u64da\u5eab\u4e2d\u7684\u61c9\u7528\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e9%8e%96%e5%ad%98%e5%99%a8%ef%bc%9f-KFtGDuiguA\">\u4ec0\u9ebc\u662f\u9396\u5b58\u5668\uff1f<\/h2>\n<p>\u9396\u5b58\u5668\u662f\u4e00\u7a2e\u7528\u65bc\u4fdd\u8b77\u5167\u5b58\u7d50\u69cb\u7684\u540c\u6b65\u6a5f\u5236\uff0c\u901a\u5e38\u7528\u65bc\u591a\u7dda\u7a0b\u74b0\u5883\u4e2d\u3002\u8207\u50b3\u7d71\u7684\u9396\u76f8\u6bd4\uff0c\u9396\u5b58\u5668\u7684\u958b\u92b7\u66f4\u5c0f\uff0c\u56e0\u70ba\u5b83\u5011\u4e0d\u9700\u8981\u9032\u884c\u4e0a\u4e0b\u6587\u5207\u63db\u3002Oracle\u6578\u64da\u5eab\u4e2d\uff0c\u9396\u5b58\u5668\u4e3b\u8981\u7528\u65bc\u4fdd\u8b77\u5167\u90e8\u6578\u64da\u7d50\u69cb\uff0c\u5982\u7de9\u885d\u5340\u7de9\u5b58\u3001\u5171\u4eab\u6c60\u7b49\u3002<\/p>\n<h2 id=\"oracle%e9%8e%96%e5%ad%98%e5%99%a8%e7%9a%84%e9%a1%9e%e5%9e%8b-KFtGDuiguA\">Oracle\u9396\u5b58\u5668\u7684\u985e\u578b<\/h2>\n<p>Oracle\u4e2d\u6709\u591a\u7a2e\u9396\u5b58\u5668\uff0c\u4e3b\u8981\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>\u8f15\u91cf\u7d1a\u9396\u5b58\u5668\uff08Lightweight Latch\uff09<\/strong>\uff1a\u9019\u662f\u6700\u5e38\u898b\u7684\u9396\u5b58\u5668\u985e\u578b\uff0c\u4e3b\u8981\u7528\u65bc\u4fdd\u8b77\u5c0f\u578b\u6578\u64da\u7d50\u69cb\u3002\u5b83\u5011\u7684\u958b\u92b7\u975e\u5e38\u5c0f\uff0c\u9069\u5408\u9ad8\u983b\u7387\u7684\u8a2a\u554f\u3002<\/li>\n<li><strong>\u5168\u5c40\u9396\u5b58\u5668\uff08Global Latch\uff09<\/strong>\uff1a\u9019\u7a2e\u9396\u5b58\u5668\u7528\u65bc\u4fdd\u8b77\u5168\u5c40\u8cc7\u6e90\uff0c\u901a\u5e38\u5728\u591a\u500b\u5be6\u4f8b\u4e4b\u9593\u5171\u4eab\u3002<\/li>\n<li><strong>\u7de9\u885d\u5340\u9396\u5b58\u5668\uff08Buffer Latch\uff09<\/strong>\uff1a\u5c08\u9580\u7528\u65bc\u4fdd\u8b77\u7de9\u885d\u5340\u7de9\u5b58\u4e2d\u7684\u6578\u64da\u584a\uff0c\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\u3002<\/li>\n<\/ul>\n<h2 id=\"%e9%8e%96%e5%ad%98%e5%99%a8%e7%9a%84%e5%b7%a5%e4%bd%9c%e5%8e%9f%e7%90%86-KFtGDuiguA\">\u9396\u5b58\u5668\u7684\u5de5\u4f5c\u539f\u7406<\/h2>\n<p>\u9396\u5b58\u5668\u7684\u5de5\u4f5c\u539f\u7406\u76f8\u5c0d\u7c21\u55ae\u3002\u7576\u4e00\u500b\u7dda\u7a0b\u9700\u8981\u8a2a\u554f\u67d0\u500b\u5171\u4eab\u8cc7\u6e90\u6642\uff0c\u5b83\u6703\u9996\u5148\u6aa2\u67e5\u8a72\u8cc7\u6e90\u662f\u5426\u88ab\u5176\u4ed6\u7dda\u7a0b\u9396\u5b9a\u3002\u5982\u679c\u6c92\u6709\u9396\u5b9a\uff0c\u8a72\u7dda\u7a0b\u5c07\u7372\u5f97\u9396\u5b58\u5668\u7684\u63a7\u5236\u6b0a\uff0c\u4e26\u53ef\u4ee5\u5b89\u5168\u5730\u8a2a\u554f\u8a72\u8cc7\u6e90\u3002\u5982\u679c\u8cc7\u6e90\u5df2\u88ab\u9396\u5b9a\uff0c\u8a72\u7dda\u7a0b\u5c07\u9032\u5165\u7b49\u5f85\u72c0\u614b\uff0c\u76f4\u5230\u9396\u5b58\u5668\u88ab\u91cb\u653e\u3002<\/p>\n<p>\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u793a\u4f8b\uff0c\u5c55\u793a\u4e86\u5982\u4f55\u5728PL\/SQL\u4e2d\u4f7f\u7528\u9396\u5b58\u5668\uff1a<\/p>\n<pre><code>\nDECLARE\n    l_latch_name VARCHAR2(30) := 'my_latch';\n    l_latch_handle INTEGER;\nBEGIN\n    -- \u7372\u53d6\u9396\u5b58\u5668\n    DBMS_LATCH.ALLOCATE(l_latch_name, l_latch_handle);\n    \n    -- \u7372\u53d6\u9396\u5b58\u5668\n    DBMS_LATCH.REQUEST(l_latch_handle, DBMS_LATCH.X_MODE);\n    \n    -- \u57f7\u884c\u9700\u8981\u4fdd\u8b77\u7684\u64cd\u4f5c\n    -- ...\n    \n    -- \u91cb\u653e\u9396\u5b58\u5668\n    DBMS_LATCH.RELEASE(l_latch_handle);\n    \n    -- \u91cb\u653e\u9396\u5b58\u5668\n    DBMS_LATCH.FREE(l_latch_handle);\nEND;\n<\/code><\/pre>\n<h2 id=\"%e9%8e%96%e5%ad%98%e5%99%a8%e7%9a%84%e6%80%a7%e8%83%bd%e5%bd%b1%e9%9f%bf-KFtGDuiguA\">\u9396\u5b58\u5668\u7684\u6027\u80fd\u5f71\u97ff<\/h2>\n<p>\u96d6\u7136\u9396\u5b58\u5668\u7684\u958b\u92b7\u76f8\u5c0d\u8f03\u5c0f\uff0c\u4f46\u5728\u9ad8\u4e26\u767c\u74b0\u5883\u4e2d\uff0c\u9396\u5b58\u5668\u7684\u7af6\u722d\u53ef\u80fd\u6703\u5c0e\u81f4\u6027\u80fd\u74f6\u9838\u3002\u7576\u591a\u500b\u7dda\u7a0b\u540c\u6642\u8acb\u6c42\u540c\u4e00\u500b\u9396\u5b58\u5668\u6642\uff0c\u6703\u51fa\u73fe\u7b49\u5f85\u60c5\u6cc1\uff0c\u9019\u53ef\u80fd\u6703\u5f71\u97ff\u6574\u9ad4\u6027\u80fd\u3002\u56e0\u6b64\uff0c\u5408\u7406\u8a2d\u8a08\u6578\u64da\u7d50\u69cb\u548c\u9396\u5b58\u5668\u7684\u4f7f\u7528\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002<\/p>\n<h2 id=\"%e5%a6%82%e4%bd%95%e7%9b%a3%e6%8e%a7%e9%8e%96%e5%ad%98%e5%99%a8-KFtGDuiguA\">\u5982\u4f55\u76e3\u63a7\u9396\u5b58\u5668<\/h2>\n<p>Oracle\u63d0\u4f9b\u4e86\u4e00\u4e9b\u5de5\u5177\u4f86\u76e3\u63a7\u9396\u5b58\u5668\u7684\u4f7f\u7528\u60c5\u6cc1\u3002DBA\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\u4f86\u6aa2\u67e5\u9396\u5b58\u5668\u7684\u7af6\u722d\u60c5\u6cc1\uff1a<\/p>\n<pre><code>\nSELECT * FROM V$LATCH;\n<\/code><\/pre>\n<p>\u9019\u500b\u8996\u5716\u63d0\u4f9b\u4e86\u6709\u95dc\u9396\u5b58\u5668\u7684\u8a73\u7d30\u4fe1\u606f\uff0c\u5305\u62ec\u7576\u524d\u7684\u7af6\u722d\u6b21\u6578\u548c\u7b49\u5f85\u6642\u9593\u7b49\u6307\u6a19\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-KFtGDuiguA\">\u7d50\u8ad6<\/h2>\n<p>Oracle\u9396\u5b58\u5668\u5728\u6578\u64da\u5eab\u7684\u6027\u80fd\u548c\u6578\u64da\u4e00\u81f4\u6027\u4e2d\u626e\u6f14\u8457\u91cd\u8981\u89d2\u8272\u3002\u4e86\u89e3\u9396\u5b58\u5668\u7684\u985e\u578b\u3001\u5de5\u4f5c\u539f\u7406\u53ca\u5176\u6027\u80fd\u5f71\u97ff\uff0c\u5c0d\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u4f86\u8aaa\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u901a\u904e\u5408\u7406\u4f7f\u7528\u9396\u5b58\u5668\uff0c\u53ef\u4ee5\u6709\u6548\u63d0\u9ad8\u6578\u64da\u5eab\u7684\u6027\u80fd\uff0c\u78ba\u4fdd\u7cfb\u7d71\u7684\u7a69\u5b9a\u904b\u884c\u3002<\/p>\n<p>\u5982\u9700\u4e86\u89e3\u66f4\u591a\u6709\u95dc <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u548c <a href=\"https:\/\/server.hk\">\u96f2\u4f3a\u670d\u5668<\/a> \u7684\u4fe1\u606f\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5168\u9762\u8b1b\u89e3Oracle\u9396\u5b58\u5668\uff0c\u6df1\u5165\u63a2\u8a0e\u5176\u529f\u80fd\u3001\u4f7f\u7528\u65b9\u6cd5\u53ca\u6700\u4f73\u5be6\u8e10\uff0c\u52a9\u60a8\u63d0\u5347\u6578\u64da\u5eab\u6027\u80fd\u8207\u5b89\u5168\u6027\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-172135","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/172135","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=172135"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/172135\/revisions"}],"predecessor-version":[{"id":172136,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/172135\/revisions\/172136"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=172135"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=172135"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=172135"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}