{"id":79702,"date":"2024-10-16T13:27:15","date_gmt":"2024-10-16T05:27:15","guid":{"rendered":"https:\/\/server.hk\/cnblog\/79702\/"},"modified":"2024-10-16T13:27:15","modified_gmt":"2024-10-16T05:27:15","slug":"mysql%e6%8c%87%e4%bb%a4-set-variable%ef%bc%88%e8%a8%ad%e7%bd%ae%e8%ae%8a%e9%87%8f%ef%bc%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/79702\/","title":{"rendered":"MySQL\u6307\u4ee4: SET VARIABLE\uff08\u8a2d\u7f6e\u8b8a\u91cf\uff09"},"content":{"rendered":"<h1 id=\"mysql%e6%8c%87%e4%bb%a4-set-variable%ef%bc%88%e8%a8%ad%e7%bd%ae%e8%ae%8a%e9%87%8f%ef%bc%89-uPKacNJvSt\">MySQL\u6307\u4ee4: SET VARIABLE\uff08\u8a2d\u7f6e\u8b8a\u91cf\uff09<\/h1>\n<p>\u5728MySQL\u4e2d\uff0c\u8b8a\u91cf\u7684\u8a2d\u7f6e\u5c0d\u65bc\u6578\u64da\u5eab\u7684\u6027\u80fd\u548c\u884c\u70ba\u6709\u8457\u91cd\u8981\u7684\u5f71\u97ff\u3002\u900f\u904e\u4f7f\u7528SET VARIABLE\u6307\u4ee4\uff0c\u4f7f\u7528\u8005\u53ef\u4ee5\u52d5\u614b\u5730\u8abf\u6574\u6578\u64da\u5eab\u7684\u914d\u7f6e\uff0c\u4ee5\u9069\u61c9\u4e0d\u540c\u7684\u61c9\u7528\u9700\u6c42\u548c\u6027\u80fd\u8981\u6c42\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eSET VARIABLE\u6307\u4ee4\u7684\u7528\u6cd5\u53ca\u5176\u5728MySQL\u4e2d\u7684\u61c9\u7528\u3002<\/p>\n<h2 id=\"set-variable%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-uPKacNJvSt\">SET VARIABLE\u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<p>SET VARIABLE\u6307\u4ee4\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>SET [GLOBAL | SESSION] variable_name = value;<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c<code>variable_name<\/code>\u662f\u8981\u8a2d\u7f6e\u7684\u8b8a\u91cf\u540d\u7a31\uff0c\u800c<code>value<\/code>\u5247\u662f\u8981\u8ce6\u4e88\u8a72\u8b8a\u91cf\u7684\u503c\u3002\u4f7f\u7528\u8005\u53ef\u4ee5\u9078\u64c7\u8a2d\u7f6e\u5168\u5c40\u8b8a\u91cf\uff08GLOBAL\uff09\u6216\u6703\u8a71\u8b8a\u91cf\uff08SESSION\uff09\u3002\u5168\u5c40\u8b8a\u91cf\u5f71\u97ff\u6240\u6709\u9023\u63a5\uff0c\u800c\u6703\u8a71\u8b8a\u91cf\u50c5\u5f71\u97ff\u7576\u524d\u9023\u63a5\u3002<\/p>\n<h2 id=\"%e5%85%a8%e5%b1%80%e8%ae%8a%e9%87%8f%e8%88%87%e6%9c%83%e8%a9%b1%e8%ae%8a%e9%87%8f%e7%9a%84%e5%8d%80%e5%88%a5-uPKacNJvSt\">\u5168\u5c40\u8b8a\u91cf\u8207\u6703\u8a71\u8b8a\u91cf\u7684\u5340\u5225<\/h2>\n<ul>\n<li><strong>\u5168\u5c40\u8b8a\u91cf\uff08GLOBAL\uff09<\/strong>: \u9019\u4e9b\u8b8a\u91cf\u7684\u8a2d\u7f6e\u6703\u5f71\u97ff\u5230\u6240\u6709\u7684\u9023\u63a5\uff0c\u4e26\u4e14\u5728MySQL\u670d\u52d9\u5668\u91cd\u555f\u5f8c\u4ecd\u7136\u4fdd\u6301\u6709\u6548\u3002<\/li>\n<li><strong>\u6703\u8a71\u8b8a\u91cf\uff08SESSION\uff09<\/strong>: \u9019\u4e9b\u8b8a\u91cf\u50c5\u5728\u7576\u524d\u9023\u63a5\u4e2d\u6709\u6548\uff0c\u7576\u9023\u63a5\u95dc\u9589\u5f8c\uff0c\u8a2d\u7f6e\u5c07\u5931\u6548\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%b8%b8%e7%94%a8%e7%9a%84%e8%ae%8a%e9%87%8f%e7%a4%ba%e4%be%8b-uPKacNJvSt\">\u5e38\u7528\u7684\u8b8a\u91cf\u793a\u4f8b<\/h2>\n<p>\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u7528\u7684MySQL\u8b8a\u91cf\u53ca\u5176\u7528\u9014\uff1a<\/p>\n<ul>\n<li><code>max_connections<\/code>: \u8a2d\u7f6e\u6700\u5927\u9023\u63a5\u6578\u3002<\/li>\n<li><code>wait_timeout<\/code>: \u8a2d\u7f6e\u9023\u63a5\u7a7a\u9592\u7684\u8d85\u6642\u6642\u9593\u3002<\/li>\n<li><code>innodb_buffer_pool_size<\/code>: \u8a2d\u7f6eInnoDB\u7de9\u885d\u6c60\u7684\u5927\u5c0f\u3002<\/li>\n<\/ul>\n<h3 id=\"%e7%a4%ba%e4%be%8b%ef%bc%9a%e8%a8%ad%e7%bd%ae%e6%9c%80%e5%a4%a7%e9%80%a3%e6%8e%a5%e6%95%b8-uPKacNJvSt\">\u793a\u4f8b\uff1a\u8a2d\u7f6e\u6700\u5927\u9023\u63a5\u6578<\/h3>\n<p>\u5047\u8a2d\u6211\u5011\u5e0c\u671b\u5c07\u6700\u5927\u9023\u63a5\u6578\u8a2d\u7f6e\u70ba200\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u6307\u4ee4\uff1a<\/p>\n<pre><code>SET GLOBAL max_connections = 200;<\/code><\/pre>\n<p>\u9019\u6a23\u7684\u8a2d\u7f6e\u5c07\u5f71\u97ff\u5230\u6240\u6709\u65b0\u7684\u9023\u63a5\uff0c\u4f46\u5df2\u7d93\u5b58\u5728\u7684\u9023\u63a5\u4e0d\u6703\u53d7\u5230\u5f71\u97ff\u3002<\/p>\n<h3 id=\"%e7%a4%ba%e4%be%8b%ef%bc%9a%e8%a8%ad%e7%bd%ae%e6%9c%83%e8%a9%b1%e8%ae%8a%e9%87%8f-uPKacNJvSt\">\u793a\u4f8b\uff1a\u8a2d\u7f6e\u6703\u8a71\u8b8a\u91cf<\/h3>\n<p>\u5982\u679c\u6211\u5011\u5e0c\u671b\u5728\u7576\u524d\u6703\u8a71\u4e2d\u8a2d\u7f6e\u7b49\u5f85\u8d85\u6642\u6642\u9593\u70ba300\u79d2\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u6307\u4ee4\uff1a<\/p>\n<pre><code>SET SESSION wait_timeout = 300;<\/code><\/pre>\n<p>\u9019\u6a23\u7684\u8a2d\u7f6e\u50c5\u5728\u7576\u524d\u6703\u8a71\u4e2d\u6709\u6548\uff0c\u7576\u6703\u8a71\u7d50\u675f\u5f8c\uff0c\u8a72\u8a2d\u7f6e\u5c07\u5931\u6548\u3002<\/p>\n<h2 id=\"%e6%aa%a2%e6%9f%a5%e8%ae%8a%e9%87%8f%e7%9a%84%e7%95%b6%e5%89%8d%e5%80%bc-uPKacNJvSt\">\u6aa2\u67e5\u8b8a\u91cf\u7684\u7576\u524d\u503c<\/h2>\n<p>\u4f7f\u7528\u8005\u53ef\u4ee5\u901a\u904e\u4ee5\u4e0b\u6307\u4ee4\u6aa2\u67e5\u7576\u524d\u8b8a\u91cf\u7684\u503c\uff1a<\/p>\n<pre><code>SHOW VARIABLES LIKE 'variable_name';<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u8981\u6aa2\u67e5\u6700\u5927\u9023\u63a5\u6578\u7684\u7576\u524d\u503c\uff0c\u53ef\u4ee5\u4f7f\u7528\uff1a<\/p>\n<pre><code>SHOW VARIABLES LIKE 'max_connections';<\/code><\/pre>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-uPKacNJvSt\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u4f7f\u7528SET VARIABLE\u6307\u4ee4\u6642\uff0c\u4f7f\u7528\u8005\u61c9\u6ce8\u610f\u4ee5\u4e0b\u5e7e\u9ede\uff1a<\/p>\n<ul>\n<li>\u67d0\u4e9b\u8b8a\u91cf\u7684\u8a2d\u7f6e\u53ef\u80fd\u9700\u8981\u91cd\u555fMySQL\u670d\u52d9\u5668\u624d\u80fd\u751f\u6548\u3002<\/li>\n<li>\u4e0d\u7576\u7684\u8b8a\u91cf\u8a2d\u7f6e\u53ef\u80fd\u6703\u5c0e\u81f4\u6027\u80fd\u4e0b\u964d\u6216\u7cfb\u7d71\u4e0d\u7a69\u5b9a\uff0c\u56e0\u6b64\u5728\u8abf\u6574\u8b8a\u91cf\u6642\u61c9\u8b39\u614e\u3002<\/li>\n<li>\u5efa\u8b70\u5728\u9032\u884c\u5927\u898f\u6a21\u8b8a\u91cf\u8abf\u6574\u524d\uff0c\u5148\u9032\u884c\u6e2c\u8a66\u4ee5\u78ba\u4fdd\u7cfb\u7d71\u7684\u7a69\u5b9a\u6027\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-uPKacNJvSt\">\u7e3d\u7d50<\/h2>\n<p>SET VARIABLE\u6307\u4ee4\u5728MySQL\u4e2d\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u4f7f\u7528\u8005\u6839\u64da\u9700\u6c42\u8abf\u6574\u6578\u64da\u5eab\u7684\u884c\u70ba\u548c\u6027\u80fd\u3002\u7121\u8ad6\u662f\u5168\u5c40\u8b8a\u91cf\u9084\u662f\u6703\u8a71\u8b8a\u91cf\uff0c\u6b63\u78ba\u7684\u8a2d\u7f6e\u90fd\u80fd\u986f\u8457\u63d0\u5347\u6578\u64da\u5eab\u7684\u6548\u7387\u548c\u7a69\u5b9a\u6027\u3002\u5c0d\u65bc\u9700\u8981\u9748\u6d3b\u914d\u7f6e\u7684\u74b0\u5883\uff0c\u5c24\u5176\u662f\u4f7f\u7528<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u6216<a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a>\u7684\u7528\u6236\uff0c\u638c\u63e1\u9019\u4e9b\u6307\u4ee4\u5c07\u662f\u975e\u5e38\u6709\u76ca\u7684\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3MySQL\u6307\u4ee4SET VARIABLE\uff0c\u5b78\u7fd2\u5982\u4f55\u8a2d\u7f6e\u548c\u8abf\u6574\u8b8a\u91cf\u4ee5\u512a\u5316\u6578\u64da\u5eab\u6027\u80fd\u548c\u914d\u7f6e\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-79702","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/79702","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=79702"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/79702\/revisions"}],"predecessor-version":[{"id":79703,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/79702\/revisions\/79703"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=79702"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=79702"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=79702"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}