{"id":484,"date":"2026-02-05T17:19:41","date_gmt":"2026-02-05T09:19:41","guid":{"rendered":"http:\/\/47.100.165.17\/wordpress\/?p=484"},"modified":"2026-02-05T17:19:41","modified_gmt":"2026-02-05T09:19:41","slug":"%e3%80%90mysql%e3%80%91undo-log%e6%b8%85%e7%90%86%e6%9c%ba%e5%88%b6%ef%bc%88purge%ef%bc%89%ef%bc%9a%e5%8e%9f%e7%90%86%e3%80%81%e5%88%a4%e6%96%ad%e4%b8%8e%e4%bc%98%e5%8c%96%e5%ae%9e%e6%88%98","status":"publish","type":"post","link":"https:\/\/yunyanglib.cn\/?p=484","title":{"rendered":"\u3010MySQL\u3011Undo Log\u6e05\u7406\u673a\u5236\uff08Purge\uff09\uff1a\u539f\u7406\u3001\u5224\u65ad\u4e0e\u4f18\u5316\u5b9e\u6218"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\" id=\"ub600d217\">\u5728 MySQL InnoDB \u5b58\u50a8\u5f15\u64ce\u4e2d\uff0cUndo Log \u4f5c\u4e3a\u4e8b\u52a1\u56de\u6eda\u4e0e MVCC\uff08\u591a\u7248\u672c\u5e76\u53d1\u63a7\u5236\uff09\u7684\u6838\u5fc3\u7ec4\u4ef6\uff0c\u5176\u751f\u547d\u5468\u671f\u7ba1\u7406\u76f4\u63a5\u5f71\u54cd\u6570\u636e\u5e93\u6027\u80fd\u4e0e\u78c1\u76d8\u7a7a\u95f4\u5229\u7528\u7387\u3002\u4e8b\u52a1\u63d0\u4ea4\u540e Undo Log \u4e0d\u4f1a\u7acb\u5373\u5220\u9664\uff0c\u800c\u662f\u901a\u8fc7\u540e\u53f0 Purge \u673a\u5236\u6e05\u7406\u65e0\u7528\u65e5\u5fd7\u3002\u672c\u6587\u5c06\u6df1\u5165\u89e3\u6790 Purge \u7684\u5de5\u4f5c\u539f\u7406\u3001\u5224\u65ad\u903b\u8f91\uff0c\u5e76\u63d0\u4f9b\u53ef\u843d\u5730\u7684\u4f18\u5316\u7b56\u7565\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"UczA5\">\u4e00\u3001Purge \u7684\u6838\u5fc3\u903b\u8f91<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"MKRMt\">1. \u4ec0\u4e48\u662f Purge\uff1f<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"u07b8dd3b\">Purge \u662f InnoDB \u901a\u8fc7\u540e\u53f0\u7ebf\u7a0b\uff08Purge Thread\uff09\u6267\u884c\u7684\u5f02\u6b65\u6e05\u7406\u64cd\u4f5c\uff0c\u6838\u5fc3\u76ee\u6807\u662f\u5220\u9664<strong>\u4e0d\u518d\u88ab\u4efb\u4f55\u4e8b\u52a1\u8bbf\u95ee\u7684 Undo Log<\/strong>\uff0c\u91ca\u653e\u78c1\u76d8\u7a7a\u95f4\uff0c\u907f\u514d\u8868\u7a7a\u95f4\u81a8\u80c0\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2. Undo Log \u53ef\u88ab Purge \u7684\u6761\u4ef6<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u53ea\u6709\u540c\u65f6\u6ee1\u8db3\u4ee5\u4e0b\u4e24\u4e2a\u6761\u4ef6\uff0cUndo Log \u624d\u4f1a\u88ab\u6807\u8bb0\u4e3a\u53ef\u6e05\u7406\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u751f\u6210\u8be5 Undo Log \u7684\u4e8b\u52a1\u5df2\u63d0\u4ea4\uff1b<\/li>\n\n\n\n<li>\u6240\u6709\u8bfb\u4e8b\u52a1\u5747\u65e0\u9700\u8bbf\u95ee\u8be5 Undo Log \u5bf9\u5e94\u7684\u5386\u53f2\u7248\u672c\uff08\u5373\u65e0\u4e8b\u52a1\u4f9d\u8d56\u8be5\u7248\u672c\u6570\u636e\uff09\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">3. Purge \u7684\u89e6\u53d1\u65f6\u673a<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">InnoDB \u901a\u8fc7\u4e09\u79cd\u65b9\u5f0f\u89e6\u53d1 Purge\uff0c\u786e\u4fdd\u65e5\u5fd7\u53ca\u65f6\u6e05\u7406\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u5b9a\u65f6\u89e6\u53d1<\/strong>\uff1a\u9ed8\u8ba4\u6bcf 1 \u79d2\u68c0\u67e5\u4e00\u6b21\u53ef\u6e05\u7406\u7684 Undo Log\uff1b<\/li>\n\n\n\n<li><strong>\u4e8b\u52a1\u63d0\u4ea4\u89e6\u53d1<\/strong>\uff1a\u5f53 Undo Log \u7d2f\u79ef\u6570\u91cf\u8fbe\u5230\u9608\u503c\u65f6\uff0c\u63d0\u4ea4\u4e8b\u52a1\u4f1a\u89e6\u53d1 Purge\uff1b<\/li>\n\n\n\n<li><strong>Checkpoint \u89e6\u53d1<\/strong>\uff1aRedo Log \u6267\u884c Checkpoint \u65f6\uff0c\u82e5 Undo Log \u5360\u7528\u7a7a\u95f4\u8fc7\u5927\uff0c\u4e3b\u52a8\u89e6\u53d1\u6e05\u7406\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"fw7mt\">\u4e8c\u3001\u5982\u4f55\u5224\u65ad Undo Log \u53ef\u88ab Purge\uff1f<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">InnoDB \u901a\u8fc7<strong>Read View<\/strong>\uff08\u8bfb\u89c6\u56fe\uff09\u5b9e\u73b0 Undo Log \u7684\u53ef\u7528\u6027\u5224\u65ad\uff0c\u6838\u5fc3\u903b\u8f91\u56f4\u7ed5\u4e8b\u52a1 ID\uff08<code>trx_id<\/code>\uff09\u5c55\u5f00\uff1a<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. Read View \u7684\u6838\u5fc3\u5c5e\u6027<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u6bcf\u4e2a\u8bfb\u4e8b\u52a1\u542f\u52a8\u65f6\u4f1a\u751f\u6210 Read View\uff0c\u5305\u542b\u4e24\u4e2a\u5173\u952e\u53c2\u6570\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>min_trx_id<\/code>\uff1a\u5f53\u524d\u6d3b\u8dc3\u4e8b\u52a1\u7684\u6700\u5c0f ID\uff1b<\/li>\n\n\n\n<li><code>max_trx_id<\/code>\uff1a\u5f53\u524d\u7cfb\u7edf\u4e2d\u5373\u5c06\u5206\u914d\u7684\u4e0b\u4e00\u4e2a\u4e8b\u52a1 ID\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2. \u5224\u65ad\u89c4\u5219<\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th class=\"has-text-align-left\" data-align=\"left\">Undo Log \u7684 trx_id \u4e0e Read View \u5173\u7cfb<\/th><th class=\"has-text-align-left\" data-align=\"left\">\u7ed3\u8bba<\/th><th class=\"has-text-align-left\" data-align=\"left\">\u539f\u56e0<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-left\" data-align=\"left\"><code>trx_id<\/code> &lt; <code>min_trx_id<\/code><\/td><td class=\"has-text-align-left\" data-align=\"left\">Undo log\u53ef Purge<\/td><td class=\"has-text-align-left\" data-align=\"left\">\u8be5\u4e8b\u52a1\u5728\u6240\u6709\u6d3b\u8dc3\u4e8b\u52a1\u524d\u63d0\u4ea4\uff0c\u5176\u5386\u53f2\u7248\u672c\u4e0d\u518d\u88ab\u4efb\u4f55\u8bfb\u4e8b\u52a1\u8bbf\u95ee<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\"><code>trx_id <\/code>\u2265 <code>max_trx_id<\/code><\/td><td class=\"has-text-align-left\" data-align=\"left\">Undo log\u4e0d\u53ef Purge<\/td><td class=\"has-text-align-left\" data-align=\"left\">\u8be5\u4e8b\u52a1\u5728\u5f53\u524d\u8bfb\u4e8b\u52a1\u540e\u542f\u52a8\uff0c\u53ef\u80fd\u88ab\u5176\u4ed6\u4e8b\u52a1\u8bbf\u95ee<\/td><\/tr><tr><td class=\"has-text-align-left\" data-align=\"left\"><code>min_trx_id<\/code> \u2264<code> trx_id<\/code> \u2264 <code>max_trx_id<\/code><\/td><td class=\"has-text-align-left\" data-align=\"left\">\u9700\u6821\u9a8c<\/td><td class=\"has-text-align-left\" data-align=\"left\">\u9700\u8fdb\u4e00\u6b65\u68c0\u67e5\u8be5\u4e8b\u52a1\u662f\u5426\u4ecd\u6d3b\u8dc3\uff0c\u82e5\u5df2\u63d0\u4ea4\u4e14\u65e0\u5176\u4ed6\u8bfb\u4e8b\u52a1\u8bbf\u95ee\u5219\u53ef Purge<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"p8YJn\">\u4e09\u3001Purge \u4f18\u5316\u7b56\u7565\uff08\u5b9e\u6218\u7bc7\uff09<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u9488\u5bf9 Undo Log \u5806\u79ef\u3001\u8868\u7a7a\u95f4\u81a8\u80c0\u7b49\u95ee\u9898\uff0c\u53ef\u901a\u8fc7\u4ee5\u4e0b 4 \u4e2a\u7ef4\u5ea6\u4f18\u5316 Purge \u6548\u7387\uff1a<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"XVoKN\">1. \u8c03\u6574 Purge \u7ebf\u7a0b\u6570<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"ue07704b6\">Purge \u7ebf\u7a0b\u6570\u9ed8\u8ba4\u4e3a 4\uff08MySQL 8.0+\uff09\uff0c\u82e5 Undo Log \u5806\u79ef\u4e25\u91cd\uff08\u5982\u957f\u4e8b\u52a1\u591a\u3001\u5e76\u53d1\u9ad8\uff09\uff0c\u53ef\u589e\u52a0\u7ebf\u7a0b\u6570\u63d0\u5347\u6e05\u7406\u901f\u5ea6\uff1a<\/p>\n\n\n\n<pre id=\"PthKd\" class=\"wp-block-code\"><code>-- \u67e5\u770b\u5f53\u524d\u7ebf\u7a0b\u6570\nshow global variables like \"innodb_purge_threads\";\n\n-- \u8c03\u6574\u4e3a8\u4e2a\u7ebf\u7a0b\n# 1. \u7f16\u8f91\u914d\u7f6e\u6587\u4ef6\nvim \/data\/mysql\/conf\/my.cnf\n\n# 2. \u5728\u914d\u7f6e\u6587\u4ef6\u7684 &#91;mysqld] \u8282\u70b9\u4e0b\u6dfb\u52a0\u6216\u4fee\u6539\u4e00\u884c\ninnodb_purge_threads = 8\n\n# 3. \u91cd\u542f MySQL \u670d\u52a1\n\/etc\/init.d\/mysql.server restart<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"450\" src=\"http:\/\/47.100.165.17\/wordpress\/wp-content\/uploads\/2026\/02\/image-81-1024x450.png\" alt=\"\" class=\"wp-image-491\" srcset=\"https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-81-1024x450.png 1024w, https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-81-300x132.png 300w, https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-81-768x337.png 768w, https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-81.png 1106w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u6ce8\u610f\uff1a<code>innodb_purge_threads<\/code>\u53d8\u91cf<strong>\u53ea\u80fd\u5728 MySQL \u670d\u52a1\u542f\u52a8\u524d\u914d\u7f6e\uff0c\u542f\u52a8\u540e\u65e0\u6cd5\u901a\u8fc7 set global \u5728\u7ebf\u4fee\u6539<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u9002\u7528\u573a\u666f<\/strong>\uff1aUndo Log \u5806\u79ef\u4e25\u91cd\u3001CPU \u8d44\u6e90\u5145\u8db3\u7684\u670d\u52a1\u5668\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"ljJwp\">2. \u914d\u7f6e\u56de\u6eda\u6bb5\u6e05\u7406\u9891\u7387<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"u2d50d0d9\"><code>innodb_purge_rseg_truncate_frequency<\/code> \u63a7\u5236\u6bcf\u6267\u884c\u591a\u5c11\u6b21 Purge \u64cd\u4f5c\u540e\uff0c\u68c0\u67e5\u5e76\u5220\u9664\u65e0\u7528\u7684\u56de\u6eda\u6bb5\uff0c\u9ed8\u8ba4\u503c\u662f128\uff08\u56de\u6eda\u6bb5\u662f Undo Log \u7684\u5b58\u50a8\u5355\u5143\uff09\uff1a<\/p>\n\n\n\n<pre id=\"EclCQ\" class=\"wp-block-code\"><code>-- \u67e5\u770b\u5f53\u524d\u914d\u7f6e\nshow global variables like \"innodb_purge_rseg_truncate_frequency\";\n\n-- \u8c03\u6574\u4e3a\u6bcf10\u6b21Purge\u68c0\u67e5\u4e00\u6b21\u56de\u6eda\u6bb5\nset global innodb_purge_rseg_truncate_frequency = 10;<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" width=\"998\" height=\"390\" src=\"http:\/\/47.100.165.17\/wordpress\/wp-content\/uploads\/2026\/02\/image-80.png\" alt=\"\" class=\"wp-image-489\" srcset=\"https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-80.png 998w, https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-80-300x117.png 300w, https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-80-768x300.png 768w\" sizes=\"(max-width: 998px) 100vw, 998px\" \/><\/figure>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6570\u503c\u8d8a\u5c0f\uff1a\u56de\u6eda\u6bb5\u6e05\u7406\u8d8a\u9891\u7e41\uff0cUndo \u8868\u7a7a\u95f4\u622a\u65ad\u8d8a\u53ca\u65f6\uff0c\u4f46\u53ef\u80fd\u589e\u52a0 CPU \u5f00\u9500\uff1b<\/li>\n\n\n\n<li>\u6570\u503c\u8d8a\u5927\uff1a\u56de\u6eda\u6bb5\u6e05\u7406\u9891\u7387\u4f4e\uff0c\u53ef\u80fd\u5bfc\u81f4 Undo \u8868\u7a7a\u95f4\u81a8\u80c0\uff0c\u4f46 CPU \u5f00\u9500\u5c0f\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"aHT0B\">3. \u76d1\u63a7\u5e76\u4f18\u5316\u957f\u4e8b\u52a1<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"u8553a3d4\">\u957f\u4e8b\u52a1\u4f1a\u5bfc\u81f4 Read View \u7684 <code>min_trx_id<\/code> \u957f\u671f\u4e0d\u53d8\uff0c\u4f7f\u5927\u91cf Undo Log \u65e0\u6cd5\u88ab Purge\uff08\u9700\u7b49\u5f85\u957f\u4e8b\u52a1\u7ed3\u675f\uff09\uff0c\u56e0\u6b64\u9700\u76d1\u63a7\u5e76\u4f18\u5316\u957f\u4e8b\u52a1\uff1a<\/p>\n\n\n\n<pre id=\"ErtWT\" class=\"wp-block-code\"><code># \u67e5\u770b\u6267\u884c\u65f6\u95f4\u8fc7\u957f\u7684\u4e8b\u52a1\nshow processlist;\n\n# \u67e5\u770b\u6267\u884c\u65f6\u95f4\u8d85\u8fc7 60 \u79d2\u7684\u4e8b\u52a1\nselect \n  trx_id, \n  trx_started, \n  timestampdiff(second, trx_started, now()) as trx_duration_seconds,\n  trx_query \nfrom information_schema.innodb_trx \nwhere timestampdiff(second, trx_started, now()) > 60;<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"240\" src=\"http:\/\/47.100.165.17\/wordpress\/wp-content\/uploads\/2026\/02\/image-83-1024x240.png\" alt=\"\" class=\"wp-image-493\" srcset=\"https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-83-1024x240.png 1024w, https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-83-300x70.png 300w, https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-83-768x180.png 768w, https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-83-1536x360.png 1536w, https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-83.png 1896w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"ue79875dd\"><strong>\u4f18\u5316\u65b9\u6848<\/strong>\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u8bbe\u7f6e\u4e8b\u52a1\u8d85\u65f6\u65f6\u95f4\uff08<code>innodb_lock_wait_timeout<\/code>\uff09\u3002<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u62c6\u5206\u957f\u4e8b\u52a1\u4e3a\u77ed\u4e8b\u52a1\uff1b<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4f18\u5316\u6162\u67e5\u8be2\uff08\u6dfb\u52a0\u7d22\u5f15\u3001\u51cf\u5c11\u626b\u63cf\u91cf\uff09\uff1b<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"YmZei\">4. \u5f00\u542f Undo Log \u81ea\u52a8\u622a\u65ad<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\" id=\"u835545f3\">\u5f53 Undo \u8868\u7a7a\u95f4\u5927\u5c0f\u8d85\u8fc7 <code>innodb_max_undo_log_size<\/code> \u65f6\uff0c\u81ea\u52a8\u622a\u65ad\u8868\u7a7a\u95f4\uff0c\u91ca\u653e\u7a7a\u95f4\uff1a<\/p>\n\n\n\n<pre id=\"cC2Dn\" class=\"wp-block-code\"><code># \u67e5\u770b\u81ea\u52a8\u622a\u65ad\u914d\u7f6e\nshow global variables like \"innodb_undo_log_truncate\";\nshow global variables like \"innodb_max_undo_log_size\";\n\n# \u5f00\u542f\u81ea\u52a8\u622a\u65ad\uff08\u6c38\u4e45\u5f00\u542f\u9700\u6dfb\u52a0\u5230\u914d\u7f6e\u6587\u4ef6\uff09\nset global innodb_undo_log_truncate = on;\n\n# \u8bbe\u7f6e Undo \u8868\u7a7a\u95f4\u6700\u5927\u5927\u5c0f\u4e3a 2G\uff08\u9ed8\u8ba4 1G\uff09\nset global innodb_max_undo_log_size = 2147483648;  # 2G = 2*1024*1024*1024<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"615\" src=\"http:\/\/47.100.165.17\/wordpress\/wp-content\/uploads\/2026\/02\/image-84-1024x615.png\" alt=\"\" class=\"wp-image-494\" srcset=\"https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-84-1024x615.png 1024w, https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-84-300x180.png 300w, https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-84-768x461.png 768w, https:\/\/yunyanglib.cn\/wp-content\/uploads\/2026\/02\/image-84.png 1326w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">\u603b\u7ed3<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Purge \u673a\u5236\u662f InnoDB Undo Log \u751f\u547d\u5468\u671f\u7ba1\u7406\u7684\u6838\u5fc3\uff0c\u5176\u6548\u7387\u76f4\u63a5\u5f71\u54cd\u6570\u636e\u5e93\u7684\u7a33\u5b9a\u6027\u4e0e\u6027\u80fd\u3002\u5b9e\u9645\u4f18\u5316\u4e2d\u9700\u7ed3\u5408\u4e1a\u52a1\u573a\u666f\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u9ad8\u5e76\u53d1\u573a\u666f\uff1a\u589e\u52a0 Purge \u7ebf\u7a0b\u6570\u3001\u63d0\u9ad8\u56de\u6eda\u6bb5\u6e05\u7406\u9891\u7387\uff1b<\/li>\n\n\n\n<li>\u957f\u4e8b\u52a1\u8f83\u591a\uff1a\u91cd\u70b9\u76d1\u63a7\u5e76\u4f18\u5316\u4e8b\u52a1\u6267\u884c\u6548\u7387\uff1b<\/li>\n\n\n\n<li>\u78c1\u76d8\u7a7a\u95f4\u7d27\u5f20\uff1a\u5f00\u542f Undo Log \u81ea\u52a8\u622a\u65ad\uff0c\u5408\u7406\u8bbe\u7f6e\u8868\u7a7a\u95f4\u9608\u503c\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u901a\u8fc7\u4ee5\u4e0a\u7b56\u7565\uff0c\u53ef\u6709\u6548\u907f\u514d Undo Log \u5806\u79ef\u4e0e\u8868\u7a7a\u95f4\u81a8\u80c0\uff0c\u4fdd\u969c MySQL \u6570\u636e\u5e93\u7684\u9ad8\u6548\u8fd0\u884c\u3002<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 MySQL InnoDB \u5b58\u50a8\u5f15\u64ce\u4e2d\uff0cUndo Log \u4f5c\u4e3a\u4e8b\u52a1\u56de\u6eda\u4e0e MVCC\uff08\u591a\u7248\u672c\u5e76\u53d1\u63a7\u5236\uff09\u7684\u6838\u5fc3\u7ec4<\/p>\n<div class=\"more-link\">\n\t\t\t\t <a href=\"https:\/\/yunyanglib.cn\/?p=484\" class=\"link-btn theme-btn\"><span>Read More <\/span> <i class=\"fa fa-caret-right\"><\/i><\/a>\n\t\t\t<\/div>\n","protected":false},"author":1,"featured_media":497,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17],"tags":[16],"class_list":["post-484","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mysql","tag-mysql"],"_links":{"self":[{"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/posts\/484","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=484"}],"version-history":[{"count":7,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/posts\/484\/revisions"}],"predecessor-version":[{"id":496,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/posts\/484\/revisions\/496"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/media\/497"}],"wp:attachment":[{"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=484"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=484"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=484"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}