{"id":504,"date":"2026-02-06T11:20:17","date_gmt":"2026-02-06T03:20:17","guid":{"rendered":"http:\/\/47.100.165.17\/wordpress\/?p=504"},"modified":"2026-02-06T11:20:17","modified_gmt":"2026-02-06T03:20:17","slug":"%e3%80%90mysql%e3%80%91undo-log-%e9%85%8d%e7%bd%ae%e5%ae%9e%e6%88%98%e6%8c%87%e5%8d%97","status":"publish","type":"post","link":"https:\/\/yunyanglib.cn\/?p=504","title":{"rendered":"\u3010MySQL\u3011Undo Log \u914d\u7f6e\u5b9e\u6218\u6307\u5357"},"content":{"rendered":"\n

InnoDB \u7684 Undo Log\uff08\u56de\u6eda\u65e5\u5fd7\uff09\u662f\u4e8b\u52a1 ACID \u7279\u6027\u7684\u6838\u5fc3\u652f\u6491\uff0c\u4e3b\u8981\u8d1f\u8d23\u4e24\u4ef6\u4e8b\uff1a<\/p>\n\n\n\n

    \n
  1. \u4e8b\u52a1\u56de\u6eda\uff1a\u8bb0\u5f55\u6570\u636e\u4fee\u6539\u524d\u7684\u539f\u59cb\u72b6\u6001\uff0c\u4e8b\u52a1\u5f02\u5e38\u65f6\u53ef\u6062\u590d\u6570\u636e\uff1b<\/li>\n\n\n\n
  2. MVCC\uff08\u591a\u7248\u672c\u5e76\u53d1\u63a7\u5236\uff09\uff1a\u4e3a\u8bfb\u64cd\u4f5c\u63d0\u4f9b\u4e00\u81f4\u6027\u5feb\u7167\uff0c\u5b9e\u73b0\u975e\u9501\u5b9a\u8bfb\u3002<\/li>\n<\/ol>\n\n\n\n

    \u4e0d\u5408\u7406\u7684 Undo Log \u914d\u7f6e\u4f1a\u5bfc\u81f4\u78c1\u76d8\u7a7a\u95f4\u6ea2\u51fa\u3001\u5e76\u53d1\u6027\u80fd\u4e0b\u964d\u3001\u6570\u636e\u6cc4\u9732\u7b49\u95ee\u9898\u3002\u672c\u6587\u57fa\u4e8e MySQL 8.0+ \u7248\u672c\uff0c\u8be6\u89e3 Undo Log \u5173\u952e\u914d\u7f6e\u53c2\u6570\u3001\u4f18\u5316\u65b9\u6848\u4e0e\u5b9e\u64cd\u6b65\u9aa4\u3002<\/p>\n\n\n\n

    \u4e00\u3001\u6838\u5fc3\u914d\u7f6e\u53c2\u6570\u8be6\u89e3\uff08\u9644\u4f18\u5316\u5efa\u8bae\uff09<\/h2>\n\n\n\n
    \u53c2\u6570\u540d\u79f0<\/th>\u4f5c\u7528\u8bf4\u660e<\/th>\u9ed8\u8ba4\u503c<\/th>\u63a8\u8350\u914d\u7f6e<\/th>\u6ce8\u610f\u4e8b\u9879<\/th><\/tr><\/thead>
    innodb_undo_directory<\/code><\/td>\u6307\u5b9a Undo \u8868\u7a7a\u95f4\u5b58\u50a8\u76ee\u5f55<\/td>\u6570\u636e\u76ee\u5f55\uff08\u5982 \/data\/mysql\/data\/<\/code>\uff09<\/td>\u72ec\u7acb SSD \u76ee\u5f55\uff08\u5982 \/data\/mysql\/undo\/<\/code>\uff09<\/td>\u72ec\u7acb\u5b58\u50a8\u53ef\u63d0\u5347 IO \u6027\u80fd\uff0c\u907f\u514d\u4e0e\u6570\u636e\u6587\u4ef6\u7ade\u4e89\u8d44\u6e90<\/td><\/tr>
    innodb_rollback_segments<\/code><\/td>\u56de\u6eda\u6bb5\u6570\u91cf\uff08\u5355\u4e2a\u56de\u6eda\u6bb5\u652f\u6301\u591a\u4e8b\u52a1\uff09<\/td>128<\/td>\u4fdd\u6301\u9ed8\u8ba4\uff08\u9ad8\u5e76\u53d1\u573a\u666f\u53ef\u7ef4\u6301\uff09<\/td>MySQL 8.0.2 \u524d\u53c2\u6570\u540d\u4e3a innodb_undo_logs<\/code>\uff0c\u8303\u56f4 1-128<\/td><\/tr>
    innodb_undo_log_encrypt<\/code><\/td>\u52a0\u5bc6 Undo Log \u9632\u6b62\u6570\u636e\u6cc4\u9732<\/td>OFF<\/td>\u6838\u5fc3\u4e1a\u52a1\u8bbe\u4e3a ON<\/td>\u9700\u914d\u5408 MySQL \u5bc6\u94a5\u73af\u63d2\u4ef6\uff0c\u786e\u4fdd\u5bc6\u94a5\u5b89\u5168<\/td><\/tr>
    innodb_max_undo_log_size<\/code><\/td>\u5355\u4e2a Undo \u8868\u7a7a\u95f4\u6700\u5927\u9608\u503c\uff08\u8d85\u9608\u503c\u89e6\u53d1\u622a\u65ad\uff09<\/td>1G\uff081073741824 \u5b57\u8282\uff09<\/td>2G~4G\uff082147483648<\/code> \u5b57\u8282\uff09<\/td>\u9700\u6839\u636e\u78c1\u76d8\u7a7a\u95f4\u548c\u4e8b\u52a1\u91cf\u8c03\u6574\uff0c\u907f\u514d\u9891\u7e41\u622a\u65ad<\/td><\/tr>
    innodb_undo_log_truncate<\/code><\/td>\u81ea\u52a8\u622a\u65ad\u8fc7\u5927\u7684 Undo \u8868\u7a7a\u95f4<\/td>ON\uff08MySQL 8.0+\uff09<\/td>\u4fdd\u6301\u5f00\u542f<\/td>\u4ec5\u5bf9\u72ec\u7acb Undo \u8868\u7a7a\u95f4\u751f\u6548\uff0c\u7cfb\u7edf\u8868\u7a7a\u95f4\u4e0d\u652f\u6301<\/td><\/tr>
    innodb_purge_threads<\/code><\/td>Purge \u7ebf\u7a0b\u6570\uff08\u6e05\u7406\u65e0\u7528 Undo Log\uff09<\/td>4<\/td>\u9ad8\u5e76\u53d1\u573a\u666f\u8bbe 8~16<\/td>\u5efa\u8bae\u4e0d\u8d85\u8fc7 CPU \u6838\u5fc3\u6570\u7684 1\/2\uff0c\u907f\u514d\u8d44\u6e90\u7ade\u4e89<\/td><\/tr>
    innodb_purge_rseg_truncate_frequency<\/code><\/td>\u6bcf N \u6b21 Purge \u68c0\u67e5\u56de\u6eda\u6bb5\u91ca\u653e<\/td>128<\/td>10~50<\/td>\u5e73\u8861\u6e05\u7406\u9891\u7387\u4e0e CPU \u5f00\u9500\uff0c\u503c\u8d8a\u4f4e\u622a\u65ad\u8d8a\u53ca\u65f6<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
    \"\"<\/figure>\n\n\n\n
    \"\"<\/figure>\n\n\n\n

    \u4e8c\u3001\u4f18\u5316\u914d\u7f6e\u5b9e\u64cd\u6b65\u9aa4\uff08\u751f\u4ea7\u73af\u5883\u9002\u7528\uff09<\/h2>\n\n\n\n

    1. \u914d\u7f6e\u6587\u4ef6\u4fee\u6539<\/h3>\n\n\n\n

    \u7f16\u8f91 MySQL \u914d\u7f6e\u6587\u4ef6 my.cnf<\/code>\uff08\u8def\u5f84\u901a\u5e38\u4e3a \/data\/mysql\/conf\/my.cnf<\/code>\uff09\uff0c\u6dfb\u52a0\u4ee5\u4e0b\u4f18\u5316\u914d\u7f6e\uff1a<\/p>\n\n\n\n

    [mysqld]\n# Undo Log \u72ec\u7acb\u5b58\u50a8\u76ee\u5f55\uff08\u9700\u63d0\u524d\u521b\u5efa\uff09\ninnodb_undo_directory = \/data\/mysql\/undo\/\n\n# \u56de\u6eda\u6bb5\u6570\u91cf\uff08\u4fdd\u6301\u9ed8\u8ba4\u8db3\u591f\u652f\u6301\u9ad8\u5e76\u53d1\uff09\ninnodb_rollback_segments = 128\n\n# \u5f00\u542f Undo Log \u52a0\u5bc6\uff08\u6838\u5fc3\u4e1a\u52a1\u5fc5\u5f00\uff09\ninnodb_undo_log_encrypt = on\n# \u542f\u7528keyring_file\u63d2\u4ef6\nearly-plugin-load = keyring_file.so\n# \u6307\u5b9a\u5bc6\u94a5\u6587\u4ef6\u8def\u5f84\nkeyring_file_data = \/data\/mysql\/keyring\/keyring\n\n# \u5355\u4e2a Undo \u8868\u7a7a\u95f4\u6700\u5927 2G\ninnodb_max_undo_log_size = 2147483648\n\n# \u542f\u7528\u81ea\u52a8\u622a\u65ad\ninnodb_undo_log_truncate = on\n\n# \u63d0\u5347 Purge \u6e05\u7406\u6548\u7387\uff088\u7ebf\u7a0b\uff09\ninnodb_purge_threads = 8\n\n# \u6bcf 20 \u6b21 Purge \u68c0\u67e5\u56de\u6eda\u6bb5\u91ca\u653e\ninnodb_purge_rseg_truncate_frequency = 20<\/code><\/pre>\n\n\n\n
    2. \u76ee\u5f55\u521b\u5efa\u4e0e\u6743\u9650\u914d\u7f6e<\/h3>\n\n\n\n
    # \u521b\u5efa\u72ec\u7acb Undo \u76ee\u5f55\u548c\u5bc6\u94a5\u73af\u76ee\u5f55\nmkdir -p \/data\/mysql\/undo\/\nmkdir -p \/data\/mysql\/keyring\/\n\n# \u6388\u6743 MySQL \u7528\u6237\uff08\u907f\u514d\u6743\u9650\u4e0d\u8db3\uff09\nchown -R mysql.mysql \/data\/mysql\/undo\/\nchmod 700 \/data\/mysql\/undo\/\nchown -R mysql.mysql \/data\/mysql\/keyring\/\nchmod 700 \/data\/mysql\/keyring\/\n\n# \u91cd\u542f MySQL \u4f7f\u914d\u7f6e\u751f\u6548\n\/etc\/init.d\/mysql.server restart<\/code><\/pre>\n\n\n\n
    \u3010\u5e38\u89c1\u95ee\u9898\u89e3\u51b3<\/strong>\u3011\u82e5 MySQL \u542f\u52a8\u62a5 \u201cERROR! The server quit without updating PID file<\/code>\u201d \u4e14\u65e5\u5fd7\u663e \u201cInvalid Filename<\/code>\u201d\uff0c\u53ef\u8fdb\u884c\u5982\u4e0b\u64cd\u4f5c\uff1a<\/p>\n\n\n\n
    # \u521b\u5efa\u4e34\u65f6\u76ee\u5f55\nmkdir -p \/data\/tmp\n\n# \u5c06\u65e7undo log\u6587\u4ef6\u79fb\u52a8\u5230\u4e34\u65f6\u76ee\u5f55\nmv \/data\/mysql\/data\/undo_00* \/data\/tmp\/\n\n# \u91cd\u542fmysql\n\/etc\/init.d\/mysql.server restart<\/code><\/pre>\n\n\n\n
    \"\"<\/figure>\n\n\n\n
    3. \u9a8c\u8bc1\u914d\u7f6e\u6548\u679c<\/h3>\n\n\n\n
    -- \u67e5\u770b Undo \u8868\u7a7a\u95f4\u5217\u8868\u4e0e\u5b58\u50a8\u8def\u5f84\nselect tablespace_name, file_name, engine \nfrom information_schema.files \nwhere file_type = 'UNDO LOG';\n\n-- \u67e5\u770b Undo \u8868\u7a7a\u95f4\u5927\u5c0f\uff08\u5355\u4f4d\uff1aMB\uff09\nselect \n  tablespace_name,\n  round((EXTENT_SIZE * TOTAL_EXTENTS) \/ 1024 \/ 1024, 2) as total_size_mb\nfrom information_schema.files \nwhere file_type = 'UNDO LOG';<\/code><\/pre>\n\n\n\n
    \"\"<\/figure>\n\n\n\n
    \u4e09\u3001\u8fdb\u9636\u64cd\u4f5c\uff1a\u624b\u52a8\u7ba1\u7406 Undo \u8868\u7a7a\u95f4<\/h2>\n\n\n\n
    1. \u624b\u52a8\u521b\u5efa Undo \u8868\u7a7a\u95f4\uff08MySQL 8.0.14+\uff09<\/h3>\n\n\n\n
    \u5f53\u9ed8\u8ba4\u8868\u7a7a\u95f4\u4e0d\u8db3\u65f6\uff0c\u53ef\u65b0\u589e\u989d\u5916\u8868\u7a7a\u95f4\uff1a<\/p>\n\n\n\n
    -- \u521b\u5efa\u540d\u4e3a tmp_undo_001 \u7684 Undo \u8868\u7a7a\u95f4\ncreate undo tablespace tmp_undo_001 add datafile 'tmp_undo_001.ibu';\n\n-- \u9a8c\u8bc1\u65b0\u589e\u8868\u7a7a\u95f4\nselect tablespace_name from information_schema.files where file_type = 'UNDO LOG';<\/code><\/pre>\n\n\n\n
    \"\"<\/figure>\n\n\n\n
    2. \u5b89\u5168\u5220\u9664 Undo \u8868\u7a7a\u95f4<\/h3>\n\n\n\n
    -- 1. \u8bbe\u4e3a inactive \u72b6\u6001\uff08\u505c\u6b62\u5199\u5165\u65b0\u65e5\u5fd7\uff09\nalter undo tablespace tmp_undo_001 set inactive;\n\n-- 2. \u7b49\u5f85 Purge \u7ebf\u7a0b\u6e05\u7406\u8868\u7a7a\u95f4\u5185\u65e0\u7528\u65e5\u5fd7\uff08\u53ef\u901a\u8fc7\u67e5\u8be2\u5927\u5c0f\u786e\u8ba4\uff09\n\n-- 3. \u786e\u8ba4\u65e0\u6570\u636e\u540e\u5220\u9664\u8868\u7a7a\u95f4\ndrop undo tablespace tmp_undo_001;<\/code><\/pre>\n\n\n\n
    \"\"<\/figure>\n\n\n\n
    \u56db\u3001\u5173\u952e\u6ce8\u610f\u4e8b\u9879<\/h2>\n\n\n\n
      \n
    1. \u52a0\u5bc6\u914d\u7f6e<\/strong>\uff1a\u5f00\u542f innodb_undo_log_encrypt = ON<\/code> \u540e\uff0c\u9700\u90e8\u7f72 MySQL \u5bc6\u94a5\u73af\u63d2\u4ef6\uff08\u5982 keyring_file<\/code>\uff09\uff0c\u907f\u514d\u5bc6\u94a5\u4e22\u5931\u5bfc\u81f4\u6570\u636e\u65e0\u6cd5\u8bbf\u95ee\uff1b<\/li>\n\n\n\n
    2. \u622a\u65ad\u673a\u5236<\/strong>\uff1ainnodb_undo_log_truncate<\/code> \u4ec5\u5bf9\u72ec\u7acb Undo \u8868\u7a7a\u95f4\u751f\u6548\uff0c\u7cfb\u7edf\u8868\u7a7a\u95f4\uff08ibdata1\uff09\u4e2d\u7684 Undo Log \u65e0\u6cd5\u81ea\u52a8\u622a\u65ad\uff1b<\/li>\n\n\n\n
    3. \u5e76\u53d1\u4f18\u5316<\/strong>\uff1ainnodb_purge_threads<\/code> \u5efa\u8bae\u6839\u636e CPU \u6838\u5fc3\u6570\u8c03\u6574\uff0c\u9ad8\u5e76\u53d1\u573a\u666f\u8bbe\u4e3a 8~16\uff0c\u907f\u514d\u7ebf\u7a0b\u8fc7\u591a\u5bfc\u81f4\u4e0a\u4e0b\u6587\u5207\u6362\u5f00\u9500\uff1b<\/li>\n\n\n\n
    4. \u76d1\u63a7\u5efa\u8bae<\/strong>\uff1a\u5b9a\u671f\u68c0\u67e5 Undo \u8868\u7a7a\u95f4\u5927\u5c0f\uff0c\u907f\u514d\u56e0\u4e8b\u52a1\u8fc7\u957f\u5bfc\u81f4\u8868\u7a7a\u95f4\u6ea2\u51fa\uff0c\u53ef\u901a\u8fc7 information_schema.files<\/code> \u8868\u76d1\u63a7\u3002<\/li>\n<\/ol>\n\n\n\n
      \u603b\u7ed3<\/h2>\n\n\n\n
      Undo Log \u7684\u914d\u7f6e\u6838\u5fc3\u662f \u201c\u5e73\u8861\u6027\u80fd\u4e0e\u7a7a\u95f4\u201d\uff1a\u901a\u8fc7\u72ec\u7acb\u5b58\u50a8\u63d0\u5347 IO \u6548\u7387\uff0c\u5408\u7406\u8bbe\u7f6e\u56de\u6eda\u6bb5\u4e0e Purge \u7ebf\u7a0b\u4f18\u5316\u5e76\u53d1\uff0c\u5f00\u542f\u52a0\u5bc6\u4fdd\u969c\u6570\u636e\u5b89\u5168\u3002\u5efa\u8bae\u6839\u636e\u4e1a\u52a1\u573a\u666f\uff08\u5982\u5e76\u53d1\u91cf\u3001\u4e8b\u52a1\u957f\u5ea6\uff09\u8c03\u6574\u53c2\u6570\uff0c\u5e76\u5b9a\u671f\u76d1\u63a7\u8868\u7a7a\u95f4\u72b6\u6001\uff0c\u786e\u4fdd InnoDB \u4e8b\u52a1\u7cfb\u7edf\u7a33\u5b9a\u8fd0\u884c\u3002<\/p>\n\n\n\n
      \u5ef6\u4f38\u9605\u8bfb\uff1a<\/p>\n\n\n\n
        \n
      • \u3010MySQL\u3011Undo Log \u6e05\u7406\u673a\u5236\uff08Purge\uff09\uff1a\u539f\u7406\u3001\u5224\u65ad\u4e0e\u4f18\u5316\u5b9e\u6218<\/li>\n\n\n\n
      • \u3010MySQL\u3011Undo Log \u6df1\u5ea6\u89e3\u6790\uff1a\u4e8b\u52a1\u56de\u6eda\u4e0e MVCC \u7684\u5e95\u5c42\u652f\u67f1<\/li>\n<\/ul>\n\n\n\n
        <\/p>\n","protected":false},"excerpt":{"rendered":"
        \u672c\u6587\u57fa\u4e8e MySQL 8.0+ \u7248\u672c\uff0c\u8be6\u89e3 Undo Log \u5173\u952e\u914d\u7f6e\u53c2\u6570\u3001\u4f18\u5316\u65b9\u6848\u4e0e\u5b9e\u64cd\u6b65\u9aa4<\/p>\n","protected":false},"author":1,"featured_media":518,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[17],"tags":[16],"class_list":["post-504","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\/504","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=504"}],"version-history":[{"count":7,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/posts\/504\/revisions"}],"predecessor-version":[{"id":517,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/posts\/504\/revisions\/517"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=\/wp\/v2\/media\/518"}],"wp:attachment":[{"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=504"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=504"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/yunyanglib.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=504"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}