{"id":176909,"date":"2020-10-18T21:23:45","date_gmt":"2020-10-18T13:23:45","guid":{"rendered":"http:\/\/4563.org\/?p=176909"},"modified":"2020-10-18T21:23:45","modified_gmt":"2020-10-18T13:23:45","slug":"mysql-mariadb-online-ddl-%e5%8f%82%e8%80%83%e6%8c%87%e5%8d%97","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=176909","title":{"rendered":"MySQL & MariaDB Online DDL \u53c2\u8003\u6307\u5357"},"content":{"rendered":"
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MySQL & MariaDB Online DDL \u53c2\u8003\u6307\u5357 <\/h1>\n

<\/p>\n

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\u8cc7\u6df1\u5927\u4f6c : mylxsw <\/span> <\/i> 3<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
<\/p>\n

\"MySQL<\/p>\n

\u6982\u8ff0<\/h2>\n

\u5728\u65e9\u671f\u7684 MySQL \u7248\u672c\u4e2d\uff0cDDL \u64cd\u4f5c\uff08\u5982\u521b\u5efa\u7d22\u5f15\u7b49\uff09\u901a\u5e38\u90fd\u9700\u8981\u5bf9\u6570\u636e\u8868\u52a0\u9501\uff0c\u64cd\u4f5c\u8fc7\u7a0b\u4e2d DML \u64cd\u4f5c\u90fd\u4f1a\u88ab\u963b\u585e\uff0c\u5f71\u54cd\u6b63\u5e38\u4e1a\u52a1\u3002MySQL 5.6 \u548c MariaDB 10.0 \u5f00\u59cb\u652f\u6301 Online DDL\uff0c\u53ef\u4ee5\u5728\u6267\u884c DDL \u64cd\u4f5c\u7684\u540c\u65f6\uff0c\u4e0d\u5f71\u54cd DML \u7684\u6b63\u5e38\u6267\u884c\uff0c\u7ebf\u4e0a\u76f4\u63a5\u6267\u884c DDL \u64cd\u4f5c\u5bf9\u7528\u6237\u57fa\u672c\u65e0\u611f\u77e5\uff08\u90e8\u5206\u64cd\u4f5c\u5bf9\u6027\u80fd\u6709\u5f71\u54cd\uff09\u3002<\/p>\n

\u4e0d\u540c\u7248\u672c\u7684\u6570\u636e\u5e93\u5bf9\u5404\u79cd DDL \u8bed\u53e5\u7684\u652f\u6301\u5b58\u5728\u4e00\u5b9a\u7684\u5dee\u5f02\uff0c\u672c\u6587\u5c06\u4f1a\u9488\u5bf9 MySQL \u548c MariaDB \u5bf9 Online DDL \u7684\u652f\u6301\u60c5\u51b5\u505a\u4e00\u4e2a\u6c47\u603b\uff0c\u5728\u9700\u8981\u6267\u884c DDL \u64cd\u4f5c\u65f6\uff0c\u53ef\u4ee5\u53c2\u8003\u672c\u6587\u7684 Online DDL \u652f\u6301\u60c5\u51b5<\/em> \u90e8\u5206\u3002<\/p>\n

\u672c\u6587\u5c06\u4f1a\u6301\u7eed\u4fee\u6b63\u548c\u66f4\u65b0\uff0c\u6700\u65b0\u5185\u5bb9\u8bf7\u53c2\u8003\u6211\u7684 GITHUB \u4e0a\u7684 \u7a0b\u5e8f\u733f\u6210\u957f\u8ba1\u5212 \u9879\u76ee\uff0c\u6b22\u8fce Star\uff0c\u66f4\u591a\u7cbe\u5f69\u5185\u5bb9\u8bf7 follow me\u3002<\/p>\n

\u5728 ALTER TABLE<\/code> \u8bed\u53e5\u4e2d\uff0c\u652f\u6301\u901a\u8fc7 ALGORITHM<\/code> \u548c LOCK<\/code> \u8bed\u53e5\u6765\u5b9e\u73b0 Online DDL\uff1a<\/p>\n

    \n
  • ALGORITHM<\/code> – \u63a7\u5236 DDL \u64cd\u4f5c\u5982\u4f55\u6267\u884c\uff0c\u4f7f\u7528\u54ea\u4e2a\u7b97\u6cd5<\/li>\n
  • LOCK<\/code> – \u63a7\u5236\u5728\u6267\u884c DDL \u65f6\u5141\u8bb8\u5bf9\u8868\u52a0\u9501\u7684\u7ea7\u522b<\/li>\n<\/ul>\n
    ALTER TABLE tab ADD COLUMN c varchar(50), ALGORITHM=INPLACE, LOCK=NONE; <\/code><\/pre>\n
    ALGORITHM \u652f\u6301\u7684\u7b97\u6cd5<\/h3>\n
    \"MySQL<\/p>\n
    \n
    NOCOPY<\/code> \u7b97\u6cd5\u652f\u6301\uff1aMariaDB 10.3.2<\/strong>+\uff0cMySQL \u4e0d\u652f\u6301\u8be5\u7b97\u6cd5<\/strong>\u3002<\/p>\n
    INSTANT<\/code> \u7b97\u6cd5\u652f\u6301\uff1aMariaDB 10.3.2<\/strong>+\uff0cMySQL 8.0.12<\/strong>+\u3002<\/p>\n<\/blockquote>\n
    \u7b97\u6cd5\u4f7f\u7528\u89c4\u5219\uff1a<\/p>\n
      \n
    • \u5982\u679c\u7528\u6237\u6307\u5b9a\u7684\u7b97\u6cd5\u4e3a COPY<\/code>\uff0c\u5219 InnoDB \u4f7f\u7528 COPY<\/code> \u7b97\u6cd5\u3002<\/li>\n
    • \u5982\u679c\u7528\u6237\u6307\u5b9a\u7684\u662f COPY<\/code> \u4e4b\u5916\u7684\u5176\u5b83\u7b97\u6cd5\uff0c\u5219 InnoDB \u4f1a\u6309\u7167\u7b97\u6cd5\u6548\u7387\uff0c\u9009\u62e9\u6700\u9ad8\u6548\u7684\u7b97\u6cd5\uff0c\u6700\u5dee\u7684\u60c5\u51b5\u4e0b\u91c7\u7528\u7528\u6237\u6307\u5b9a\u7684\u7b97\u6cd5\u3002\u6bd4\u5982\u7528\u6237\u6307\u5b9a\u4e86 ALOGRITHM = NOCOPY<\/code>\uff0c\u5219 InnoDB \u4f1a\u4ece (NOCOPY, INSTANT) \u4e2d\u9009\u62e9\u652f\u6301\u7684\u6700\u9ad8\u6548\u7684\u7b97\u6cd5\u3002<\/li>\n<\/ul>\n
      \"MySQL<\/p>\n
      MySQL \u670d\u52a1\u4e3b\u8981\u4e3a Server \u5c42<\/strong> \u548c \u5b58\u50a8\u5f15\u64ce\u5c42<\/strong> \u4e24\u90e8\u5206\u7ec4\u6210\uff0cServer \u5c42\u5305\u542b\u4e86 MySQL \u5927\u90e8\u5206\u6838\u5fc3\u529f\u80fd\uff0c\u6240\u6709\u7684\u5185\u7f6e\u51fd\u6570\uff0c\u8de8\u5b58\u50a8\u5f15\u64ce\u7684\u529f\u80fd\u5982\u5b58\u50a8\u8fc7\u7a0b\u3001\u89e6\u53d1\u5668\u3001\u89c6\u56fe\u7b49\u3002\u5b58\u50a8\u5f15\u64ce\u5c42\u8d1f\u8d23\u6570\u636e\u7684\u5b58\u50a8\u548c\u8bfb\u53d6\uff0c\u91c7\u7528\u4e86\u63d2\u4ef6\u5f0f\u7684\u67b6\u6784\u6a21\u5f0f\u3002<\/p>\n
      COPY \u7b97\u6cd5<\/strong> \u4f5c\u7528\u5728 Server \u5c42\uff0c\u5176\u6267\u884c\u8fc7\u7a0b\u90fd\u662f\u5728 Server \u5c42\uff0c\u56e0\u6b64\u6240\u6709\u5b58\u50a8\u5f15\u64ce\u90fd\u652f\u6301\u4f7f\u7528\u8be5\u7b97\u6cd5\uff0c\u6267\u884c\u8fc7\u7a0b\u5982\u4e0b\u56fe<\/p>\n
      \"MySQL<\/p>\n
      INPLACE \u7b97\u6cd5<\/strong> \u4f5c\u7528\u4e8e\u5b58\u50a8\u5f15\u64ce\u5c42\uff0c\u662f InnoDB \u5b58\u50a8\u5f15\u64ce\u7279\u6709\u7684 DDL \u7b97\u6cd5\uff0c\u6267\u884c\u8fc7\u7a0b\u5982\u4e0b\u56fe\u6240\u793a<\/p>\n
      \"MySQL<\/p>\n
      LOCK \u7b56\u7565<\/h3>\n
      \u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0cMySQL\/MariaDB \u5728\u6267\u884c DDL \u671f\u95f4\u4f1a\u4f7f\u7528\u5c3d\u53ef\u80fd\u5c11\u7684\u9501\uff0c\u5982\u679c\u5fc5\u8981\uff0c\u53ef\u4ee5\u901a\u8fc7 LOCK \u5b50\u53e5\u63a7\u5236\u5728\u6267\u884c DDL \u65f6\u5141\u8bb8\u5bf9\u8868\u52a0\u9501\u7684\u7ea7\u522b\u3002\u5982\u679c\u6307\u5b9a\u7684\u64cd\u4f5c\u6240\u8981\u6c42\u7684\u9650\u5236\u7ea7\u522b\u4e0d\u6ee1\u8db3\uff08EXCLUSIVE > SHARED > NONE<\/strong>\uff09\uff0c\u5219\u8bed\u53e5\u6267\u884c\u5931\u8d25\u5e76\u62a5\u9519\u3002<\/p>\n
      \"MySQL<\/p>\n
      \n
      \u4e3a\u4e86\u907f\u514d\u6267\u884c DDL \u65f6\uff0c\u7531\u4e8e\u9501\u8868\u5bfc\u81f4\u751f\u4ea7\u670d\u52a1\u4e0d\u53ef\u7528\uff0c\u5728\u6267\u884c\u8868\u7ed3\u6784\u53d8\u66f4\u8bed\u53e5\u65f6\uff0c\u53ef\u4ee5\u6dfb\u52a0 LOCK=NONE<\/code> \u5b50\u53e5\uff0c\u5982\u679c\u8bed\u53e5\u9700\u8981\u83b7\u53d6\u5171\u4eab\u9501\u6216\u8005\u6392\u5b83\u9501\uff0c\u5219\u4f1a\u76f4\u63a5\u62a5\u9519\uff0c\u8fd9\u6837\u5c31\u53ef\u4ee5\u907f\u514d\u610f\u5916\u9501\u8868\uff0c\u9020\u6210\u7ebf\u4e0a\u670d\u52a1\u4e0d\u53ef\u7528\u4e86\u3002<\/p>\n<\/blockquote>\n
      Online DDL \u6267\u884c\u8fc7\u7a0b<\/h2>\n
      Online DDL \u64cd\u4f5c\u4e3b\u8981\u5206\u4e3a\u4e09\u4e2a\u9636\u6bb5\uff1a<\/p>\n
      \"MySQL<\/p>\n
        \n
      • \n
        \u9636\u6bb5 1<\/strong>\uff1a\u521d\u59cb\u5316<\/p>\n
        \u5728\u521d\u59cb\u5316\u9636\u6bb5\uff0c\u670d\u52a1\u5668\u4f1a\u6839\u636e\u5b58\u50a8\u5f15\u64ce\u7684\u80fd\u529b\uff0c\u64cd\u4f5c\u7684\u8bed\u53e5\u548c\u7528\u6237\u6307\u5b9a\u7684 ALGORITHM<\/code> \u548c LOCK<\/code> \u9009\u9879\u6765\u51b3\u5b9a\u5141\u8bb8\u591a\u5927\u7a0b\u5ea6\u7684\u5e76\u53d1\u3002\u5728\u8fd9\u4e2a\u9636\u6bb5\u4f1a\u521b\u5efa\u4e00\u4e2a \u53ef\u5347\u7ea7\u7684\u5143\u6570\u636e\u5171\u4eab\u9501<\/strong>\uff08 SU \uff09\u6765\u4fdd\u62a4\u8868\u5b9a\u4e49\u3002<\/p>\n<\/li>\n
      • \n
        \u9636\u6bb5 2<\/strong>\uff1a\u6267\u884c<\/p>\n
        \u8fd9\u4e2a\u9636\u6bb5\u4f1a \u51c6\u5907<\/strong> \u5e76 \u6267\u884c<\/strong> DDL \u8bed\u53e5\uff0c\u6839\u636e \u9636\u6bb5 1<\/strong> \u8bc4\u4f30\u7684\u7ed3\u679c\u6765\u51b3\u5b9a\u662f\u5426\u5c06\u5143\u6570\u636e\u9501\u5347\u7ea7\u4e3a \u6392\u5b83\u9501<\/strong> \uff08 X \uff09\uff0c\u5982\u679c\u9700\u8981\u5347\u7ea7\u4e3a\u6392\u5b83\u9501\uff0c\u5219\u53ea\u5728 DDL \u7684 \u51c6\u5907\u9636\u6bb5<\/strong> \u77ed\u6682\u7684\u6dfb\u52a0\u6392\u5b83\u9501\u3002<\/p>\n<\/li>\n
      • \n
        \u9636\u6bb5 3<\/strong>\uff1a\u63d0\u4ea4\u8868\u5b9a\u4e49<\/p>\n
        \u5728\u8868\u5b9a\u4e49\u7684\u63d0\u4ea4\u9636\u6bb5\uff0c\u5143\u6570\u636e\u9501\u4f1a\u5347\u7ea7\u4e3a\u6392\u5b83\u9501\u6765\u66f4\u65b0\u8868\u7684\u5b9a\u4e49\u3002\u72ec\u5360\u6392\u5b83\u9501\u7684\u6301\u7eed\u65f6\u95f4\u975e\u5e38\u77ed\u3002<\/p>\n<\/li>\n<\/ul>\n
        \n
        \u5143\u6570\u636e\u9501\uff08 MDL\uff0cMetadata Lock \uff09\u4e3b\u8981\u7528\u4e8e DDL \u548c DML \u64cd\u4f5c\u4e4b\u95f4\u7684\u5e76\u53d1\u8bbf\u95ee\u63a7\u5236\uff0c\u4fdd\u62a4\u8868\u7ed3\u6784\uff08\u8868\u5b9a\u4e49\uff09\u7684\u4e00\u81f4\uff0c\u4fdd\u8bc1\u8bfb\u5199\u7684\u6b63\u786e\u6027\u3002MDL \u4e0d\u9700\u8981\u663e\u5f0f\u7684\u4f7f\u7528\uff0c\u5728\u8bbf\u95ee\u8868\u65f6\u4f1a\u81ea\u52a8\u52a0\u4e0a\u3002<\/p>\n
        \"MySQL<\/p>\n<\/blockquote>\n
        \u7531\u4e8e\u4e0a\u9762\u4e09\u4e2a\u9636\u6bb5\u4e2d\u5bf9\u5143\u6570\u636e\u9501\u7684\u72ec\u5360\uff0c Online DDL \u8fc7\u7a0b\u5fc5\u987b\u7b49\u5f85\u5df2\u7ecf\u6301\u6709\u5143\u6570\u636e\u9501\u7684\u5e76\u53d1\u4e8b\u52a1\u63d0\u4ea4\u6216\u8005\u56de\u6eda\u624d\u80fd\u7ee7\u7eed\u6267\u884c\u3002<\/p>\n
        \n
        \u6ce8\u610f\uff1a\u5f53 Online DDL \u64cd\u4f5c\u6b63\u5728\u7b49\u5f85\u5143\u6570\u636e\u9501\u65f6\uff0c\u8be5\u5143\u6570\u636e\u9501\u4f1a\u5904\u4e8e\u6302\u8d77\u72b6\u6001\uff0c\u540e\u7eed\u7684\u6240\u6709\u4e8b\u52a1\u90fd\u4f1a\u88ab\u963b\u585e<\/strong>\u3002\u5728 MariaDB 10.3 \u4e4b\u540e\uff0c\u53ef\u4ee5\u901a\u8fc7\u6dfb\u52a0 NO WAIT<\/code> \u6216\u8005 WAIT n<\/code> \u6765\u63a7\u5236\u7b49\u5f85\u6240\u5f97\u8d85\u65f6\u65f6\u95f4\uff0c\u8d85\u65f6\u7acb\u5373\u5931\u8d25\u3002<\/p>\n
        ALTER TABLE tbl_name [WAIT n|NOWAIT] ... CREATE ... INDEX ON tbl_name (index_col_name, ...) [WAIT n|NOWAIT] ... DROP INDEX ... [WAIT n|NOWAIT] DROP TABLE tbl_name [WAIT n|NOWAIT] ... LOCK TABLE ... [WAIT n|NOWAIT] OPTIMIZE TABLE tbl_name [WAIT n|NOWAIT] RENAME TABLE tbl_name [WAIT n|NOWAIT] ... SELECT ... FOR UPDATE [WAIT n|NOWAIT] SELECT ... LOCK IN SHARE MODE [WAIT n|NOWAIT] TRUNCATE TABLE tbl_name [WAIT n|NOWAIT] <\/code><\/pre>\n<\/blockquote>\n
        \u8bc4\u4f30 Online DDL \u64cd\u4f5c\u7684\u6027\u80fd<\/h2>\n
        Online DDL \u64cd\u4f5c\u7684\u6027\u80fd\u53d6\u51b3\u4e8e\u662f\u5426\u53d1\u751f\u4e86\u8868\u7684\u91cd\u5efa\u3002\u5728\u5bf9\u5927\u8868\u6267\u884c DDL \u64cd\u4f5c\u4e4b\u524d\uff0c\u4e3a\u4e86\u907f\u514d\u5f71\u54cd\u6b63\u5e38\u4e1a\u52a1\u64cd\u4f5c\uff0c\u6700\u597d\u662f\u5148\u8bc4\u4f30\u4e00\u4e0b DDL \u8bed\u53e5\u7684\u6027\u80fd\u518d\u9009\u62e9\u5982\u4f55\u64cd\u4f5c\u3002<\/p>\n
          \n
        1. \u590d\u5236\u8868\u7ed3\u6784\uff0c\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u8868<\/li>\n
        2. \u5728\u65b0\u521b\u5efa\u7684\u8868\u4e2d\u63d2\u5165\u5c11\u91cf\u6570\u636e<\/li>\n
        3. \u5728\u65b0\u8868\u4e0a\u9762\u6267\u884c DDL \u64cd\u4f5c<\/li>\n
        4. \u68c0\u67e5\u6267\u884c\u64cd\u4f5c\u540e\u8fd4\u56de\u7684 rows affected<\/code> \u662f\u5426\u662f 0<\/strong>\u3002\u5982\u679c\u8be5\u503c\u975e 0<\/strong>\uff0c\u5219\u610f\u5473\u7740\u9700\u8981\u62f7\u8d1d\u8868\u6570\u636e\uff0c\u6b64\u65f6\u5bf9 DDL \u7684\u4e0a\u7ebf\u9700\u8981\u614e\u91cd\u8003\u8651\uff0c\u5468\u5bc6\u8ba1\u5212<\/li>\n<\/ol>\n
          \u6bd4\u5982<\/p>\n
            \n
          • \n
            \u4fee\u6539\u67d0\u4e00\u5217\u7684\u9ed8\u8ba4\u503c\uff08\u5feb\u901f\uff0c\u4e0d\u4f1a\u5f71\u54cd\u5230\u8868\u6570\u636e\uff09<\/p>\n
            Query OK, 0 rows affected (0.07 sec) <\/code><\/pre>\n<\/li>\n
          • \n
            \u6dfb\u52a0\u7d22\u5f15\uff08\u9700\u8981\u82b1\u8d39\u4e00\u4e9b\u65f6\u95f4\uff0c\u4f46\u662f 0 rows affected<\/code> \u8bf4\u660e\u6ca1\u6709\u53d1\u751f\u8868\u62f7\u8d1d\uff09<\/p>\n
            Query OK, 0 rows affected (21.42 sec) <\/code><\/pre>\n<\/li>\n
          • \n
            \u4fee\u6539\u5217\u7684\u6570\u636e\u7c7b\u578b\uff08\u9700\u8981\u82b1\u8d39\u5f88\u957f\u65f6\u95f4\uff0c\u5e76\u4e14\u91cd\u5efa\u8868\uff09<\/p>\n
            Query OK, 1671168 rows affected (1 min 35.54 sec) <\/code><\/pre>\n<\/li>\n<\/ul>\n
            \u7531\u4e8e\u5728\u6267\u884c Online DDL \u8fc7\u7a0b\u4e2d\u9700\u8981\u8bb0\u5f55\u5e76\u53d1\u6267\u884c\u7684 DML \u64cd\u4f5c\u53d1\u751f\u7684\u53d8\u66f4\uff0c\u7136\u540e\u5728\u6267\u884c\u5b8c DDL \u64cd\u4f5c\u4e4b\u540e\u518d\u5e94\u7528\u8fd9\u4e9b\u53d8\u66f4\uff0c\u56e0\u6b64\u4f7f\u7528 Online DDL \u64cd\u4f5c\u82b1\u8d39\u7684\u65f6\u95f4\u6bd4\u4e0d\u4f7f\u7528 Online \u6a21\u5f0f\u6267\u884c\u8981\u66f4\u957f\u4e00\u4e9b\u3002<\/p>\n
            Online DDL \u652f\u6301\u60c5\u51b5<\/h2>\n
            INSTANT<\/code> \u7b97\u6cd5\u652f\u6301\uff1aMariaDB 10.3.2<\/strong>+\uff0cMySQL 8.0.12<\/strong>+\u3002NOCOPY<\/code> \u53ea\u652f\u6301 MariaDB 10.3.2 \u4ee5\u4e0a\u7248\u672c\uff0c\u4e0d\u652f\u6301 MySQL\uff0c\u8fd9\u91cc\u5c31\u6682\u4e14\u5ffd\u7565\u4e86\u3002<\/p>\n
            \u91cd\u70b9\u5173\u6ce8\u662f\u5426 \u91cd\u5efa\u8868<\/strong> \u548c \u652f\u6301\u5e76\u53d1 DML<\/strong>\uff1a\u4e0d\u9700\u8981\u91cd\u5efa\u8868\uff0c\u652f\u6301\u5e76\u53d1 DML \u6700\u4f73\u3002<\/p>\n
            \"MySQL<\/p>\n
            \u4e8c\u7ea7\u7d22\u5f15<\/h3>\n
            \"MySQL<\/p>\n
            \u8bf4\u660e\uff1a<\/p>\n
              \n
            • \u2460 \u7b2c\u4e00\u6b21\u6dfb\u52a0\u5168\u6587\u7d22\u5f15\u5b57\u6bb5\u65f6\u9700\u8981\u91cd\u5efa\u8868\uff0c\u4e4b\u540e\u5c31\u4e0d\u9700\u8981\u4e86<\/li>\n<\/ul>\n
              \u4e3b\u952e<\/h3>\n
              \"MySQL<\/p>\n
              \u8bf4\u660e\uff1a<\/p>\n
                \n
              • \u91cd\u5efa\u805a\u7c07\u7d22\u5f15\u603b\u662f\u9700\u8981\u62f7\u8d1d\u8868\u6570\u636e\uff08 InnoDB \u662f\u201c\u7d22\u5f15\u7ec4\u7ec7\u8868\u201d\uff09\uff0c\u6240\u4ee5\u6700\u597d\u662f\u5728\u521b\u5efa\u8868\u7684\u65f6\u5019\u5c31\u5b9a\u4e49\u597d\u4e3b\u952e<\/li>\n
              • \u5982\u679c\u521b\u5efa\u8868\u662f\u6ca1\u6709\u6307\u5b9a\u4e3b\u952e\uff0cInnoDB \u4f1a\u9009\u62e9\u7b2c\u4e00\u4e2a NOT NULL<\/code> \u7684 UNIQUE<\/code> \u7d22\u5f15\u4f5c\u4e3a\u4e3b\u952e\uff0c\u6216\u8005\u4f7f\u7528\u7cfb\u7edf\u751f\u6210\u7684 KEY<\/li>\n
              • \u2461 \u5bf9\u805a\u7c07\u7d22\u5f15\u6765\u8bf4\uff0c\u4f7f\u7528 INPLACE<\/code> \u6a21\u5f0f\u6bd4 COPY<\/code> \u6a21\u5f0f\u8981\u9ad8\u6548\u4e00\u4e9b\uff1a\u4e0d\u4f1a\u4ea7\u751f undo log<\/strong> \u548c redo log<\/strong>\uff0c\u4e8c\u7ea7\u7d22\u5f15\u662f\u6709\u5e8f\u7684\uff0c\u6240\u4ee5\u53ef\u4ee5\u6309\u987a\u5e8f\u52a0\u8f7d\uff0c\u4e0d\u9700\u8981\u4f7f\u7528\u53d8\u66f4\u7f13\u51b2\u533a<\/li>\n<\/ul>\n
                \u666e\u901a\u5217<\/h3>\n
                \"MySQL<\/p>\n
                \u8bf4\u660e\uff1a<\/p>\n
                  \n
                • \n
                  \u2462 \u5e76\u53d1 DML\uff1a\u5f53\u63d2\u5165\u4e00\u4e2a\u81ea\u589e\u5217\u65f6\uff0c\u4e0d\u652f\u6301\u5e76\u53d1\u7684 DML \u64cd\u4f5c\uff0c\u6dfb\u52a0\u81ea\u589e\u5217\u65f6\uff0c\u5927\u91cf\u7684\u6570\u636e\u4f1a\u88ab\u91cd\u65b0\u7ec4\u7ec7\uff0c\u4ee3\u4ef7\u9ad8\u6602<\/p>\n<\/li>\n
                • \n
                  \u2462 \u91cd\u5efa\u8868\uff1a\u6dfb\u52a0\u5217\u65f6\uff0cMySQL 5.7 \u53ca\u4e4b\u524d\u7248\u672c\u9700\u8981\u91cd\u5efa\u8868\uff0cMySQL 8.0 \u5f53 ALGORITHM=INPLACE<\/code> \u65f6\uff0c\u9700\u8981\u91cd\u5efa\u8868\uff0cALGORITHM=INSTANT<\/code> \u65f6\u4e0d\u9700\u8981\u91cd\u5efa<\/p>\n<\/li>\n
                • \n
                  \u2462 INSTANT \u7b97\u6cd5\uff1a\u6dfb\u52a0\u5217\u65f6\uff0c\u4f7f\u7528 INSTANT<\/code> \u7b97\u6cd5\u6709\u4e0b\u9762\u8fd9\u4e9b\u9650\u5236<\/p>\n
                    \n
                  • \u6dfb\u52a0\u5217\u64cd\u4f5c\u4e0d\u80fd\u548c\u5176\u5b83\u4e0d\u652f\u6301 INSTANT<\/code> \u7b97\u6cd5\u7684\u64cd\u4f5c\u5408\u5e76\u4e3a\u4e00\u6761 ALTER TABLE<\/code> \u8bed\u53e5<\/li>\n
                  • \u65b0\u589e\u7684\u5217\u53ea\u80fd\u6dfb\u52a0\u5230\u8868\u7684\u6700\u540e\uff0c\u4e0d\u80fd\u653e\u5230\u5176\u5b83\u5217\u7684\u524d\u9762\uff0c\u5728 MariaDB 10.4 \u4e4b\u540e\uff0c\u652f\u6301\u5728\u4efb\u610f\u4f4d\u7f6e\u6dfb\u52a0<\/li>\n
                  • \u4e0d\u80fd\u5c06\u5217\u6dfb\u52a0\u5230 ROW_FORMAT=COMPRESSED<\/code> \u7684\u8868\u4e2d<\/li>\n
                  • \u4e0d\u80fd\u5c06\u5217\u6dfb\u52a0\u5230\u5305\u542b FULLTEXT<\/code> \u7684\u8868\u4e2d<\/li>\n
                  • \u4e0d\u80fd\u5c06\u5217\u6dfb\u52a0\u5230\u4e34\u65f6\u8868\u4e2d\uff0c\u4e34\u65f6\u8868\u53ea\u652f\u6301 ALGORITHM=COPY<\/code><\/li>\n
                  • \u4e0d\u80fd\u5c06\u5217\u6dfb\u52a0\u5230\u9a7b\u7559\u5728\u6570\u636e\u5b57\u5178\u8868\u7a7a\u95f4\u4e2d\u7684\u8868\u4e2d<\/li>\n
                  • \u5728\u6dfb\u52a0\u5217\u7684\u65f6\u5019\u4e0d\u4f1a\u8ba1\u7b97\u884c\u7684\u5927\u5c0f\u9650\u5236\uff0c\u8be5\u9650\u5236\u5728\u6267\u884c DML \u64cd\u4f5c\u63d2\u5165\u6216\u8005\u66f4\u65b0\u8868\u65f6\u624d\u4f1a\u88ab\u68c0\u67e5<\/li>\n<\/ul>\n<\/li>\n
                  • \n
                    \u2463 \u5220\u9664\u5217\u65f6\uff0c\u5927\u91cf\u7684\u6570\u636e\u9700\u8981\u88ab\u91cd\u65b0\u7ec4\u7ec7\uff0c\u4ee3\u4ef7\u9ad8\u6602\uff0c\u5728 MariaDB 10.4 \u4e4b\u540e\uff0c\u5220\u9664\u5217\u652f\u6301 INSTANT \u7b97\u6cd5<\/p>\n<\/li>\n
                  • \n
                    \u2464 \u91cd\u547d\u540d\u5217\u65f6\uff0c\u786e\u4fdd\u53ea\u6539\u53d8\u5217\u540d\uff0c\u4e0d\u6539\u53d8\u6570\u636e\u7c7b\u578b\uff0c\u8fd9\u6837\u624d\u80fd\u652f\u6301\u5e76\u53d1\u7684 DML \u64cd\u4f5c<\/p>\n<\/li>\n
                  • \n
                    \u2465 \u6269\u5c55 VARCHAR \u957f\u5ea6\u65f6\uff0cINPLACE \u662f\u6709\u6761\u4ef6\u7684\uff0c\u5fc5\u987b\u4fdd\u8bc1\u7528\u4e8e\u6807\u8bc6\u5b57\u7b26\u4e32\u957f\u5ea6\u7684\u957f\u5ea6\u5b57\u8282\u4e0d\u53d8\uff08\u8fd9\u91cc\u8bf4\u7684\u90fd\u662f\u5b57\u8282\uff0c\u4e0d\u662f VARCHAR \u7684\u5b57\u7b26\u957f\u5ea6\uff0c\u5b57\u8282\u5360\u7528\u4e0e\u91c7\u7528\u7684\u5b57\u7b26\u96c6\u6709\u5173\uff0cutf8<\/code> \u5b57\u7b26\u96c6\u4e0b\uff0c\u4e00\u4e2a\u5b57\u7b26\u5360 3 \u4e2a\u5b57\u8282\uff0c utf8mb4<\/code> \u5219 4 \u4e2a\u5b57\u8282\uff09<\/p>\n
                      \n
                    • \u5f53 VARCHAR \u5217\u957f\u5ea6\u5728 0-255 \u4e2a\u5b57\u8282\u65f6\uff0c\u957f\u5ea6\u6807\u8bc6\u5360\u7528\u4e00\u4e2a\u5b57\u8282<\/li>\n
                    • \u5f53 VARCHAR \u5217\u957f\u5ea6\u5927\u4e8e 255 \u4e2a\u5b57\u8282\u65f6\uff0c\u957f\u5ea6\u6807\u8bc6\u5360\u7528\u4e24\u4e2a\u5b57\u8282<\/li>\n<\/ul>\n
                      \u56e0\u6b64\uff0cINPLACE \u53ea\u652f\u6301 0-255 \u4e2a\u5b57\u8282\u4e4b\u95f4\u6216\u8005 256 \u4e2a\u5b57\u8282\u5230\u66f4\u5927\u7684\u957f\u5ea6\u4e4b\u95f4\u7684\u53d8\u66f4\u3002VARCHAR \u5217\u957f\u5ea6\u51cf\u5c0f\u662f\u4e0d\u652f\u6301 INPLACE \u7684\u3002<\/p>\n<\/li>\n
                    • \n
                      \u2466 \u81ea\u589e\u5217\u503c\u53d8\u66f4\u662f\u4fee\u6539\u7684\u5185\u5b58\u4e2d\u7684\u503c\uff0c\u4e0d\u662f\u6570\u636e\u6587\u4ef6<\/p>\n<\/li>\n
                    • \n
                      \u2467 \u2468 \u8bbe\u7f6e\u5217\u4e3a [NOT] NULL<\/code> \u65f6\uff0c\u5927\u91cf\u7684\u6570\u636e\u88ab\u91cd\u65b0\u7ec4\u7ec7\uff0c\u4ee3\u4ef7\u9ad8\u6602<\/p>\n<\/li>\n
                    • \n
                      \u2469 \u4fee\u6539 ENUM<\/code> \u548c SET<\/code> \u7c7b\u578b\u7684\u5217\u5b9a\u4e49\u65f6\uff0c\u662f\u5426\u9700\u8981\u8868\u62f7\u8d1d\u53d6\u51b3\u4e8e\u5df2\u6709\u5143\u7d20\u7684\u4e2a\u6570\u548c\u63d2\u5165\u6210\u5458\u7684\u4f4d\u7f6e<\/p>\n<\/li>\n
                    • \n
                      \u246b \u5728 MariaDB 10.4 \u4e4b\u540e\uff0c\u5217\u6392\u5e8f\u652f\u6301 INSTANT \u7b97\u6cd5<\/p>\n<\/li>\n
                    • \n
                      \u246c \u5728 MariaDB 10.4.3 \u4e4b\u540e\uff0cInnoDB \u652f\u6301\u4f7f\u7528 INSTANT \u7b97\u6cd5\u589e\u52a0\u5217\u7684\u957f\u5ea6\uff0c\u4f46\u662f\u4e5f\u6709\u4e00\u4e9b\u9650\u5236\uff0c\u5177\u4f53\u53c2\u8003 Changing the Data Type of a Column<\/p>\n<\/li>\n<\/ul>\n
                      \u751f\u6210\u5217<\/h3>\n
                      \"MySQL<\/p>\n
                      \u5916\u952e<\/h3>\n
                      \"MySQL<\/p>\n
                      \u8bf4\u660e\uff1a<\/p>\n
                        \n
                      • \u246d \u6dfb\u52a0\u5916\u952e\u65f6\uff0c\u53ea\u6709\u5f53 foreign_key_checks<\/code> \u9009\u9879\u88ab\u7981\u7528\u7684\u65f6\u5019\u624d\u652f\u6301 INPLACE<\/code> \u7b97\u6cd5<\/li>\n<\/ul>\n
                        \u8868<\/h3>\n
                        \"MySQL<\/p>\n
                        \u8bf4\u660e\uff1a<\/p>\n
                          \n
                        • \u246e\u246f \u5f53\u5b57\u7b26\u96c6\u4e0d\u540c\u65f6\uff0c\u9700\u8981\u91cd\u5efa\u8868<\/li>\n
                        • \u2470\u2471\u2472 \u5982\u679c\u8868\u4e2d\u5305\u542b FULLTEXT<\/code> \u7684\u5b57\u6bb5\uff0c\u5219\u4e0d\u652f\u6301 INPLACE<\/li>\n<\/ul>\n
                          \u8868\u7a7a\u95f4<\/h3>\n
                          \"MySQL<\/p>\n
                          \u9650\u5236<\/h3>\n
                            \n
                          • \u5728\u4e34\u65f6\u8868 TEMPORARY TABLE<\/code> \u4e0a\u521b\u5efa\u7d22\u5f15\u65f6\u4f1a\u53d1\u751f\u8868\u62f7\u8d1d<\/li>\n
                          • \u5982\u679c\u8868\u4e0a\u6709 ON...CASCADE<\/code> \u6216\u8005 ON...SET NULL<\/code> \u7ea6\u675f\uff0c\u5219 ALERT TABLE<\/code> \u4e0d\u652f\u6301\u5b57\u53e5 LOCK=NONE<\/code><\/li>\n
                          • \u5728 Onlne DDL \u64cd\u4f5c\u5b8c\u6210\u4e4b\u524d\uff0c\u5b83\u5fc5\u987b\u7b49\u5f85\u76f8\u5173\u8868\u5df2\u7ecf\u6301\u6709\u5143\u6570\u636e\u9501\u7684\u4e8b\u52a1\u63d0\u4ea4\u6216\u8005\u56de\u6eda\uff0c\u5728\u8fd9\u4e2a\u8fc7\u7a0b\u4e2d\uff0c\u76f8\u5173\u8868\u7684\u65b0\u4e8b\u52a1\u4f1a\u88ab\u963b\u585e\uff0c\u65e0\u6cd5\u6267\u884c<\/li>\n
                          • \u5f53\u5728\u5927\u8868\u4e0a\u6267\u884c\u6d89\u53ca\u5230\u8868\u91cd\u5efa\u7684 DDL \u65f6\uff0c\u4f1a\u5b58\u5728\u4ee5\u4e0b\u9650\u5236\n
                              \n
                            • \u6ca1\u6709\u4efb\u4f55\u673a\u5236\u53ef\u4ee5\u6682\u505c Online DDL \u64cd\u4f5c\u6216\u9650\u5236 Online DDL \u64cd\u4f5c\u7684 I\/O \u6216 CPU \u4f7f\u7528\u7387<\/li>\n
                            • \u5982\u679c\u64cd\u4f5c\u5931\u8d25\uff0c\u5219\u56de\u6eda Online DDL \u64cd\u4f5c\u7684\u4ee3\u4ef7\u975e\u5e38\u9ad8\u6602<\/li>\n
                            • \u957f\u65f6\u95f4\u8fd0\u884c\u7684 Online DDL \u53ef\u80fd\u4f1a\u5bfc\u81f4\u590d\u5236\u5ef6\u8fdf\u3002Online DDL \u64cd\u4f5c\u5fc5\u987b\u5728 Master \u4e0a\u6267\u884c\u5b8c\u6210\u540e\u624d\u80fd\u5728 Slave \u4e0a\u6267\u884c\uff0c\u5728\u8fd9\u4e2a\u8fc7\u7a0b\u4e2d\uff0c \u5e76\u53d1\u5904\u7406\u7684 DML \u5728 Slave \u4e0a\u9762\u5fc5\u987b\u7b49\u5f85 DDL \u64cd\u4f5c\u5b8c\u6210\u540e\u624d\u4f1a\u6267\u884c\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n
                              \u5199\u5728\u6700\u540e<\/h2>\n
                              \u672c\u6587\u5c06\u4f1a\u6301\u7eed\u4fee\u6b63\u548c\u66f4\u65b0\uff0c\u6700\u65b0\u5185\u5bb9\u8bf7\u53c2\u8003\u6211\u7684 GITHUB \u4e0a\u7684 \u7a0b\u5e8f\u733f\u6210\u957f\u8ba1\u5212 \u9879\u76ee\uff0c\u6b22\u8fce Star\uff0c\u66f4\u591a\u7cbe\u5f69\u5185\u5bb9\u8bf7 follow me\u3002<\/p>\n
                              \u53c2\u8003<\/h2>\n
                                \n
                              • MariaDB Knowledge Base: InnoDB Online DDL<\/li>\n
                              • MariaDB Knowledge Base: WAIT and NOWAIT<\/li>\n
                              • MySQL 5.6: InnoDB and Online DDL<\/li>\n
                              • MySQL 5.7: InnoDB and Online DDL<\/li>\n
                              • MySQL 8.0: InnoDB and Online DDL<\/li>\n
                              • \u6781\u5ba2\u65f6\u95f4\uff1aMySQL \u5b9e\u6218 45 \u8bb2<\/li>\n<\/ul><\/div>\n
                                 \u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (0<\/span>)        <\/div>\n
                                 <\/div>\n<\/p><\/div>\n<\/p><\/div>\n
                                  \n
                                • \n","protected":false},"excerpt":{"rendered":"
                                  MySQL & Maria…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"_links":{"self":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/176909"}],"collection":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=176909"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/176909\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=176909"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=176909"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=176909"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}