{"id":926,"date":"2025-04-21T20:44:17","date_gmt":"2025-04-21T12:44:17","guid":{"rendered":"https:\/\/eve2333.top\/?p=926"},"modified":"2025-04-21T20:44:17","modified_gmt":"2025-04-21T12:44:17","slug":"mysql%e6%95%b0%e6%8d%ae%e5%ba%93%e5%85%a5%e9%97%a8%e5%88%b0%e5%a4%a7%e8%9b%87%e5%b0%9a%e7%a1%85%e8%b0%b7%e5%ae%8b%e7%ba%a2%e5%ba%b7%e8%80%81%e5%b8%88%e7%ac%94%e8%ae%b0-%e9%ab%98%e7%ba%a7%e7%af%87-p-13","status":"publish","type":"post","link":"https:\/\/eve2333.top\/?p=926","title":{"rendered":"MySQL\u6570\u636e\u5e93\u5165\u95e8\u5230\u5927\u86c7\u5c1a\u7845\u8c37\u5b8b\u7ea2\u5eb7\u8001\u5e08\u7b14\u8bb0 \u9ad8\u7ea7\u7bc7 part13"},"content":{"rendered":"\n

 \u7b2c13\u7ae0_\u4e8b\u52a1\u57fa\u7840\u77e5\u8bc6<\/h1>\n\n\n\n

\u4e8b\u52a1\u662f\u6570\u636e\u5e93\u533a\u522b\u4e8e\u6587\u4ef6\u7cfb\u7edf\u7684\u91cd\u8981\u7279\u6027\u4e4b\u4e00\uff0c\u5f53\u6211\u4eec\u6709\u4e86\u4e8b\u52a1\u5c31\u4f1a\u8ba9\u6570\u636e\u5e93\u59cb\u7ec8\u4fdd\u6301\u4e00\u81f4\u6027\uff0c\u540c\u65f6\u6211\u4eec\u8fd8\u80fd\u901a\u8fc7\u4e8b\u52a1\u7684\u673a\u5236\u6062\u590d\u5230\u67d0\u4e2a\u65f6\u95f4\u70b9\uff0c\u8fd9\u6837\u53ef\u4ee5\u4fdd\u8bc1\u5df2\u63d0\u4ea4\u5230\u6570\u636e\u5e93\u7684\u4fee\u6539\u4e0d\u4f1a\u56e0\u4e3a\u7cfb\u7edf\u5d29\u6e83\u800c\u4e22\u5931.<\/p>\n\n\n\n

1.1 \u5b58\u50a8\u5f15\u64ce\u652f\u6301\u60c5\u51b5<\/h3>\n\n\n\n

SHOW ENGINES\u547d\u4ee4\u6765\u67e5\u770b\u5f53\u524dMySQL\u652f\u6301\u7684\u5b58\u50a8\u5f15\u64ce\u90fd\u6709\u54ea\u4e9b\uff0c\u4ee5\u53ca\u8fd9\u4e9b\u5b58\u50a8\u5f15\u64ce\u662f\u5426\u652f\u6301\u4e8b\u52a1\u3002\u5176\u4e2dinnodb\u662f\u552f\u4e00\u652f\u6301\u4e8b\u7269\u7684<\/p>\n\n\n\n

1.2 \u6982\u5ff5<\/h3>\n\n\n\n

\u4e8b\u52a1\uff1a\u4e00\u7ec4\u903b\u8f91\u64cd\u4f5c\u5355\u5143\uff0c\u4f7f\u6570\u636e\u4ece\u4e00\u79cd\u72b6\u6001\u53d8\u6362\u5230\u53e6\u4e00\u79cd\u72b6\u6001\u3002<\/p>\n\n\n\n

\u4e8b\u52a1\u5904\u7406\u7684\u539f\u5219\uff1a\u4fdd\u8bc1\u6240\u6709\u4e8b\u52a1\u90fd\u4f5c\u4e3a\u4e00\u4e2a\u5de5\u4f5c\u5355\u5143\u6765\u6267\u884c\uff0c\u5373\u4f7f\u51fa\u73b0\u4e86\u6545\u969c\uff0c\u90fd\u4e0d\u80fd\u6539\u53d8\u8fd9\u79cd\u6267\u884c\u65b9\u5f0f\u3002\u5f53\u5728\u4e00\u4e2a\u4e8b\u52a1\u4e2d\u6267\u884c\u591a\u4e2a\u64cd\u4f5c\u65f6\uff0c\u8981\u4e48\u6240\u6709\u7684\u4e8b\u52a1\u90fd\u88ab\u63d0\u4ea4\uff08commit\uff09\uff0c\u90a3\u4e48\u8fd9\u4e9b\u4fee\u6539\u5c31\u6c38\u4e45\u5730\u4fdd\u5b58\u4e0b\u6765\uff1b\u8981\u4e48\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\u5c06\u653e\u5f03\u6240\u4f5c\u7684\u6240\u6709\u4fee\u6539\uff0c\u6574\u4e2a\u4e8b\u52a1\u56de\u6eda\uff08rollback\uff09\u5230\u6700\u521d\u72b6\u6001\u3002<\/p>\n\n\n\n

#\u6848\u4f8b\uff1aAA\u7528\u6237\u7ed9BB\u7528\u6237\u8f6c\u8d26100\nupdate account set money = money -100 where name 'AA';\n#\u670d\u52a1\u5668\u5ca9\u673a\nupdate account set money=money+100 where name='BB';<\/code><\/pre>\n\n\n\n
1.3 ACID\u7279\u6027<\/h3>\n\n\n\n
1.\u539f\u5b50\u6027 (atomicity)\uff1a \u539f\u5b50\u6027\u662f\u6307\u4e8b\u52a1\u662f\u4e00\u4e2a\u4e0d\u53ef\u5206\u5272\u7684\u5de5\u4f5c\u5355\u4f4d\uff0c\u8981\u4e48\u5168\u90e8\u63d0\u4ea4\uff0c\u8981\u4e48\u5168\u90e8\u5931\u8d25\u56de\u6eda\u3002\u5373\u8981\u4e48\u8f6c\u8d26\u6210\u529f\uff0c\u8981\u4e48\u8f6c\u8d26\u5931\u8d25\uff0c\u662f\u4e0d\u5b58\u5728\u4e2d\u95f4\u7684\u72b6\u6001\u3002\u5982\u679c\u65e0\u6cd5\u4fdd\u8bc1\u539f\u5b50\u6027\u4f1a\u600e\u4e48\u6837\uff1f\u5c31\u4f1a\u51fa\u73b0\u6570\u636e\u4e0d\u4e00\u81f4\u7684\u60c5\u5f62\uff0cA\u8d26\u6237\u51cf\u53bb100\u5143\uff0c\u800cB\u8d26\u6237\u589e\u52a0100\u5143\u64cd\u4f5c\u5931\u8d25\uff0c\u7cfb\u7edf\u5c06\u65e0\u6545\u4e22\u5931100\u5143\u3002<\/p>\n\n\n\n
2.\u4e00\u81f4\u6027 (consistency)\uff1a \uff08\u56fd\u5185\u5f88\u591a\u7f51\u7ad9\u4e0a\u5bf9\u4e00\u81f4\u6027\u7684\u9610\u8ff0\u6709\u8bef\uff0c\u5177\u4f53\u4f60\u53ef\u4ee5\u53c2\u8003 Wikipedia \u5bf9 Consistency \u7684\u9610\u8ff0\uff09 \u6839\u636e\u5b9a\u4e49\uff0c\u4e00\u81f4\u6027\u662f\u6307\u4e8b\u52a1\u6267\u884c\u524d\u540e\uff0c\u6570\u636e\u4ece\u4e00\u4e2a\u5408\u6cd5\u6027\u72b6\u6001\u53d8\u6362\u5230\u53e6\u5916\u4e00\u4e2a\u5408\u6cd5\u6027\u72b6\u6001\u3002\u8fd9\u79cd\u72b6\u6001\u662f\u8bed\u4e49\u4e0a\u7684\u800c\u4e0d\u662f\u8bed\u6cd5\u4e0a\u7684\uff0c\u8ddf\u5177\u4f53\u7684\u4e1a\u52a1\u6709\u5173\u3002<\/p>\n\n\n\n
\u4ec0\u4e48\u662f\u5408\u6cd5\u7684\u6570\u636e\u72b6\u6001\u5462\uff1f\u6ee1\u8db3\u9884\u5b9a\u7684\u7ea6\u675f\u7684\u72b6\u6001\u5c31\u53eb\u505a\u5408\u6cd5\u7684\u72b6\u6001\u3002\u901a\u4fd7\u4e00\u70b9\uff0c\u8fd9\u72b6\u6001\u662f\u7531\u4f60\u81ea\u5df1\u6765\u5b9a\u4e49\u7684\uff08\u6bd4\u5982\u6ee1\u8db3\u73b0\u5b9e\u4e16\u754c\u4e2d\u7684\u7ea6\u675f\uff09\u3002\u6ee1\u8db3\u8fd9\u4e2a\u72b6\u6001\uff0c\u6570\u636e\u5c31\u662f\u4e00\u81f4\u7684\uff0c\u4e0d\u6ee1\u8db3\u8fd9\u4e2a\u72b6\u6001\uff0c\u6570\u636e\u5c31\u662f\u4e0d\u4e00\u81f4\u7684\uff01\u5982\u679c\u4e8b\u52a1\u4e2d\u7684\u67d0\u4e2a\u64cd\u4f5c\u5931\u8d25\u4e86\uff0c\u7cfb\u7edf\u5c31\u4f1a\u81ea\u52a8\u64a4\u9500\u5f53\u524d\u6b63\u5728\u6267\u884c\u7684\u4e8b\u52a1\uff0c\u8fd4\u56de\u5230\u4e8b\u52a1\u64cd\u4f5c\u4e4b\u524d\u7684\u72b6\u6001\u3002<\/p>\n\n\n\n
\u4e3e\u4f8b1\uff1aA\u8d26\u6237\u6709200\u5143\uff0c\u8f6c\u8d26300\u5143\u51fa\u53bb\uff0c\u6b64\u65f6A\u8d26\u6237\u4f59\u989d\u4e3a-100\u5143\u3002\u4f60\u81ea\u7136\u5c31\u53d1\u73b0\u4e86\u6b64\u65f6\u6570\u636e\u662f\u4e0d\u4e00\u81f4\u7684\uff0c\u4e3a\u4ec0\u4e48\u5462\uff1f\u56e0\u4e3a\u4f60\u5b9a\u4e49\u4e86\u4e00\u4e2a\u72b6\u6001\uff0c\u4f59\u989d\u8fd9\u5217\u5fc5\u987b >= 0\u3002<\/p>\n\n\n\n
\u4e3e\u4f8b2\uff1aA\u8d26\u6237200\u5143\uff0c\u8f6c\u8d2650\u5143\u7ed9B\u8d26\u6237\uff0cA\u8d26\u6237\u7684\u94b1\u6263\u4e86\uff0c\u4f46\u662fB\u8d26\u6237\u56e0\u4e3a\u5404\u79cd\u610f\u5916\uff0c\u4f59\u989d\u5e76\u6ca1\u6709\u589e\u52a0\u3002\u4f60\u4e5f\u77e5\u9053\u6b64\u65f6\u6570\u636e\u662f\u4e0d\u4e00\u81f4\u7684\uff0c\u4e3a\u4ec0\u4e48\u5462\uff1f\u56e0\u4e3a\u4f60\u5b9a\u4e49\u4e86\u4e00\u4e2a\u72b6\u6001\uff0c\u8981\u6c42A+B\u7684\u603b\u4f59\u989d\u5fc5\u987b\u4e0d\u53d8\u3002<\/p>\n\n\n\n
\u4e3e\u4f8b3\uff1a\u5728\u6570\u636e\u8868\u4e2d\u6211\u4eec\u5c06\u59d3\u540d\u5b57\u6bb5\u8bbe\u7f6e\u4e3a\u552f\u4e00\u6027\u7ea6\u675f\uff0c\u8fd9\u65f6\u5f53\u4e8b\u52a1\u8fdb\u884c\u63d0\u4ea4\u6216\u8005\u4e8b\u52a1\u53d1\u751f\u56de\u6eda\u7684\u65f6\u5019\uff0c\u5982\u679c\u6570\u636e\u8868\u4e2d\u7684\u59d3\u540d\u4e0d\u552f\u4e00\uff0c\u5c31\u7834\u574f\u4e86\u4e8b\u52a1\u7684\u4e00\u81f4\u6027\u8981\u6c42\u3002<\/p>\n\n\n\n
3. \u9694\u79bb\u578b\uff08isolation\uff09\uff1a<\/p>\n\n\n\n
\u4e8b\u52a1\u7684\u9694\u79bb\u6027\u662f\u6307\u4e00\u4e2a\u4e8b\u52a1\u7684\u6267\u884c\u4e0d\u80fd\u88ab\u5176\u4ed6\u4e8b\u52a1\u5e72\u6270\uff0c\u5373\u4e00\u4e2a\u4e8b\u52a1\u5185\u90e8\u7684\u64cd\u4f5c\u53ca\u4f7f\u7528\u7684\u6570\u636e\u5bf9\u5e76\u53d1\u7684\u5176\u4ed6\u4e8b\u52a1\u662f\u9694\u79bb\u7684\uff0c\u5e76\u53d1\u6267\u884c\u7684\u5404\u4e2a\u4e8b\u52a1\u4e4b\u95f4\u4e0d\u80fd\u4e92\u76f8\u5e72\u6270\u3002<\/strong><\/p>\n\n\n\n
\u5982\u679c\u65e0\u6cd5\u4fdd\u8bc1\u9694\u79bb\u6027\u4f1a\u600e\u4e48\u6837\uff1f\u5047\u8bbeA\u8d26\u6237\u6709200\u5143\uff0cB\u8d26\u62370\u5143\u3002A\u8d26\u6237\u5f80B\u8d26\u6237\u8f6c\u8d26\u4e24\u6b21\uff0c\u6bcf\u6b21\u91d1\u989d\u4e3a50\u5143\uff0c\u5206\u522b\u5728\u4e24\u4e2a\u4e8b\u52a1\u4e2d\u6267\u884c\u3002\u5982\u679c\u65e0\u6cd5\u4fdd\u8bc1\u9694\u79bb\u6027\uff0c\u4f1a\u51fa\u73b0\u4e0b\u9762\u7684\u60c5\u5f62\uff1a
UPDATE accounts SET money = money - 50 WHERE NAME =\u2018AA';
UPDATE accounts SET money = money + 50 WHERE NAME = BB';<\/p>\n\n\n\n
4.\u00b7\u6301\u4e45\u6027\uff08durability\uff09\uff1a<\/p>\n\n\n\n
\u6301\u4e45\u6027\u662f\u6307\u4e00\u4e2a\u4e8b\u52a1\u4e00\u65e6\u88ab\u63d0\u4ea4\uff0c\u5b83\u5bf9\u6570\u636e\u5e93\u4e2d\u6570\u636e\u7684\u6539\u53d8\u5c31\u662f\u6c38\u4e45\u6027\u7684\uff0c\u63a5\u4e0b\u6765\u7684\u5176\u4ed6\u64cd\u4f5c\u548c\u6570\u636e\u5e93\u6545\u969c\u4e0d\u5e94\u8be5\u5bf9\u5176\u6709\u4efb\u4f55\u5f71\u54cd\u3002<\/p>\n\n\n\n
\u6301\u4e45\u6027\u662f\u901a\u8fc7\u4e8b\u52a1\u65e5\u5fd7\u6765\u4fdd\u8bc1\u7684\u3002\u65e5\u5fd7\u5305\u62ec\u4e86\u91cd\u505a\u65e5\u5fd7\u548c\u56de\u6eda\u65e5\u5fd7\u3002\u5f53\u6211\u4eec\u901a\u8fc7\u4e8b\u52a1\u5bf9\u6570\u636e\u8fdb\u884c\u4fee\u6539\u7684\u65f6\u5019\uff0c\u9996\u5148\u4f1a\u5c06\u6570\u636e\u5e93\u7684\u53d8\u5316\u4fe1\u606f\u8bb0\u5f55\u5230\u91cd\u505a\u65e5\u5fd7\u4e2d\uff0c\u7136\u540e\u518d\u5bf9\u6570\u636e\u5e93\u4e2d\u5bf9\u5e94\u7684\u884c\u8fdb\u884c\u4fee\u6539\u3002\u8fd9\u6837\u505a\u7684\u597d\u5904\u662f\uff0c\u5373\u4f7f\u6570\u636e\u5e93\u7cfb\u7edf\u5d29\u6e83\uff0c\u6570\u636e\u5e93\u91cd\u542f\u540e\u4e5f\u80fd\u627e\u5230\u6ca1\u6709\u66f4\u65b0\u5230\u6570\u636e\u5e93\u7cfb\u7edf\u4e2d\u7684\u91cd\u505a\u65e5\u5fd7\uff0c\u91cd\u65b0\u6267\u884c\uff0c\u4ece\u800c\u4f7f\u4e8b\u52a1\u5177\u6709\u6301\u4e45\u6027\u3002<\/p>\n\n\n\n
1.4 \u4e8b\u52a1\u7684\u72b6\u6001<\/h3>\n\n\n\n
\u6d3b\u52a8\u7684\uff08active)
\u4e8b\u52a1\u5bf9\u5e94\u7684\u6570\u636e\u5e93\u64cd\u4f5c\u6b63\u5728\u6267\u884c\u8fc7\u7a0b\u4e2d\u65f6\uff0c\u6211\u4eec\u5c31\u8bf4\u8be5\u4e8b\u52a1\u5904\u5728\u6d3b\u52a8\u7684\u72b6\u6001\u3002<\/p>\n\n\n\n
\u90e8\u5206\u63d0\u4ea4\u7684\uff08partiallycommitted)
\u5f53\u4e8b\u52a1\u4e2d\u7684\u6700\u540e\u4e00\u4e2a\u64cd\u4f5c\u6267\u884c\u5b8c\u6210\uff0c\u4f46\u7531\u4e8e\u64cd\u4f5c\u90fd\u5728\u5185\u5b58\u4e2d\u6267\u884c\uff0c\u6240\u9020\u6210\u7684\u5f71\u54cd\u5e76\u6ca1\u6709\u5237\u65b0\u5230\u78c1\u76d8\u65f6\uff0c\u6211\u4eec\u5c31\u8bf4\u8be5\u4e8b\u52a1\u5904\u5728\u90e8\u5206\u63d0\u4ea4\u7684\u72b6\u6001\u3002\u4e00\u4e2a\u4e8b\u52a1\u4e2d4\u4e2a\u4f9d\u6b21\u6267\u884c\uff0c\u5fc5\u5b9a<\/p>\n\n\n\n
\u5931\u8d25\u7684\uff08failed)
\u5f53\u4e8b\u52a1\u5904\u5728\u6d3b\u52a8\u7684\u6216\u8005\u90e8\u5206\u63d0\u4ea4\u7684\u72b6\u6001\u65f6\uff0c\u53ef\u80fd\u9047\u5230\u4e86\u67d0\u4e9b\u9519\u8bef\uff08\u6570\u636e\u5e93\u81ea\u8eab\u7684\u9519\u8bef\u3001\u64cd\u4f5c\u7cfb\u7edf\u9519\u8bef\u6216\u8005\u76f4\u63a5\u65ad\u7535\u7b49\uff09\u800c\u65e0\u6cd5\u7ee7\u7eed\u6267\u884c\uff0c\u6216\u8005\u4eba\u4e3a\u7684\u505c\u6b62\u5f53\u524d\u4e8b\u52a1\u7684\u6267\u884c\uff0c\u6211\u4eec\u5c31\u8bf4\u8be5\u4e8b\u52a1\u5904\u5728\u5931\u8d25\u7684\u72b6\u6001\u3002<\/p>\n\n\n\n
\u4e2d\u6b62\u7684 (aborted)
\u5982\u679c\u4e8b\u52a1\u6267\u884c\u4e86\u4e00\u90e8\u5206\u800c\u53d8\u4e3a\u5931\u8d25\u7684\u72b6\u6001\uff0c\u90a3\u4e48\u5c31\u9700\u8981\u628a\u5df2\u7ecf\u4fee\u6539\u7684\u4e8b\u52a1\u4e2d\u7684\u64cd\u4f5c\u8fd8\u539f\u5230\u4e8b\u52a1\u6267\u884c\u524d\u7684\u72b6\u6001\u3002\u6362\u53e5\u8bdd\u8bf4\uff0c\u5c31\u662f\u8981\u64a4\u9500\u5931\u8d25\u4e8b\u52a1\u5bf9\u5f53\u524d\u6570\u636e\u5e93\u9020\u6210\u7684\u5f71\u54cd\u3002\u6211\u4eec\u628a\u8fd9\u4e2a\u64a4\u9500\u7684\u8fc7\u7a0b\u79f0\u4e4b\u4e3a\u56de\u6eda\u3002\u5f53\u56de\u6eda\u64cd\u4f5c\u6267\u884c\u5b8c\u6bd5\u65f6\uff0c\u4e5f\u5c31\u662f\u6570\u636e\u5e93\u6062\u590d\u5230\u4e86\u6211\u4eec\u5c31\u8bf4\u8be5\u4e8b\u52a1\u5904\u5728\u4e86\u4e2d\u6b63\u7684\u72b6\u6001<\/p>\n\n\n\n
 \u63d0\u4ea4\u7684\uff08committed\uff09
\u5f53\u4e00\u4e2a\u5904\u5728\u90e8\u5206\u63d0\u4ea4\u7684\u72b6\u6001\u7684\u4e8b\u52a1\u5c06\u4fee\u6539\u8fc7\u7684\u6570\u636e\u90fd\u540c\u6b65\u5230\u78c1\u76d8\u4e0a\u4e4b\u540e\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u8bf4\u8be5\u4e8b\u52a1\u5904\u5728\u4e86\u63d0\u4ea4\u7684\u72b6\u6001\u3002<\/p>\n\n\n\n
\"\"<\/p>\n\n\n\n
#09-\u4e8b\u52a1\u7684\u57fa\u7840\u77e5\u8bc6\n\n#1.\u4e8b\u52a1\u7684\u5b8c\u6210\u8fc7\u7a0b\n#\u6b65\u9aa41\uff1a\u5f00\u542f\u4e8b\u52a1\n#\u6b65\u9aa42\uff1a\u4e00\u7cfb\u5217\u7684DML\u64cd\u4f5c \n#....\n#\u6b65\u9aa43\uff1a\u4e8b\u52a1\u7ed3\u675f\u7684\u72b6\u6001\uff1a\u63d0\u4ea4\u7684\u72b6\u6001(COMMIT) \u3001 \u4e2d\u6b62\u7684\u72b6\u6001(ROLLBACK)\n\n#2. \u663e\u5f0f\u4e8b\u52a1\n\n#2.1 \u5982\u4f55\u5f00\u542f\uff1f \u4f7f\u7528\u5173\u952e\u5b57\uff1astart transaction  \u6216 begin\n\n# start transaction \u540e\u9762\u53ef\u4ee5\u8ddf\uff1aread only \/ read write (\u9ed8\u8ba4) \/ \nwith consistent snapshot \n\n\n#2.2 \u4fdd\u5b58\u70b9(savepoint)\n\n#3. \u9690\u5f0f\u4e8b\u52a1<\/code><\/pre>\n\n\n\n
00:01 \u539f\u6587\uff1a \u5bf9\u5427\uff1f\u7136\u540e\u6700\u540e\u8fd9\u5757\u518d\u5230\u8fd9\u5757\uff0c\u5982\u679c\u6211\u662fcommit\u4e86\uff0c\u76f8\u5f53\u4e8e a\u662f\u4e0d\u662f\u4e00\u5171\u51cf\u4e86300\u5757\u94b1\uff0c\u8fd9\u4e2a\u65f6\u5019\u76f8\u5f53\u4e8e\u6301\u4e45\u5316\u4fdd\u5b58\u8d77\u6765\u4e86\uff0c\u5982\u679c\u8bf4\u6211\u4eec\u8981\u7528 rollback\u3002\u5927\u5bb6\u6ce8\u610f\u8fd9\u65f6\u5019\u4e2d\u95f4\u6211\u4eec\u8fd9\u65f6\u5019\u4f7f\u7528\u7684\u53ebstar\u7684transaction\uff0c\u6bd4\u5982\u8bf4\u662f\u5427\uff0c\u7136\u540e\u8fd9\u91cc\u8fb9\u64cd\u4f5c\u7684\u8bdd\uff0c\u4e2d\u95f4\u90fd\u4e0d\u4f1a\u6d89\u53ca\u5230\u4e8b\u7269\u7684\u4e00\u4e2a\u7ec8\u6b62\u7684\uff0c\u6211\u4eec\u8d70\u5230\u6700\u540e\u7684\u65f6\u5019\uff0c\u6211\u8981\u70b9 roll back\u7684\u8bdd\uff0c\u662f\u4e0d\u662f\u5c31\u56de\u5f52\u5230\u6211\u4eec\u6700\u521d\u7684\u72b6\u6001\u4e86\uff1f 00:22 \u539f\u6587\uff1a \u76f8\u5f53\u4e8e\u8fd9300\u5757\u94b1\u662f\u4e0d\u662f\u90fd\u6ca1\u6709\u51cf\uff1f\u90a3\u662f\u4e0d\u662f\u4f1a\u51fa\u73b0\u8fd9\u6837\u7684\u573a\u666f\uff1f\u5c31\u662f\u6211\u4eec\u4e2d\u95f4\u64cd\u4f5c\u65f6\u5019\u6709\u53ef\u80fd\u4f60\u4e00\u4e9b\u5931\u8bef\u5199\u9519\u4e86\uff0c\u4ec0\u4e48\u610f\u601d\uff1f\u4f60\u6bd4\u5982\u8bf4\u6211\u4eec\u51cf100\u5757\u94b1\uff0c\u7136\u540e\u63a5\u4e0b\u6765\u6211\u8981\u518d\u51cf100\u5757\u94b1\uff0c\u7ed3\u679c\u6211\u4e00\u4e0d\u5c0f\u5fc3\u5199\u6210\u52a0100\u4e86\uff0c\u5bf9\u5427\uff1f\u4e2d\u95f4\u4f60\u53ef\u80fd\u4f1a\u6709\u4e9b\u64cd\u4f5c\u5199\u9519\u4e86\u600e\u4e48\u529e\uff1f\u4f60\u8981\u4e00\u56de\u6eda\u7684\u8bdd\u662f\u4e0d\u662f\u5c31\u56de\u6eda\u5230\u6211\u4eec\u6700\u521d\u4f60\u53ef\u80fd\u505a\u4e86\u597d\u591a\u64cd\u4f5c\u4e86\uff0c\u4e00\u56de\u6eda\u662f\u4e0d\u662f\u56de\u6eda\u5230\u6700\u521d\u7684\u72b6\u6001\u4e86\uff1f\u4e2d\u95f4\u8fd9\u5757\u90fd\u767d\u505a\u4e86\u600e\u4e48\u529e\uff1f\u6211\u4eec\u5c31\u6709\u53ef\u80fd\u4f1a\u51fa\u73b0\u5728\u4f60\u8fd9\u51cf\u4e86100\u5757\u94b1\u4e4b\u540e\uff0c\u6211\u8fd9\u4e2a\u4f4d\u7f6e\u6211\u5c31\u53bb\u8bbe\u7f6e\u4e00\u4e2a Same point\uff0c\u6211\u5c31\u8bbe\u7acbsame point\uff0c\u5c31\u7b80\u5199\u4e86\u3002\u7533\u62a5\u6bd4\u5982\u53ebS\u4e00\u662f\u5427\uff1f\u6211\u5c31\u8bbe\u7f6e\u4e00\u4e2a\u4fdd\u5b58\u70b9\u4e86\uff0c\u7136\u540e\u7684\u8bdd\u4f60\u5199\u4e86\u4e2a\u52a0100\uff0c\u4e00\u770b\u5199\u9519\u4e86\u662f\u5427\uff1f 00:56 \u539f\u6587\uff1a \u4e0d\u5e94\u8be5\u52a0100\u7684\uff0c\u6211\u5e94\u8be5\u662f\u51cf100\u7684\u3002\u600e\u4e48\u529e\uff1f\u4f60\u8bb0\u4f4f\u5c31roll back to S\u4e00\u3002\u6211\u4e00roll back to S\u4e00\uff0c\u8fd9\u65f6\u5019\u76f8\u5f53\u4e8e\u4f60\u521a\u624d\u505a\u7684\u64cd\u4f5c\u5c31\u5931\u6548\u4e86\uff0c\u4f60\u5c31\u76f8\u5f53\u4e8e\u56de\u6eda\u5230\u6211\u4eec\u4fdd\u5b58\u70b9\u4e86\u3002 01:07 \u539f\u6587\uff1a \u56de\u5230\u8fd9\u4e2a\u4fdd\u5b58\u70b9\u6ce8\u610f\uff0c\u5927\u5bb6\u4e00\u5b9a\u8981\u6ce8\u610f\u8fd9\u4e2a\u65f6\u5019\u7684\u8bdd\u6211\u4eec\u7b97\u662f\u7ec8\u6b62\u7684\u72b6\u6001\u5417\uff1f\u4e0d\u662f\u7684\uff0c\u4f60\u8fd9\u4e2a\u72b6\u6001\u662f\u4e0d\u662f\u5e94\u8be5\u5728\u8fd9\uff0c\u4f60commit\u4e86\u6216\u8005\u662froll back\u4e86\uff0c\u6240\u4ee5\u8bf4\u6211\u4eec\u53ea\u662f\u56de\u6eda\u5230\u4fdd\u5b58\u70b9\u4ee5\u540e\uff0c\u4f60\u8fd8\u5f97\u63a5\u7740\u8003\u8651\uff0c\u4f60\u662f\u5230\u8fd9\u4ee5\u540e\u4f60\u662f\u8981roll back\uff0c\u4f60\u8fd8\u662f\u8981committee\u4f60\u8981commit\u8fd9\u5757\u76f8\u5f53\u4e8e\u4ed6\u81ea\u5df1\u72ec\u7acb\u7684\u5c31\u6784\u6210\u4e00\u4e2a\u4e8b\u7269\u4e86\u3002 01:23 \u539f\u6587\uff1a \u4f60\u8bf4\u4e0d\u884c\uff0c\u6211\u73b0\u5728\u8fd8\u63a5\u7740\u4e0b\u9762\u8fd8\u8981\u51cf\u884c\uff0c\u4f60\u5c31\u56de\u6eda\u5230\u6211\u4eec\u4fdd\u5b58\u70b9\u4ee5\u540e\uff0c\u4f60\u63a5\u7740\u518d\u53bb\u6361\u5c31\u5b8c\u4e86\u3002\u7136\u540e\u518d\u5f80\u540e\u8d70\uff0c\u4f60\u6700\u540e\u518d\u770b\u4f60\u662f\u8bb2\u5361\u7c73\u7279\u62c9\u8fd8\u662f\u8fd9\u4e2a\u697cback\u4e86\uff0c\u5927\u5bb6\u6ce8\u610f\u4e00\u4e0b\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u54b1\u4eec\u79c1\u4eba\u70ae\u7684\u8bdd\uff0c\u5b83\u4e0d\u662f\u54b1\u4eec\u4e8b\u7269\u7684\u4e00\u4e2a\u4f60\u6bd4\u5982\u8bf4no back to support\u4e0d\u662f\u6211\u4eec\u7684\u4e00\u4e2a\u6700\u7ec8\u7684\u72b6\u6001\uff0c\u5b83\u53ea\u662f\u4e2d\u95f4\u8fc7\u7a0b\u5f53\u4e2d\u65b9\u4fbf\u6211\u4eec\u5728\u64cd\u4f5c\u7684\u65f6\u5019\uff0c\u4f60\u6bd4\u5982\u8bf4\u54b1\u4eec\u4e00\u4e2a\u4e8b\u7269\u7684\u8bdd\uff0c\u4e2d\u95f4\u4f60\u8981\u64cd\u4f5c\u8fd9\u4e2a\u6b65\u9aa4\u975e\u5e38\u591a\uff0c\u8fd9\u4e48\u591a\u6784\u6210\u5728\u4e00\u8d77\u662f\u4e00\u4e2a\u4e8b\u7269\uff0c\u90a3\u4e0d\u6392\u9664\u6709\u53ef\u80fd\u4f60\u64cd\u4f5c\u4e86\u4e00\u534a\u7684\u65f6\u5019\u53ef\u80fd\u5199\u9519\u4e86\uff0c\u4f46\u662f\u8fd9\u65f6\u5019\u4f60\u8981\u56de\u6eda\u7684\u8bdd\uff0c\u4e4b\u524d\u505a\u7684\u90fd\u767d\u6574\u4e86\uff0c\u8fd8\u5f97\u91cd\u65b0\u6574\u4e00\u904d\uff0c\u4f60\u53ef\u4ee5\u6211\u8fd9\u4ee8\u6570\u90fd\u6ca1\u5199\u9519\uff0c\u6211\u5c31\u5148\u8bbe same part\uff0c\u7136\u540e\u4f60\u518d\u5f80\u4e0b\u5199\u9519\u7684\u8bdd\u4f60\u5c31\u56de\u6eda\u4e00\u4e0b\u5230\u8fd9\uff0c\u7136\u540e\u518d\u63a5\u7740\u690d\u5165\u518d\u5f80\u4e0b\u91cd\u5199\u3002 02:00 \u539f\u6587\uff1a \u5c31\u8fd9\u6837\u4e00\u4e2a\u76f8\u5f53\u4e8e\u4f18\u5316\u6211\u4eec\u64cd\u4f5c\u7684\u8fd9\u6837\u4e00\u4e2a\u529f\u80fd\u3002\u90a3\u4e48\u5982\u4f55\u53bb\u8bbe\u7f6e\u8fd9\u91cc\u8fb9\u4f60\u76f4\u63a5\u5199\u4e00\u4e0b\u53ebsame point\uff0c\u8d77\u4e2a\u540d\u5c31\u53ebS\u4e00\u5c31\u884c\u4e86\u3002\u540e\u8fb9\u4f60\u8981\u80fd\u7528\u5230\u7684\u8bdd\u4f60\u5c31roll back to IC\u3002\u5982\u679c\u8bf4\u4f60\u4fdd\u9001\u70b9\u4e86\u6ca1\u6709\u7528\u4e86\uff0c\u8fd9\u53ebrelease same point IC\u3002\u8fd9\u5c31\u5173\u4e8e\u6211\u4eec\u4fdd\u5b58\u70b9\u5b83\u7684\u4e00\u4e2a\u4f7f\u7528\uff0c\u6211\u5c31\u8bf4\u6e05\u695a\u4e86\u3002\u597d\uff0c\u90a3\u4e48\u5173\u4e8e\u6211\u4eec\u8fd9\u5757\u5176\u5b9e\u5c31\u6ca1\u5565\u4e86\uff0c\u8fd9\u53eb\u663e\u793a\u7684\u4e8b\u7269\u3002\u597d\uff0c\u4e0b\u8fb9\u7684\u8bdd\u6211\u4eec\u518d\u770b\u4e00\u770b\uff0c\u8fd9\u53eb\u6f14\u793a\u7684\u5931\u8bef\u3002\u63a9\u9970\u5931\u8bef\u5176\u5b9e\u6211\u4eec\u5728\u524d\u9762\u8bb2\u7684\u7a97K\u7684table\u8bb2\u5230 Delete from\u7684\u65f6\u5019\uff0c\u5f53\u65f6\u5176\u5b9e\u54b1\u4eec\u7528\u7684\u53eb\u996e\u98df\u98df\u7269\u4e86\uff0c\u56e0\u4e3a\u54b1\u4eec\u8bf4\u98df\u7269\u5b83\u662f\u4e0d\u662f\u6709\u5f00\u542f\u4e4b\u8bf4\uff1f 02:35 \u539f\u6587\uff1a \u8fd8\u6709\u7ed3\u675f\u4e4b\u8bf4\u662f\u5427\uff1f\u7136\u540e\u7ed3\u675f\u7684\u8bdd\u6211\u4eec\u90fd\u662f\u8fd9\u6837\u6765\u53bb\u4f53\u73b0\u7684\uff0c\u54b1\u4eec\u5f53\u65f6\u5f00\u542f\u7684\u65f6\u5019\u53ef\u6ca1\u6709\u7528\u8fc7 star\u7684\u4ea7\u8d5b\u8bfe\u7a0b\u6216\u8005\u6bd4\u62fc\uff0c\u5bf9\u5427\uff1f\u8fd8\u662f\u6ca1\u6709\u7684\u3002\u884c\uff0c\u5f71\u89c6\u4e8b\u52a1\u8fd9\u5757\u6211\u4eec\u9996\u5148\u5c31\u63d0\u5230\u4e00\u4e2a\u5173\u952e\u5b57\uff0c\u8fd9\u4e2a\u5173\u952e\u5b57\u662f\u4e0d\u662f\u53eb\u505a auto commit\u662f\u5427\uff1f\u5173\u952e\u5b57\uff0c auto commit\u3002\u5927\u5bb6\u8fd8\u8bb0\u5f97\u4ee5\u524d\u6211\u4eec\u662f\u4e0d\u662f\u505a\u8fc7\u8fd9\u6837\u64cd\u4f5c\uff0c\u6211\u8bb2\u7684\u53ebauto Commit\uff0c\u662f\u4e0d\u662f\u6211\u4eec\u6539\u6210\u662f\u4e00\u4e2afalse\u4e86\uff1f\u662f\u5427\uff1f\u5f53\u521d\u6211\u4eec\u505a\u8fc7\u8fd9\u6837\u7684\u884c\u4e3a\uff0c\u9996\u5148\u8fd9\u662f\u6211\u4eec\u5bf9\u5e94\u7684\u4e00\u4e2a\u53d8\u91cf\uff0c\u6211\u4eec\u53ef\u4ee5\u62ff\u53d7 variables. \u7136\u540e Like\u6211\u4eec\u8fd9\u8fb9\u5199\u4e00\u4e0b\u53ebauto\uff0c\u624dcommit\u3002 03:11 \u539f\u6587\uff1a 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false\u7684\u72b6\u6001\uff0c\u54b1\u5c31\u81ea\u5df1\u4e3b\u52a8\u60f3\u542f\u52a8\u4e8b\u7269\uff0c\u4f60\u5c31\u7528\u8fd9\u6837\u53bb\u5199\uff0c\u63a5\u53d7\u4e8b\u7269\u4f60\u5c31\u770b\u4f60\u6700\u540e\u662f\u63d0\u4ea4\u8fd8\u662f\u56de\u6eda\u5c31\u53ef\u4ee5\u4e86\u3002 06:51 \u539f\u6587\uff1a \u597d\uff0c\u8fd9\u6837\u5c31\u6211\u4eec\u8bf4\u7684\u8fd9\u4e2a\u70b9\uff0c\u7136\u540e\u56de\u8fc7\u6765\u6211\u4eec\u518d\u8bf4\u4e00\u4e0b\u4ec0\u4e48\uff0c\u8bf4\u5f71\u89c6\u7684\u5c31\u4f1a\u628a\u8fd9\u4e2a\u6570\u636e\u505a\u4e00\u4e2a\u63d0\u4ea4\uff0c\u884c\u4e3a\u90fd\u6709\u54ea\u4e9b\uff1f\u5176\u5b9e\u54b1\u4eec\u524d\u9762\u8bb2\u5230\u521b\u5efa\u8868\uff0c\u7ba1\u7406\u8868\u7684\u65f6\u5019\u63d0\u5230\u8fc7\uff0c\u5305\u62ec\u7a97\u53e3\u7684table\u662f\u4e0d\u662f\u5c31\u5c5e\u4e8e\u4f4e\u8c03\u64cd\u4f5c\u4e86\u5bf9\u5427\uff1f\u5b83\u4f1a\u81ea\u52a8\u7684\u63d0\u4ea4\u6570\u636e\u7684\uff0c\u8bf4\u54ea\u4e9b\u884c\u4e3a\u4f1a\u5bfc\u81f4\u6211\u4eec\u6709\u54ea\u4e9b\u884c\u4e3a\u662f\u6f14\u793a\u7684\uff0c\u5927\u6570\u636e\u5c31\u4e00\u5b9a\u4f1a\u63d0\u4ea4\u3002\u6768\u827e\u8fea\u4ed6\u5c31\u4e0d\u53d7\u6211\u4eec\u5965\u62d3commit\u4e00\u4e2a\u63a7\u5236\u4e86\uff0c\u6709\u8fd9\u6837\u7684\u4e00\u4e9b\u7b2c\u4e00\u4e2a\u53eb\u6570\u636e\u5b9a\u8bed\u8a00\uff0c\u5c31\u6211\u4eec\u6240\u8c13\u7684\u53eb\u4f4e\u8c03\uff0c\u5927\u5bb6\u90fd\u6e05\u695a\u6211\u5c31\u4e0d\u591a\u8bf4\u4e86\u3002 07:21 \u539f\u6587\uff1a \u7136\u540e\u4e0b\u9762\u53eb\u9690\u58eb\u7684\u4f7f\u7528\uff0c\u6216\u8005\u662f\u4fee\u6539\u9ea6\u65af\u5e93\u6570\u636e\u5e93\u3001\u4e2d\u7684\u3001\u8868\u3002\u9488\u5bf9\u6570\u636e\u4e2d\u7684\u8868\uff0c\u6bd4\u5982auto user\uff0c\u8fd8\u60f3\u4fee\u6539\u7528\u6237\u3002Create user job user, \u4e0d\u8ba9\u4ed6rename user a revoke set password\u3002\u8fd9\u6837\u7684\u4e00\u4e9b\u64cd\u4f5c\uff0c\u5bf9\u5427\uff1f\u9488\u5bf9\u7528\u6237\u7684\u4e00\u4e9b\u64cd\u4f5c\uff0c\u9488\u5bf9\u6211\u4eec\u8d4b\u4e88\u6743\u9650\u56de\u6536\u6743\u9650\u7684\u8fd9\u6837\u4e00\u7cfb\u5217\u7684\u64cd\u4f5c\uff0c\u8fd9\u4e9b\u7684\u8bdd\u4e5f\u662f\u4f1a\u81ea\u52a8\u7684\u63d0\u4ea4\u6570\u636e\u7684\u3002 07:42 \u539f\u6587\uff1a \u4f60\u5373\u4f7f\u6709\u8fd9\u6837\u4e00\u4e2a\u64cd\u4f5c\u4e5f\u767d\u626f\u662f\u5427\uff1f\u597d\uff0c\u8fd9\u662f\u4e00\u6ce2\u3002\u8fd8\u6709\u4e00\u6ce2\u7684\u8bdd\u662f\u8fd9\u6837\u4e00\u4e2a\u573a\u666f\uff0c\u5927\u5bb6\u6709\u53ef\u80fd\u4ee5\u540e\u4f1a\u9047\u5230\u54b1\u4eec\u5199\u4e86\u4e00\u4e2abegin\uff0c\u7136\u540e\u5199\u4e86\u4e00\u4e2a\u589e\u5220\u6539\u64cd\u4f5c\u5bf9\u5427\uff1f\u6b63\u5e38\u7684\u4e8b\u6545\u6211\u4eec\u73b0\u5728\u6b63\u6267\u884c\uff0c\u4f46\u662f\u6211\u4eec\u6ca1\u6709\u5199commit\u4e5f\u6ca1\u6709\u5199rollback\uff0c\u7136\u540e\u7d27\u63a5\u7740\u4f60\u53c8\u5199\u4e86\u4e2aPK\uff0c\u90a3\u65f6\u5019\u5c31\u5f97\u8bf4\u4f60\u4e8b\u52a1\u8fd8\u6ca1\u5b8c\u4e8b\uff0c\u53c8\u5f00\u51e0\u4e2a\u5931\u8bef\u600e\u4e48\u529e\u5462\uff1f 08:03 \u539f\u6587\uff1a \u8fd9\u4e2a\u65f6\u5019\u6211\u4eec\u8bf4\u4e0a\u9762\u8fd9\u4e2a\u4e8b\u7269\u5b83\u5c31\u81ea\u52a8\u7684\u5c31\u63d0\u4ea4\u4e86\uff0c\u8fd9\u4e2a\u4e8b\u7269\u5c31\u81ea\u52a8\u7684\u5c31\u63d0\u4ea4\u4e86\uff0c\u6211\u4eec\u4e5f\u6210\u4e3a\u53eb\u6f14\u793a\u7684\u5c31\u63d0\u4ea4\u4e86\u3002\u5927\u5bb6\u8981\u6ce8\u610f\u4e00\u4e0b\uff0c\u8fd9\u662f\u6211\u4eec\u8bf4\u7684\u4e00\u4e2a\u4e8b\u3002\u7136\u540e\u4e0b\u8fb9\u5c31\u662f\u5f53\u524d\u7684\u5965\u7279\u79d1\u5bc6\u7684\u7cfb\u7edf\u53d8\u91cf\u53ea\u80fd\u4e3afalse\uff0c\u5f53\u6211\u4eec\u624b\u52a8\u7684\u628a\u5b83\u8c03\u6210on\u7684\u65f6\u5019\uff0c\u4e5f\u4f1a\u6f14\u793a\u7684\u63d0\u4ea4\u54b1\u4eec\u524d\u8fb9\u7684\u6240\u5c5e\u7684\u4e8b\u7269\u3002\u4f60\u5c31\u597d\u6bd4\u662f\u6211\u4eec\u8fd9\u5757\uff0c\u54b1\u4eec\u662f\u8fd9\u4e2a\u65b9\u5f0f\u4e00\u662f\u5427\uff1f\u8d5b\u9053\u5965\u7279commit\u7b49\u4e8eforce\u4e86\uff0c\u6267\u884c\u5b8c\u4ee5\u540e\u7684\u8bdd\uff0c\u6211\u4eec\u8fd9\u5757\u6267\u884c\u4e00\u6267\u884c\u4e86\u4e00\u6761\uff0c\u7136\u540e\u53c8\u5199\u4e86\u4e00\u4e2a\uff0c\u8fd9\u4e2a\u53c8\u5199 update\u4e4b\u524d\u6211\u4eec\u76f8\u5f53\u4e8e\u662f\u8d5b\u9053\u7684commit\uff0c\u6211\u628a\u8fd9\u4e2a\u5c31set out auto commit\u7b49\u4e8e\u51fa\u4e86\uff0c\u4f60\u4e00\u65e6\u5199\u6210\u5904\u524d\u9762\u8fd9\u4e24\u4e2a\u4f9d\u636e\u5c31\u63d0\u4ea4\u4e86\uff0c\u5c31\u662f\u8fd9\u4e2a\u4f5c\u7528\u3002 08:42 \u539f\u6587\uff1a \u884c\uff0c\u5c31\u8fd9\u610f\u601d\uff0c\u7136\u540e\u4e0b\u8fb9\u7684\u8bdd\u8bf4\u4f7f\u7528 log tables\u6216\u8005unlock tables\u9501\u5b9a\u8868\u6216\u8005\u8bf4\u89e3\u9501\u8868\uff0c\u8fd9\u4e2a\u65f6\u5019\u4e5f\u4f1a\u9690\u8eab\u7684\u63d0\u4ea4\uff0c\u8fd9\u4e2a\u662f\u6ce8\u610f\u4e00\u4e0b\u3002 08:49 \u539f\u6587\uff1a \u53e6\u5916\u5c31\u662f\u6211\u4eec\u4f7f\u7528\u53ebload data\uff0c load data\u7684\u65b9\u5f0f\u6765\u6279\u91cf\u7684\u5f80\u6570\u636e\u5e93\u4e2d\u53bb\u5bfc\u5165\u6570\u636e\u7684\u65f6\u5019\uff0c\u4e5f\u4f1a\u6f14\u793a\u5728\u63d0\u4ea4\u4e4b\u524d\u7684\u3002\u7136\u540e\u518d\u8005\u5c31\u5173\u4e8e\u9ea6\u65af\u514b\u590d\u5236\u7684\u4e00\u4e9b\u8bed\u53e5\uff0c\u6bd4\u5982\u5341\u5927\u7684slave stop slave recess\uff0cslave change master two\uff0c\u6211\u4eec\u540e\u8fb9\u8bb2\u5230\u4e3b\u4ece\u590d\u5236\u7684\u65f6\u5019\u4f1a\u6709\u8fd9\u6837\u7684\u4e00\u4e9b\u64cd\u4f5c\u884c\u4e3a\uff0c\u5b83\u4eec\u4e5f\u4f1a\u5bfc\u81f4\u7406\u4e8b\u7684\u63d0\u4ea4\u524d\u9762\u6240\u505a\u7684\u4e8b\u7269\u3002\u8fd8\u6bd4\u5982\u8bf4\u6211\u4eec\u524d\u9762\u63d0\u5230\u8fc7\u7684\u4e0a\u4e00\u7ae0\u8bb2\u7684\u53eb\u5206\u6790\u8868\uff0c\u662f\u5427\uff1f\u68c0\u67e5\u8868\u8fd8\u6709\u4f18\u5316\u8868\u8fd9\u6837\u7684\u4e00\u4e9b\u884c\u4e3a\uff0c\u8fd9\u4e9b\u884c\u4e3a\u7684\u8bdd\u4e5f\u4f1a\u53bb\u996e\u98df\u7684\u63d0\u4ea4\uff0c\u524d\u9762\u6211\u4eec\u505a\u7684\u8fd9\u6837\u7684\u4e00\u4e9b\u4e8b\u7269\u7684\u884c\u4e3a\u3002 09:22 \u539f\u6587\uff1a \u7b80\u5355\u6765\u8bb2\u7684\u8bdd\uff0c\u76f8\u5f53\u4e8e\u662f\u6211\u4eec\u662f\u4e0d\u662f\u4e3b\u8981\u9488\u5bf9\u7684\u662f dml\u64cd\u4f5c\u662f\u5427\uff1f\u8fd9\u4e2a\u64cd\u4f5c\u7684\u8bdd\u662f\u53d7\u6211\u4eec\u53eb\u5965\u6258\u514b\u5229\u7279\u8fd9\u6837\u7684\u4e00\u4e2a\u53d8\u91cf\u7684\u5f71\u54cd\u7684\uff0c\u8fd9\u6837\u53d8\u91cf\u7684\u5f71\u54cd\u7684\u8fd9\u5757\u5927\u5bb6\u4e3b\u8981\u6ce8\u610f\u4e00\u4e0b\u8fd9\u4e2a\u4e8b\u3002 09:35 \u539f\u6587\uff1a \u597d\uff0c\u5173\u4e8e\u663e\u793a\u4e8b\u7269\u9690\u79c1\u4e8b\u7269\u6211\u4eec\u5c31\u5148\u8bf4\u5230\u8fd9\u3002 <\/p>\n\n\n\n
# 3.1 \u5173\u952e\u5b57\uff1aautocommit \n#set autocommit = false;\n\nSHOW VARIABLES LIKE 'autocommit';#\u9ed8\u8ba4\u662fON \u4f60\u901a\u8fc7show value\u5373\u53ef\u770b\u5230\u5df2\u7ecf\u662fOFF\u4e86\n\nUPDATE account SET balance = balance - 10 WHERE id = 1; #\u6b64\u65f6\u8fd9\u6761DML\u64cd\u4f5c\u662f\u4e00\u4e2a\u72ec\u7acb\u7684\u4e8b\u52a1\n\nUPDATE account SET balance = balance + 10 WHERE id = 2; #\u6b64\u65f6\u8fd9\u6761DML\u64cd\u4f5c\u662f\u4e00\u4e2a\u72ec\u7acb\u7684\u4e8b\u52a1\n<\/code><\/pre>\n\n\n\n
#3.2 \u5982\u679c\u5173\u95ed\u81ea\u52a8\u63d0\u4ea4\uff1f\n#\u65b9\u5f0f1\uff1a\nSET autocommit = FALSE; #\u9488\u5bf9\u4e8eDML\u64cd\u4f5c\u662f\u6709\u6548\u7684\uff0c\u5bf9DDL\u64cd\u4f5c\u662f\u65e0\u6548\u7684\u3002\n\nUPDATE account SET balance = balance - 10 WHERE id = 1;\n\nUPDATE account SET balance = balance + 10 WHERE id = 2; \n\nCOMMIT; #\u6216rollback;\n\n#\u65b9\u5f0f2\uff1a\u6211\u4eec\u5728autocommit\u4e3atrue\u7684\u60c5\u51b5\u4e0b\uff0c\u4f7f\u7528start transaction \u6216begin\u5f00\u542f\u4e8b\u52a1\uff0c\u90a3\u4e48DML\u64cd\u4f5c\u5c31\u4e0d\u4f1a\u81ea\u52a8\u63d0\u4ea4\u6570\u636e\n\nSTART TRANSACTION;\n\nUPDATE account SET balance = balance - 10 WHERE id = 1;\n\nUPDATE account SET balance = balance + 10 WHERE id = 2; \n\nCOMMIT; #\u6216rollback;\n<\/code><\/pre>\n\n\n\n
UPDATE account SET balance = balance - 10 WHERE id = 1;
UPDATE account SET balance =balance+10 WHERE id=2;<\/p>\n\n\n\n
\u5f53\u7136\uff0c\u5982\u679c\u6211\u4eec\u60f3\u5173\u95ed\u8fd9\u79cd\u81ea\u52a8\u63d0\u4ea4\u7684\u529f\u80fd\uff0c\u53ef\u4ee5\u4f7f\u7528\u4e0b\u8fb9\u4e24\u79cd\u65b9\u6cd5\u4e4b\u4e00\uff1a
\u00b7\u663e\u5f0f\u7684\u7684\u4f7f\u7528STARTTRANSACTION\u6216\u8005BEGIN\u8bed\u53e5\u5f00\u542f\u4e00\u4e2a\u4e8b\u52a1\u3002\u8fd9\u6837\u5728\u672c\u6b21\u4e8b\u52a1\u63d0\u4ea4\u6216\u8005\u56de\u6eda\u524d\u4f1a\u6682\u65f6\u5173\u95ed\u6389\u81ea\u52a8\u63d0\u4ea4\u7684\u529f\u80fd\u3002
\u00b7\u628a\u7cfb\u7edf\u53d8\u91cfautocommit\u7684\u503c\u8bbe\u7f6e\u4e3aOFF\uff0c\u5c31\u50cf\u8fd9\u6837\uff1a
SET autocommit= OFF;
#\u6216
SET autocommit = 0;<\/p>\n\n\n\n
\u8fd9\u6837\u7684\u8bdd\uff0c\u6211\u4eec\u5199\u5165\u7684\u591a\u6761\u8bed\u53e5\u5c31\u7b97\u662f\u5c5e\u4e8e\u540c\u4e00\u4e2a\u4e8b\u52a1\u4e86\uff0c\u76f4\u5230\u6211\u4eec\u663e\u5f0f\u7684\u5199\u51faCOMMIT\u8bed\u53e5\u6765\u628a\u8fd9\u4e2a\u4e8b\u52a1\u63d0\u4ea4\u6389\uff0c\u6216\u8005\u663e\u5f0f\u7684\u5199\u51faROLLBACK\u8bed\u53e5\u6765\u628a\u8fd9\u4e2a\u4e8b\u52a1\u56de\u6eda\u6389\u3002
\u8865\u5145\uff1aOracle\u9ed8\u8ba4\u4e0d\u81ea\u52a8\u63d0\u4ea4\uff0c\u9700\u8981\u624b\u5199COMMIT\u547d\u4ee4\uff0c\u800cMySQL\u9ed8\u8ba4\u81ea\u52a8\u63d0\u4ea4\u3002 <\/p>\n\n\n\n
2.3 \u9690\u5f0f\u63d0\u4ea4\u6570\u636e\u7684\u60c5\u51b5<\/h3>\n\n\n\n
\u6570\u636e\u5b9a\u4e49\u8bed\u8a00\uff08Data definition language\uff0c\u7f29\u5199\u4e3a\uff1aDDL)<\/p>\n\n\n\n
\u6570\u636e\u5e93\u5bf9\u8c61\uff0c\u6307\u7684\u5c31\u662f\u6570\u636e\u5e93\u3001\u8868\u3001\u89c6\u56fe\u3001\u5b58\u50a8\u8fc7\u7a0b\u7b49\u7ed3\u6784\u3002\u5f53\u6211\u4eec\u4f7f\u7528CREATE\u3001ALTER\u3001DROP\u7b49\u8bed\u53e5<\/p>\n\n\n\n
\u53bb\u4fee\u6539\u6570\u636e\u5e93\u5bf9\u8c61\u65f6\uff0c\u5c31\u4f1a\u9690\u5f0f\u7684\u63d0\u4ea4\u524d\u8fb9\u8bed\u53e5\u6240\u5c5e\u4e8e\u7684\u4e8b\u52a1\u3002\u5373\uff1a<\/p>\n\n\n\n
BEGIN;\nSELECT..\uff0e#\u4e8b\u52a1\u4e2d\u7684\u4e00\u6761\u8bed\u53e5\nUPDATE..\uff0e#\u4e8b\u52a1\u4e2d\u7684\u4e00\u6761\u8bed\u53e5\n\uff0e#\u4e8b\u52a1\u4e2d\u7684\u5176\u5b83\u8bed\u53e5\nCREATETABLE\u00b7\u00b7\uff1a#\u6b64\u8bed\u53e5\u4f1a\u9690\u5f0f\u7684\u63d0\u4ea4\u524d\u8fb9\u8bed\u53e5\u6240\u5c5e\u4e8e\u7684\u4e8b\u52a1<\/code><\/pre>\n\n\n\n
\u00b7\u9690\u5f0f\u4f7f\u7528\u6216\u4fee\u6539mysql\u6570\u636e\u5e93\u4e2d\u7684\u8868
\u5f53\u6211\u4eec\u4f7f\u7528ALTER USER\u3001CREATE USER\u3001DROP USER\u3001GRANT\u3001RENAME USER\u3001REVOKE\u3001SETI
PASSWORD\u7b49\u8bed\u53e5\u65f6\u4e5f\u4f1a\u9690\u5f0f\u7684\u63d0\u4ea4\u524d\u8fb9\u8bed\u53e5\u6240\u5c5e\u4e8e\u7684\u4e8b\u52a1\u3002
\u00b7\u4e8b\u52a1\u63a7\u5236\u6216\u5173\u4e8e\u9501\u5b9a\u7684\u8bed\u53e5
\u2460\u5f53\u6211\u4eec\u5728\u4e00\u4e2a\u4e8b\u52a1\u8fd8\u6ca1\u63d0\u4ea4\u6216\u8005\u56de\u6eda\u65f6\u5c31\u53c8\u4f7f\u7528STARTTRANSACTION\u6216\u8005BEGIN\u8bed\u53e5\u5f00\u542f\u4e86\u53e6\u4e00\u4e2a\u4e8b\u52a1
\u65f6\uff0c\u4f1a\u9690\u5f0f\u7684\u63d0\u4ea4\u4e0a\u4e00\u4e2a\u4e8b\u52a1\u3002\u5373\uff1a<\/p>\n\n\n\n
BEGIN;\nSELECT..\uff0e#\u4e8b\u52a1\u4e2d\u7684\u4e00\u6761\u8bed\u53e5\nUPDATE..\uff0e#\u4e8b\u52a1\u4e2d\u7684\u4e00\u6761\u8bed\u53e5\n.\uff0e#\u4e8b\u52a1\u4e2d\u7684\u5176\u5b83\u8bed\u53e5\nBEGIN\uff1b#\u6b64\u8bed\u53e5\u4f1a\u9690\u5f0f\u7684\u63d0\u4ea4\u524d\u8fb9\u8bed\u53e5\u6240\u5c5e\u4e8e\u7684\u4e8b\u52a1<\/code><\/pre>\n\n\n\n
\u2461\u5f53\u524d\u7684autocommit\u7cfb\u7edf\u53d8\u91cf\u7684\u503c\u4e3aOFF\uff0c\u6211\u4eec\u624b\u52a8\u628a\u5b83\u8c03\u4e3aoN\u65f6\uff0c\u4e5f\u4f1a\u9690\u5f0f\u7684\u63d0\u4ea4\u524d\u8fb9\u8bed\u53e5\u6240\u5c5e\u7684\u4e8b\u52a1\u3002
\u2462\u4f7f\u7528LOCKTABLES\u3001UNLOCKTABLES\u7b49\u5173\u4e8e\u9501\u5b9a\u7684\u8bed\u53e5\u4e5f\u4f1a\u9690\u5f0f\u7684\u63d0\u4ea4\u524d\u8fb9\u8bed\u53e5\u6240\u5c5e\u7684\u4e8b\u52a1\u3002
\u00b7\u52a0\u8f7d\u6570\u636e\u7684\u8bed\u53e5
\u4f7f\u7528LOADDATA\u8bed\u53e5\u6765\u6279\u91cf\u5f80\u6570\u636e\u5e93\u4e2d\u5bfc\u5165\u6570\u636e\u65f6\uff0c\u4e5f\u4f1a\u9690\u5f0f\u7684\u63d0\u4ea4\u524d\u8fb9\u8bed\u53e5\u6240\u5c5e\u7684\u4e8b\u52a1\u3002
\u00b7\u5173\u4e8eMySQL\u590d\u5236\u7684\u4e00\u4e9b\u8bed\u53e5
\u4f7f\u7528START SLAVE\u3001STOP SLAVE\u3001RESET SLAVE\u3001CHANGE MASTER TO\u7b49\u8bed\u53e5\u65f6\u4f1a\u9690\u5f0f\u7684\u63d0\u4ea4\u524d\u8fb9\u8bed\u53e5\u6240\u5c5e\u7684\u4e8b\u52a1\u3002
PML\u53d7otto commit\u7684\u503c\u5f71\u54cd<\/p>\n\n\n\n
BEGIN;\nSELECT.\uff0e#\u4e8b\u52a1\u4e2d\u7684\u4e00\u6761\u8bed\u53e5\nUPDATE..\uff0e#\u4e8b\u52a1\u4e2d\u7684\u4e00\u6761\u8bed\u53e5\n.\uff0e#\u4e8b\u52a1\u4e2d\u7684\u5176\u5b83\u8bed\u53e5 <\/code><\/pre>\n\n\n\n
2.4 \u4f7f\u7528\u4e3e\u4f8b1\uff1a\u63d0\u4ea4\u4e0e\u56de\u6eda <\/h3>\n\n\n\n
#4. \u6848\u4f8b\u5206\u6790\n#SET autocommit = TRUE; \n#\u4e3e\u4f8b1\uff1a commit \u548c rollback\n\nUSE atguigudb2;\n#\u60c5\u51b51\uff1a\nCREATE TABLE user3(NAME VARCHAR(15) PRIMARY KEY);\n\nSELECT * FROM user3;\n\nBEGIN;\nINSERT INTO user3 VALUES('\u5f20\u4e09'); #\u6b64\u65f6\u4e0d\u4f1a\u81ea\u52a8\u63d0\u4ea4\u6570\u636e\nCOMMIT;\n\nBEGIN; #\u5f00\u542f\u4e00\u4e2a\u65b0\u7684\u4e8b\u52a1\nINSERT INTO user3 VALUES('\u674e\u56db'); #\u6b64\u65f6\u4e0d\u4f1a\u81ea\u52a8\u63d0\u4ea4\u6570\u636e\nINSERT INTO user3 VALUES('\u674e\u56db'); #\u53d7\u4e3b\u952e\u7684\u5f71\u54cd\uff0c\u4e0d\u80fd\u6dfb\u52a0\u6210\u529f\nROLLBACK;\n\nSELECT * FROM user3;<\/code><\/pre>\n\n\n\n
03.03--03.25-05.30 <\/p>\n\n\n\n
#\u60c5\u51b52\uff1a\nTRUNCATE TABLE user3;  #DDL\u64cd\u4f5c\u4f1a\u81ea\u52a8\u63d0\u4ea4\u6570\u636e\uff0c\u4e0d\u53d7autocommit\u53d8\u91cf\u7684\u5f71\u54cd\u3002\n\nSELECT * FROM user3;\n\nBEGIN;\nINSERT INTO user3 VALUES('\u5f20\u4e09'); #\u6b64\u65f6\u4e0d\u4f1a\u81ea\u52a8\u63d0\u4ea4\u6570\u636e\nCOMMIT;\n\nINSERT INTO user3 VALUES('\u674e\u56db');# \u9ed8\u8ba4\u60c5\u51b5\u4e0b(\u5373autocommit\u4e3atrue)\uff0cDML\u64cd\u4f5c\u4e5f\u4f1a\u81ea\u52a8\u63d0\u4ea4\u6570\u636e\u3002\nINSERT INTO user3 VALUES('\u674e\u56db'); #\u4e8b\u52a1\u7684\u5931\u8d25\u7684\u72b6\u6001\n\nROLLBACK;\n\nSELECT * FROM user3;\n\n\n#\u60c5\u51b53\uff1a\nTRUNCATE TABLE user3;\n\nSELECT * FROM user3;\n\nSELECT @@completion_type;\n\nSET @@completion_type = 1;\n\nBEGIN;\nINSERT INTO user3 VALUES('\u5f20\u4e09'); \nCOMMIT;\n\n\nSELECT * FROM user3;\n\nINSERT INTO user3 VALUES('\u674e\u56db');\nINSERT INTO user3 VALUES('\u674e\u56db'); \n\nROLLBACK;\n\n\nSELECT * FROM user3;<\/code><\/pre>\n\n\n\n
\u60c5\u51b5\u4e8c\uff1a08.22\u5f00\u59cb<\/p>\n\n\n\n
\u60c5\u51b5\u4e09\uff1a10.20-12.20<\/p>\n\n\n\n
14.10--14.30<\/p>\n\n\n\n
#\u4e3e\u4f8b2\uff1a\u4f53\u4f1aINNODB \u548c MyISAM\n\nCREATE TABLE test1(i INT) ENGINE = INNODB;\n\nCREATE TABLE test2(i INT) ENGINE = MYISAM;\n\n#\u9488\u5bf9\u4e8einnodb\u8868\nBEGIN\nINSERT INTO test1 VALUES (1);\nROLLBACK;\n\nSELECT * FROM test1;\n\n\n#\u9488\u5bf9\u4e8emyisam\u8868:\u4e0d\u652f\u6301\u4e8b\u52a1\nBEGIN\nINSERT INTO test2 VALUES (1);\nROLLBACK;\n\nSELECT * FROM test2;\n\n\n#\u4e3e\u4f8b3\uff1a\u4f53\u4f1asavepoint\n\nCREATE TABLE user3(NAME VARCHAR(15),balance DECIMAL(10,2));\n\nBEGIN\nINSERT INTO user3(NAME,balance) VALUES('\u5f20\u4e09',1000);\nCOMMIT;\n\nSELECT * FROM user3;\n\n\nBEGIN;\nUPDATE user3 SET balance = balance - 100 WHERE NAME = '\u5f20\u4e09';\n\nUPDATE user3 SET balance = balance - 100 WHERE NAME = '\u5f20\u4e09';\n\nSAVEPOINT s1;#\u8bbe\u7f6e\u4fdd\u5b58\u70b9\n\nUPDATE user3 SET balance = balance + 1 WHERE NAME = '\u5f20\u4e09';\n\nROLLBACK TO s1; #\u56de\u6eda\u5230\u4fdd\u5b58\u70b9\n\n\nSELECT * FROM user3;\n\nROLLBACK; #\u56de\u6eda\u64cd\u4f5c\n\nSELECT * FROM user3;\n<\/code><\/pre>\n\n\n\n
\u4e3e\u4f8b\u4e8c\uff1a16.50--18.20<\/p>\n\n\n\n
\u4e3e\u4f8b\u4e09\uff1a23.28<\/p>\n\n\n\n
3.\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b<\/h2>\n\n\n\n
MySQL\u662f\u4e00\u4e2a\u5ba2\u6237\u7aef\uff0f\u670d\u52a1\u5668\u67b6\u6784\u7684\u8f6f\u4ef6\uff0c\u5bf9\u4e8e\u540c\u4e00\u4e2a\u670d\u52a1\u5668\u6765\u8bf4\uff0c\u53ef\u4ee5\u6709\u82e5\u5e72\u4e2a\u5ba2\u6237\u7aef\u4e0e\u4e4b\u8fde\u63a5\uff0c\u6bcf\u4e2a\u5ba2\u6237\u7aef\u4e0e\u670d\u52a1\u5668\u8fde\u63a5\u4e0a\u4e4b\u540e\uff0c\u5c31\u53ef\u4ee5\u79f0\u4e3a\u4e00\u4e2a\u4f1a\u8bdd\uff08Session\uff09\u3002\u6bcf\u4e2a\u5ba2\u6237\u7aef\u90fd\u53ef\u4ee5\u5728\u81ea\u5df1\u7684\u4f1a\u8bdd\u4e2d\u5411\u670d\u52a1\u5668\u53d1\u51fa\u8bf7\u6c42\u8bed\u53e5\uff0c\u4e00\u4e2a\u8bf7\u6c42\u8bed\u53e5\u53ef\u80fd\u662f\u67d0\u4e2a\u4e8b\u52a1\u7684\u4e00\u90e8\u5206\uff0c\u4e5f\u5c31\u662f\u5bf9\u4e8e\u670d\u52a1\u5668\u6765\u8bf4\u53ef\u80fd\u540c\u65f6\u5904\u7406\u591a\u4e2a\u4e8b\u52a1\u3002\u4e8b\u52a1\u6709\u9694\u79bb\u6027\u7684\u7279\u6027\uff0c\u7406\u8bba\u4e0a\u5728\u67d0\u4e2a\u4e8b\u52a1\u5bf9\u67d0\u4e2a\u6570\u636e\u8fdb\u884c\u8bbf\u95ee\u65f6\uff0c\u5176\u4ed6\u4e8b\u52a1\u5e94\u8be5\u8fdb\u884c\u6392\u961f\uff0c\u5f53\u8be5\u4e8b\u52a1\u63d0\u4ea4\u4e4b\u540e\uff0c\u5176\u4ed6\u4e8b\u52a1\u624d\u53ef\u4ee5\u7ee7\u7eed\u8bbf\u95ee\u8fd9\u4e2a\u6570\u636e\u3002\u4f46\u662f\u8fd9\u6837\u5bf9\u6027\u80fd\u5f71\u54cd\u592a\u5927\uff0c\u6211\u4eec\u65e2\u60f3\u4fdd\u6301\u4e8b\u52a1\u7684\u9694\u79bb\u6027\uff0c\u53c8\u60f3\u8ba9\u670d\u52a1\u5668\u5728\u5904\u7406\u8bbf\u95ee\u540c\u4e00\u6570\u636e\u7684\u591a\u4e2a\u4e8b\u52a1\u65f6\u6027\u80fd\u5c3d\u91cf\u9ad8\u4e9b\uff0c\u90a3\u5c31\u770b\u4e8c\u8005\u5982\u4f55\u6743\u8861\u53d6\u820d\u4e86\u3002<\/p>\n\n\n\n
#\u5148\u51c6\u5907\u6570\u636e\nCREATE TABLE student (\n    studentno INT,\n    name VARCHAR(20),\n    class varchar(20),\n    PRIMARY KEY \uff08studentno)\n)Engine=InnoDB CHARSET=utf8;\n\n#\u7136\u540e\u5411\u8fd9\u4e2a\u8868\u91cc\u63d2\u5165\u4e00\u6761\u6570\u636e\uff1a\nINSERT INTO student VALUES(1\uff0c'\u5c0f\u8c37'\uff0c'1\u73ed'\uff09;<\/code><\/pre>\n\n\n\n
3.2 \u6570\u636e\u5e76\u53d1<\/h3>\n\n\n\n
1.\u810f\u5199dirty write<\/h4>\n\n\n\n
\u5bf9\u4e8e\u4e24\u4e2a\u4e8b\u52a1 Session A\u3001Session B\uff0c\u5982\u679c\u4e8b\u52a1 Session A \u4fee\u6539\u4e86 \u53e6\u4e00\u4e2a \u672a\u63d0\u4ea4 \u4e8b\u52a1 Session B \u4fee\u6539\u8fc7\u7684\u6570\u636e\uff0c\u90a3\u5c31\u610f\u5473\u7740\u53d1\u751f\u4e86 \u810f\u5199\uff0c\u793a\u610f\u56fe\u5982\u4e0b\uff1a<\/p>\n\n\n\n
\u810f\u5199\u793a\u610f\u56fe<\/p>\n\n\n\n
\u53d1\u751f\u65f6\u95f4\u7f16\u53f7<\/th>Session A<\/th>Session B<\/th><\/tr><\/thead>
\u2460<\/td>BEGIN;<\/td><\/td><\/tr>
\u2461<\/td><\/td>BEGIN;<\/td><\/tr>
\u2462<\/td><\/td>UPDATE student SET name='\u674e\u56db' WHERE studentno = 1;<\/td><\/tr>
\u2463<\/td>UPDATE student SET name='\u5f20\u4e09' WHERE studentno = 1;<\/td><\/td><\/tr>
\u2464<\/td>COMMIT;<\/td><\/td><\/tr>
\u2465<\/td><\/td>ROLLBACK;<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
Session A \u548c Session B \u5404\u5f00\u542f\u4e86\u4e00\u4e2a\u4e8b\u52a1\uff0cSession B \u4e2d\u7684\u4e8b\u52a1\u5148\u5c06 studentno \u5217\u4e3a 1 \u7684\u8bb0\u5f55\u7684 name \u5217\u66f4\u65b0\u4e3a\u201c\u674e\u56db\u201d\uff0c\u7136\u540e Session A \u4e2d\u7684\u4e8b\u52a1\u63a5\u7740\u53c8\u628a\u8fd9\u6761 studentno \u5217\u4e3a 1 \u7684\u8bb0\u5f55\u7684 name \u5217\u66f4\u65b0\u4e3a\u201c\u5f20\u4e09\u201d\u3002\u5982\u679c\u4e4b\u540e Session B \u4e2d\u7684\u4e8b\u52a1\u8fdb\u884c\u4e86\u56de\u6eda\uff0c\u90a3\u4e48 Session A \u4e2d\u7684\u66f4\u65b0\u4e5f\u5c06\u4e0d\u590d\u5b58\u5728\uff0c\u8fd9\u79cd\u73b0\u8c61\u5c31\u79f0\u4e4b\u4e3a\u810f\u5199\u3002\u8fd9\u65f6 Session A \u4e2d\u7684\u4e8b\u52a1\u5c31\u6ca1\u6709\u6548\u679c\u4e86\uff0c\u660e\u660e\u628a\u6570\u636e\u66f4\u65b0\u4e86\uff0c\u6700\u540e\u4e5f\u63d0\u4ea4\u4e8b\u52a1\u4e86\uff0c\u6700\u540e\u770b\u5230\u7684\u6570\u636e\u4ec0\u4e48\u53d8\u5316\u4e5f\u6ca1\u6709\u3002\u8fd9\u91cc\u5927\u5bb6\u5bf9\u4e8b\u52a1\u7684\u9694\u79bb\u7ea7\u522b\u6bd4\u8f83\u4e86\u89e3\u7684\u8bdd\uff0c\u4f1a\u53d1\u73b0\u9ed8\u8ba4\u9694\u79bb\u7ea7\u522b\u4e0b\uff0c\u4e0a\u9762 Session A \u4e2d\u7684\u66f4\u65b0\u8bed\u53e5\u4f1a\u5904\u4e8e\u7b49\u5f85\u72b6\u6001\uff0c\u8fd9\u91cc\u53ea\u662f\u8ddf\u5927\u5bb6\u8bf4\u660e\u4e00\u4e0b\u4f1a\u51fa\u73b0\u8fd9\u6837\u73b0\u8c61\u3002<\/p>\n\n\n\n
2.\u810f\u8bfb\uff08DirtyRead\uff09<\/h4>\n\n\n\n
\u5bf9\u4e8e\u4e24\u4e2a\u4e8b\u52a1SessionA\u3001SessionB\uff0cSessionA\u8bfb\u53d6\u4e86\u5df2\u7ecf\u88abSessionB\u66f4\u65b0\u4f46\u8fd8\u6ca1\u6709\u88ab\u63d0\u4ea4\u7684\u5b57\u6bb5\u3002\u4e4b\u540e\u82e5SessionB\u56de\u6eda\uff0cSessionA\u8bfb\u53d6\u7684\u5185\u5bb9\u5c31\u662f\u4e34\u65f6\u4e14\u65e0\u6548\u7684\u3002<\/p>\n\n\n\n
\u810f\u8bfb\u793a\u610f\u56fe<\/p>\n\n\n\n
\u53d1\u751f\u65f6\u95f4\u7f16\u53f7<\/th>Session A<\/th>Session B<\/th><\/tr><\/thead>
\u2460<\/td>BEGIN;<\/td><\/td><\/tr>
\u2461<\/td><\/td>BEGIN;<\/td><\/tr>
\u2462<\/td>SELECT * FROM student WHERE studentno = 1;<\/td>UPDATE student SET name='\u5f20\u4e09' WHERE studentno = 1;<\/td><\/tr>
\u2463<\/td>(\u5982\u679c\u8bfb\u5230\u5217name\u7684\u503c\u4e3a'\u5f20\u4e09'\uff0c\u5219\u610f\u5473\u7740\u53d1\u751f\u4e86\u810f\u8bfb)<\/td><\/td><\/tr>
\u2464<\/td>COMMIT;<\/td><\/td><\/tr>
\u2465<\/td><\/td>ROLLBACK;<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
Session A \u548c Session B \u5404\u5f00\u542f\u4e86\u4e00\u4e2a\u4e8b\u52a1\uff0cSession B \u4e2d\u7684\u4e8b\u52a1\u5148\u5c06 studentno \u5217\u4e3a 1 \u7684\u8bb0\u5f55\u7684 name \u5217\u66f4\u65b0\u4e3a\u201c\u5f20\u4e09\u201d\uff0c\u7136\u540e Session A \u4e2d\u7684\u4e8b\u52a1\u518d\u53bb\u67e5\u8be2\u8fd9\u6761 studentno \u5217\u4e3a 1 \u7684\u8bb0\u5f55\uff0c\u5982\u679c\u8bfb\u5230\u5217 name \u7684\u503c\u4e3a\u201c\u5f20\u4e09\u201d\uff0c\u800c Session B \u4e2d\u7684\u4e8b\u52a1\u7a0d\u540e\u8fdb\u884c\u4e86\u56de\u6eda\uff0c\u90a3\u4e48 Session A \u4e2d\u7684\u4e8b\u52a1\u76f8\u5f53\u4e8e\u8bfb\u5230\u4e86\u4e00\u4e2a\u4e0d\u5b58\u5728\u7684\u6570\u636e\uff0c\u8fd9\u79cd\u73b0\u8c61\u5c31\u79f0\u4e4b\u4e3a\u810f\u8bfb\u3002<\/p>\n\n\n\n
3.\u4e0d\u53ef\u91cd\u590d\u8bfb\uff08Non-Repeatable Read\uff09<\/h4>\n\n\n\n
\u5bf9\u4e8e\u4e24\u4e2a\u4e8b\u52a1 Session A\u3001Session B\uff0cSession A \u8bfb\u53d6\u4e86\u4e00\u4e2a\u5b57\u6bb5\uff0c\u7136\u540e Session B \u66f4\u65b0\u4e86\u8be5\u5b57\u6bb5\u3002\u4e4b\u540e Session A \u518d\u6b21\u8bfb\u53d6\u540c\u4e00\u4e2a\u5b57\u6bb5\uff0c\u503c\u5c31\u4e0d\u540c\u4e86\u3002\u90a3\u5c31\u610f\u5473\u7740\u53d1\u751f\u4e86\u4e0d\u53ef\u91cd\u590d\u8bfb\u3002<\/p>\n\n\n\n
7.49-9.40<\/p>\n\n\n\n
4.\u5e7b\u8bfb\uff08Phantom\uff09<\/h4>\n\n\n\n
\u5bf9\u4e8e\u4e24\u4e2a\u4e8b\u52a1 Session A\u3001Session B\uff0cSession A \u4ece\u4e00\u4e2a\u8868\u4e2d\u8bfb\u53d6\u4e86\u4e00\u4e2a\u5b57\u6bb5\uff0c\u7136\u540e Session B \u5728\u8be5\u8868\u4e2d\u63d2\u5165\u4e86\u4e00\u4e9b\u65b0\u7684\u884c\u3002\u4e4b\u540e\uff0c\u5982\u679c Session A \u518d\u6b21\u8bfb\u53d6\u540c\u4e00\u4e2a\u8868\uff0c\u5c31\u4f1a\u591a\u51fa\u51e0\u884c\u3002\u90a3\u5c31\u610f\u5473\u7740\u53d1\u751f\u4e86\u5e7b\u8bfb\u3002<\/p>\n\n\n\n
\u5e7b\u8bfb\u793a\u610f\u56fe<\/p>\n\n\n\n
\u53d1\u751f\u65f6\u95f4\u7f16\u53f7<\/th>Session A<\/th>Session B<\/th><\/tr><\/thead>
\u2460<\/td>BEGIN;<\/td><\/td><\/tr>
\u2461<\/td>SELECT * FROM student WHERE studentno > 0; (\u6b64\u65f6\u8bfb\u5230\u7684\u5217 name \u7684\u503c\u4e3a\u201c\u5f20\u4e09\u201d)<\/td><\/td><\/tr>
\u2462<\/td><\/td>INSERT INTO student VALUES(2,'\u8d75\u516d','2\u73ed');<\/td><\/tr>
\u2463<\/td>SELECT * FROM student WHERE studentno > 0; (\u5982\u679c\u8bfb\u5230\u5217 name \u7684\u503c\u4e3a\u201c\u5f20\u4e09\u201d\u3001\u201c\u8d75\u516d\u201d\u7684\u8bb0\u5f55\uff0c\u5219\u610f\u5473\u7740\u53d1\u751f\u4e86\u5e7b\u8bfb)<\/td><\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n
Session A \u4e2d\u7684\u4e8b\u52a1\u5148\u6839\u636e\u6761\u4ef6 studentno > 0 \u8fd9\u4e2a\u6761\u4ef6\u67e5\u8be2\u8868 student\uff0c\u5f97\u5230\u4e86 name \u5217\u503c\u4e3a\u201c\u5f20\u4e09\u201d\u7684\u8bb0\u5f55\uff1b\u4e4b\u540e Session B \u4e2d\u63d0\u4ea4\u4e86\u4e00\u4e2a \u9690\u5f0f\u4e8b\u52a1\uff0c\u8be5\u4e8b\u52a1\u5411\u8868 student \u4e2d\u63d2\u5165\u4e86\u4e00\u6761\u65b0\u8bb0\u5f55\uff1b\u4e4b\u540e Session A \u4e2d\u7684\u4e8b\u52a1\u518d\u6839\u636e\u76f8\u540c\u7684\u6761\u4ef6 studentno > 0 \u67e5\u8be2\u8868 student\uff0c\u5f97\u5230\u7684\u7ed3\u679c\u96c6\u4e2d\u5305\u542b Session B \u4e2d\u7684\u4e8b\u52a1\u65b0\u63d2\u5165\u7684\u90a3\u6761\u8bb0\u5f55\uff0c\u8fd9\u79cd\u73b0\u8c61\u4e5f\u88ab\u79f0\u4e4b\u4e3a\u5e7b\u8bfb\u3002\u6211\u4eec\u628a\u65b0\u63d2\u5165\u7684\u90a3\u4e9b\u8bb0\u5f55\u79f0\u4e4b\u4e3a \u5e7b\u8c61\u8bb0\u5f55\u3002<\/p>\n\n\n\n
\n
\u6ce8\u610f1:
\u6709\u7684\u540c\u5b66\u4f1a\u6709\u7591\u95ee\uff0c\u90a3\u5982\u679cSessionB\u4e2d\u5220\u9664\u4e86\u4e00\u4e9b\u7b26\u5408studentno\u300b0\u7684\u8bb0\u5f55\u800c\u4e0d\u662f\u63d2\u5165\u65b0\u8bb0\u5f55\uff0c\u90a3SessionA\u4e4b\u540e\u518d\u6839\u636estudentno>\u65e5\u7684\u6761\u4ef6\u8bfb\u53d6\u7684\u8bb0\u5f55\u53d8\u5c11\u4e86\uff0c\u8fd9\u79cd\u73b0\u8c61\u7b97\u4e0d\u7b97\u5e7b\u8bfb\u5462\uff1f\u8fd9\u79cd\u73b0\u8c61\u4e0d\u5c5e\u4e8e\u5e7b\u8bfb\uff0c\u5e7b\u8bfb\u5f3a\u8c03\u7684\u662f\u4e00\u4e2a\u4e8b\u52a1\u6309\u7167\u67d0\u4e2a\u76f8\u540c\u6761\u4ef6\u591a\u6b21\u8bfb\u53d6\u8bb0\u5f55\u65f6\uff0c\u540e\u8bfb\u53d6\u65f6\u8bfb\u5230\u4e86\u4e4b\u524d\u6ca1\u6709\u8bfb\u5230\u7684\u8bb0\u5f55\u3002
\u6ce8\u610f2\uff1a
\u90a3\u5bf9\u4e8e\u5148\u524d\u5df2\u7ecf\u8bfb\u5230\u7684\u8bb0\u5f55\uff0c\u4e4b\u540e\u53c8\u8bfb\u53d6\u4e0d\u5230\u8fd9\u79cd\u60c5\u51b5\uff0c\u7b97\u5565\u5462\uff1f\u8fd9\u76f8\u5f53\u4e8e\u5bf9\u6bcf\u4e00\u6761\u8bb0\u5f55\u90fd\u53d1\u751f\u4e86\u4e0d\u53ef\u91cd\u590d\u8bfb\u7684\u73b0\u8c61\u3002\u5e7b\u8bfb\u53ea\u662f\u91cd\u70b9\u5f3a\u8c03\u4e86\u8bfb\u53d6\u5230\u4e86\u4e4b\u524d\u8bfb\u53d6\u6ca1\u6709\u83b7\u53d6\u5230\u7684\u8bb0\u5f55\u3002 <\/p>\n<\/blockquote>\n\n\n\n
\u65e0\u8bba\u662f\u5220\u9664\u8fd8\u662f\u6dfb\u52a0, \u53ea\u8981\u662f\u8bfb\u53d6\u4e00\u6bb5\u8303\u56f4\u4e4b\u5185\u7684\u6570\u636e\u53d1\u751f\u53d8\u5316, \u90fd\u7b97\u5e7b\u8bfb, \u540c\u6837\u7684, \u65e0\u8bba\u5220\u9664\u8fd8\u662f\u6dfb\u52a0, \u53ea\u8981\u662f\u5bf9\u540c\u4e00\u6570\u636e\u8fdb\u884c\u8bfb\u53d6\u53d1\u751f\u4e86\u53d8\u5316, \u5c31\u662f\u4e0d\u53ef\u91cd\u590d\u8bfb <\/p>\n\n\n\n
3.3  SQL\u76844\u79cd\u9694\u79bb\u7ea7\u522b<\/h3>\n\n\n\n
\u4e0a\u9762\u4ecb\u7ecd\u4e86\u51e0\u79cd\u5e76\u53d1\u4e8b\u52a1\u6267\u884c\u8fc7\u7a0b\u4e2d\u53ef\u80fd\u9047\u5230\u7684\u4e00\u4e9b\u95ee\u9898\uff0c\u8fd9\u4e9b\u95ee\u9898\u6709\u8f7b\u91cd\u7f13\u6025\u4e4b\u5206\uff0c\u6211\u4eec\u7ed9\u8fd9\u4e9b\u95ee\u9898\u6309\u7167\u4e25\u91cd\u6027\u6765\u6392\u4e00\u4e0b\u5e8f\uff1a<\/p>\n\n\n\n
\u810f\u5199 > \u810f\u8bfb > \u4e0d\u53ef\u91cd\u590d\u8bfb > \u5e7b\u8bfb<\/strong><\/p>\n\n\n\n
\u6211\u4eec\u613f\u610f\u820d\u5f03\u4e00\u90e8\u5206\u9694\u79bb\u6027\u6765\u6362\u53d6\u4e00\u90e8\u5206\u6027\u80fd\u5728\u8fd9\u91cc\u5c31\u4f53\u73b0\u5728\uff1a\u8bbe\u7acb\u4e00\u4e9b\u9694\u79bb\u7ea7\u522b\uff0c\u9694\u79bb\u7ea7\u522b\u8d8a\u4f4e\uff0c\u5e76\u53d1\u95ee\u9898\u53d1\u751f\u7684\u5c31\u8d8a\u591a\u3002SQL \u6807\u51c6\u4e2d\u8bbe\u7acb\u4e86 4 \u4e2a \u9694\u79bb\u7ea7\u522b\uff1a<\/p>\n\n\n\n
    \n
  • READ UNCOMMITTED\uff1a\u8bfb\u672a\u63d0\u4ea4\uff0c\u5728\u8be5\u9694\u79bb\u7ea7\u522b\uff0c\u6240\u6709\u4e8b\u52a1\u90fd\u53ef\u4ee5\u770b\u5230\u5176\u4ed6\u672a\u63d0\u4ea4\u4e8b\u52a1\u7684\u6267\u884c\u7ed3\u679c\u3002\u4e0d\u80fd\u907f\u514d\u810f\u8bfb\u3001\u4e0d\u53ef\u91cd\u590d\u8bfb\u3001\u5e7b\u8bfb\u3002<\/li>\n\n\n\n
  • READ COMMITTED\uff1a\u8bfb\u5df2\u63d0\u4ea4\uff0c\u5b83\u6ee1\u8db3\u4e86\u9694\u79bb\u7684\u7b80\u5355\u5b9a\u4e49\uff1a\u4e00\u4e2a\u4e8b\u52a1\u53ea\u80fd\u770b\u89c1\u5df2\u7ecf\u63d0\u4ea4\u4e8b\u52a1\u6240\u505a\u7684\u6539\u53d8\u3002\u8fd9\u662f\u5927\u591a\u6570\u6570\u636e\u5e93\u7cfb\u7edf\u7684\u9ed8\u8ba4\u9694\u79bb\u7ea7\u522b\uff08\u4f46\u4e0d\u662f MySQL \u9ed8\u8ba4\u7684\uff09\u3002\u53ef\u4ee5\u907f\u514d\u810f\u8bfb\uff0c\u4f46\u4e0d\u53ef\u91cd\u590d\u8bfb\u3001\u5e7b\u8bfb\u95ee\u9898\u4ecd\u7136\u5b58\u5728\u3002<\/li>\n\n\n\n
  • REPEATABLE READ\uff1a\u53ef\u91cd\u590d\u8bfb\uff0c\u4e8b\u52a1 A \u5728\u8bfb\u5230\u4e00\u6761\u6570\u636e\u4e4b\u540e\uff0c\u6b64\u65f6\u4e8b\u52a1 B \u5bf9\u8be5\u6570\u636e\u8fdb\u884c\u4e86\u4fee\u6539\u5e76\u63d0\u4ea4\uff0c\u90a3\u4e48\u4e8b\u52a1 A \u518d\u8bfb\u8be5\u6570\u636e\uff0c\u8bfb\u5230\u7684\u8fd8\u662f\u539f\u6765\u7684\u5185\u5bb9\u3002\u53ef\u4ee5\u907f\u514d\u810f\u8bfb\u3001\u4e0d\u53ef\u91cd\u590d\u8bfb\uff0c\u4f46\u5e7b\u8bfb\u95ee\u9898\u4ecd\u7136\u5b58\u5728\u3002\u8fd9\u662f MySQL \u7684\u9ed8\u8ba4\u9694\u79bb\u7ea7\u522b\u3002<\/li>\n\n\n\n
  • SERIALIZABLE\uff1a\u53ef\u4e32\u884c\u5316\uff0c\u786e\u4fdd\u4e8b\u52a1\u53ef\u4ee5\u4ece\u4e00\u4e2a\u8868\u4e2d\u8bfb\u53d6\u76f8\u540c\u7684\u884c\u3002\u5728\u8fd9\u4e2a\u4e8b\u52a1\u6301\u7eed\u671f\u95f4\uff0c\u7981\u6b62\u5176\u4ed6\u4e8b\u52a1<\/li>\n<\/ul>\n\n\n\n
    00:01 \u539f\u6587\uff1a \u5b9e\u9645\u4e0a\u6765\u8bb2\u80af\u5b9a\u662f\u975e\u5e38\u597d\u7684\uff0c\u662f\u5427\uff1f\u80af\u5b9a\u662f\u975e\u5e38\u597d\u7684\u3002\u4f46\u662f\u7684\u8bdd\u8fd9\u6837\u5176\u5b9e\u5c31\u610f\u5473\u7740\u6211\u4eec\u6574\u4e2a\u5e76\u53d1\u6027\u5c31\u8fd9\u6837\u3002\u5f53\u65f6\u624b\u673a\u4e0a\u56de\u6765\u8bb2\uff0c\u4f60\u8981\u628a\u8fd9\u4e2a\u95ee\u9898\u90fd\u89e3\u51b3\u4e86\uff0c\u5e76\u53d1\u6027\u5c31\u7279\u522b\u5dee\u3002\u8fd9\u4e2a\u6570\u636e\u4e00\u81f4\u6027\u5408\u7406\u6027\u5f53\u7136\u90fd\u5f88\u597d\u662f\u5427\uff1f\u4f46\u662f\u4f60\u8981\u90fd\u4e0d\u80fd\u89e3\u51b3\u7684\u8bdd\uff0c\u6211\u4eec\u6316\u6398\u6027\u5f88\u597d\uff0c\u4f46\u662f\u4f60\u5fae\u4fe1\u548c\u6570\u636e\u7684\u771f\u5b9e\u6027\u5dee\u4e0d\u591a\u3002\u5f20\u56fe\u3002\u6211\u4eec\u63a5\u53d7\u4e0d\u4e86\u662f\u5427\uff1f\u600e\u4e48\u529e\uff1f\u8d5e\u52a9\u5546\u4e5f\u63a5\u53d7\u4e0d\u4e86\u4f60\u600e\u4e48\u529e\u5462\uff1f\u6211\u4eec\u5c31\u8981\u8fbe\u5230\u4e00\u4e2a\u5e73\u8861\uff0c\u8bf4\u4f60\u8981\u662f\u5e76\u53d1\u6027\u7684\u8981\u9ad8\u4e00\u70b9\u7684\uff0c\u4f60\u5c31\u600e\u4e48\u7740\uff0c\u4f60\u8981\u5e76\u53d1\u6027\u8981\u6c42\u6ca1\u90a3\u4e48\u9ad8\u4f60\u5c31\u600e\u4e48\u7740\u3002\u8fd9\u65f6\u5019\u6211\u4eec\u5c31\u9488\u5bf9\u4e8e\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff0c\u6211\u4eec\u5c31\u5206\u51fa\u6765\u51e0\u79cd\u53eb\u9694\u79bb\u7ea7\u522b\u3002 00:36 \u539f\u6587\uff1a \u9996\u5148\u7684\u8bdd\u6211\u4eec\u9488\u5bf9\u8fd9\u4e2a\u95ee\u9898\u7684\u4e25\u91cd\u60c5\u51b5\u8fdb\u884c\u4e00\u4e2a\u6392\u5e8f\uff0c\u54b1\u4eec\u8ba4\u4e3a\u5c31\u662f\u4e27\u6c14\u4e5f\u662f\u6700\u4e25\u91cd\u7684\u8fd8\u6551\u4e0d\u4e86\uff0c\u50cf\u6211\u4eec\u90fdcommit\u4e86\uff0c\u7136\u540e\u7ed3\u679c\u4f60\u770b\u770b\u6211\u6570\u5b66\u5bb6\u6ca1\u5199\u8fdb\u53bb\u662f\u5427\uff1f\u63a5\u53d7\u4e0d\u4e86\u548b\u5199\u3002\u5199\u5f20\u4e0d\u53ef\u4e2d\u6bd2\u8d29\u6bd2\uff0c\u662f\u6211\u4eec\u4e25\u91cd\u6027\u7684\u8bdd\u662f\u4ece\u9ad8\u5230\u4f4e\u8fd9\u6837\u6392\u5217\u7684\u3002\u90a3\u4e48\u8fd9\u6837\u7684\u8bdd\u6211\u4eec Circle\u5b98\u65b9\u6807\u51c6\u5f53\u4e2d\u8bbe\u7f6e\u4e86\u53eb4\u79cd\u9694\u79bb\u7ea7\u522b\uff0c\u5206\u522b\u5bf9\u5e94\u7684\u53ebread on committed\uff0c\u8fd8\u6709\u4e00\u4e2a\u53eb\u65e0reading\uff0c reading committee\u53eb\u65e0\u5f02\u8bae\u63d0\u4ea4\uff0c\u800crepeatable reader\u53ef\u91cd\u590d\u8bfb\uff0con a zero\u53eb\u5ba2\u4e32\u60c5\u51b5\u3002 01:07 \u539f\u6587\uff1a 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01:42 \u539f\u6587\uff1a 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