{"id":239658,"date":"2023-06-15T09:55:47","date_gmt":"2023-06-15T01:55:47","guid":{"rendered":"https:\/\/www.idc.net\/help\/239658\/"},"modified":"2023-06-15T09:55:47","modified_gmt":"2023-06-15T01:55:47","slug":"%e4%bb%8e%e9%93%b6%e8%a1%8c%e8%bd%ac%e8%b4%a6%e5%a4%b1%e8%b4%a5%e5%88%b0%e5%88%86%e5%b8%83%e5%bc%8f%e4%ba%8b%e5%8a%a1%ef%bc%9a%e6%80%bb%e7%bb%93%e4%b8%8e%e6%80%9d%e8%80%83","status":"publish","type":"post","link":"https:\/\/idc.net\/help\/239658\/","title":{"rendered":"\u4ece\u94f6\u884c\u8f6c\u8d26\u5931\u8d25\u5230\u5206\u5e03\u5f0f\u4e8b\u52a1\uff1a\u603b\u7ed3\u4e0e\u601d\u8003"},"content":{"rendered":"<h1>\u4ece\u94f6\u884c\u8f6c\u8d26\u5931\u8d25\u5230\u5206\u5e03\u5f0f\u4e8b\u52a1\uff1a\u603b\u7ed3\u4e0e\u601d\u8003<\/h1>\n<p><span>\u4f5c\u8005\uff1axybaby<\/span> 2017-10-24 11:39:29<br \/>\n<i><\/i><br \/>\n<span>\u5927\u6570\u636e<\/span><br \/>\n<i><\/i><br \/>\n<span>\u6570\u636e\u5e93<\/span><br \/>\n<i><\/i><br \/>\n<span>\u5206\u5e03\u5f0f<\/span> \u5927\u591a\u6570\u4eba\u53ef\u80fd\u548c\u6211\u4e00\u6837\uff0c\u7b2c\u4e00\u6b21\u542c\u8bf4\u4e8b\u52a1\u662f\u5728\u5b66\u4e60\u5173\u7cfb\u578b\u6570\u636e\u5e93(mysql\u3001sql server\u3001Oracle)\u7684\u65f6\u5019\uff0c\u5728\u5173\u7cfb\u578b\u6570\u636e\u5e93\u4e2d\uff0c\u5982\u679c\u4e00\u7ec4\u64cd\u4f5c\u6ee1\u8db3ACID\u7279\u6027\uff0c\u90a3\u4e48\u79f0\u4e4b\u4e3a\u4e00\u4e2a\u4e8b\u52a1\u3002\u5173\u4e8e\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7684ACID\u7279\u6027\uff0c\u4e0d\u7ba1\u662f\u6559\u6750\u8fd8\u662f\u7f51\u7edc\u4e0a\u90fd\u6709\u5927\u91cf\u7684\u8d44\u6599\uff0c\u8fd9\u91cc\u53ea\u7b80\u5355\u4ecb\u7ecd\u3002 <\/p>\n<p><strong>\u6b63\u6587<\/strong><\/p>\n<p>\u601d\u8003\u8fd9\u4e2a\u95ee\u9898\u7684\u521d\u8877\uff0c\u662f\u6709\u4e00\u6b21\u7ed9\u670b\u53cb\u8f6c\u8d26\uff0c\u7ed3\u679c\u6211\u7684\u94b1\u88ab\u6263\u4e86\uff0c\u670b\u53cb\u6ca1\u6536\u5230\u94b1\u3002\u800c\u6211\u4e4b\u524d\u4e00\u76f4\u8ba4\u4e3a\u94f6\u884c\u8f6c\u8d26\u4e00\u5b9a\u662f\u7531\u4e8b\u52a1\u4fdd\u8bc1\u5f3a\u4e00\u81f4\u6027\u7684\uff0c\u4e8e\u662f\u5b66\u4e60\u3001\u603b\u7ed3\u4e86\u4e00\u4e0b\u5206\u5e03\u5f0f\u4e8b\u52a1\u7684\u5404\u79cd\u7406\u8bba\u3001\u65b9\u6cd5\u3002<\/p>\n<p>\u4e8b\u52a1\u662f\u4e00\u4e2a\u975e\u5e38\u5e7f\u4e49\u7684\u8bcd\u6c47\uff0c\u5404\u884c\u5404\u4e1a\u89e3\u8bfb\u90fd\u4e0d\u4e00\u6837\u3002\u5bf9\u4e8e\u7a0b\u5e8f\u5458\uff0c\u4e8b\u52a1\u7b49\u4ef7\u4e8eTransaction\uff0c\u662f\u6307\u4e00\u7ec4\u8fde\u7eed\u7684\u64cd\u4f5c\uff0c\u8fd9\u4e9b\u64cd\u4f5c\u7ec4\u5408\u6210\u4e00\u4e2a\u903b\u8f91\u7684\u3001\u5b8c\u6574\u7684\u64cd\u4f5c\u3002\u5373\u8fd9\u7ec4\u64cd\u4f5c\u6267\u884c\u524d\u540e\uff0c\u7cfb\u7edf\u9700\u8981\u5904\u4e8e\u4e00\u4e2a\u53ef\u9884\u77e5\u7684\u3001\u4e00\u81f4\u7684\u72b6\u6001\u3002\u56e0\u6b64\uff0c\u8fd9\u4e00\u7ec4\u64cd\u4f5c\u8981\u4e48\u90fd\u6210\u529f\u6267\u884c\uff0c\u8981\u4e48\u90fd\u4e0d\u80fd\u6267\u884c;\u5982\u679c\u90e8\u5206\u6210\u529f\uff0c\u90e8\u5206\u5931\u8d25\uff0c\u6210\u529f\u7684\u90e8\u5206\u9700\u8981\u56de\u6eda(rollback)\u3002<\/p>\n<p style=\"text-align: center\"><span>[[207371]]<\/span><\/p>\n<p><strong>\u5173\u7cfb\u578b\u6570\u636e\u5e93\u4e8b\u52a1<\/strong><\/p>\n<p>\u5927\u591a\u6570\u4eba\u53ef\u80fd\u548c\u6211\u4e00\u6837\uff0c***\u6b21\u542c\u8bf4\u4e8b\u52a1\u662f\u5728\u5b66\u4e60\u5173\u7cfb\u578b\u6570\u636e\u5e93(mysql\u3001sql server\u3001Oracle)\u7684\u65f6\u5019\uff0c\u5728\u5173\u7cfb\u578b\u6570\u636e\u5e93\u4e2d\uff0c\u5982\u679c\u4e00\u7ec4\u64cd\u4f5c\u6ee1\u8db3ACID\u7279\u6027\uff0c\u90a3\u4e48\u79f0\u4e4b\u4e3a\u4e00\u4e2a\u4e8b\u52a1\u3002\u5173\u4e8e\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7684ACID\u7279\u6027\uff0c\u4e0d\u7ba1\u662f\u6559\u6750\u8fd8\u662f\u7f51\u7edc\u4e0a\u90fd\u6709\u5927\u91cf\u7684\u8d44\u6599\uff0c\u8fd9\u91cc\u53ea\u7b80\u5355\u4ecb\u7ecd\u3002<\/p>\n<ul>\n<li>A(Atomic)\uff1a\u539f\u5b50\u6027\uff0c\u6784\u6210\u4e8b\u52a1\u7684\u6240\u6709\u64cd\u4f5c\uff0c\u8981\u4e48\u90fd\u6267\u884c\u5b8c\u6210\uff0c\u8981\u4e48\u5168\u90e8\u4e0d\u6267\u884c\uff0c\u4e0d\u53ef\u80fd\u51fa\u73b0\u90e8\u5206\u6210\u529f\u90e8\u5206\u5931\u8d25\u7684\u60c5\u51b5<\/li>\n<li>C(Consistency)\uff1a\u4e00\u81f4\u6027\uff0c\u5728\u4e8b\u52a1\u6267\u884c\u524d\u540e\uff0c\u6570\u636e\u5e93\u7684\u4e00\u81f4\u6027\u7ea6\u675f\u6ca1\u6709\u88ab\u7834\u574f\u3002\u8fd9\u91cc\u7684\u4e00\u81f4\u6027\u542b\u4e49\u540e\u9762\u4f1a\u8be6\u7ec6\u89e3\u91ca<\/li>\n<li>I(Isolation)\uff1a\u9694\u79bb\u6027\uff0c\u6570\u636e\u5e93\u4e2d\u7684\u4e8b\u52a1\u4e00\u822c\u90fd\u662f\u5e76\u53d1\u7684\uff0c\u9694\u79bb\u6027\u662f\u6307\u5e76\u53d1\u7684\u4e24\u4e2a\u4e8b\u52a1\u7684\u6267\u884c\u4e92\u4e0d\u5e72\u6270\uff0c\u4e00\u4e2a\u4e8b\u52a1\u4e0d\u80fd\u770b\u5230\u5176\u4ed6\u4e8b\u52a1\u8fd0\u884c\u8fc7\u7a0b\u7684\u4e2d\u95f4\u72b6\u6001<\/li>\n<li>D(Durability)\uff1a\u6301\u4e45\u6027\uff0c\u4e8b\u52a1\u5b8c\u6210\u4e4b\u540e\uff0c\u8be5\u4e8b\u52a1\u5bf9\u6570\u636e\u7684\u66f4\u6539\u4f1a\u88ab\u6301\u4e45\u5316\u5230\u6570\u636e\u5e93\uff0c\u4e14\u4e0d\u4f1a\u88ab\u56de\u6eda\u3002<\/li>\n<\/ul>\n<p>\u6211\u4eec\u4e3e\u4e00\u4e2a\u7b80\u5355\u7684\u8f6c\u8d26\u7684\u4f8b\u5b50\uff0c\u7528\u6237A\u7ed9\u73a9\u5bb6B\u8f6c100\u5757\u94b1\uff0c\u90a3\u4e48\u6d89\u53ca\u5230\u4e24\u4e2a\u64cd\u4f5c\uff1a\u73a9\u5bb6A\u7684\u8d26\u6237\u6263100\u5143\uff0c\u73a9\u5bb6B\u7684\u8d26\u6237\u52a0100\u5143\u3002\u5373<\/p>\n<p>&nbsp;<\/p>\n<pre>\n  \n \n \n <ol>\n   \n  \n  \n  <li><span><span>UserA.account&nbsp;-=&nbsp;100&nbsp;<\/span><\/span><span>&nbsp;<\/span><\/li>\n   \n  \n  \n  <li><span>UserB.account&nbsp;+=&nbsp;100&nbsp;<\/span><\/li>\n  \n \n \n <\/ol><\/pre>\n<p>\u539f\u5b50\u6027\u5f88\u597d\u7406\u89e3\uff0c\u8fd9\u4e24\u4e2a\u64cd\u4f5c\u8981\u4e48\u90fd\u6210\u529f\uff0c\u8981\u4e48\u90fd\u4e0d\u6267\u884c(\u66f4\u51c6\u786e\u7684\u662f\u4ece\u6548\u679c\u4e0a\u6765\u770b\u7b49\u4ef7\u4e8e\u90fd\u6ca1\u6709\u6267\u884c)\u3002\u4e0d\u53ef\u80fd\u51fa\u73b0\u7528\u6237A\u7684\u94b1\u51cf\u5c11\u4e86\u800c\u7528\u6237B\u7684\u94b1\u6ca1\u589e\u52a0\u7684\u60c5\u51b5\uff0c\u7528\u6237\u662f\u4e0d\u5141\u8bb8\u7684;\u66f4\u4e0d\u53ef\u80fd\u51fa\u73b0\u7528\u6237B\u7684\u94b1\u589e\u52a0 \u800c \u7528\u6237A\u7684\u94b1\u6ca1\u6709\u51cf\u5c11\u7684\u60c5\u51b5\uff0c\u94f6\u884c\u662f\u7edd\u5bf9\u4e0d\u5e72\u7684\u3002<\/p>\n<p>\u4e00\u81f4\u6027\u8bf4\u4e00\u8d77\u6765\u5927\u5bb6\u90fd\u61c2\uff0c\u4f46\u662f\u6df1\u7a76\u8d77\u6765\u4e5f\u662f\u4f3c\u61c2\u975e\u61c2\u3002ACID\u4e2d\u7684\u4e00\u81f4\u6027\uff0c\u7f51\u7edc\u4e0a\u7684\u4ecb\u7ecd\u90fd\u5f88\u6a21\u7cca\uff0c\u90fd\u662f\u8bf4\u8981\u5904\u4e8e\u4e00\u81f4\u7684\u72b6\u6001\uff0c\u90a3\u4ec0\u4e48\u662f\u4e00\u81f4\u7684\u72b6\u6001\u5462\uff0c\u6bd4\u5982\u8f6c\u8d26\u64cd\u4f5c\u4e2d\uff0cA\u6263\u94b1\uff0cB\u52a0\u94b1\uff0cAB\u7684\u94b1\u7684\u7efc\u5408\u662f\u4e00\u5b9a\u7684\uff0c\u8fd9\u4e2a\u662f\u5426\u5c5e\u4e8eACID\u4e2d\u7684Consistency\u5462?\u6211\u89c9\u5f97\u4e0d\u662f\u7684\uff0cWiki Transaction_processing\u548cWiki\uff1a ACID\u5206\u522b\u662f\u8fd9\u4e48\u63cf\u8ff0\u7684<\/p>\n<ul>\n<li>Consistency: A transaction is a correct transformation of the state. The actions taken as a group do not violate any of the integrity constraints associated with the state.<\/li>\n<li>The consistency property ensures that any transaction will bring the database from one valid state to another. Any data written to the database must be valid according to all defined rules, including constraints, cascades, triggers, and any combination thereof. This does not guarantee correctness of the transaction in all ways the application programmer might have wanted (that is the responsibility of application-level code), but merely that any programming errors cannot result in the violation of any defined rules.<\/li>\n<\/ul>\n<p>\u4e0a\u9762\u9ed1\u8272\u52a0\u7c97\u7684\u90e8\u5206\u6307\u51fa\uff0cACID\u4e2d\u7684\u4e00\u81f4\u6027\u662f\u6307\u5b8c\u6574\u6027\u7ea6\u675f\u4e0d\u88ab\u7834\u574f\uff0c\u5b8c\u6574\u6027\u5305\u542b\u5b9e\u4f53\u5b8c\u6574\u6027(\u4e3b\u5c5e\u6027\u4e0d\u4e3a\u7a7a)\u3001\u53c2\u7167\u5b8c\u6574\u6027(\u5916\u952e\u5fc5\u987b\u5b58\u5728\u539f\u8868\u4e2d)\u3001\u7528\u6237\u81ea\u5b9a\u4e49\u7684\u5b8c\u6574\u6027\u3002\u7528\u6237\u81ea\u5b9a\u4e49\u7684\u5b8c\u6574\u6027\u6bd4\u5982\u5217\u503c\u975e\u7a7a(not null)\u3001\u5217\u503c\u552f\u4e00(unique)\u3001\u5217\u503c\u662f\u5426\u6ee1\u8db3\u4e00\u4e2abool\u8868\u8fbe\u5f0f(check\u8bed\u53e5\uff0c\u5982\u6027\u522b\u53ea\u80fd\u6709\u4e24\u4e2a\u503c\u3001\u5c81\u6570\u662f\u4e00\u5b9a\u8303\u56f4\u5185\u7684\u6574\u6570\u7b49)\uff0c\u4f8b\u5982age smallint CHECK (age &gt;=0 AND age &lt;= 120).\u6570\u636e\u5e93\u4fdd\u8bc1age\u7684\u503c\u5728[0, 120]\u7684\u8303\u56f4\uff0c\u5982\u679c\u4e0d\u5728\u8fd9\u4e2a\u8303\u6587\uff0c\u90a3\u4e48\u66f4\u65b0\u64cd\u4f5c\u5931\u8d25\uff0c\u4e8b\u52a1\u4e5f\u4f1a\u5931\u8d25\u3002\u53e6\u5916\uff0c\u5411mysql\u4e2d\u7684cascade\uff0c\u4ee5\u53ca\u89e6\u53d1\u5668(trigger)\u90fd\u5c5e\u4e8e\u7528\u6237\u81ea\u5b9a\u4e49\u7684\u5b8c\u6574\u6027\u7ea6\u675f\u3002\u5728MongoDB3.2\u4e2ddocument validation\u5c31\u662f\u7528\u6237\u81ea\u5b9a\u4e49\u7684\u5b8c\u6574\u6027\u7ea6\u675f\uff0c\u5728\u63d2\u5165\u6216\u8005\u66f4\u65b0docuemnt\u7684\u65f6\u5019\u68c0\u67e5\uff0c\u4e0d\u8fc7\u7528\u6237\u53ef\u4ee5\u81ea\u884c\u8bbe\u5b9avalidationAction\uff0c\u786e\u5b9a\u5f53\u6570\u636e\u4e0d\u7b26\u5408\u7ea6\u675f\u65f6\u7684\u8868\u73b0\uff0c\u9ed8\u8ba4\u4e3aerror\uff0c\u5373\u62d2\u7edd\u6570\u636e\u5199\u64cd\u4f5c\u3002<\/p>\n<p>\u56e0\u6b64\uff0c\u7528\u6237A\uff0cB\u5728\u8fd9\u6b21\u4e8b\u52a1\u64cd\u4f5c\u524d\u540e\uff0c\u8d26\u6237\u7684\u603b\u548c\u4e00\u5b9a\uff0c\u662f\u5e94\u7528\u5c42\u9762\u7684\u4e00\u81f4\u6027\uff0c\u800c\u4e0d\u662f\u6570\u636e\u5e93\u4fdd\u8bc1\u7684\u4e00\u81f4\u6027\uff0c\u5e94\u7528\u5c42\u9762\u7684\u4e00\u81f4\u6027\u4e8b\u5b9e\u4e0a\u662f\u7531\u539f\u5b50\u6027\u6765\u4fdd\u8bc1\u7684\u3002<\/p>\n<p>\u9694\u79bb\u6027\u8bf4\u8d77\u6765\u7b80\u5355\uff0c\u4f46\u4e8b\u5b9e\u4e0a\u80cc\u540e\u7684\u4e8b\u60c5\u5f88\u590d\u6742\uff0c\u6570\u636e\u5e93\u7684\u9694\u79bb\u6027\u4f9d\u8d56\u4e8e\u52a0\u9501\u6216\u8005\u591a\u7248\u672c\u63a7\u5236\u3002\u7b80\u5355\u6765\u8bf4\uff0c\u5982\u679cUserA.account\u521d\u59cb\u503c\u4e3a500\uff0c\u6267\u884c\u5b8c***\u6761\u6307\u4ee4(\u5373\u51cf\u53bb100)\uff0c\u4f46\u4e8b\u52a1\u8fd8\u6ca1\u6709\u63d0\u4ea4\uff0c\u5176\u4ed6\u7684\u4e8b\u52a1\u662f\u4e0d\u80fd\u8bfb\u5230\u8fd9\u4e2a\u4e2d\u95f4\u7ed3\u679c(UserA.account\u7684\u503c\u4e3a400)\u7684\u3002\u8fd9\u5c31\u662f\u907f\u514d\u4e86\u810f\u8bfb(Drity Read)\uff0c\u5bf9\u5e94\u7684\u9694\u79bb\u7ea7\u522b\u5c31\u662fREAD_COMMITTED\u3002\u5728SQL\u6807\u51c6\u4e2d\uff0c\u5b9a\u4e49\u4e86\u56db\u4e2a\u9694\u79bb\u7ea7\u522b\uff1a<\/p>\n<p>&nbsp;<\/p>\n<pre>\n  \n \n \n <ol>\n   \n  \n  \n  <li><span><span>READ_UNCOMMITTED&nbsp;<\/span><\/span><span>&nbsp;<\/span><\/li>\n   \n  \n  \n  <li><span>READ_COMMITTED&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n   \n  \n  \n  <li><span>REPEATABLE_READ&nbsp;<\/span><span>&nbsp;<\/span><\/li>\n   \n  \n  \n  <li><span><span>SERIALIZABLE<\/span><span>&nbsp;<\/span><\/span><\/li>\n  \n \n \n <\/ol><\/pre>\n<p>\u6765\u89e3\u51b3\u4e8b\u52a1\u5e76\u53d1\u4e2d\u5e26\u6765\u7684\u4e00\u4e0b\u51e0\u4e2a\u95ee\u9898\u810f\u8bfb(Dirty Read)\u3001\u4e0d\u53ef\u91cd\u590d\u8bfb(Non-repeatable Read)\u3001\u5e7b\u8bfb(Phantom Read)<\/p>\n<p>\u4e0d\u540c\u7684\u6570\u636e\u5e93\u6216\u8005\u8bf4\u5b58\u50a8\u5f15\u64ce\u9ed8\u8ba4\u652f\u6301\u4e0d\u540c\u7684\u9694\u79bb\u7ea7\u522b\uff0c\u6bd4\u5982InnoDB\u5b58\u50a8\u5f15\u64ce\u9ed8\u8ba4\u652f\u6301REPEATABLE_READ\uff0c\u800cMongodb\u53ea\u652f\u6301READ_UNCOMMITTED<\/p>\n<p>\u6301\u4e45\u6027\u9700\u8981\u8003\u8651\u5230\u4e00\u4e2a\u4e8b\u52a1\u5728\u6267\u884c\u8fc7\u7a0b\u4e2d\u7684\u5404\u79cd\u60c5\u51b5\u7684\u5f02\u5e38\u3002\u4e00\u4e2a\u4e8b\u52a1\u7684\u6d41\u7a0b\u662f\u8fd9\u6837\u7684\uff1a<\/p>\n<ul>\n<li>\u5f00\u542f\u4e00\u4e2a\u4e8b\u52a1<\/li>\n<li>\u6267\u884c\u4e00\u7ec4\u64cd\u4f5c<\/li>\n<li>\u5982\u679c\u90fd\u6267\u884c\u6210\u529f\uff0c\u90a3\u4e48\u63d0\u4ea4\u5e76\u7ed3\u675f\u4e8b\u52a1<\/li>\n<li>\u5982\u679c\u4efb\u4f55\u64cd\u4f5c\u5931\u8d25\uff0c\u90a3\u4e48\u56de\u6eda\u5df2\u7ecf\u6267\u884c\u7684\u64cd\u4f5c\uff0c\u7ed3\u675f\u4e8b\u52a1<\/li>\n<li>\u5728\u4e8b\u52a1\u6267\u884c\u8fc7\u7a0b\u4e2d\uff0c\u5982\u679c\u51fa\u73b0\u6545\u969c\uff0c\u6bd4\u5982\u65ad\u7535\u3001\u5b95\u673a\uff0c\u8fd9\u4e2a\u65f6\u5019\u5c31\u8981\u5229\u7528\u65e5\u5fd7(redo log\u6216\u8005undo log) \u52a0\u4e0a checkpoint\u6765\u4fdd\u8bc1\u4e8b\u52a1\u7684\u5b8c\u6574\u7ed3\u675f\u3002<\/li>\n<\/ul>\n<p><strong>\u5206\u5e03\u5f0f\u4e8b\u52a1<\/strong><\/p>\n<p>\u5f53\u6570\u636e\u7684\u89c4\u6a21\u8d8a\u6765\u8d8a\u5927\uff0c\u8d85\u51fa\u4e86\u5355\u4e2a\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7684\u5904\u7406\u80fd\u529b\uff0c\u8fd9\u4e2a\u65f6\u5019\u5c31\u51fa\u73b0\u4e86\u5173\u7cfb\u578b\u6570\u636e\u7684\u5782\u76f4\u5206\u8868\u6216\u8005\u5206\u8868\uff0c\u4e5f\u51fa\u73b0\u4e86\u5929\u7136\u652f\u6301\u6c34\u5e73\u6269\u5c55(sharding)\u7684NoSql\u3002\u53e6\u5916\uff0c\u5927\u578b\u7f51\u7ad9\u7684\u670d\u52a1\u5316(SOA)\u4ee5\u53ca\u8fd9\u4e24\u5e74\u975e\u5e38\u706b\u7684\u5fae\u670d\u52a1\uff0c\u5f80\u5f80\u5c06\u670d\u52a1\u8fdb\u884c\u62c6\u5206\uff0c\u5355\u72ec\u90e8\u7f72\uff0c\u81ea\u7136\u4e5f\u4f7f\u7528\u72ec\u7acb\u7684\u6570\u636e\u5e93\uff0c\u751a\u81f3\u662f\u5f02\u6784\u7684\u6570\u636e\u5e93\u3002\u8fd9\u4e2a\u65f6\u5019\uff0c\u5173\u7cfb\u578b\u6570\u636e\u5e93\u4fdd\u8bc1\u4e8b\u52a1\u7684\u624b\u6bb5\uff0c\u6bd4\u5982\u52a0\u9501\u3001\u65e5\u5fd7\u5c31\u884c\u4e0d\u901a\u4e86\u3002\u5f53\u7136\uff0c\u672c\u6587\u8ba8\u8bba\u7684\u4e0d\u4ec5\u4ec5\u662f\u6570\u636e\u5e93\uff0c\u4e5f\u5305\u542b\u5206\u5e03\u5f0f\u5b58\u50a8\u3001\u6d88\u606f\u961f\u5217\uff0c\u4ee5\u53ca\u4efb\u4f55\u8981\u4fdd\u8bc1\u539f\u5b50\u6027\u3001\u6301\u4e45\u6027\u7684\u903b\u8f91\u3002<\/p>\n<p>\u5206\u5e03\u5f0f\u4e8b\u52a1\u7684***\u6311\u6218\u5728\u4e8eCAP\uff0c\u5728\u300aCAP\u7406\u8bba\u4e0eMongoDB\u4e00\u81f4\u6027\u3001\u53ef\u7528\u6027\u7684\u4e00\u4e9b\u601d\u8003\u300b\u4e00\u6587\u4e2d\u6709\u8be6\u7ec6\u4ecb\u7ecd\u3002\u7b80\u800c\u8a00\u4e4b\uff0c\u7531\u4e8e\u7f51\u7edc\u5206\u5272(P\uff1a Network Partition)\u7684\u5b58\u5728\uff0c\u7528\u6237\u4e0d\u5f97\u4e0d\u5728\u4e00\u81f4\u6027(C Consistency)\u4e0e\u53ef\u7528\u6027(A\uff1a Avaliable)\u4e4b\u524d\u505a\u6743\u8861\u3002\u5982\u679c\u8981\u4fdd\u8bc1\u5f3a\u4e00\u81f4\u6027(\u4e3b\u8981\u662f\u5e94\u7528\u5c42\u9762\u7684\u5f3a\u4e00\u81f4\u6027)\uff0c\u90a3\u4e48\u5728\u7f51\u7edc\u5206\u5272\u7684\u65f6\u5019\uff0c\u7cfb\u7edf\u5c31\u4e0d\u53ef\u7528;\u5982\u679c\u8981\u4fdd\u8bc1\u9ad8\u53ef\u7528\u6027\uff0c\u90a3\u4e48\u5c31\u53ea\u80fd\u63d0\u4f9b\u5f31\u4e00\u81f4\u6027\uff0c\u4fdd\u8bc1\u6700\u7ec8\u4e00\u81f4\u3002\u4e0b\u9762\u63d0\u5230\u7684\u5404\u79cd\u5b9e\u73b0\u5206\u5e03\u5f0f\u4e8b\u52a1\u7684\u65b9\u6cd5\u3001\u534f\u8bae\u90fd\u9700\u8981\u5728\u4e00\u81f4\u6027\u4e0e\u53ef\u7528\u6027\u4e4b\u95f4\u6743\u8861\u3002<\/p>\n<p><strong>2PC<\/strong><\/p>\n<p>\u63d0\u5230\u5206\u5e03\u5f0f\u4e8b\u52a1\uff0c\u9996\u5148\u60f3\u5230\u7684\u80af\u5b9a\u662f\u4e24\u9636\u6bb5\u63d0\u4ea4(2pc\uff0c two-phase commit protocol)\uff0c2pc\u662f\u975e\u5e38\u7ecf\u5178\u7684\u5f3a\u4e00\u81f4\u6027\u3001\u4e2d\u5fc3\u5316\u7684\u539f\u5b50\u63d0\u4ea4\u534f\u8bae\u3002\u4e2d\u5fc3\u5316\u662f\u6307\u534f\u8bae\u4e2d\u6709\u4e24\u7c7b\u8282\u70b9\uff1a\u4e00\u4e2a\u4e2d\u5fc3\u5316\u534f\u8c03\u8005\u8282\u70b9(coordinator)\u548cN\u4e2a\u53c2\u4e0e\u8005\u8282\u70b9(participant\u3001cohort)\u3002<\/p>\n<p>\u987e\u540d\u601d\u4e49\uff0c\u4e24\u9636\u6bb5\u63d0\u4ea4\u534f\u8bae\u7684\u6bcf\u4e00\u6b21\u4e8b\u52a1\u63d0\u4ea4\u5206\u4e3a\u4e24\u4e2a\u9636\u6bb5\uff1a<\/p>\n<ul>\n<li>\u5728***\u9636\u6bb5\uff0c\u534f\u8c03\u8005\u8be2\u95ee\u6240\u6709\u7684\u53c2\u4e0e\u8005\u662f\u5426\u53ef\u4ee5\u63d0\u4ea4\u4e8b\u52a1(\u8bf7\u53c2\u4e0e\u8005\u6295\u7968)\uff0c\u6240\u6709\u53c2\u4e0e\u8005\u5411\u534f\u8c03\u8005\u6295\u7968\u3002<\/li>\n<li>\u5728\u7b2c\u4e8c\u9636\u6bb5\uff0c\u534f\u8c03\u8005\u6839\u636e\u6240\u6709\u53c2\u4e0e\u8005\u7684\u6295\u7968\u7ed3\u679c\u505a\u51fa\u662f\u5426\u4e8b\u52a1\u53ef\u4ee5\u5168\u5c40\u63d0\u4ea4\u7684\u51b3\u5b9a\uff0c\u5e76\u901a\u77e5\u6240\u6709\u7684\u53c2\u4e0e\u8005\u6267\u884c\u8be5\u51b3\u5b9a\u3002\u5728\u4e00\u4e2a\u4e24\u9636\u6bb5\u63d0\u4ea4\u6d41\u7a0b\u4e2d\uff0c\u53c2\u4e0e\u8005\u4e0d\u80fd\u6539\u53d8\u81ea\u5df1\u7684\u6295\u7968\u7ed3\u679c\u3002\u4e24\u9636\u6bb5\u63d0\u4ea4\u534f\u8bae\u7684\u53ef\u4ee5\u5168\u5c40\u63d0\u4ea4\u7684\u524d\u63d0\u662f\u6240\u6709\u7684\u53c2\u4e0e\u8005\u90fd\u540c\u610f\u63d0\u4ea4\u4e8b\u52a1\uff0c\u53ea\u8981\u6709\u4e00\u4e2a\u53c2\u4e0e\u8005\u6295\u7968\u9009\u62e9\u653e\u5f03(abort)\u4e8b\u52a1\uff0c\u5219\u4e8b\u52a1\u5fc5\u987b\u88ab\u653e\u5f03\u3002<\/li>\n<\/ul>\n<p><strong>wiki\u4e0a\u7ed9\u51fa\u4e86\u7b80\u8981\u6d41\u7a0b\uff1a<\/strong><\/p>\n<p style=\"text-align: center\">\n<p>\u6ce8\u610f\uff0c\u4e0a\u56fe\u4e2d\u6d17\u4e0b\u9762\u4e00\u884c\u4e5f\u8868\u660e\uff0c\u4e24\u9636\u6bb5\u63d0\u4ea4\u534f\u8bae\u4e5f\u4f9d\u8d56\u4e0e\u65e5\u5fd7\uff0c\u53ea\u8981\u5b58\u50a8\u4ecb\u8d28\u4e0d\u51fa\u95ee\u9898\uff0c\u4e24\u9636\u6bb5\u534f\u8bae\u5c31\u80fd\u6700\u7ec8\u8fbe\u5230\u4e00\u81f4\u7684\u72b6\u6001(\u6210\u529f\u6216\u8005\u56de\u6eda)<\/p>\n<p>\u800c\u4e0b\u56fe(\u6765\u81easlideshare)\u8be6\u7ec6\u63cf\u8ff0\u4e86\u6574\u4e2a\u6d41\u7a0b\uff1a<\/p>\n<p style=\"text-align: center\">\n<p>\u5728\u5218\u6770\u7684\u300a\u5206\u5e03\u5f0f\u539f\u7406\u4ecb\u7ecd\u4e2d\u300b\uff0c\u6709\u975e\u5e38\u8be6\u7ec6\u7684\u6d41\u7a0b\u4ecb\u7ecd\uff0c\u53ef\u4ee5\u914d\u5408\u4e0a\u56fe\u4e00\u8d77\u770b\uff0c\u53e6\u5916\u8fd8\u4ecb\u7ecd\u4e86\u5728\u5404\u79cd\u5f02\u5e38\u60c5\u51b5\u4e0b(\u6bd4\u5982Coordinator\u3001Participant\u5b95\u673a\uff0c\u7f51\u7edc\u5206\u5272\u5bfc\u81f4\u7684\u8d85\u65f6)\u4e24\u9636\u6bb5\u534f\u8bae\u7684\u5de5\u4f5c\u60c5\u51b5\u3002\u5728\u8fd9\u91cc\u53ea\u8ba8\u8bba2PC\u7684\u4f18\u7f3a\u70b9\uff1a<\/p>\n<ul>\n<li>\u4f18\u70b9\uff1a\u5f3a\u4e00\u81f4\u6027\uff0c\u53ea\u8981\u8282\u70b9\u6216\u8005\u7f51\u7edc\u6700\u7ec8\u6062\u590d\u6b63\u5e38\uff0c\u534f\u8bae\u5c31\u80fd\u4fdd\u8bc1\u987a\u5229\u7ed3\u675f;\u90e8\u5206\u5173\u7cfb\u578b\u6570\u636e\u5e93(Oracle)\u3001\u6846\u67b6\u76f4\u63a5\u652f\u6301<\/li>\n<li>\u7f3a\u70b9\uff1a\u4e24\u9636\u6bb5\u63d0\u4ea4\u534f\u8bae\u7684\u5bb9\u9519\u80fd\u529b\u8f83\u5dee\uff0c\u6bd4\u5982\u5728\u8282\u70b9\u5b95\u673a\u6216\u8005\u8d85\u65f6\u7684\u60c5\u51b5\u4e0b\uff0c\u65e0\u6cd5\u786e\u5b9a\u6d41\u7a0b\u7684\u72b6\u6001\uff0c\u53ea\u80fd\u4e0d\u65ad\u91cd\u8bd5;\u4e24\u9636\u6bb5\u63d0\u4ea4\u534f\u8bae\u7684\u6027\u80fd\u8f83\u5dee\uff0c \u6d88\u606f\u4ea4\u4e92\u591a\uff0c\u4e14\u53d7\u6700\u6162\u8282\u70b9\u5f71\u54cd<\/li>\n<\/ul>\n<p>\u8fd9\u7bc7\u6587\u7ae0\u63cf\u8ff0\u4e86\u4e3a\u4ec0\u4e48\u4e24\u9636\u6bb5\u63d0\u4ea4\u534f\u8bae\u5728\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e2d\u4e0d\u9002\u7528\uff1a<\/p>\n<p>\u7cfb\u7edf\u201c\u6c34\u5e73\u201d\u4f38\u7f29\u7684\u6b7b\u654c\u3002\u57fa\u4e8e\u4e24\u9636\u6bb5\u63d0\u4ea4\u7684\u5206\u5e03\u5f0f\u4e8b\u52a1\u5728\u63d0\u4ea4\u4e8b\u52a1\u65f6\u9700\u8981\u5728\u591a\u4e2a\u8282\u70b9\u4e4b\u95f4\u8fdb\u884c\u534f\u8c03,***\u9650\u5ea6\u5730\u63a8\u540e\u4e86\u63d0\u4ea4\u4e8b\u52a1\u7684\u65f6\u95f4\u70b9\uff0c\u5ba2\u89c2\u4e0a\u5ef6\u957f\u4e86\u4e8b\u52a1\u7684\u6267\u884c\u65f6\u95f4\uff0c\u8fd9\u4f1a\u5bfc\u81f4\u4e8b\u52a1\u5728\u8bbf\u95ee\u5171\u4eab\u8d44\u6e90\u65f6\u53d1\u751f\u51b2\u7a81\u548c\u6b7b\u9501\u7684\u6982\u7387\u589e\u9ad8\uff0c\u968f\u7740\u6570\u636e\u5e93\u8282\u70b9\u7684\u589e\u591a\uff0c\u8fd9\u79cd\u8d8b\u52bf\u4f1a\u8d8a\u6765\u8d8a\u4e25\u91cd\uff0c\u4ece\u800c\u6210\u4e3a\u7cfb\u7edf\u5728\u6570\u636e\u5e93\u5c42\u9762\u4e0a\u6c34\u5e73\u4f38\u7f29\u7684\u201d\u67b7\u9501\u201d\uff0c \u8fd9\u662f\u5f88\u591aSharding\u7cfb\u7edf\u4e0d\u91c7\u7528\u5206\u5e03\u5f0f\u4e8b\u52a1\u7684\u4e3b\u8981\u539f\u56e0\u3002<\/p>\n<p><strong>\u6240\u8a00\u751a\u662f!<\/strong><\/p>\n<p><strong>3PC<\/strong><\/p>\n<p>\u4e09\u9636\u6bb5\u63d0\u4ea4\u534f\u8bae(3pc Three-phase_commit_protocol)\u4e3b\u8981\u662f\u4e3a\u4e86\u89e3\u51b3\u4e24\u9636\u6bb5\u63d0\u4ea4\u534f\u8bae\u7684\u963b\u585e\u95ee\u9898\uff0c\u4ece\u539f\u6765\u7684\u4e24\u4e2a\u9636\u6bb5\u6269\u5c55\u4e3a\u4e09\u4e2a\u9636\u6bb5\uff0c\u5e76\u4e14\u589e\u52a0\u4e86\u8d85\u65f6\u673a\u5236\u3002<\/p>\n<p style=\"text-align: center\">\n<p>3PC\u53ea\u662f\u89e3\u51b3\u4e86\u5728\u5f02\u5e38\u60c5\u51b5\u4e0b2PC\u7684\u963b\u585e\u95ee\u9898\uff0c\u4f46\u5bfc\u81f4\u4e00\u6b21\u63d0\u4ea4\u8981\u4f20\u90126\u6761\u6d88\u606f\uff0c\u5ef6\u65f6\u5f88\u5927\u3002\u5177\u4f53\u6d41\u7a0b\u63cf\u8ff0\u53ef\u53c2\u89c1\u300a\u5173\u4e8e\u5206\u5e03\u5f0f\u4e8b\u52a1\u3001\u4e24\u9636\u6bb5\u63d0\u4ea4\u534f\u8bae\u3001\u4e09\u9636\u63d0\u4ea4\u534f\u8bae \u300b\u4e00\u6587\u3002<\/p>\n<p><strong>TCC<\/strong><\/p>\n<p>TCC\u662fTry\u3001Commit\u3001Cancel\u7684\u7f29\u5199\uff0c\u5728\u56fd\u5185\u7531\u4e8e\u652f\u4ed8\u5b9d\u7684\u5e03\u9053\u800c\u5e7f\u4e3a\u4eba\u77e5\uff0cTCC\u5728\u4fdd\u8bc1\u5f3a\u4e00\u81f4\u6027\u7684\u540c\u65f6\uff0c***\u9650\u5ea6\u63d0\u9ad8\u7cfb\u7edf\u7684\u53ef\u4f38\u7f29\u6027\u4e0e\u53ef\u7528\u6027\u3002<\/p>\n<p>\u6211\u4eec\u5047\u8bbe\u4e00\u4e2a\u5b8c\u6574\u7684\u4e3a\u4e1a\u52a1\u5305\u542b\u4e00\u7ec4\u5b50\u4e1a\u52a1\uff0cTry\u64cd\u4f5c\u5b8c\u6210\u6240\u6709\u7684\u5b50\u4e1a\u52a1\u68c0\u67e5\uff0c\u9884\u7559\u5fc5\u8981\u7684\u4e1a\u52a1\u8d44\u6e90\uff0c\u5b9e\u73b0\u4e0e\u5176\u4ed6\u4e8b\u52a1\u7684\u9694\u79bb;Confirm\u4f7f\u7528Try\u9636\u6bb5\u9884\u7559\u7684\u4e1a\u52a1\u8d44\u6e90\u771f\u6b63\u6267\u884c\u4e1a\u52a1\uff0c\u800c\u4e14Confirm\u64cd\u4f5c\u6ee1\u8db3\u5e42\u7b49\u6027\uff0c\u4ee5\u904d\u652f\u6301\u91cd\u8bd5;Cancel\u64cd\u4f5c\u91ca\u653eTry\u9636\u6bb5\u9884\u7559\u7684\u4e1a\u52a1\u8d44\u6e90\uff0c\u540c\u6837\u4e5f\u6ee1\u8db3\u5e42\u7b49\u6027\u3002\u201c\u4e00\u6b21\u5b8c\u6574\u7684\u4ea4\u6613\u7531\u4e00\u7cfb\u5217\u5fae\u4ea4\u6613\u7684Try \u64cd\u4f5c\u7ec4\u6210\uff0c\u5982\u679c\u6240\u6709\u7684Try \u64cd\u4f5c\u90fd\u6210\u529f\uff0c\u6700\u7ec8\u7531\u5fae\u4ea4\u6613\u6846\u67b6\u6765\u7edf\u4e00Confirm\uff0c\u5426\u5219\u7edf\u4e00Cancel\uff0c\u4ece\u800c\u5b9e\u73b0\u4e86\u7c7b\u4f3c\u7ecf\u5178\u4e24\u9636\u6bb5\u63d0\u4ea4\u534f\u8bae(2PC)\u7684\u5f3a\u4e00\u81f4\u6027\u3002\u201d<\/p>\n<p><strong>\u4e0e2PC\u534f\u8bae\u6bd4\u8f83 \uff0cTCC\u62e5\u6709\u4ee5\u4e0b\u7279\u70b9\uff1a<\/strong><\/p>\n<ul>\n<li>\u4f4d\u4e8e\u4e1a\u52a1\u670d\u52a1\u5c42\u800c\u975e\u8d44\u6e90\u5c42 \uff0c\u7531\u4e1a\u52a1\u5c42\u4fdd\u8bc1\u539f\u5b50\u6027<\/li>\n<li>\u6ca1\u6709\u5355\u72ec\u7684\u51c6\u5907(Prepare)\u9636\u6bb5\uff0c\u964d\u4f4e\u4e86\u63d0\u4ea4\u534f\u8bae\u7684\u6210\u672c<\/li>\n<li>Try\u64cd\u4f5c \u517c\u5907\u8d44\u6e90\u64cd\u4f5c\u4e0e\u51c6\u5907\u80fd\u529b<\/li>\n<li>Try\u64cd\u4f5c\u53ef\u4ee5\u7075\u6d3b\u9009\u62e9\u4e1a\u52a1\u8d44\u6e90\u7684\u9501\u5b9a\u7c92\u5ea6\uff0c\u800c\u4e0d\u662f\u9501\u4f4f\u6574\u4e2a\u8d44\u6e90\uff0c\u63d0\u9ad8\u4e86\u5e76\u53d1\u5ea6<\/li>\n<\/ul>\n<p>\u5f53\u7136\uff0cTCC\u9700\u8981\u8f83\u7684\u9ad8\u5f00\u53d1\u6210\u672c\uff0c\u6bcf\u4e2a\u5b50\u4e1a\u52a1\u90fd\u9700\u8981\u6709\u54cd\u5e94\u7684comfirm\u3001Cancel\u64cd\u4f5c\uff0c\u5373\u5b9e\u73b0\u76f8\u5e94\u7684\u8865\u507f\u903b\u8f91\u3002<\/p>\n<p><strong>\u57fa\u4e8e\u6d88\u606f\u7684\u5206\u5e03\u5f0f\u4e8b\u52a1<\/strong><\/p>\n<p>\u8fd9\u7c7b\u4e8b\u52a1\u673a\u5236\u5c06\u5206\u5e03\u5f0f\u4e8b\u52a1\u5206\u6210\u591a\u4e2a\u672c\u5730\u4e8b\u52a1\uff0c\u8fd9\u91cc\u79f0\u4e4b\u4e3a\u4e3b\u4e8b\u52a1\u4e0e\u4ece\u4e8b\u52a1\u3002\u9996\u5148\u4e3b\u4e8b\u52a1\u672c\u5730\u5148\u884c\u63d0\u4ea4\uff0c\u7136\u540e\u901a\u8fc7\u6d88\u606f\u901a\u77e5\u4ece\u4e8b\u52a1\uff0c\u4ece\u4e8b\u52a1\u4ece\u6d88\u606f\u4e2d\u83b7\u53d6\u4fe1\u606f\u8fdb\u884c\u672c\u5730\u63d0\u4ea4\u3002\u53ef\u4ee5\u770b\u51fa\u8fd9\u662f\u4e00\u79cd\u5f02\u6b65\u4e8b\u52a1\u673a\u5236\u3001\u53ea\u80fd\u4fdd\u8bc1\u6700\u7ec8\u4e00\u81f4\u6027;\u4f46\u53ef\u7528\u6027\u975e\u5e38\u9ad8\uff0c\u4e0d\u4f1a\u56e0\u4e3a\u6545\u969c\u800c\u53d1\u751f\u963b\u585e\u3002\u53e6\u5916\uff0c\u4e3b\u4e8b\u52a1\u5df2\u7ecf\u5148\u884c\u63d0\u4ea4\uff0c\u5982\u679c\u56e0\u4e3a\u4ece\u4e8b\u52a1\u65e0\u6cd5\u63d0\u4ea4\uff0c\u8981\u56de\u6eda\u4e3b\u4e8b\u52a1\u8fd8\u662f\u6bd4\u8f83\u9ebb\u70e6\uff0c\u6240\u4ee5\u8fd9\u79cd\u6a21\u5f0f\u53ea\u9002\u7528\u4e8e\u7406\u8bba\u4e0a\u5927\u6982\u7387\u7b49\u6210\u529f\u7684\u4e1a\u52a1\u60c5\u51b5\uff0c\u5373\u4ece\u4e8b\u52a1\u7684\u63d0\u4ea4\u5931\u8d25\u53ef\u80fd\u662f\u7531\u4e8e\u6545\u969c\uff0c\u800c\u4e0d\u5927\u53ef\u80fd\u662f\u903b\u8f91\u9519\u8bef\u3002<\/p>\n<p>\u57fa\u4e8e\u5f02\u6b65\u6d88\u606f\u7684\u4e8b\u52a1\u673a\u5236\u4e3b\u8981\u6709\u4e24\u79cd\u65b9\u5f0f\uff1a\u672c\u5730\u6d88\u606f\u8868\u4e0e\u4e8b\u52a1\u6d88\u606f\u3002\u4e8c\u8005\u7684\u533a\u522b\u5728\u4e8e\uff1a\u600e\u4e48\u4fdd\u8bc1\u4e3b\u4e8b\u52a1\u7684\u63d0\u4ea4\u4e0e\u6d88\u606f\u53d1\u9001\u8fd9\u4e24\u4e2a\u64cd\u4f5c\u7684\u539f\u5b50\u6027\u3002<\/p>\n<p>\u5982\u679c\u7528\u5f02\u6b65\u6d88\u606f\u5b9e\u73b0\u8f6c\u8d26\u7684\u4f8b\u5b50\uff0c\u90a3\u4e48\u64cd\u4f5c\u5206\u4e3a\u56db\u90e8\uff1a\u7528\u6237A\u6263\u94b1\uff0c\u53d1\u6d88\u606f\uff0c\u7528\u6237B\u6536\u6d88\u606f\uff0c\u7528\u6237B\u6263\u94b1\u3002\u524d\u4e24\u6b65\u5fc5\u987b\u4fdd\u8bc1\u539f\u5b50\u6027\uff0c\u5982\u679cA\u6263\u94b1\u6210\u529f\u4f46\u662f\u6ca1\u6709\u53d1\u51fa\u6d88\u606f\uff0c\u90a3\u4e48\u7528\u6237A\u635f\u5931\u4e86;\u5982\u679c\u53d1\u6d88\u606f\u6210\u529f\uff0c\u4f46\u662f\u6ca1\u6709\u6263\u94b1\uff0c\u90a3\u4e48\u7528\u6237B\u5c31\u591a\u5f97\u4e86\u4e00\u7b14\u94b1\uff0c\u94f6\u884c\u80af\u5b9a\u4e0d\u5e72\u3002<\/p>\n<p><strong>\u672c\u5730\u6d88\u606f\u8868<\/strong><\/p>\n<p>\u57fa\u4e8e\u672c\u5730\u6d88\u606f\u8868\u7684\u65b9\u6848\u662f\u6307\u5c06\u6d88\u606f\u5199\u5165\u672c\u5730\u6570\u636e\u5e93\uff0c\u901a\u8fc7\u672c\u5730\u4e8b\u52a1\u4fdd\u8bc1\u4e3b\u4e8b\u52a1\u4e0e\u6d88\u606f\u5199\u5165\u7684\u539f\u5b50\u6027\u3002\u4f8b\u5982\u94f6\u884c\u8f6c\u8d26\u7684\u4f8b\u5b50\uff0c\u4f2a\u7801\u5982\u4e0b\uff1a<\/p>\n<p>&nbsp;<\/p>\n<pre>\n  \n \n \n <ol>\n   \n  \n  \n  <li><span><span>begin<\/span><span>&nbsp;<\/span><span>transaction<\/span><span>:\u3000\u3000<\/span><span>update<\/span><span>&nbsp;<\/span><span>User<\/span><span>&nbsp;<\/span><span>set<\/span><span>&nbsp;account&nbsp;=&nbsp;account&nbsp;-&nbsp;100&nbsp;<\/span><span>where<\/span><span>&nbsp;userId&nbsp;=&nbsp;<\/span><span>'A'<\/span><span>&nbsp;<\/span><\/span><span>&nbsp;<\/span><\/li>\n   \n  \n  \n  <li><span><span>insert<\/span><span>&nbsp;<\/span><span>into<\/span><span>&nbsp;message(userId,&nbsp;amount,&nbsp;status)&nbsp;<\/span><span>values<\/span><span>(<\/span><span>'A'<\/span><span>,&nbsp;100,&nbsp;1)&nbsp;<\/span><\/span><span>&nbsp;<\/span><\/li>\n   \n  \n  \n  <li><span><span>commit<\/span><span>&nbsp;<\/span><span>transaction<\/span><span>&nbsp;<\/span><\/span><\/li>\n  \n \n \n <\/ol><\/pre>\n<p>\u7136\u540e\u901a\u8fc7pull\u6216\u8005push\u6a21\u5f0f\uff0c\u4ece\u4e1a\u52a1\u83b7\u53d6\u6d88\u606f\u5e76\u6267\u884c\u3002\u5982\u679c\u662fpush\u6a21\u5f0f\uff0c\u90a3\u4e48\u4e00\u822c\u4f7f\u7528\u5177\u6709\u6301\u4e45\u5316\u529f\u80fd\u7684\u6d88\u606f\u961f\u5217\uff0c\u4ece\u4e8b\u52a1\u52a1\u8ba2\u9605\u6d88\u606f\u3002\u5982\u679c\u662fpull\u6a21\u5f0f\uff0c\u90a3\u4e48\u4ece\u4e8b\u52a1\u5b9a\u65f6\u53bb\u62c9\u53d6\u6d88\u606f\uff0c\u7136\u540e\u6267\u884c\u3002<\/p>\n<p>mongodb\u7684\u5199\u5165\u5c31\u5f88\u50cf\u672c\u5730\u6d88\u606f\u8868\uff0c\u5728WriteConcern\u4e3aw:1\u7684\u60c5\u51b5\u4e0b\uff0c\u66f4\u65b0\u64cd\u4f5c\u53ea\u8981\u5199\u5230oplog\u4ee5\u53caprimary\u5c31\u53ef\u4ee5\u5411\u5ba2\u6237\u7aef\u8fd4\u56de\u3002secondary\u5f02\u6b65\u62c9\u53d6oplog\u5e76\u672c\u5730\u8bb0\u5f55\u6267\u884c\u3002<\/p>\n<p>\u4e8b\u52a1\u6d88\u606f\uff1a<\/p>\n<p>\u4e8b\u52a1\u6d88\u606f\u4f9d\u8d56\u4e8e\u652f\u6301\u201c\u4e8b\u52a1\u6d88\u606f\u201d\u7684\u6d88\u606f\u961f\u5217\uff0c\u5176\u57fa\u672c\u601d\u60f3\u662f \u5229\u7528\u6d88\u606f\u4e2d\u95f4\u95f4\u5b9e\u65bd\u4e24\u9636\u6bb5\u63d0\u4ea4\uff0c\u5c06\u672c\u5730\u4e8b\u52a1\u548c\u53d1\u6d88\u606f\u653e\u5728\u4e86\u4e00\u4e2a\u5206\u5e03\u5f0f\u4e8b\u52a1\u91cc\uff0c\u4fdd\u8bc1\u8981\u4e48\u672c\u5730\u64cd\u4f5c\u6210\u529f\u6210\u529f\u5e76\u4e14\u5bf9\u5916\u53d1\u6d88\u606f\u6210\u529f\uff0c\u8981\u4e48\u4e24\u8005\u90fd\u5931\u8d25\u3002\u6d41\u7a0b\u5982\u4e0b\uff1a<\/p>\n<ul>\n<li>\u4e3b\u4e8b\u52a1\u5411\u6d88\u606f\u961f\u5217\u53d1\u9001\u9884\u5907\u6d88\u606f\u4e3b\u4e8b\u52a1\u6536\u5230ACK\u4e4b\u540e\u672c\u5730\u6267\u884c\u4e3b\u4e8b\u52a1<\/li>\n<li>\u6839\u636e\u6267\u884c\u7684\u7ed3\u679c(\u6210\u529f\u6216\u5931\u8d25)\u5411\u6d88\u606f\u961f\u5217\u53d1\u9001\u63d0\u4ea4\u6216\u8005\u56de\u6eda\u6d88\u606f<\/li>\n<\/ul>\n<p>\u8be6\u7ec6\u7684\u6d41\u7a0b\u5982\u4e0b\u56fe(\u56fe\u7247\u6765\u6e90\u89c1\u6c34\u5370)\u6240\u793a\uff1a<\/p>\n<p style=\"text-align: center\">\n<p>\u4e0d\u96be\u770b\u5230\uff0c\u76f8\u6bd4\u672c\u5730\u6d88\u606f\u8868\u7684\u65b9\u5f0f\uff0c\u4e8b\u52a1\u6d88\u606f\u7531\u6d88\u606f\u4e2d\u95f4\u4ef6\u4fdd\u8bc1\u672c\u5730\u4e8b\u52a1\u4e0e\u6d88\u606f\u7684\u539f\u5b50\u6027\uff0c\u4e0d\u4f9d\u8d56\u4e8e\u672c\u5730\u6570\u636e\u5e93\u5b58\u50a8\u6d88\u606f\u3002\u4f46\u5b9e\u73b0\u4e86\u201c\u4e8b\u52a1\u6d88\u606f\u201d\u7684\u6d88\u606f\u961f\u5217\u6bd4\u8f83\u5c11\uff0c\u8fd8\u4e0d\u591f\u901a\u7528\u3002<\/p>\n<p>\u4e0d\u7ba1\u662f\u672c\u5730\u6d88\u606f\u8868\u8fd8\u662f\u4e8b\u52a1\u6d88\u606f\uff0c\u90fd\u9700\u8981\u4fdd\u8bc1\u4ece\u4e8b\u52a1\u6267\u884c\u4e14\u4ec5\u4ec5\u6267\u884c\u4e00\u6b21\uff0cexact once\u3002\u5982\u679c\u5931\u8d25\uff0c\u9700\u8981\u91cd\u8bd5\uff0c\u4f46\u4e5f\u4e0d\u53ef\u80fd***\u6b21\u7684\u91cd\u8bd5\uff0c\u5f53\u4ece\u4e8b\u52a1\u6700\u7ec8\u5931\u8d25\u7684\u60c5\u51b5\u4e0b\uff0c\u9700\u8981\u901a\u77e5\u4e3b\u4e1a\u52a1\u56de\u6eda\u5417?\u4f46\u662f\u6b64\u65f6\uff0c\u4e3b\u4e8b\u52a1\u5df2\u7ecf\u63d0\u4ea4\uff0c\u56e0\u6b64\u53ea\u80fd\u901a\u8fc7\u8865\u507f\uff0c\u5b9e\u73b0\u903b\u8f91\u4e0a\u7684\u56de\u6eda\uff0c\u800c\u5f53\u524d\u65f6\u95f4\u70b9\u8ddd\u4e3b\u4e8b\u52a1\u7684\u63d0\u4ea4\u5df2\u7ecf\u6709\u4e00\u5b9a\u65f6\u95f4\uff0c\u56de\u6eda\u4e5f\u53ef\u80fd\u5931\u8d25\u3002\u56e0\u6b64\uff0c***\u662f\u4fdd\u8bc1\u4ece\u4e8b\u52a1\u903b\u8f91\u4e0a\u4e0d\u4f1a\u5931\u8d25\uff0c\u4e07\u4e00\u5931\u8d25\uff0c\u8bb0\u5f55log\u5e76\u62a5\u8b66\uff0c\u4eba\u5de5\u4ecb\u5165\u3002<\/p>\n<p>1PC<\/p>\n<p>1PC(one phase commit)\u8fd9\u4e2a\u6982\u5ff5\uff0c\u6211\u662f\u5728\u300aDistributed systems for fun and profit\u300b\u4e00\u6587\u4e2d\u770b\u5230\u7684\uff0c\u5e94\u8be5\u662f\u5bf9\u68072PC\uff0c3PC\u3002\u5728wiki\u4e2d\u5e76\u6ca1\u6709\u6b63\u5f0f\u7684\u8bcd\u6761\uff0c\u5728google\u4e0a\u7684\u6587\u7ae0\u4e5f\u4e0d\u662f\u5f88\u591a\u3002\u5728\u6211\u7684\u7406\u89e3\u4e2d\uff0c1PC\u9002\u7528\u4e8e\u5206\u5e03\u5f0f\u5b58\u50a8\u7cfb\u7edf\u7684\u590d\u5236\u96c6\uff0c\u5373\u590d\u5236\u96c6\u4e2d\u591a\u4e2a\u8282\u70b9\u7684\u6570\u636e\u63d0\u4ea4\uff0c\u3002\u4e00\u822c\u6765\u8bf4\uff0c\u8fd9\u4e9b\u8282\u70b9\u5b58\u50a8\u540c\u6837\u7684\u6570\u636e\uff0c\u53ea\u8981\u5355\u4e2a\u8282\u70b9\u80fd\u63d0\u4ea4\uff0c\u5176\u4ed6\u8282\u70b9\u7406\u8bba\u4e0a\u4e5f\u5e94\u8be5\u53ef\u4ee5\u63d0\u4ea4\u3002 \u5728\u300aDistributed systems for fun and profit\u300b\u4e2d\u662f\u8fd9\u4e48\u63cf\u8ff0\u7684\uff1a<\/p>\n<ul>\n<li>Having a second phase in place before the commit is considered permanent is useful, because it allows the system to roll back an update when a node fails. In contrast, in primary\/backup (\u201c1PC\u201d), there is no step for rolling back an operation that has failed on some nodes and succeeded on others, and hence the replicas could diverge.<\/li>\n<\/ul>\n<p>\u5373\u5bf9\u4e8e\u5206\u5e03\u5f0f\u5b58\u50a8\u4e2d\u4f7f\u7528\u975e\u5e38\u5e7f\u6cdb\u7684\u4e2d\u5fc3\u5316\u590d\u5236\u96c6\u534f\u8baePrimary Secondary\uff0c\u5728\u90e8\u5206\u8282\u70b9\u5931\u8d25\u3001\u90e8\u5206\u8282\u70b9\u6210\u529f\u7684\u60c5\u51b5\u4e0b\u6ca1\u6709\u56de\u6eda\u64cd\u4f5c\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u4e0d\u4e00\u81f4\u3002\u4e0d\u8fc7\u8fd9\u4e9b\u5206\u5e03\u5f0f\u5b58\u50a8\u7cfb\u7edf\u90fd\u7aed\u529b\u4fdd\u8bc1\uff0c\u8fd9\u4e9b\u4e0d\u4e00\u81f4\u662f\u6682\u65f6\u7684\uff0c\u4f1a\u901a\u8fc7\u91cd\u8bd5\u7b49\u624b\u6bb5\u4fdd\u8bc1\u6700\u7ec8\u7684\u4e00\u81f4\u3002<\/p>\n<p>1PC\u7684\u4f18\u70b9\u662f\u6027\u80fd\u975e\u5e38\u597d\uff0c\u800c\u4e14\u53ea\u6709\u5728\u51fa\u73b0\u7269\u7406\u6545\u969c\u7684\u65f6\u5019\u624d\u4f1a\u51fa\u73b0\u4e0d\u4e00\u81f4\u3002<\/p>\n<p>\u6bd4\u5982\u5728MongoDB\u4e2d\uff0c\u66f4\u65b0\u64cd\u4f5c\u4f1a\u5199\u5165Primary\u8282\u70b9\u4ee5\u53caoplog collection\uff0cSecondary\u8282\u70b9\u4ecePrimary\u8282\u70b9\u7684oplog collection\u62c9\u53d6\u64cd\u4f5c\u65e5\u5fd7\u5e76\u6267\u884c\uff0c\u8fd9\u662f\u4e00\u4e2a\u5f02\u6b65\u7684\u8fc7\u7a0b\u3002\u53ca\u65f6Secondary\u8282\u70b9\u56e0\u4e3a\u6545\u969c\u6267\u884coplog\u5931\u8d25\uff0cPromary\u8282\u70b9\u7684\u6570\u636e\u4e5f\u4e0d\u4f1a\u56de\u6eda\u3002\u5728\u300a\u5e26\u7740\u95ee\u9898\u5b66\u4e60\u5206\u5e03\u5f0f\u7cfb\u7edf\u4e4b\u4e2d\u5fc3\u5316\u590d\u5236\u96c6\u300b\u4e2d\u4e5f\u63d0\u5230\u8fc7\uff0c\u4e3a\u4e86\u63d0\u9ad8\u6570\u636e\u53ef\u9760\u6027(\u907f\u514d\u6781\u7aef\u60c5\u51b5\u4e0b\u6570\u636e\u88ab\u56de\u6eda)\uff0c\u8bbe\u5b9aWriteConcern\u4e3aw:Majority\uff0c(shard\u6709\u4e00\u4e2aPrimary \u4e00\u4e2aSecondary 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