{"id":359,"date":"2023-02-05T18:23:16","date_gmt":"2023-02-05T10:23:16","guid":{"rendered":"http:\/\/codermr.com\/?p=359"},"modified":"2023-03-25T22:26:55","modified_gmt":"2023-03-25T14:26:55","slug":"java_mianjing_mysql","status":"publish","type":"post","link":"http:\/\/codermr.com\/index.php\/2023\/02\/05\/java_mianjing_mysql\/","title":{"rendered":"MySQL\u57fa\u7840\u77e5\u8bc6\u70b9\u6c47\u603b"},"content":{"rendered":"\n<h5 class=\"has-normal-font-size wp-block-heading\"><strong>1. MySQL \u5b58\u50a8\u5f15\u64ce MyISAM \u4e0e InnoDB \u7684\u533a\u522b\uff1f<\/strong><\/h5>\n\n\n\n<ul class=\"has-small-font-size\">\n<li>Innodb\u5f15\u64ce\uff1aInnodb\u5f15\u64ce\u63d0\u4f9b\u4e86\u5bf9\u6570\u636e\u5e93 ACID \u4e8b\u52a1\u7684\u652f\u6301\u3002\u5e76\u4e14\u8fd8\u63d0\u4f9b\u4e86\u884c\u7ea7\u9501\u548c\u5916\u952e\u7684\u7ea6\u675f\u3002\u5b83\u7684\u8bbe\u8ba1\u7684\u76ee\u6807\u5c31\u662f\u5904\u7406\u5927\u6570\u636e\u5bb9\u91cf\u7684\u6570\u636e\u5e93\u7cfb\u7edf\u3002<\/li>\n\n\n\n<li>MyIASM\u5f15\u64ce(\u539f\u672cMysql\u7684\u9ed8\u8ba4\u5f15\u64ce)\uff1a\u4e0d\u63d0\u4f9b\u4e8b\u52a1\u7684\u652f\u6301\uff0c\u4e5f\u4e0d\u652f\u6301\u884c\u7ea7\u9501\u548c\u5916\u952e\uff0c\u8868\u7ea7\u9501\u5b9a \u3002<\/li>\n<\/ul>\n\n\n\n<h5 class=\"has-normal-font-size wp-block-heading\"><strong>2. binlog \u662f\u4ec0\u4e48\uff1f<\/strong><\/h5>\n\n\n\n<p class=\"has-small-font-size\">binlog \u662f MySql Server \u5c42\u7ef4\u62a4\u7684\u4e00\u79cd\u4e8c\u8fdb\u5236\u65e5\u5fd7\uff0c\u5176\u4e3b\u8981\u662f\u7528\u6765\u8bb0\u5f55\u5bf9 MySql \u6570\u636e\u66f4\u65b0\u7684 SQL \u8bed\u53e5\uff0c\u5e76\u4ee5&#8221;\u4e8b\u52a1&#8221;\u7684\u5f62\u5f0f\u4fdd\u5b58\u5728\u78c1\u76d8\u4e2d\u3002<\/p>\n\n\n\n<p class=\"has-small-font-size\"><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-accent-color\">binlog \u4f5c\u7528\uff1a<\/mark><\/p>\n\n\n\n<ul class=\"has-small-font-size\">\n<li>\u4e3b\u4ece\u590d\u5236<\/li>\n\n\n\n<li>\u6062\u590d\u6570\u636e\uff08\u901a\u8fc7 mysqlbinlog \u7b49\u5de5\u5177\uff09<\/li>\n<\/ul>\n\n\n\n<p><\/p>\n\n\n\n<p class=\"has-small-font-size\">MySql binlog \u65e5\u5fd7\u6709 row , statement , mixed \u4e09\u79cd\u683c\u5f0f\uff0c\u53ef\u901a\u8fc7 my.cnf \u914d\u7f6e\u6587\u4ef6\u3002<\/p>\n\n\n\n<ul class=\"has-small-font-size\">\n<li>statement \u6a21\u5f0f\u4e0b\uff0c\u6bcf\u4e00\u6761\u4f1a\u4fee\u6539\u6570\u636e\u7684sql\u90fd\u4f1a\u8bb0\u5f55\u5728binlog\u4e2d\u3002\u4e0d\u9700\u8981\u8bb0\u5f55\u6bcf\u4e00\u884c\u7684\u53d8\u5316\uff0c\u51cf\u5c11\u4e86binlog\u65e5\u5fd7\u91cf\uff0c\u8282\u7ea6\u4e86IO\uff0c\u63d0\u9ad8\u6027\u80fd\u3002\u7531\u4e8esql\u7684\u6267\u884c\u662f\u6709\u4e0a\u4e0b\u6587\u7684\uff0c\u56e0\u6b64\u5728\u4fdd\u5b58\u7684\u65f6\u5019\u9700\u8981\u4fdd\u5b58\u76f8\u5173\u7684\u4fe1\u606f\uff0c\u540c\u65f6\u8fd8\u6709\u4e00\u4e9b\u4f7f\u7528\u4e86\u51fd\u6570\u4e4b\u7c7b\u7684\u8bed\u53e5\u65e0\u6cd5\u88ab\u8bb0\u5f55\u590d\u5236\u3002<\/li>\n\n\n\n<li>row \u7ea7\u522b\u4e0b\uff0c\u4e0d\u8bb0\u5f55sql\u8bed\u53e5\u4e0a\u4e0b\u6587\u76f8\u5173\u4fe1\u606f\uff0c\u4ec5\u4fdd\u5b58\u54ea\u6761\u8bb0\u5f55\u88ab\u4fee\u6539\u3002\u8bb0\u5f55\u5355\u5143\u4e3a\u6bcf\u4e00\u884c\u7684\u6539\u52a8\uff0c\u57fa\u672c\u662f\u53ef\u4ee5\u5168\u90e8\u8bb0\u4e0b\u6765\u4f46\u662f\u7531\u4e8e\u5f88\u591a\u64cd\u4f5c\uff0c\u4f1a\u5bfc\u81f4\u5927\u91cf\u884c\u7684\u6539\u52a8(\u6bd4\u5982alter table)\uff0c\u56e0\u6b64\u8fd9\u79cd\u6a21\u5f0f\u7684\u6587\u4ef6\u4fdd\u5b58\u7684\u4fe1\u606f\u592a\u591a\uff0c\u65e5\u5fd7\u91cf\u592a\u5927\u3002<\/li>\n\n\n\n<li>mixed\uff0c\u4e00\u79cd\u6298\u4e2d\u7684\u65b9\u6848\uff0c\u666e\u901a\u64cd\u4f5c\u4f7f\u7528statement\u8bb0\u5f55\uff0c\u5f53\u65e0\u6cd5\u4f7f\u7528statement\u7684\u65f6\u5019\u4f7f\u7528row\u3002<\/li>\n<\/ul>\n\n\n\n<h5 class=\"has-normal-font-size wp-block-heading\"><strong>3. \u7d22\u5f15\u6709\u54ea\u51e0\u79cd\u7c7b\u578b\uff1f<\/strong><\/h5>\n\n\n\n<ul class=\"has-small-font-size\">\n<li>\u4e3b\u952e\u7d22\u5f15: \u6570\u636e\u5217\u4e0d\u5141\u8bb8\u91cd\u590d\uff0c\u4e0d\u5141\u8bb8\u4e3aNULL\uff0c\u4e00\u4e2a\u8868\u53ea\u80fd\u6709\u4e00\u4e2a\u4e3b\u952e\u3002<\/li>\n\n\n\n<li>\u552f\u4e00\u7d22\u5f15: \u6570\u636e\u5217\u4e0d\u5141\u8bb8\u91cd\u590d\uff0c\u5141\u8bb8\u4e3aNULL\u503c\uff0c\u4e00\u4e2a\u8868\u5141\u8bb8\u591a\u4e2a\u5217\u521b\u5efa\u552f\u4e00\u7d22\u5f15\u3002\uff08\u53ef\u4ee5\u901a\u8fc7 ALTER TABLE table_name ADD UNIQUE (column); \u521b\u5efa\u552f\u4e00\u7d22\u5f15\uff09<\/li>\n\n\n\n<li>\u666e\u901a\u7d22\u5f15: \u57fa\u672c\u7684\u7d22\u5f15\u7c7b\u578b\uff0c\u6ca1\u6709\u552f\u4e00\u6027\u7684\u9650\u5236\uff0c\u5141\u8bb8\u4e3aNULL\u503c\u3002\uff08\u53ef\u4ee5\u901a\u8fc7ALTER TABLE table_name ADD INDEX index_name (column);\u521b\u5efa\u666e\u901a\u7d22\u5f15\uff09<\/li>\n\n\n\n<li>\u5168\u6587\u7d22\u5f15\uff1a \u662f\u76ee\u524d\u641c\u7d22\u5f15\u64ce\u4f7f\u7528\u7684\u4e00\u79cd\u5173\u952e\u6280\u672f\u3002\uff08InnoDB\u4e0d\u652f\u6301\uff09<\/li>\n<\/ul>\n\n\n\n<h5 class=\"has-normal-font-size wp-block-heading\"><strong>4. \u521b\u5efa\u7d22\u5f15\u6709\u54ea\u4e9b\u6ce8\u610f\u4e8b\u9879\uff1f<\/strong><\/h5>\n\n\n\n<ol class=\"has-small-font-size\">\n<li>&#8220;\u6700\u5de6\u524d\u7f00\u5339\u914d\u539f\u5219&#8221;\uff0c\u662f\u7ec4\u5408\u7d22\u5f15\u975e\u5e38\u91cd\u8981\u7684\u539f\u5219\uff0cmysql \u4f1a\u4e00\u76f4\u5411\u53f3\u5339\u914d\u76f4\u5230\u9047\u5230\u8303\u56f4\u67e5\u8be2\u5982 &gt;\u3001&lt;\u3001between\u3001like \u5c31\u505c\u6b62\u5339\u914d\u3010\u6ce8\u610f\u4e0d\u5305\u542b\u7b49\u4e8e\u53f7=\u3011\uff0c\u6bd4\u5982 a = 1 and b = 2 and c &gt; 3 and d = 4 \u5982\u679c\u5efa\u7acb (a,b,c,d) \u987a\u5e8f\u7684\u7d22\u5f15\uff0cd \u662f\u7528\u4e0d\u5230\u7d22\u5f15\u7684?\uff0c\u5982\u679c\u5efa\u7acb(a,b,d,c) \u7684\u7d22\u5f15\u5219\u90fd\u53ef\u4ee5\u7528\u5230?\uff0ca,b,d\u7684\u987a\u5e8f\u53ef\u4ee5\u4efb\u610f\u8c03\u6574\u3002<\/li>\n\n\n\n<li>= \u548c in \u53ef\u4ee5\u4e71\u5e8f\uff0c\u6bd4\u5982 a = 1 and b = 2 and c = 3 \u5efa\u7acb (a,b,c) \u7d22\u5f15\u53ef\u4ee5\u4efb\u610f\u987a\u5e8f\uff0cmysql \u7684\u67e5\u8be2\u4f18\u5316\u5668\u4f1a\u5e2e\u4f60\u4f18\u5316\u6210\u7d22\u5f15\u53ef\u4ee5\u8bc6\u522b\u7684\u5f62\u5f0f\u3002<\/li>\n\n\n\n<li>\u8f83\u9891\u7e41\u4f5c\u4e3a\u67e5\u8be2\u6761\u4ef6\u7684\u5b57\u6bb5\u624d\u53bb\u521b\u5efa\u7d22\u5f15\u3002\u4e3a\u7ecf\u5e38\u9700\u8981\u6392\u5e8f\u3001\u5206\u7ec4\u548c\u8054\u5408\u64cd\u4f5c\u7684\u5b57\u6bb5\u5efa\u7acb\u7d22\u5f15\uff0c\u7ecf\u5e38\u9700\u8981 ORDER BY\u3001GROUP BY\u3001DISTINCT \u548c UNION \u7b49\u64cd\u4f5c\u7684\u5b57\u6bb5\uff0c\u6392\u5e8f\u64cd\u4f5c\u4f1a\u6d6a\u8d39\u5f88\u591a\u65f6\u95f4\u3002\u5982\u679c\u4e3a\u5176\u5efa\u7acb\u7d22\u5f15\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u907f\u514d\u6392\u5e8f\u64cd\u4f5c\u3002<\/li>\n\n\n\n<li>\u66f4\u65b0\u9891\u7e41\u5b57\u6bb5\u4e0d\u9002\u5408\u521b\u5efa\u7d22\u5f15\u3002<\/li>\n\n\n\n<li>\u82e5\u662f\u4e0d\u80fd\u6709\u6548\u533a\u5206\u6570\u636e\u7684\u5217\u4e0d\u9002\u5408\u505a\u7d22\u5f15\u5217(\u5982\u6027\u522b\uff0c\u7537\u5973\u672a\u77e5\uff0c\u6700\u591a\u4e5f\u5c31\u4e09\u79cd\uff0c\u533a\u5206\u5ea6\u5b9e\u5728\u592a\u4f4e)\u3002<\/li>\n\n\n\n<li>\u5c3d\u91cf\u7684\u6269\u5c55\u7d22\u5f15\uff0c\u4e0d\u8981\u65b0\u5efa\u7d22\u5f15\u3002\u6bd4\u5982\u8868\u4e2d\u5df2\u7ecf\u6709a\u7684\u7d22\u5f15\uff0c\u73b0\u5728\u8981\u52a0(a,b)\u7684\u7d22\u5f15\uff0c\u90a3\u4e48\u53ea\u9700\u8981\u4fee\u6539\u539f\u6765\u7684\u7d22\u5f15\u5373\u53ef\u3002<\/li>\n\n\n\n<li>\u5b9a\u4e49\u6709\u5916\u952e\u7684\u6570\u636e\u5217\u4e00\u5b9a\u8981\u5efa\u7acb\u7d22\u5f15\u3002<\/li>\n\n\n\n<li>\u5bf9\u4e8e\u90a3\u4e9b\u67e5\u8be2\u4e2d\u5f88\u5c11\u6d89\u53ca\u7684\u5217\uff0c\u91cd\u590d\u503c\u6bd4\u8f83\u591a\u7684\u5217\u4e0d\u8981\u5efa\u7acb\u7d22\u5f15\u3002<\/li>\n\n\n\n<li>\u5bf9\u4e8e\u5b9a\u4e49\u4e3a text\u3001image \u548c bit \u7684\u6570\u636e\u7c7b\u578b\u7684\u5217\u4e0d\u8981\u5efa\u7acb\u7d22\u5f15\u3002<\/li>\n\n\n\n<li>\u5982\u679c\u901a\u914d\u7b26 % \u4e0d\u51fa\u73b0\u5728\u5f00\u5934\uff0c\u5219\u53ef\u4ee5\u7528\u5230\u7d22\u5f15\uff0c\u4f46\u6839\u636e\u5177\u4f53\u60c5\u51b5\u4e0d\u540c\u53ef\u80fd\u53ea\u4f1a\u7528\u5176\u4e2d\u4e00\u4e2a\u524d\u7f00\u3002\u5728 like \u201cvalue%\u201d \u53ef\u4ee5\u4f7f\u7528\u7d22\u5f15\uff0c\u4f46\u662f like \u201c%value%\u201d \u4e0d\u4f1a\u4f7f\u7528\u7d22\u5f15\uff0c\u8d70\u7684\u662f\u5168\u8868\u626b\u63cf\u3002<\/li>\n<\/ol>\n\n\n\n<h5 class=\"has-normal-font-size wp-block-heading\"><strong>5. \u4ec0\u4e48\u662f\u6700\u5de6\u524d\u7f00\u539f\u5219\uff1f<\/strong><\/h5>\n\n\n\n<p class=\"has-small-font-size\">\u6700\u5de6\u524d\u7f00\uff1a\u987e\u540d\u601d\u4e49\uff0c\u5c31\u662f\u6700\u5de6\u4f18\u5148\uff0c\u4e0a\u4f8b\u4e2d\u6211\u4eec\u521b\u5efa\u4e86 lname_fname_age \u591a\u5217\u7d22\u5f15\uff0c\u76f8\u5f53\u4e8e\u521b\u5efa\u4e86 (lname) \u5355\u5217\u7d22\u5f15\uff0c(lname,fname) \u7ec4\u5408\u7d22\u5f15\u4ee5\u53ca (lname,fname,age) \u7ec4\u5408\u7d22\u5f15\uff0c\u5728\u6267\u884c\u67e5\u8be2\u65f6\uff0c\u53ea\u80fd\u4f7f\u7528\u4e00\u4e2a\u7d22\u5f15\u3002<\/p>\n\n\n\n<h5 class=\"has-normal-font-size wp-block-heading\"><strong>6. \u4ec0\u4e48\u662f\u805a\u7c07\u7d22\u5f15\u4e0e\u975e\u805a\u7c07\u7d22\u5f15\uff1f<\/strong><\/h5>\n\n\n\n<p class=\"has-small-font-size\"><strong>\u805a\u7c07\u7d22\u5f15\uff1a<\/strong>\u5c06\u6570\u636e\u5b58\u50a8\u4e0e\u7d22\u5f15\u653e\u5230\u4e86\u4e00\u5757\uff0c\u627e\u5230\u7d22\u5f15\u4e5f\u5c31\u627e\u5230\u4e86\u6570\u636e\u3002<\/p>\n\n\n\n<p class=\"has-small-font-size\"><strong>\u975e\u805a\u7c07\u7d22\u5f15<\/strong>\uff1a\u5c06\u6570\u636e\u5b58\u50a8\u4e8e\u7d22\u5f15\u5206\u5f00\u7ed3\u6784\uff0c\u7d22\u5f15\u7ed3\u6784\u7684\u53f6\u5b50\u8282\u70b9\u6307\u5411\u4e86\u6570\u636e\u7684\u5bf9\u5e94\u884c\uff0cmyisam \u901a\u8fc7 key_buffer \u628a\u7d22\u5f15\u5148\u7f13\u5b58\u5230\u5185\u5b58\u4e2d\uff0c\u5f53\u9700\u8981\u8bbf\u95ee\u6570\u636e\u65f6\uff08\u901a\u8fc7\u7d22\u5f15\u8bbf\u95ee\u6570\u636e\uff09\uff0c\u5728\u5185\u5b58\u4e2d\u76f4\u63a5\u641c\u7d22\u7d22\u5f15\uff0c\u7136\u540e\u901a\u8fc7\u7d22\u5f15\u627e\u5230\u78c1\u76d8\u76f8\u5e94\u6570\u636e\uff0c\u8fd9\u4e5f\u5c31\u662f\u4e3a\u4ec0\u4e48\u7d22\u5f15\u4e0d\u5728key buffer \u547d\u4e2d\u65f6\uff0c\u901f\u5ea6\u6162\u7684\u539f\u56e0\u3002<\/p>\n\n\n\n<p class=\"has-small-font-size\">\u6f84\u6e05\u4e00\u4e2a\u6982\u5ff5\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"has-small-font-size\">innodb\u4e2d\uff0c\u5728\u805a\u7c07\u7d22\u5f15\u4e4b\u4e0a\u521b\u5efa\u7684\u7d22\u5f15\u79f0\u4e4b\u4e3a\u8f85\u52a9\u7d22\u5f15\uff0c\u8f85\u52a9\u7d22\u5f15\u8bbf\u95ee\u6570\u636e\u603b\u662f\u9700\u8981\u4e8c\u6b21\u67e5\u627e\uff0c\u975e\u805a\u7c07\u7d22\u5f15\u90fd\u662f\u8f85\u52a9\u7d22\u5f15\uff0c\u50cf\u590d\u5408\u7d22\u5f15\u3001\u524d\u7f00\u7d22\u5f15\u3001\u552f\u4e00\u7d22\u5f15\uff0c\u8f85\u52a9\u7d22\u5f15\u53f6\u5b50\u8282\u70b9\u5b58\u50a8\u7684\u4e0d\u518d\u662f\u884c\u7684\u7269\u7406\u4f4d\u7f6e\uff0c\u800c\u662f\u4e3b\u952e\u503c\u3002<\/p>\n<\/blockquote>\n\n\n\n<h5 class=\"has-normal-font-size wp-block-heading\"><strong>7. \u975e\u805a\u7c07\u7d22\u5f15\u4e00\u5b9a\u4f1a\u56de\u8868\u67e5\u8be2\u5417\uff1f<\/strong><\/h5>\n\n\n\n<p class=\"has-small-font-size\">\u4e0d\u4e00\u5b9a\uff0c\u8fd9\u6d89\u53ca\u5230\u67e5\u8be2\u8bed\u53e5\u6240\u8981\u6c42\u7684\u5b57\u6bb5\u662f\u5426\u5168\u90e8\u547d\u4e2d\u4e86\u7d22\u5f15\uff0c\u5982\u679c\u5168\u90e8\u547d\u4e2d\u4e86\u7d22\u5f15\uff0c\u90a3\u4e48\u5c31\u4e0d\u5fc5\u518d\u8fdb\u884c\u56de\u8868\u67e5\u8be2\u3002<\/p>\n\n\n\n<p class=\"has-small-font-size\"><br>\u4e3e\u4e2a\u7b80\u5355\u7684\u4f8b\u5b50<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"has-small-font-size\">\u5047\u8bbe\u6211\u4eec\u5728\u5458\u5de5\u8868\u7684\u5e74\u9f84\u4e0a\u5efa\u7acb\u4e86\u7d22\u5f15\uff0c\u90a3\u4e48\u5f53\u8fdb\u884c select age from employee where age &lt; 20 \u7684\u67e5\u8be2\u65f6\uff0c\u5728\u7d22\u5f15\u7684\u53f6\u5b50\u8282\u70b9\u4e0a\uff0c\u5df2\u7ecf\u5305\u542b\u4e86age \u4fe1\u606f\uff0c\u4e0d\u4f1a\u518d\u6b21\u8fdb\u884c\u56de\u8868\u67e5\u8be2\u3002<\/p>\n<\/blockquote>\n\n\n\n<h5 class=\"has-normal-font-size wp-block-heading\"><strong>8. \u4e8b\u7269\u7684\u56db\u5927\u7279\u6027(ACID)<\/strong><\/h5>\n\n\n\n<ul class=\"has-small-font-size\">\n<li>\u539f\u5b50\u6027\uff1a \u4e8b\u52a1\u662f\u6700\u5c0f\u7684\u6267\u884c\u5355\u4f4d\uff0c\u4e0d\u5141\u8bb8\u5206\u5272\u3002\u4e8b\u52a1\u7684\u539f\u5b50\u6027\u786e\u4fdd\u52a8\u4f5c\u8981\u4e48\u5168\u90e8\u5b8c\u6210\uff0c\u8981\u4e48\u5b8c\u5168\u4e0d\u8d77\u4f5c\u7528\uff1b<\/li>\n\n\n\n<li>\u4e00\u81f4\u6027\uff1a \u6267\u884c\u4e8b\u52a1\u524d\u540e\uff0c\u6570\u636e\u4fdd\u6301\u4e00\u81f4\uff0c\u591a\u4e2a\u4e8b\u52a1\u5bf9\u540c\u4e00\u4e2a\u6570\u636e\u8bfb\u53d6\u7684\u7ed3\u679c\u662f\u76f8\u540c\u7684\uff1b<\/li>\n\n\n\n<li>\u9694\u79bb\u6027\uff1a \u5e76\u53d1\u8bbf\u95ee\u6570\u636e\u5e93\u65f6\uff0c\u4e00\u4e2a\u7528\u6237\u7684\u4e8b\u52a1\u4e0d\u88ab\u5176\u4ed6\u4e8b\u52a1\u6240\u5e72\u6270\uff0c\u5404\u5e76\u53d1\u4e8b\u52a1\u4e4b\u95f4\u6570\u636e\u5e93\u662f\u72ec\u7acb\u7684\uff1b<\/li>\n\n\n\n<li>\u6301\u4e45\u6027\uff1a \u4e00\u4e2a\u4e8b\u52a1\u88ab\u63d0\u4ea4\u4e4b\u540e\u3002\u5b83\u5bf9\u6570\u636e\u5e93\u4e2d\u6570\u636e\u7684\u6539\u53d8\u662f\u6301\u4e45\u7684\uff0c\u5373\u4f7f\u6570\u636e\u5e93\u53d1\u751f\u6545\u969c\u4e5f\u4e0d\u5e94\u8be5\u5bf9\u5176\u6709\u4efb\u4f55\u5f71\u54cd\u3002<\/li>\n<\/ul>\n\n\n\n<h5 class=\"has-normal-font-size wp-block-heading\"><strong>9. \u4ec0\u4e48\u662f\u810f\u8bfb\uff1f\u5e7b\u8bfb\uff1f\u4e0d\u53ef\u91cd\u590d\u8bfb\uff1f<\/strong><\/h5>\n\n\n\n<ul class=\"has-small-font-size\">\n<li><strong>\u810f\u8bfb<\/strong>(Drity Read)\uff1a\u67d0\u4e2a\u4e8b\u52a1\u5df2\u66f4\u65b0\u4e00\u4efd\u6570\u636e\uff0c\u53e6\u4e00\u4e2a\u4e8b\u52a1\u5728\u6b64\u65f6\u8bfb\u53d6\u4e86\u540c\u4e00\u4efd\u6570\u636e\uff0c\u7531\u4e8e\u67d0\u4e9b\u539f\u56e0\uff0c\u524d\u4e00\u4e2aRollBack\u4e86\u64cd\u4f5c\uff0c\u5219\u540e\u4e00\u4e2a\u4e8b\u52a1\u6240\u8bfb\u53d6\u7684\u6570\u636e\u5c31\u4f1a\u662f\u4e0d\u6b63\u786e\u7684\u3002<\/li>\n\n\n\n<li><strong>\u4e0d\u53ef\u91cd\u590d\u8bfb<\/strong>(Non-repeatable read):\u5728\u4e00\u4e2a\u4e8b\u52a1\u7684\u4e24\u6b21\u67e5\u8be2\u4e4b\u4e2d\u6570\u636e\u4e0d\u4e00\u81f4\uff0c\u8fd9\u53ef\u80fd\u662f\u4e24\u6b21\u67e5\u8be2\u8fc7\u7a0b\u4e2d\u95f4\u63d2\u5165\u4e86\u4e00\u4e2a\u4e8b\u52a1\u66f4\u65b0\u7684\u539f\u6709\u7684\u6570\u636e\u3002\u3010\u518d\u6b21\u8bfb\u7684\u65f6\u5019\u6570\u636e\u53d8\u5316\u4e86\u3011<\/li>\n\n\n\n<li><strong>\u5e7b\u8bfb<\/strong>(Phantom Read):\u5728\u4e00\u4e2a\u4e8b\u52a1\u7684\u4e24\u6b21\u67e5\u8be2\u4e2d\u6570\u636e\u7b14\u6570\u4e0d\u4e00\u81f4\uff0c\u4f8b\u5982\u6709\u4e00\u4e2a\u4e8b\u52a1\u67e5\u8be2\u4e86\u51e0\u5217(Row)\u6570\u636e\uff0c\u800c\u53e6\u4e00\u4e2a\u4e8b\u52a1\u5374\u5728\u6b64\u65f6\u63d2\u5165\u4e86\u65b0\u7684\u51e0\u5217\u6570\u636e\uff0c\u5148\u524d\u7684\u4e8b\u52a1\u5728\u63a5\u4e0b\u6765\u7684\u67e5\u8be2\u4e2d\uff0c\u5c31\u4f1a\u53d1\u73b0\u6709\u51e0\u5217\u6570\u636e\u662f\u5b83\u5148\u524d\u6240\u6ca1\u6709\u7684\u3002\u3010\u518d\u6b21\u8bfb\u7684\u65f6\u5019\u6570\u636e\u591a\u4e86\u3011<\/li>\n<\/ul>\n\n\n\n<h5 class=\"has-normal-font-size wp-block-heading\"><strong>10. SQL \u6807\u51c6\u5b9a\u4e49\u4e86\u56db\u4e2a\u9694\u79bb\u7ea7\u522b\uff1f<\/strong><\/h5>\n\n\n\n<ul class=\"has-small-font-size\">\n<li><strong>READ-UNCOMMITTED(\u8bfb\u672a\u63d0\u4ea4)<\/strong>\uff1a \u6700\u4f4e\u7684\u9694\u79bb\u7ea7\u522b\uff0c\u5141\u8bb8\u8bfb\u53d6\u5c1a\u672a\u63d0\u4ea4\u7684\u6570\u636e\u53d8\u66f4\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u810f\u8bfb\u3001\u5e7b\u8bfb\u6216\u4e0d\u53ef\u91cd\u590d\u8bfb\u3002<\/li>\n\n\n\n<li><strong>READ-COMMITTED(\u8bfb\u5df2\u63d0\u4ea4)<\/strong>\uff1a \u5141\u8bb8\u8bfb\u53d6\u5e76\u53d1\u4e8b\u52a1\u5df2\u7ecf\u63d0\u4ea4\u7684\u6570\u636e\uff0c\u53ef\u4ee5\u963b\u6b62\u810f\u8bfb\uff0c\u4f46\u662f\u5e7b\u8bfb\u6216\u4e0d\u53ef\u91cd\u590d\u8bfb\u4ecd\u6709\u53ef\u80fd\u53d1\u751f\u3002<\/li>\n\n\n\n<li><strong>REPEATABLE-READ(\u53ef\u91cd\u590d\u8bfb)<\/strong>\uff1a \u5bf9\u540c\u4e00\u5b57\u6bb5\u7684\u591a\u6b21\u8bfb\u53d6\u7ed3\u679c\u90fd\u662f\u4e00\u81f4\u7684\uff0c\u9664\u975e\u6570\u636e\u662f\u88ab\u672c\u8eab\u4e8b\u52a1\u81ea\u5df1\u6240\u4fee\u6539\uff0c\u53ef\u4ee5\u963b\u6b62\u810f\u8bfb\u548c\u4e0d\u53ef\u91cd\u590d\u8bfb\uff0c\u4f46\u5e7b\u8bfb\u4ecd\u6709\u53ef\u80fd\u53d1\u751f\u3002<\/li>\n\n\n\n<li><strong>SERIALIZABLE(\u53ef\u4e32\u884c\u5316)<\/strong>\uff1a \u6700\u9ad8\u7684\u9694\u79bb\u7ea7\u522b\uff0c\u5b8c\u5168\u670d\u4eceACID\u7684\u9694\u79bb\u7ea7\u522b\u3002\u6240\u6709\u7684\u4e8b\u52a1\u4f9d\u6b21\u9010\u4e2a\u6267\u884c\uff0c\u8fd9\u6837\u4e8b\u52a1\u4e4b\u95f4\u5c31\u5b8c\u5168\u4e0d\u53ef\u80fd\u4ea7\u751f\u5e72\u6270\uff0c\u4e5f\u5c31\u662f\u8bf4\uff0c\u8be5\u7ea7\u522b\u53ef\u4ee5\u9632\u6b62\u810f\u8bfb\u3001\u4e0d\u53ef\u91cd\u590d\u8bfb\u4ee5\u53ca\u5e7b\u8bfb\u3002<\/li>\n<\/ul>\n\n\n\n<p><\/p>\n\n\n\n<p class=\"has-small-font-size\">\u8fd9\u91cc\u9700\u8981\u6ce8\u610f\u7684\u662f\uff1aMysql \u9ed8\u8ba4\u91c7\u7528\u7684 REPEATABLE_READ \u9694\u79bb\u7ea7\u522b\uff0cOracle \u9ed8\u8ba4\u91c7\u7528\u7684 READ_COMMITTED\u9694\u79bb\u7ea7\u522b\u3002<\/p>\n\n\n\n<p class=\"has-small-font-size\">\u4e8b\u52a1\u9694\u79bb\u673a\u5236\u7684\u5b9e\u73b0\u57fa\u4e8e\u9501\u673a\u5236\u548c\u5e76\u53d1\u8c03\u5ea6\u3002\u5176\u4e2d\u5e76\u53d1\u8c03\u5ea6\u4f7f\u7528\u7684\u662fMVVC\uff08\u591a\u7248\u672c\u5e76\u53d1\u63a7\u5236\uff09\uff0c\u901a\u8fc7\u4fdd\u5b58\u4fee\u6539\u7684\u65e7\u7248\u672c\u4fe1\u606f\u6765\u652f\u6301\u5e76\u53d1\u4e00\u81f4\u6027\u8bfb\u548c\u56de\u6eda\u7b49\u7279\u6027\u3002\u56e0\u4e3a\u9694\u79bb\u7ea7\u522b\u8d8a\u4f4e\uff0c\u4e8b\u52a1\u8bf7\u6c42\u7684\u9501\u8d8a\u5c11\uff0c\u6240\u4ee5\u5927\u90e8\u5206\u6570\u636e\u5e93\u7cfb\u7edf\u7684\u9694\u79bb\u7ea7\u522b\u90fd\u662fREAD-COMMITTED(\u8bfb\u53d6\u63d0\u4ea4\u5185\u5bb9):\uff0c\u4f46\u662f\u4f60\u8981\u77e5\u9053\u7684\u662fInnoDB \u5b58\u50a8\u5f15\u64ce\u9ed8\u8ba4\u4f7f\u7528 **REPEATABLE-READ\uff08\u53ef\u91cd\u8bfb\uff09**\u5e76\u4e0d\u4f1a\u6709\u4efb\u4f55\u6027\u80fd\u635f\u5931\u3002InnoDB \u5b58\u50a8\u5f15\u64ce\u5728 \u5206\u5e03\u5f0f\u4e8b\u52a1 \u7684\u60c5\u51b5\u4e0b\u4e00\u822c\u4f1a\u7528\u5230**SERIALIZABLE(\u53ef\u4e32\u884c\u5316)**\u9694\u79bb\u7ea7\u522b\u3002<\/p>\n\n\n\n<h5 class=\"has-normal-font-size wp-block-heading\"><strong>11. \u9694\u79bb\u7ea7\u522b\u4e0e\u9501\u7684\u5173\u7cfb\uff1f<\/strong><\/h5>\n\n\n\n<ul class=\"has-small-font-size\">\n<li>\u5728Read Uncommitted\u7ea7\u522b\u4e0b\uff0c\u8bfb\u53d6\u6570\u636e\u4e0d\u9700\u8981\u52a0\u5171\u4eab\u9501\uff0c\u8fd9\u6837\u5c31\u4e0d\u4f1a\u8ddf\u88ab\u4fee\u6539\u7684\u6570\u636e\u4e0a\u7684\u6392\u4ed6\u9501\u51b2\u7a81<\/li>\n\n\n\n<li>\u5728Read Committed\u7ea7\u522b\u4e0b\uff0c\u8bfb\u64cd\u4f5c\u9700\u8981\u52a0\u5171\u4eab\u9501\uff0c\u4f46\u662f\u5728\u8bed\u53e5\u6267\u884c\u5b8c\u4ee5\u540e\u91ca\u653e\u5171\u4eab\u9501\uff1b<\/li>\n\n\n\n<li>\u5728Repeatable Read\u7ea7\u522b\u4e0b\uff0c\u8bfb\u64cd\u4f5c\u9700\u8981\u52a0\u5171\u4eab\u9501\uff0c\u4f46\u662f\u5728\u4e8b\u52a1\u63d0\u4ea4\u4e4b\u524d\u5e76\u4e0d\u91ca\u653e\u5171\u4eab\u9501\uff0c\u4e5f\u5c31\u662f\u5fc5\u987b\u7b49\u5f85\u4e8b\u52a1\u6267\u884c\u5b8c\u6bd5\u4ee5\u540e\u624d\u91ca\u653e\u5171\u4eab\u9501\u3002<\/li>\n\n\n\n<li>SERIALIZABLE \u662f\u9650\u5236\u6027\u6700\u5f3a\u7684\u9694\u79bb\u7ea7\u522b\uff0c\u56e0\u4e3a\u8be5\u7ea7\u522b\u9501\u5b9a\u6574\u4e2a\u8303\u56f4\u7684\u952e\uff0c\u5e76\u4e00\u76f4\u6301\u6709\u9501\uff0c\u76f4\u5230\u4e8b\u52a1\u5b8c\u6210\u3002<\/li>\n<\/ul>\n\n\n\n<h5 class=\"has-normal-font-size wp-block-heading\"><strong>12. \u884c\u7ea7\u9501\u4e0e\u8868\u7ea7\u9501\uff1f<\/strong><\/h5>\n\n\n\n<p class=\"has-small-font-size\"><strong>\u884c\u7ea7\u9501<\/strong><\/p>\n\n\n\n<p class=\"has-small-font-size\">\u884c\u7ea7\u9501\u662fMysql\u4e2d\u9501\u5b9a\u7c92\u5ea6\u6700\u7ec6\u7684\u4e00\u79cd\u9501\uff0c\u8868\u793a\u53ea\u9488\u5bf9\u5f53\u524d\u64cd\u4f5c\u7684\u884c\u8fdb\u884c\u52a0\u9501\u3002\u884c\u7ea7\u9501\u80fd\u5927\u5927\u51cf\u5c11\u6570\u636e\u5e93\u64cd\u4f5c\u7684\u51b2\u7a81\u3002\u5176\u52a0\u9501\u7c92\u5ea6\u6700\u5c0f\uff0c\u4f46\u52a0\u9501\u7684\u5f00\u9500\u4e5f\u6700\u5927\u3002\u884c\u7ea7\u9501\u5206\u4e3a\u5171\u4eab\u9501 \u548c \u6392\u4ed6\u9501\u3002<\/p>\n\n\n\n<p class=\"has-small-font-size\">\u7279\u70b9\uff1a\u5f00\u9500\u5927\uff0c\u52a0\u9501\u6162\uff1b\u4f1a\u51fa\u73b0\u6b7b\u9501\uff1b\u9501\u5b9a\u7c92\u5ea6\u6700\u5c0f\uff0c\u53d1\u751f\u9501\u51b2\u7a81\u7684\u6982\u7387\u6700\u4f4e\uff0c\u5e76\u53d1\u5ea6\u4e5f\u6700\u9ad8\u3002<\/p>\n\n\n\n<p class=\"has-small-font-size\"><strong>\u8868\u7ea7\u9501<\/strong><\/p>\n\n\n\n<p 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