{"id":17860,"date":"2025-04-13T09:45:00","date_gmt":"2025-04-13T01:45:00","guid":{"rendered":"https:\/\/www.orczhou.com\/?p=17860"},"modified":"2025-04-15T10:58:02","modified_gmt":"2025-04-15T02:58:02","slug":"innodb-implicit-locks","status":"publish","type":"post","link":"https:\/\/www.orczhou.com\/index.php\/2025\/04\/innodb-implicit-locks\/","title":{"rendered":"MySQL\/InnoDB \u7684 \u9690\u5f0f\u9501"},"content":{"rendered":"<div id=\"tocer-1\" class=\"tocer tocer-pos-flt-e\"><div class=\"tocer-toc\"><header class=\"tocer-header\"><h2 class=\"tocer-title\">\u76ee\u5f55<\/h2>\n<\/header>\n<ul class=\"tocer-list tocer-adv tocer-sp-os-bf tocer-st-ctrs-dec tocer-lvl1\"><li class=\"tocer-has-sub\"><div><a href=\"#tocer-heading-1\">\u5199\u5165\u6570\u636e\u4ea7\u751f\u7684\u9690\u5f0f\u9501<\/a><\/div>\n<ul class=\"tocer-sublist tocer-lvl2\"><li><div><a href=\"#tocer-heading-2\">\u51c6\u5907\u6570\u636e<\/a><\/div><\/li>\n<li><div><a href=\"#tocer-heading-3\">\u6784\u5efa\u9690\u5f0f\u9501<\/a><\/div><\/li>\n<li><div><a href=\"#tocer-heading-4\">\u6784\u5efa\u9501\u7ade\u4e89\/\u9690\u5f0f\u8f6c\u663e\u5f0f<\/a><\/div><\/li>\n<\/ul>\n<\/li>\n<li class=\"tocer-has-sub\"><div><a href=\"#tocer-heading-5\">\u4e3b\u952e\/\u4e8c\u7ea7\u7d22\u5f15\u64cd\u4f5c\u76f8\u5173\u7684\u9690\u5f0f\u9501<\/a><\/div>\n<ul class=\"tocer-sublist tocer-lvl2\"><li><div><a href=\"#tocer-heading-6\">\u4e3b\u952e\u64cd\u4f5c\u65f6\u4e8c\u7ea7\u7d22\u5f15\u4e0a\u7684\u9690\u5f0f\u9501<\/a><\/div><\/li>\n<li><div><a href=\"#tocer-heading-7\">\u51c6\u5907\u6570\u636e<\/a><\/div><\/li>\n<li><div><a href=\"#tocer-heading-8\">\u6784\u5efa\u9690\u5f0f\u9501<\/a><\/div><\/li>\n<li><div><a href=\"#tocer-heading-9\">\u9690\u5f0f\u9501\u8f6c\u6362\u4e3a\u663e\u5f0f\u9501<\/a><\/div><\/li>\n<\/ul>\n<\/li>\n<li class=\"tocer-has-sub\"><div><a href=\"#tocer-heading-10\">\u6700\u540e<\/a><\/div>\n<ul class=\"tocer-sublist tocer-lvl2\"><li><div><a href=\"#tocer-heading-11\">\u4e00\u4e9b\u7406\u89e3<\/a><\/div><\/li>\n<li><div><a href=\"#tocer-heading-12\">\u4e00\u5757\u62fc\u56fe<\/a><\/div><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<p>InnoDB \u7684\u9501\u5bb9\u6613\u88ab\u5ffd\u7565\u7684\u7ec6\u8282\u662f\u5173\u4e8e\u201c\u9690\u5f0f\u9501\u201d\uff08\u5373\uff1a<code>implicit locks<\/code>\uff09\u7684\u5b58\u5728\u3002\u8868\u73b0\u4e0a\uff0c\u6709\u7684\u9501\u662f\u5b58\u5728\u7684\uff0c\u4f46\u5728\u4f7f\u7528<code>SHOW ENGINE INNODB STATUS<\/code>\u6216\u8005<code>performance_schema.data_locks<\/code>\u4e2d\u5374\u67e5\u770b\u4e0d\u5230\u3002\u6700\u4e3a\u5e38\u89c1\u7684\u9690\u5f0f\u9501\u662f\u5728\u5199\u5165\uff08<code>INSERT<\/code>\uff09\u65f6\uff0c\u5f53\u524d\u4e8b\u52a1\u4f1a\u6301\u6709\u8be5\u8bb0\u5f55\u5bf9\u5e94\u7684\u9501\uff0c\u4f46\u662f\u5728\u7cfb\u7edf\u4e2d\uff0c\u901a\u5e38\u662f\u67e5\u770b\u4e0d\u5230\u7684\u3002\u4f46\uff0c\u5982\u679c\u53d1\u751f\u4e86\u8be5\u9501\u51b2\u7a81\uff08\u6216\u7ade\u4e89\uff09\u65f6\uff0c\u7cfb\u7edf\u4e2d\u5219\u53ef\u4ee5\u770b\u5230\u6b64\u7c7b\u9501\u4fe1\u606f\u3002<\/p>\n\n\n\n<p>\u672c\u6587\u91cd\u73b0\u4e86\u8f83\u4e3a\u5e38\u89c1\u7684\u9690\u5f0f\u9501\u573a\u666f\uff0c\u5305\u62ec\uff1a\u6570\u636e\u5199\u5165\uff08<code>INSERT<\/code>\uff09\u65f6\u7684\u9690\u5f0f\u9501\u3001\u6839\u636e\u4e3b\u952e\u64cd\u4f5c\u662f\u53ef\u80fd\u4ea7\u751f\u7684\u4e8c\u7ea7\u7d22\u5f15\u9690\u5f0f\u9501\u7b49\u3002\u5e2e\u52a9\u5f00\u53d1\u8005\u80fd\u591f\u66f4\u7cfb\u7edf\u7684\u7406\u89e3\uff0cInnoDB \u7684\u9501\u673a\u5236\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u5199\u5165\u6570\u636e\u4ea7\u751f\u7684\u9690\u5f0f\u9501<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">\u51c6\u5907\u6570\u636e<\/h4>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-28f84493 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:38%\">\n<pre class=\"wp-block-code\"><code lang=\"sql\" class=\"language-sql\">DROP TABLE IF exists t1;\n\n CREATE TABLE `t1` (\n  `id` int unsigned,\n  `nick` varchar(32),\n  `age` int,\n  UNIQUE KEY `uk_n` (`nick`)\n);<\/code><\/pre>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:62%\">\n<pre class=\"wp-block-code\"><code lang=\"sql\" class=\"language-sql\">mysql&gt; desc t1;\n+-------+--------------+------+-----+---------+\n| Field | Type         | Null | Key | Default |\n+-------+--------------+------+-----+---------+\n| id    | int unsigned | YES  |     | NULL    |\n| nick  | varchar(32)  | YES  | UNI | NULL    |\n| age   | int          | YES  |     | NULL    |\n+-------+--------------+------+-----+---------+<\/code><\/pre>\n<\/div>\n<\/div>\n\n\n\n<p><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"sql\" class=\"language-sql\">mysql&gt; INSERT INTO t1 VALUES (1, 'a' , 12),(20,'z',29);\nQuery OK, 2 rows affected (0.01 sec)\nRecords: 2  Duplicates: 0  Warnings: 0\n\nmysql&gt; select * from t1;\n+------+------+------+\n| id   | nick | age  |\n+------+------+------+\n|    1 | a    |   12 |\n|   20 | z    |   29 |\n+------+------+------+\n2 rows in set (0.00 sec)<\/code><\/pre>\n\n\n\n<h4 class=\"wp-block-heading\">\u6784\u5efa\u9690\u5f0f\u9501<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"sql\" class=\"language-sql\">mysql&gt; START TRANSACTION;\nQuery OK, 0 rows affected (0.00 sec)\n\nmysql&gt; INSERT INTO t1 VALUES (8, 'h' , 32);\nQuery OK, 1 row affected (0.00 sec)<\/code><\/pre>\n\n\n\n<p>\u67e5\u770b\u9501\u4fe1\u606f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"sql\" class=\"language-sql\">&gt; SELECT \n    ENGINE_TRANSACTION_ID AS TRX_ID,\n    OBJECT_NAME,\n    INDEX_NAME,\n    LOCK_TYPE,\n    LOCK_MODE,\n    LOCK_STATUS,\n    LOCK_DATA \n  FROM performance_schema.data_locks;\n+--------+-------------+------------+-----------+-----------+-------------+-----------+\n| TRX_ID | OBJECT_NAME | INDEX_NAME | LOCK_TYPE | LOCK_MODE | LOCK_STATUS | LOCK_DATA |\n+--------+-------------+------------+-----------+-----------+-------------+-----------+\n|  10165 | t1          | NULL       | TABLE     | IX        | GRANTED     | NULL      |\n+--------+-------------+------------+-----------+-----------+-------------+-----------+<\/code><\/pre>\n\n\n\n<p>\u53ef\u4ee5\u770b\u5230\uff0c\u5728 <code>data_locks<\/code> \u8868\u4e2d\u6ca1\u6709\u4efb\u4f55\u5173\u4e8e\u4e8b\u52a1\u4e2d\u5199\u5165\u6570\u636e\u76f8\u5173\u7684\u9501\u3002\u8fd9\u662f\uff0c\u56e0\u4e3a\u8fd9\u662f\u4e00\u4e2a\u9690\u5f0f\u7684\u9501\uff0c\u5728\u6ca1\u6709\u4efb\u4f55\u9501\u7ade\u4e89\u7684\u60c5\u51b5\u4e0b\uff0c\u7cfb\u7edf\u5e76\u4e0d\u4f1a\u5c06\u8be5\u7c7b\u578b\u7684\u9501\u5c55\u793a\u51fa\u6765\uff08\u6ce8\uff1a\u8fd9\u53ef\u80fd\u4e0e\u5e95\u5c42\u7684\u5b58\u50a8\u548c\u5b9e\u73b0\u6709\u5173\uff0c\u9690\u5f0f\u9501\u5728\u5b9e\u73b0\u4e0a\u53ef\u80fd\u5c31\u6ca1\u6709\u201c\u663e\u5f0f\u201d\u7684\u5b58\u50a8\u5728\u9501\u76f8\u5173\u7684\u6570\u636e\u7ed3\u6784\u4e2d\uff09\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u6784\u5efa\u9501\u7ade\u4e89\/\u9690\u5f0f\u8f6c\u663e\u5f0f<\/h4>\n\n\n\n<p>\u8fd9\u91cc\u901a\u8fc7\u5728\u53e6\u4e00\u4e2a\u4e8b\u52a1\u4e2d\u5c1d\u8bd5\u5e76\u53d1\u5199\u5165\u4e00\u6761\u51b2\u7a81\u7684\u8bb0\u5f55\uff0c\u6765\u6784\u5efa\u9501\u7ade\u4e89\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"sql\" class=\"language-sql\">mysql&gt; START TRANSACTION;\nQuery OK, 0 rows affected (0.00 sec)\n\nmysql&gt; INSERT INTO  t1 VALUES (9,'h',17);\n...<\/code><\/pre>\n\n\n\n<p>\u8be5\u4e8b\u52a1\u6267\u884c\u65f6\uff0c\u5219\u4f1a\u9677\u5165\u9501\u7b49\u5f85\u3002\u8fd9\u65f6\uff0c\u518d\u6b21\u67e5\u770b\u9501\u4fe1\u606f\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code lang=\"sql\" class=\"language-sql\">+--------+-------------+------------+-----------+---------------+-------------+---------------------+\n| TRX_ID | OBJECT_NAME | INDEX_NAME | LOCK_TYPE | LOCK_MODE     | LOCK_STATUS | LOCK_DATA           |\n+--------+-------------+------------+-----------+---------------+-------------+---------------------+\n|  10165 | t1          | NULL       | TABLE     | IX            | GRANTED     | NULL                |\n|  10168 | t1          | NULL       | TABLE     | IX            | GRANTED     | NULL                |\n|  10165 | t1          | uk_n       | RECORD    | X,REC_NOT_GAP | GRANTED     | 'h', 0x000000000214 |\n|  10168 | t1          | uk_n       | RECORD    | S             | WAITING     | 'h', 0x000000000214 |\n+--------+-------------+------------+-----------+---------------+-------------+---------------------<\/code><\/pre>\n\n\n\n<p>\u8fd9\u65f6\u5019\uff0c\u53ef\u4ee5\u770b\u5230\u4e8b\u52a1<code>10165<\/code>\uff0c\u6301\u6709\u4e00\u4e2a\u8bb0\u5f55\u9501\uff0c\u8be5\u9501\u662f\u4e00\u4e2a\u6392\u5b83\u8bb0\u5f55\u9501\uff08<code>X,REC_NOT_GAP<\/code> \uff09\uff0c\u52a0\u9501\u5bf9\u8c61\u662f<code>'h', 0x000000000214<\/code>\uff08\u6ce8\uff0c\u8fd9\u662f\u4e00\u4e2a\u552f\u4e00\u7d22\u5f15\u7684\u5165\u53e3\uff0c\u524d\u9762<code>'h'<\/code>\u662f\u552f\u4e00\u7d22\u5f15\u503c\uff0c\u540e\u9762\u7684<code>0x000000000214<\/code>\u90e8\u5206\u662f\u8be5\u8868\u7684InnoDB\u5185\u7f6e<code>rowid<\/code>\uff09\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">\u4e3b\u952e\/\u4e8c\u7ea7\u7d22\u5f15\u64cd\u4f5c\u76f8\u5173\u7684\u9690\u5f0f\u9501<\/h3>\n\n\n\n<p>InnoDB \u7684\u9501\u7ba1\u7406\u548c\u5b9e\u73b0\u786e\u5b9e\u4e00\u4e2a\u8d85\u7ea7\u590d\u6742\u7684\u90e8\u5206\uff08&#8221;<a href=\"https:\/\/dev.mysql.com\/blog-archive\/innodb-data-locking-part-2-5-locks-deeper-dive\/\">mega-complicated<\/a>&#8220;\uff09\u3002\u9690\u5f0f\u9501\u7684\u4f7f\u7528\u573a\u666f\u4e5f\u975e\u5e38\u591a\uff0c\u5982\u679c\u5bf9\u6b64\u4e0d\u4e86\u89e3\u7684\u8bdd\uff0c\u90a3\u4e48\u5728\u89c2\u5bdf InnoDB \u7684\u9501\u4fe1\u606f\u65f6\uff0c\u662f\u4f1a\u6709\u5f88\u591a\u7684\u56f0\u60d1\u7684\u3002\u8fd9\u91cc\u518d\u5217\u4e3e\u4e00\u7c7b\u4e5f\u7b97\uff0c\u8f83\u4e3a\u5e38\u7528\u7684\u9690\u5f0f\u9501\uff1a\u201c\u4e3b\u952e\u7d22\u5f15\/\u4e8c\u7ea7\u7d22\u5f15\u201d\u76f8\u5173\u7684\u9690\u5f0f\u8bf4\u3002\u5373\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5f53\u5bf9\u8bb0\u5f55\u8fdb\u884c\u64cd\u4f5c\u65f6\uff0c\u5373\u4fbf\u662f\u901a\u8fc7\u4e3b\u952e\u626b\u63cf\uff0c\u4e5f\u53ef\u80fd\u5bf9\u4e8c\u7ea7\u7d22\u5f15\u8fdb\u884c\u52a0\u9501<\/li>\n\n\n\n<li>\u5f53\u5bf9\u8bb0\u5f55\u8fdb\u884c\u64cd\u4f5c\u65f6\uff0c\u5373\u4fbf\u662f\u901a\u8fc7\u4e8c\u7ea7\u7d22\u5f15\u626b\u63cf\uff0c\u4e5f\u53ef\u80fd\u5bf9\u4e3b\u952e\u8fdb\u884c\u52a0\u9501<\/li>\n<\/ul>\n\n\n\n<p>\u8fd9\u7c7b\u573a\u666f\u7684\u52a0\u9501\uff0c\u901a\u5e38\u90fd\u662f\u4f1a\u5b58\u5728\u9690\u5f0f\u9501\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u4e3b\u952e\u64cd\u4f5c\u65f6\u4e8c\u7ea7\u7d22\u5f15\u4e0a\u7684\u9690\u5f0f\u9501<\/h4>\n\n\n\n<p>\u5728\u4e0b\u9762\u7684\u6d4b\u8bd5\u4e2d\uff0c\u6211\u4eec\u5148\u4e3b\u952e <code>id = 8<\/code>\u7684\u8bb0\u5f55\u8fdb\u884c\u5220\u9664\u64cd\u4f5c\uff0c\u7136\u540e\u901a\u8fc7\u7cfb\u7edf\u8868<code>data_locks<\/code>\u89c2\u5bdf\u8be5\u4e8b\u52a1\u662f\u5426\u6301\u6709\u4e8c\u7ea7\u7d22\u5f15\u76f8\u5173\u7684\u9501\uff1b\u800c\u540e\uff0c\u5728\u53e6\u4e00\u4e2a\u4e8b\u52a1\u4e2d\uff0c\u901a\u8fc7\u4e8c\u7ea7\u7d22\u5f15\uff08<code>nick = 'Henry'<\/code>\uff09\u5bf9\u8be5\u8bb0\u5f55\u8fdb\u884c\u64cd\u4f5c\uff08\u5171\u4eab\u8bfb\uff09\uff0c\u800c\u540e\u518d\u91cd\u65b0\u89c2\u5bdf\u524d\u9762\u4e8b\u52a1\u7684\u9501\u72b6\u6001\u3002<\/p>\n\n\n\n<p>\u5728\u4e0b\u9762\u7684\u6d4b\u8bd5\u53ef\u4ee5\u89c2\u5bdf\u5230\uff0c\u5728<strong><code>Session B<\/code><\/strong>\u6ca1\u6709\u5f00\u59cb\u524d\uff1b\u5728 <code>Session A<\/code>\u7684<code>DELETE<\/code>\u8bed\u53e5\u662f\u89c2\u6d4b\u4e0d\u5230\u4e8c\u7ea7\u7d22\u5f15\u4e0a\u7684\u9501\u7684\uff1b\u4f46\u5f53<strong><code>Session B<\/code><\/strong>\u5c1d\u8bd5\u53bb\u9501\u5b9a\u4e8c\u7ea7\u7d22\u5f15\u4e0a\u7684\u5165\u53e3\u65f6\uff0c\u518d\u6b21\u89c2\u5bdf<code>Session A<\/code>\u4e0a\u7684\u9501\u4fe1\u606f\uff0c\u5c31\u53ef\u4ee5\u770b\u5230\uff0c\u5728<code>Session A<\/code>\u6ca1\u6709\u4efb\u4f55\u64cd\u4f5c\u7684\u60c5\u51b5\u4e0b\uff0c\u591a\u51fa\u4e86\u4e00\u4e2a\u989d\u5916\u7684\u3001\u6301\u6709\u7684\u4e8c\u7ea7\u7d22\u5f15\u4e0a\u7684\u9501\uff0c\u8be5\u9501\u539f\u672c\u662f\u4e00\u4e2a\u201c\u9690\u5f0f\u9501\u201d\uff0c\u5728\u53d1\u751f\u9501\u7ade\u4e89\u540e\uff0c\u8f6c\u5316\u4e3a\u4e00\u4e2a\u201c\u663e\u5f0f\u9501\u201d\u3002\u5373\u4fbf\u662f\u5728<code>Session B<\/code>\u56e0\u4e3a\u7b49\u5f85\u64cd\u4f5c\u6216\u7ed3\u675f\u4e86\uff0c<code>Session A<\/code>\u6301\u6709\u7684\u5df2\u7ecf\u8f6c\u5316\u7684\u201c\u663e\u5f0f\u9501\u201d\u4e5f\u4e0d\u4f1a\u518d\u56de\u9000\u4e86\u3002\u8be6\u7ec6\u6d4b\u8bd5\u5982\u4e0b\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u51c6\u5907\u6570\u636e<\/h4>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-28f84493 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:38%\">\n<pre class=\"wp-block-code\"><code lang=\"sql\" class=\"language-sql\">DROP TABLE IF exists t1;\n CREATE TABLE `t1` (\n  `id` int unsigned,\n  `nick` varchar(32),\n  `age` int,\n  PRIMARY KEY (`id`),\n  UNIQUE KEY `uk_n` (`nick`)\n);<\/code><\/pre>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:62%\">\n<pre class=\"wp-block-code\"><code lang=\"sql\" class=\"language-sql\">mysql> INSERT INTO t1 VALUES (1,\"Alice\",12);\nmysql> INSERT INTO t1 VALUES (8,\"Henry\",27);\nmysql> INSERT INTO t1 VALUES (16,\"Peter\",15);\nmysql> show variables like '%iso%';\n+-----------------------+----------------+\n| Variable_name         | Value          |\n+-----------------------+----------------+\n| transaction_isolation | READ-COMMITTED |\n+-----------------------+----------------+<\/code><\/pre>\n<\/div>\n<\/div>\n\n\n\n<h4 class=\"wp-block-heading\">\u6784\u5efa\u9690\u5f0f\u9501<\/h4>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-28f84493 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<p class=\"has-text-align-center\"><strong>Session A<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\" style=\"font-size:12px\"><code lang=\"sql\" class=\"language-sql\">mysql> START TRANSACTION;\nmysql> DELETE FROM t1 WHERE id = 8;\n\nmysql> SELECT\n    ->     ENGINE_TRANSACTION_ID AS TRX_ID,\n    ->     INDEX_NAME,LOCK_TYPE,\n    ->     LOCK_MODE, LOCK_STATUS,\n    ->     LOCK_DATA\n    ->   FROM performance_schema.data_locks;\n+--------+------------+-----------+---------------+-------------+-----------+\n| TRX_ID | INDEX_NAME | LOCK_TYPE | LOCK_MODE     | LOCK_STATUS | LOCK_DATA |\n+--------+------------+-----------+---------------+-------------+-----------+\n|  10317 | NULL       | TABLE     | IX            | GRANTED     | NULL      |\n|  10317 | PRIMARY    | RECORD    | X,REC_NOT_GAP | GRANTED     | 8         |\n+--------+------------+-----------+---------------+-------------+-----------+<\/code><\/pre>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<p class=\"has-text-align-center\"><strong>Session B<\/strong><\/p>\n<\/div>\n<\/div>\n\n\n\n<h4 class=\"wp-block-heading\">\u9690\u5f0f\u9501\u8f6c\u6362\u4e3a\u663e\u5f0f\u9501<\/h4>\n\n\n\n<p>\u7ee7\u7eed\u4e0a\u8ff0\u4e24\u4e2a<code>Sessions<\/code>\u7684\u64cd\u4f5c\uff1a<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-28f84493 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<p class=\"has-text-align-center\"><strong>Session A<\/strong><\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<p class=\"has-text-align-center\"><strong>Session B<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\" style=\"font-size:12px\"><code lang=\"sql\" class=\"language-sql\">mysql> START TRANSACTION;\nmysql> SELECT * FROM t1 WHERE nick = 'Henry' FOR SHARE;\n( Waiting )<\/code><\/pre>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-28f84493 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<pre class=\"wp-block-code\" style=\"font-size:12px\"><code lang=\"sql\" class=\"language-sql\">...(Query Locks From performance_schema.data_locks like above)...\n+-----------------+------------+-----------+---------------+-------------+------------+\n| TRX_ID          | INDEX_NAME | LOCK_TYPE | LOCK_MODE     | LOCK_STATUS | LOCK_DATA  |\n+-----------------+------------+-----------+---------------+-------------+------------+\n|           10317 | NULL       | TABLE     | IX            | GRANTED     | NULL       |\n| 421929568337920 | NULL       | TABLE     | IS            | GRANTED     | NULL       |\n|           10317 | uk_n       | RECORD    | X,REC_NOT_GAP | GRANTED     | 'Henry', 8 |\n| 421929568337920 | uk_n       | RECORD    | S,REC_NOT_GAP | WAITING     | 'Henry', 8 |\n|           10317 | PRIMARY    | RECORD    | X,REC_NOT_GAP | GRANTED     | 8          |\n+-----------------+------------+-----------+---------------+-------------+------------+<\/code><\/pre>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-28f84493 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<pre class=\"wp-block-code\" style=\"font-size:12px\"><code lang=\"sql\" class=\"language-sql\">(... Abort last statement...)\nERROR 1205 (HY000): Lock wait timeout exceeded; \ntry restarting transaction<\/code><\/pre>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-28f84493 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<pre class=\"wp-block-code\" style=\"font-size:12px\"><code lang=\"sql\" class=\"language-sql\">...(Query Locks From performance_schema.data_locks like above)...\n+--------+------------+-----------+---------------+-------------+------------+\n| TRX_ID | INDEX_NAME | LOCK_TYPE | LOCK_MODE     | LOCK_STATUS | LOCK_DATA  |\n+--------+------------+-----------+---------------+-------------+------------+\n|  10317 | NULL       | TABLE     | IX            | GRANTED     | NULL       |\n|  10321 | NULL       | TABLE     | IS            | GRANTED     | NULL       |\n|  10317 | uk_n       | RECORD    | X,REC_NOT_GAP | GRANTED     | 'Henry', 8 |\n|  10317 | PRIMARY    | RECORD    | X,REC_NOT_GAP | GRANTED     | 8          |\n+--------+------------+-----------+---------------+-------------+------------+<\/code><\/pre>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\">\u6700\u540e<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">\u4e00\u4e9b\u7406\u89e3<\/h4>\n\n\n\n<p>\u201c\u9690\u5f0f\u9501\u201d\u53ef\u4ee5\u7406\u89e3\u4e3a\uff0c\u5728\u67d0\u4e9b\u6761\u4ef6\u4e0b\uff0c\u8fd9\u91cc\u4e00\u5b9a\u662f\u5b58\u5728\u201c\u9501\u201d\u7684\uff0c\u6240\u4ee5\uff0c\u65e2\u7136\u4e00\u5b9a\u662f\u5b58\u5728\u7684\uff0c\u5e76\u4e14\u8fd9\u7c7b\u573a\u666f\u53ef\u80fd\u8fd8\u6bd4\u8f83\u5e7f\u6cdb\uff0c\u90a3\u4e48\u4e3a\u4e86\u8282\u7701\u5b58\u50a8\u7a7a\u95f4\u4e0e\u64cd\u4f5c\uff0c\u5c31\u7701\u7565\u4e86\u6b64\u7c7b\u201c\u9501\u201d\u7684\u8868\u793a\u3002\u4f8b\u5982\uff0c\u901a\u5e38\uff0c\u5982\u679c\u4e8b\u52a1\u5199\u5165\u4e86\u4e00\u6761\u6570\u636e\uff0c\u90a3\u4e48\u8be5\u4e8b\u52a1\u4e00\u5b9a\u662f\u6301\u6709\u8be5\u6570\u636e\u7684\u6392\u5b83\u9501\u7684\u3002<\/p>\n\n\n\n<p>\u4f46\uff0c\u5f53\u771f\u7684\u6709\u5176\u4ed6\u4e8b\u52a1\u4e5f\u5c1d\u8bd5\u53bb\u83b7\u53d6\u8be5\u201c\u9690\u5f0f\u9501\u201d\u7684\u65f6\u5019\uff0c\u90a3\u4e48\u4e3a\u4e86\u4fbf\u4e8e\u8fdb\u884c\u9501\u68c0\u6d4b\u4e0e\u7ba1\u7406\uff0c\u5219\u4f1a\u91cd\u65b0\u5c06\u8be5\u9501\u8868\u793a\u51fa\u6765\u3002\u5e76\u4e14\uff0c\u4e5f\u4e0d\u518d\u6709\u5fc5\u8981\u91cd\u65b0\u8f6c\u5316\u4e3a\u9690\u5f0f\u9501\u3002<\/p>\n\n\n\n<p>\u6240\u4ee5\uff0c\u5982\u679c\u6709\u4eba\u95ee\uff0c\u4f60\u662f\u5426\u53ef\u4ee5\u628a\u5f53\u524d\u6570\u636e\u5e93\u7684\u6240\u6709\u7684\u9501\u60c5\u51b5\uff0c\u90fd\u6253\u5370\u6216\u8bb0\u5f55\u4e0b\u6765\uff0c\u8fd9\u662f\u505a\u4e0d\u5230\u7684\uff0c\u4e5f\u662f\u6ca1\u6709\u5fc5\u8981\u7684\u3002\u4e8b\u5b9e\u4e0a\uff0c\u201c\u9690\u5f0f\u9501\u201d\u662f\u5e7f\u6cdb\u5b58\u5728\u7684\uff0c\u4f46\u56e0\u4e3a\u901a\u5e38\u5e76\u6ca1\u6709\u90a3\u4e48\u9501\u7ade\u4e89\uff0c\u8fd9\u4e9b\u201c\u9690\u5f0f\u9501\u201d\u4e5f\u5c31\u4e00\u76f4\u4e0d\u4f1a\u88ab\u8868\u793a\u51fa\u6765\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">\u4e00\u5757\u62fc\u56fe<\/h4>\n\n\n\n<p>\u901a\u5e38\uff0c\u9690\u5f0f\u9501\u662f\u53ef\u4ee5\u88ab\u5ffd\u7565\u7684\uff0c\u5982\u4e0a\u8ff0\u793a\u4f8b\uff0c\u8fd9\u53ef\u80fd\u662f\u4e00\u4e2a\u6ca1\u6709\u4efb\u4f55\u7ade\u4e89\u7684\u9501\u3002\u4f46\uff0c\u5f53\u51fa\u73b0\u5bf9\u5e94\u7684\u9501\u7ade\u4e89\u65f6\uff0c\u5219\u4f1a\u53d8\u5f97\u53ef\u89c1\u3002\u4e00\u822c\u5730\uff0c\u662f\u53ef\u4ee5\u4e0d\u7528\u5173\u6ce8\u9690\u5f0f\u9501\u7684\uff0c\u4f46\uff0c\u5982\u679c\u5e0c\u671b\u80fd\u591f\u5bf9 InnoDB \u9501\u6709\u975e\u5e38\u7cfb\u7edf\u7684\u4e86\u89e3\uff0c\u8fd9\u4e5f\u662f\u4e00\u5757\u91cd\u8981\u7684\u201c\u62fc\u56fe\u201d\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>InnoDB \u7684\u9501\u5bb9\u6613\u88ab\u5ffd\u7565\u7684\u7ec6\u8282\u662f\u5173\u4e8e\u201c\u9690\u5f0f\u9501\u201d\uff08\u5373\uff1aimplicit locks\uff09\u7684\u5b58\u5728\u3002\u8868\u73b0\u4e0a\uff0c\u6709\u7684\u9501\u662f\u5b58\u5728\u7684\uff0c\u4f46\u5728\u4f7f\u7528SHOW ENGINE INNODB STATUS\u6216\u8005performance_schema.data_locks\u4e2d\u5374\u67e5\u770b\u4e0d\u5230\u3002\u6700\u4e3a\u5e38\u89c1\u7684\u9690\u5f0f\u9501\u662f\u5728\u5199\u5165\uff08INSERT\uff09\u65f6\uff0c\u5f53\u524d\u4e8b\u52a1\u4f1a\u6301\u6709\u8be5\u8bb0\u5f55\u5bf9\u5e94\u7684\u9501\uff0c\u4f46\u662f\u5728\u7cfb\u7edf\u4e2d\uff0c\u901a\u5e38\u662f\u67e5\u770b\u4e0d\u5230\u7684\u3002\u4f46\uff0c\u5982\u679c\u53d1\u751f\u4e86\u8be5\u9501\u51b2\u7a81\uff08\u6216\u7ade\u4e89\uff09\u65f6\uff0c\u7cfb\u7edf\u4e2d\u5219\u53ef\u4ee5\u770b\u5230\u6b64\u7c7b\u9501\u4fe1\u606f\u3002 \u672c\u6587\u91cd\u73b0\u4e86\u8f83\u4e3a\u5e38\u89c1\u7684\u9690\u5f0f\u9501\u573a\u666f\uff0c\u5305\u62ec\uff1a\u6570\u636e\u5199\u5165\uff08INSERT\uff09\u65f6\u7684\u9690\u5f0f\u9501\u3001\u6839\u636e\u4e3b\u952e\u64cd\u4f5c\u662f\u53ef\u80fd\u4ea7\u751f\u7684\u4e8c\u7ea7\u7d22\u5f15\u9690\u5f0f\u9501\u7b49\u3002\u5e2e\u52a9\u5f00\u53d1\u8005\u80fd\u591f\u66f4\u7cfb\u7edf\u7684\u7406\u89e3\uff0cInnoDB \u7684\u9501\u673a\u5236\u3002 \u5199\u5165\u6570\u636e\u4ea7\u751f\u7684\u9690\u5f0f\u9501 \u51c6\u5907\u6570\u636e \u6784\u5efa\u9690\u5f0f\u9501 \u67e5\u770b\u9501\u4fe1\u606f\uff1a \u53ef\u4ee5\u770b\u5230\uff0c\u5728 data_locks \u8868\u4e2d\u6ca1\u6709\u4efb\u4f55\u5173\u4e8e\u4e8b\u52a1\u4e2d\u5199\u5165\u6570\u636e\u76f8\u5173\u7684\u9501\u3002\u8fd9\u662f\uff0c\u56e0\u4e3a\u8fd9\u662f\u4e00\u4e2a\u9690\u5f0f\u7684\u9501\uff0c\u5728\u6ca1\u6709\u4efb\u4f55\u9501\u7ade\u4e89\u7684\u60c5\u51b5\u4e0b\uff0c\u7cfb\u7edf\u5e76\u4e0d\u4f1a\u5c06\u8be5\u7c7b\u578b\u7684\u9501\u5c55\u793a\u51fa\u6765\uff08\u6ce8\uff1a\u8fd9\u53ef\u80fd\u4e0e\u5e95\u5c42\u7684\u5b58\u50a8\u548c\u5b9e\u73b0\u6709\u5173\uff0c\u9690\u5f0f\u9501\u5728\u5b9e\u73b0\u4e0a\u53ef\u80fd\u5c31\u6ca1\u6709\u201c\u663e\u5f0f\u201d\u7684\u5b58\u50a8\u5728\u9501\u76f8\u5173\u7684\u6570\u636e\u7ed3\u6784\u4e2d\uff09\u3002 \u6784\u5efa\u9501\u7ade\u4e89\/\u9690\u5f0f\u8f6c\u663e\u5f0f \u8fd9\u91cc\u901a\u8fc7\u5728\u53e6\u4e00\u4e2a\u4e8b\u52a1\u4e2d\u5c1d\u8bd5\u5e76\u53d1\u5199\u5165\u4e00\u6761\u51b2\u7a81\u7684\u8bb0\u5f55\uff0c\u6765\u6784\u5efa\u9501\u7ade\u4e89\uff1a 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\u7684\u9501\u7ba1\u7406\u548c\u5b9e\u73b0\u786e\u5b9e\u4e00\u4e2a\u8d85\u7ea7\u590d\u6742\u7684\u90e8\u5206\uff08&#8221;mega-complicated&#8220;\uff09\u3002\u9690\u5f0f\u9501\u7684\u4f7f\u7528\u573a\u666f\u4e5f\u975e\u5e38\u591a\uff0c\u5982\u679c\u5bf9\u6b64\u4e0d\u4e86\u89e3\u7684\u8bdd\uff0c\u90a3\u4e48\u5728\u89c2\u5bdf InnoDB \u7684\u9501\u4fe1\u606f\u65f6\uff0c\u662f\u4f1a\u6709\u5f88\u591a\u7684\u56f0\u60d1\u7684\u3002\u8fd9\u91cc\u518d\u5217\u4e3e\u4e00\u7c7b\u4e5f\u7b97\uff0c\u8f83\u4e3a\u5e38\u7528\u7684\u9690\u5f0f\u9501\uff1a\u201c\u4e3b\u952e\u7d22\u5f15\/\u4e8c\u7ea7\u7d22\u5f15\u201d\u76f8\u5173\u7684\u9690\u5f0f\u8bf4\u3002\u5373\uff1a \u8fd9\u7c7b\u573a\u666f\u7684\u52a0\u9501\uff0c\u901a\u5e38\u90fd\u662f\u4f1a\u5b58\u5728\u9690\u5f0f\u9501\u3002 \u4e3b\u952e\u64cd\u4f5c\u65f6\u4e8c\u7ea7\u7d22\u5f15\u4e0a\u7684\u9690\u5f0f\u9501 \u5728\u4e0b\u9762\u7684\u6d4b\u8bd5\u4e2d\uff0c\u6211\u4eec\u5148\u4e3b\u952e id = 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