{"id":3453,"date":"2019-06-13T19:25:11","date_gmt":"2019-06-13T11:25:11","guid":{"rendered":"https:\/\/damogame.cn\/wordpress\/?p=3453"},"modified":"2019-06-13T19:25:11","modified_gmt":"2019-06-13T11:25:11","slug":"mysql%e7%9a%84innodb%e9%94%81%e6%9c%ba%e5%88%b6%e4%bb%a5%e5%8f%8a%e6%ad%bb%e9%94%81%e5%a4%84%e7%90%86","status":"publish","type":"post","link":"https:\/\/i007.cc\/wordpress\/archives\/3453","title":{"rendered":"MySQL\u7684innoDB\u9501\u673a\u5236\u4ee5\u53ca\u6b7b\u9501\u5904\u7406"},"content":{"rendered":"
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\u539f\u6587\u5730\u5740<\/a><\/p>\n

 <\/p>\n<\/div>\n

\n
\u7f6e\u9876<\/span>\u00a02018\u5e7404\u670817\u65e5 11:20:16<\/span>\u00a0\u888b\u9f20mysql<\/a>\u00a0\u9605\u8bfb\u6570 2911<\/span><\/div>\n
<\/div>\n<\/div>\n<\/div>\n<\/div>\n
\n
\n
\n
<\/div>\n

MySQL\u7684nnoDB\u9501\u673a\u5236<\/p>\n

InnoDB\u4e0eMyISAM\u7684\u6700\u5927\u4e0d\u540c\u6709\u4e24\u70b9\uff1a\u4e00\u662f\u652f\u6301\u4e8b\u52a1\uff08TRANSACTION\uff09\uff1b\u4e8c\u662f\u91c7\u7528\u4e86\u884c\u7ea7\u9501\u3002\u884c\u7ea7\u9501\u4e0e\u8868\u7ea7\u9501\u672c\u6765\u5c31\u6709\u8bb8\u591a\u4e0d\u540c\u4e4b\u5904\uff0cinnodb\u6b63\u5e38\u7684select ID from table where id=1\uff1b\u4e0d\u4f1a\u4e0a\u4efb\u4f55\u9501\uff0c\u63a5\u4e0b\u6765\u8be6\u7ec6\u8ba8\u8bbaInnoDB\u7684\u9501\u95ee\u9898;<\/p>\n

\u4e00\uff1aInnoDB\u884c\u9501\u7684\u4ecb\u7ecd\u3002<\/p>\n

\u5171\u4eab\u9501\uff08S\uff09\uff1a\u5141\u8bb8\u4e00\u4e2a\u4e8b\u52a1\u53bb\u8bfb\u4e00\u884c\uff0c\u963b\u6b62\u5176\u4ed6\u4e8b\u52a1\u83b7\u5f97\u76f8\u540c\u6570\u636e\u96c6\u7684\u6392\u4ed6\u9501,\u4e5f\u5c31\u662f\u6211\u8bfb\u53d6\u7684\u884c\uff0c\u4f60\u4e0d\u80fd\u4fee\u6539\uff1b<\/p>\n

\u6392\u4ed6\u9501\uff08X)\uff1a\u5141\u8bb8\u83b7\u5f97\u6392\u4ed6\u9501\u7684\u4e8b\u52a1\u66f4\u65b0\u6570\u636e\uff0c\u963b\u6b62\u5176\u4ed6\u4e8b\u52a1\u53d6\u5f97\u76f8\u540c\u6570\u636e\u96c6\u7684\u5171\u4eab\u8bfb\u9501\u548c\u6392\u4ed6\u5199\u9501\u3002\u4e5f\u5c31\u662f\u6211\u66f4\u65b0\u7684\u884c\uff0c\u4e0d\u5141\u8bb8\u5176\u4ed6\u7684\u4e8b\u52a1\u8bfb\u53d6\u548c\u66f4\u65b0\u76f8\u540c\u7684\u884c\uff1b<\/p>\n

\u53e6\u5916\uff0c\u4e3a\u4e86\u5141\u8bb8\u884c\u9501\u548c\u8868\u9501\u5171\u5b58\uff0c\u5b9e\u73b0\u591a\u7c92\u5ea6\u9501\u673a\u5236\uff0cInnoDB\u8fd8\u6709\u4e24\u79cd\u5185\u90e8\u4f7f\u7528\u7684\u610f\u5411\u9501\uff08Intention Locks\uff09\uff0c\u8fd9\u4e24\u79cd\u610f\u5411\u9501\u90fd\u662f\u8868\u9501\u3002<\/p>\n

\u610f\u5411\u5171\u4eab\u9501\uff08IS\uff09\uff1a\u4e8b\u52a1\u6253\u7b97\u7ed9\u6570\u636e\u884c\u52a0\u884c\u5171\u4eab\u9501\uff0c\u4e8b\u52a1\u5728\u7ed9\u4e00\u4e2a\u6570\u636e\u884c\u52a0\u5171\u4eab\u9501\u524d\u5fc5\u987b\u5148\u53d6\u5f97\u8be5\u8868\u7684IS\u9501\u3002<\/p>\n

\u610f\u5411\u6392\u4ed6\u9501\uff08IX\uff09\uff1a\u4e8b\u52a1\u6253\u7b97\u7ed9\u6570\u636e\u884c\u52a0\u884c\u6392\u4ed6\u9501\uff0c\u4e8b\u52a1\u5728\u7ed9\u4e00\u4e2a\u6570\u636e\u884c\u52a0\u6392\u4ed6\u9501\u524d\u5fc5\u987b\u5148\u53d6\u5f97\u8be5\u8868\u7684IX\u9501\u3002<\/p>\n

\u610f\u5411\u9501\u662fInnoDB\u81ea\u52a8\u52a0\u7684\uff0c\u4e0d\u9700\u7528\u6237\u5e72\u9884\u3002\u5bf9\u4e8eUPDATE\u3001DELETE\u548cINSERT\u8bed\u53e5\uff0cInnoDB\u4f1a\u81ea\u52a8\u7ed9\u6d89\u53ca\u6570\u636e\u96c6\u52a0\u6392\u4ed6\u9501\uff08X)\uff1b\u5bf9\u4e8e\u666e\u901aSELECT\u8bed\u53e5\uff0cInnoDB\u4e0d\u4f1a\u52a0\u4efb\u4f55\u9501\uff1b\u4e8b\u52a1\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u8bed\u53e5\u663e\u793a\u7ed9\u8bb0\u5f55\u96c6\u52a0\u5171\u4eab\u9501\u6216\u6392\u4ed6\u9501\u3002<\/p>\n

\u5171\u4eab\u9501\uff08S\uff09\uff1aSELECT * FROM table_name WHERE … LOCK IN SHARE MODE\uff1b<\/p>\n

\u6392\u4ed6\u9501\uff08X)\uff1aSELECT * FROM table_name WHERE … FOR UPDATE\uff1b<\/p>\n

InnoDB\u884c\u9501\u6a21\u5f0f\u517c\u5bb9\u6027\u5217\u8868\uff1a<\/p>\n

\u5982\u679c\u4e00\u4e2a\u4e8b\u52a1\u8bf7\u6c42\u7684\u9501\u6a21\u5f0f\u4e0e\u5f53\u524d\u7684\u9501\u517c\u5bb9\uff0cInnoDB\u5c31\u5c06\u8bf7\u6c42\u7684\u9501\u6388\u4e88\u8be5\u4e8b\u52a1\uff1b\u53cd\u4e4b\uff0c\u5982\u679c\u4e24\u8005\u4e0d\u517c\u5bb9\uff0c\u8be5\u4e8b\u52a1\u5c31\u8981\u7b49\u5f85\u9501\u91ca\u653e\u3002<\/p>\n

\u4e8c\uff1a\u5173\u4e8einnodb\u9501\u673a\u5236\uff0c\u5b9e\u73b0\u539f\u7406\uff1a<\/p>\n

InnoDB\u884c\u9501\u662f\u901a\u8fc7\u7ed9\u7d22\u5f15\u4e0a\u7684\u7d22\u5f15\u9879\u52a0\u9501\u6765\u5b9e\u73b0\u7684\uff0c\u8fd9\u4e00\u70b9MySQL\u4e0eOracle\u4e0d\u540c\uff0c\u540e\u8005\u662f\u901a\u8fc7\u5728\u6570\u636e\u5757\u4e2d\u5bf9\u76f8\u5e94\u6570\u636e\u884c\u52a0\u9501\u6765\u5b9e\u73b0\u7684\u3002InnoDB\u8fd9\u79cd\u884c\u9501\u5b9e\u73b0\u7279\u70b9\u610f\u5473\u7740\uff1a\u53ea\u6709\u901a\u8fc7\u7d22\u5f15\u6761\u4ef6\u68c0\u7d22\u6570\u636e\uff0cInnoDB\u624d\u4f7f\u7528\u884c\u7ea7\u9501\uff0c\u5426\u5219\uff0cInnoDB\u5c06\u4f7f\u7528\u8868\u9501\uff01 \u7d22\u5f15\u5206\u4e3a\u4e3b\u952e\u7d22\u5f15\u548c\u4e8c\u7ea7\u7d22\u5f15\u4e24\u79cd\uff0c\u5982\u679c\u4e00\u6761sql\u8bed\u53e5\u64cd\u4f5c\u4e86\u4e3b\u952e\u7d22\u5f15\uff0cMySQL\u5c31\u4f1a\u9501\u5b9a\u8fd9\u6761\u4e3b\u952e\u7d22\u5f15;\u5982\u679c\u4e00\u6761\u8bed\u53e5\u64cd\u4f5c\u4e86\u4e8c\u7ea7\u7d22\u5f15\uff0cMySQL\u4f1a\u5148\u9501\u5b9a\u8be5\u4e8c\u7ea7\u7d22\u5f15\uff0c\u518d\u9501\u5b9a\u76f8\u5173\u7684\u4e3b\u952e\u7d22\u5f15\u3002<\/p>\n

\u7136\u540einnodb\u884c\u9501\u5206\u4e3a\u4e09\u79cd\u60c5\u5f62\uff1a<\/p>\n

1\uff09Record lock \uff1a\u5bf9\u7d22\u5f15\u9879\u52a0\u9501\uff0c\u5373\u9501\u5b9a\u4e00\u6761\u8bb0\u5f55\u3002<\/p>\n

2\uff09Gap lock\uff1a\u5bf9\u7d22\u5f15\u9879\u4e4b\u95f4\u7684\u2018\u95f4\u9699\u2019\u3001\u5bf9\u7b2c\u4e00\u6761\u8bb0\u5f55\u524d\u7684\u95f4\u9699\u6216\u6700\u540e\u4e00\u6761\u8bb0\u5f55\u540e\u7684\u95f4\u9699\u52a0\u9501\uff0c\u5373\u9501\u5b9a\u4e00\u4e2a\u8303\u56f4\u7684\u8bb0\u5f55\uff0c\u4e0d\u5305\u542b\u8bb0\u5f55\u672c\u8eab<\/p>\n

3\uff09Next-key Lock\uff1a\u9501\u5b9a\u4e00\u4e2a\u8303\u56f4\u7684\u8bb0\u5f55\u5e76\u5305\u542b\u8bb0\u5f55\u672c\u8eab\uff08\u4e0a\u9762\u4e24\u8005\u7684\u7ed3\u5408\uff09\u3002<\/p>\n

\u6ce8\u610f\uff1aInnoDB\u9ed8\u8ba4\u7ea7\u522b\u662frepeatable-read\u7ea7\u522b\uff0c\u6240\u4ee5\u4e0b\u9762\u8bf4\u7684\u90fd\u662f\u5728RR\u7ea7\u522b\u4e2d\u7684\u3002<\/p>\n

Next-Key Lock\u662f\u884c\u9501\u4e0e\u95f4\u9699\u9501\u7684\u7ec4\u5408\uff0c\u8fd9\u6837\uff0c\u5f53InnoDB\u626b\u63cf\u7d22\u5f15\u8bb0\u5f55\u7684\u65f6\u5019\uff0c\u4f1a\u9996\u5148\u5bf9\u9009\u4e2d\u7684\u7d22\u5f15\u8bb0\u5f55\u52a0\u4e0a\u884c\u9501\uff08Record Lock\uff09\uff0c\u518d\u5bf9\u7d22\u5f15\u8bb0\u5f55\u4e24\u8fb9\u7684\u95f4\u9699\u52a0\u4e0a\u95f4\u9699\u9501\uff08Gap Lock\uff09\u3002\u5982\u679c\u4e00\u4e2a\u95f4\u9699\u88ab\u4e8b\u52a1T1\u52a0\u4e86\u9501\uff0c\u5176\u5b83\u4e8b\u52a1\u662f\u4e0d\u80fd\u5728\u8fd9\u4e2a\u95f4\u9699\u63d2\u5165\u8bb0\u5f55\u7684<\/p>\n

\u4e3e\u4f8b1\uff1a<\/p>\n

\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u5f20\u8868\uff1a<\/p>\n

+—-+——+<\/p>\n

| id | age |<\/p>\n

+—-+——+<\/p>\n

| 1 | 3 |<\/p>\n

| 2 | 6 |<\/p>\n

| 3 | 9 |<\/p>\n

+—-+——+<\/p>\n

\u8868\u7ed3\u6784\u5982\u4e0b\uff1a<\/p>\n

CREATE TABLE `liuhe` (<\/p>\n

`id` int(11) NOT NULL AUTO_INCREMENT,<\/p>\n

`age` int(11) DEFAULT NULL,<\/p>\n

PRIMARY KEY (`id`),<\/p>\n

KEY `keyname` (`age`)<\/p>\n

) ENGINE=InnoDB AUTO_INCREMENT=302 DEFAULT CHARSET=gbk ;<\/p>\n

\u8fd9\u6837\u6211\u4eecage\u6bb5\u7684\u7d22\u5f15\u5c31\u5206\u4e3a<\/p>\n

(negative infinity, 3],<\/p>\n

(3,6],<\/p>\n

(6,9],<\/p>\n

(9,positive infinity)\uff1b<\/p>\n

\u6211\u4eec\u6765\u770b\u4e00\u4e0b\u51e0\u79cd\u60c5\u51b5\uff1a<\/p>\n

1\uff09\u5f53\u4e8b\u52a1A\u6267\u884c\u4ee5\u4e0b\u8bed\u53e5\uff1a<\/p>\n

mysql> select * from liuhe where age=6 for update ;<\/p>\n

\u4e0d\u4ec5\u4f7f\u7528\u884c\u9501\u9501\u4f4f\u4e86\u76f8\u5e94\u7684\u6570\u636e\u884c\uff0c\u540c\u65f6\u4e5f\u5728\u4e24\u8fb9\u7684\u533a\u95f4\uff0c\uff083,6]\u548c\uff086\uff0c9] \u90fd\u52a0\u5165\u4e86gap\u9501\u3002<\/p>\n

\u8fd9\u6837\u4e8b\u52a1B\u5c31\u65e0\u6cd5\u5728\u8fd9\u4e24\u4e2a\u533a\u95f4insert\u8fdb\u65b0\u6570\u636e\uff0c\u540c\u65f6\u4e5f\u4e0d\u5141\u8bb8 update liuhe set age=5 where id=1\uff08\u56e0\u4e3a\u8fd9\u4e5f\u7c7b\u4f3c\u4e8e\u5728\uff083,6]\u8303\u56f4\u65b0\u589e\uff09,\u4f46\u662f\u4e8b\u52a1B\u53ef\u4ee5\u5728\u4e24\u4e2a\u533a\u95f4\u5916\u7684\u533a\u95f4\u63d2\u5165\u6570\u636e\u3002<\/p>\n

\u5b9e\u9a8c\u5982\u4e0b\uff1a<\/p>\n

\u4e8b\u52a1A:<\/p>\n

mysql> set autocommit=0;<\/p>\n

Query OK, 0 rows affected (0.00 sec)<\/p>\n

mysql> select * from liuhe ;\uff08age\u4e0a\u6709\u7d22\u5f15\uff09<\/p>\n

+—-+——+<\/p>\n

| id | age |<\/p>\n

+—-+——+<\/p>\n

| 1 | 3 |<\/p>\n

| 2 | 6 |<\/p>\n

| 3 | 9 |<\/p>\n

+—-+——+<\/p>\n

4 rows in set (0.00 sec)<\/p>\n

mysql> select * from liuhe where age=6 for update ;<\/p>\n

+—-+——+<\/p>\n

| id | age |<\/p>\n

+—-+——+<\/p>\n

| 2 | 6 |<\/p>\n

+—-+——+<\/p>\n

1 row in set (0.00 sec)<\/p>\n

\u4e8b\u52a1B\uff0c\u5c1d\u8bd5insert age=5\u7684\u6570\u636e\uff0c \u786e\u5b9e\u6709\u9501\u7b49\u5f85\uff0c\u8bf4\u660e\u786e\u5b9e\uff083,6]\u4e0a\u533a\u95f4\u9501\uff0c\u9632\u6b62\u5728\u8fd9\u4e2a\u533a\u95f4\u63d2\u5165\uff1b<\/p>\n

mysql> insert into liuhe (id,age) values (5,5);<\/p>\n

\u67e5\u770b\u4e8b\u52a1\u72b6\u6001\uff0c\u53d1\u73b0\u786e\u5b9e\u662f\u7b49\u5f85\uff1b<\/p>\n

mysql> select * from INNODB_TRX\\G;<\/p>\n

*************************** 1. row ***************************<\/p>\n

trx_id: 27162<\/p>\n

trx_state:LOCK WAIT<\/p>\n

trx_started: 2018-04-06 00:03:39<\/p>\n

trx_requested_lock_id: 27162:529:4:3<\/p>\n

trx_wait_started: 2018-04-06 00:03:39<\/p>\n

trx_weight: 3<\/p>\n

trx_mysql_thread_id: 46<\/p>\n

trx_query: insert into liuhe (id,age) values (5,5)<\/p>\n

trx_operation_state: inserting<\/p>\n

trx_tables_in_use: 1<\/p>\n

trx_tables_locked: 1<\/p>\n

trx_lock_structs: 2<\/p>\n

trx_lock_memory_bytes: 360<\/p>\n

trx_rows_locked: 1<\/p>\n

trx_rows_modified: 1<\/p>\n

trx_concurrency_tickets: 0<\/p>\n

trx_isolation_level: REPEATABLE READ<\/p>\n

trx_unique_checks: 1<\/p>\n

trx_foreign_key_checks: 1<\/p>\n

trx_last_foreign_key_error: NULL<\/p>\n

trx_adaptive_hash_latched: 0<\/p>\n

trx_adaptive_hash_timeout: 10000<\/p>\n

trx_is_read_only: 0<\/p>\n

trx_autocommit_non_locking: 0<\/p>\n

\u5982\u4e0a\u8bf4\u660e\uff1a\uff083,6]\u548c\uff086\uff0c9] \u90fd\u52a0\u5165\u4e86gap\u9501\u3002\u8fd9\u6837\u4e8b\u52a1B\u5c31\u65e0\u6cd5\u5728\u8fd9\u4e24\u4e2a\u533a\u95f4insert\u8fdb\u65b0\u6570\u636e,\u4f46\u662f\u4e8b\u52a1B\u53ef\u4ee5\u5728\u4e24\u4e2a\u533a\u95f4\u5916\u7684\u533a\u95f4\u63d2\u5165\u6570\u636e<\/p>\n

2\uff09\u5f53\u4e8b\u52a1A\u6267\u884c\u5982\u4e0b\u8bed\u53e5\uff1a<\/p>\n

select * from fenye where age=7 for update ;<\/p>\n

\u90a3\u4e48\u5c31\u4f1a\u7ed9(6,9]\u8fd9\u4e2a\u533a\u95f4\u52a0\u9501\uff0c\u522b\u7684\u4e8b\u52a1\u65e0\u6cd5\u5728\u6b64\u533a\u95f4\u63d2\u5165\u6216\u66f4\u65b0\u6570\u636e\u3002<\/p>\n

3\uff09\u5f53\u4e8b\u52a1A\u6267\u884c:<\/p>\n

select * from fenye where age=100 for update ;<\/p>\n

\u90a3\u4e48\u52a0\u9501\u533a\u95f4\u5c31\u662f(9,positive infinity)\uff0c\u522b\u7684\u4e8b\u52a1\u65e0\u6cd5\u5728\u6b64\u533a\u95f4\u63d2\u5165\u65b0\u6570\u636e\u540c\u65f6\u4e5f\u4e0d\u5141\u8bb8\u66f4\u65b0\u5df2\u6709\u7684\u6570\u636e\u5230\u8fd9\u4e2a\u533a\u95f4\uff0c\u4e5f\u5c31\u662f update liuhe set age=19 where id=1\u662f\u4e0d\u5141\u8bb8\u7684\uff08\u56e0\u4e3a\u8fd9\u4e5f\u7c7b\u4f3c\u4e8e\u65b0\u589e\uff09\u3002<\/p>\n

\u6574\u4e2a\u4e3e\u4f8b1\u8bf4\u660e\uff1a<\/p>\n

\u884c\u9501\u9632\u6b62\u522b\u7684\u4e8b\u52a1\u4fee\u6539\u6216\u5220\u9664\uff0cGAP\u9501\u9632\u6b62\u522b\u7684\u4e8b\u52a1\u65b0\u589e(\u9632\u6b62\u65b0\u589e\u5305\u62ecinsert\u548cupdate\u5df2\u6709\u6570\u636e\u5230\u8fd9\u4e2a\u8303\u56f4\u4e2d\uff09\uff0c\u884c\u9501\u548cGAP\u9501\u7ed3\u5408\u5f62\u6210\u7684\u7684Next-Key\u9501\u5171\u540c\u89e3\u51b3\u4e86RR\u7ea7\u522b\u5728\u5199\u6570\u636e\u65f6\u7684\u90e8\u5206\u5e7b\u8bfb\u95ee\u9898\uff0c\u4e00\u5b9a\u6ce8\u610f\u53ea\u662f\u90e8\u5206\u5e7b\u8bfb\u95ee\u9898\uff1b<\/p>\n

\u4e3e\u4f8b2\uff1a<\/p>\n

\u5047\u5982emp\u8868\u4e2d\u53ea\u6709101\u6761\u8bb0\u5f55\uff0c\u5176empid\u7684\u503c\u5206\u522b\u662f 1,2,…,100,101\uff0c\u4e0b\u9762\u7684SQL\uff1a<\/p>\n

Select * from emp where empid > 100 for update;<\/p>\n

\u662f\u4e00\u4e2a\u8303\u56f4\u6761\u4ef6\u7684\u68c0\u7d22\uff0cInnoDB\u4e0d\u4ec5\u4f1a\u5bf9\u7b26\u5408\u6761\u4ef6\u7684empid\u503c\u4e3a101\u7684\u8bb0\u5f55\u52a0\u9501\uff0c\u4e5f\u4f1a\u5bf9empid\u5927\u4e8e101\uff08\u8fd9\u4e9b\u8bb0\u5f55\u5e76\u4e0d\u5b58\u5728\uff09\u7684\u201c\u95f4\u9699\u201d\u52a0\u9501\uff0c\u8fd9\u6837\u5176\u4ed6\u4e8b\u52a1\u5c31\u4e0d\u80fd\u5728empid > 100\u8303\u56f4insert\u6570\u636e\u4e86\u3002<\/p>\n

InnoDB \u4f7f\u7528\u95f4\u9699\u9501\u7684\u76ee\u7684\uff0c\u4e00\u65b9\u9762\u662f\u4e3a\u4e86\u9632\u6b62\u5e7b\u8bfb\uff0c\u4ee5\u6ee1\u8db3\u76f8\u5173\u9694\u79bb\u7ea7\u522b\u7684\u8981\u6c42\uff0c\u5bf9\u4e8e\u4e0a\u9762\u7684\u4f8b\u5b50\uff0c\u8981\u662f\u4e0d\u4f7f\u7528\u95f4\u9699\u9501\uff0c\u5982\u679c\u5176\u4ed6\u4e8b\u52a1\u63d2\u5165\u4e86empid\u5927\u4e8e100\u7684\u4efb\u4f55 \u8bb0\u5f55\uff0c\u90a3\u4e48\u672c\u4e8b\u52a1\u5982\u679c\u518d\u6b21\u6267\u884c\u4e0a\u8ff0\u8bed\u53e5\uff0c\u5c31\u4f1a\u53d1\u751f\u5e7b\u8bfb<\/p>\n

\u4e3e\u4f8b3<\/p>\n

\u5047\u5982emp\u8868\u4e2d\u53ea\u6709101\u6761\u8bb0\u5f55\uff0c\u5176empid\u7684\u503c\u5206\u522b\u662f 1,5,7,9,10,19\uff0c\u90a3\u4e48\u4e0b\u9762\u7684sql:<\/p>\n

select * from emp where empid >2 and empid <16 for update ;<\/p>\n

\u90a3\u4e48InnoDB\u4e0d\u4ec5\u4f1a\u5bf9\u7b26\u5408\u6761\u4ef6\u7684empid\u503c\u4e3a5,7,9,10\u7684\u8bb0\u5f55\u52a0\u9501\uff0c\u4e5f\u4f1a\u5bf9\uff082\uff0c16\uff09\u8fd9\u4e2a\u533a\u95f4\u52a0\u201c\u95f4\u9699\u201d\u52a0\u9501\uff0c\u8fd9\u6837\u5176\u4ed6\u4e8b\u52a1\u5c31\u4e0d\u80fd\u5728\uff082\uff0c16)\u8303\u56f4insert\u6570\u636e\u4e86,\u5e76\u4e14\u4e5f\u4e0d\u5141\u8bb8\u66f4\u65b0\u5df2\u6709\u7684\u6570\u636e\u5230\u8fd9\u4e2a\u533a\u95f4\uff1b<\/p>\n

\u4e09\uff1a\u5173\u4e8einnodb\u9501\u673a\u5236\u9700\u8981\u6ce8\u610f\u7684\u662f\uff1a<\/p>\n

1\uff09InnoDB\u884c\u9501\u662f\u901a\u8fc7\u7ed9\u7d22\u5f15\u9879\u52a0\u9501\u5b9e\u73b0\u7684\uff0c\u5982\u679c\u6ca1\u6709\u7d22\u5f15\uff0cInnoDB\u4f1a\u901a\u8fc7\u9690\u85cf\u7684\u805a\u7c07\u7d22\u5f15\u6765\u5bf9\u8bb0\u5f55\u52a0\u9501\u3002\u4e5f\u5c31\u662f\u8bf4\uff1a\u5982\u679c\u4e0d\u901a\u8fc7\u7d22\u5f15\u6761\u4ef6\u68c0\u7d22\u6570\u636e\uff0c\u90a3\u4e48InnoDB\u5c06\u5bf9\u8868\u4e2d\u6240\u6709\u6570\u636e\u52a0\u9501\uff0c\u5b9e\u9645\u6548\u679c\u8ddf\u8868\u9501\u4e00\u6837\u3002<\/p>\n

2\uff09\u7531\u4e8eMySQL\u7684\u884c\u9501\u662f\u9488\u5bf9\u7d22\u5f15\u52a0\u7684\u9501\uff0c\u4e0d\u662f\u9488\u5bf9\u8bb0\u5f55\u52a0\u7684\u9501\uff0c\u6240\u4ee5\u867d\u7136\u662f\u8bbf\u95ee\u4e0d\u540c\u884c\u7684\u8bb0\u5f55\uff0c\u4f46\u662f\u5982\u679c\u662f\u4f7f\u7528\u76f8\u540c\u7684\u7d22\u5f15\u952e\uff0c\u662f\u4f1a\u51fa\u73b0\u9501\u51b2\u7a81\u7684\u3002\u8bf4\u767d\u4e86\u5c31\u662f\uff0cwhere id=1 for update \u4f1a\u9501\u5b9a\u6240\u6709id=1\u7684\u6570\u636e\u884c\uff0c\u5982\u679c\u662fwhere id=1 and name=’liuwenhe’ for update,\u8fd9\u6837\u4f1a\u628a\u6240\u6709 id=1\u4ee5\u53ca\u6240\u6709name=’liuwenhe’\u7684\u884c\u90fd\u4e0a\u6392\u5b83\u9501\uff1b<\/p>\n

3\uff09\u5f53\u8868\u6709\u591a\u4e2a\u7d22\u5f15\u7684\u65f6\u5019\uff0c\u4e0d\u540c\u7684\u4e8b\u52a1\u53ef\u4ee5\u4f7f\u7528\u4e0d\u540c\u7684\u7d22\u5f15\u9501\u5b9a\u4e0d\u540c\u7684\u884c\uff0c\u53e6\u5916\uff0c\u4e0d\u8bba\u662f\u4f7f\u7528\u4e3b\u952e\u7d22\u5f15\u3001\u552f\u4e00\u7d22\u5f15\u6216\u666e\u901a\u7d22\u5f15\uff0cInnoDB\u90fd\u4f1a\u4f7f\u7528\u884c\u9501\u6765\u5bf9\u6570\u636e\u52a0\u9501\u3002<\/p>\n

4\uff09\u5373\u4fbf\u5728\u6761\u4ef6\u4e2d\u4f7f\u7528\u4e86\u7d22\u5f15\u5b57\u6bb5\uff0c\u4f46\u662f\u5426\u4f7f\u7528\u7d22\u5f15\u6765\u68c0\u7d22\u6570\u636e\u662f\u7531MySQL\u4f18\u5316\u5668\u901a\u8fc7\u5224\u65ad\u4e0d\u540c\u6267\u884c\u8ba1\u5212\u7684\u4ee3\u4ef7\u6765\u51b3\u5b9a\u7684\uff0c\u5982\u679cMySQL\u8ba4\u4e3a\u5168\u8868\u626b\u63cf\u6548\u7387\u66f4\u9ad8\uff0c\u6bd4\u5982\u5bf9\u4e00\u4e9b\u5f88\u5c0f\u7684\u8868\uff0c\u5b83\u5c31\u4e0d\u4f1a\u4f7f\u7528\u7d22\u5f15\uff0c\u6216\u8005\u996e\u98df\u8f6c\u6362\uff0c\u6216\u8005like\u767e\u5206\u53f7\u5728\u524d\u7b49\u7b49\uff0c\u8fd9\u79cd\u60c5\u51b5\u4e0bInnoDB\u5c06\u4f7f\u7528\u8868\u9501\uff0c\u800c\u4e0d\u662f\u884c\u9501\u3002\u56e0\u6b64\uff0c\u5728\u5206\u6790\u9501\u51b2\u7a81\u65f6\uff0c\u522b\u5fd8\u4e86\u68c0\u67e5SQL\u7684\u6267\u884c\u8ba1\u5212\uff0c\u4ee5\u786e\u8ba4\u662f\u5426\u771f\u6b63\u4f7f\u7528\u4e86\u7d22\u5f15\u3002<\/p>\n

\u56db\uff1a\u67e5\u770binnodb\u7684\u76f8\u5173\u9501\uff1b<\/p>\n

1\uff09\u67e5\u8be2\u76f8\u5173\u7684\u9501\uff1a<\/p>\n

information_schema \u5e93\u4e2d\u589e\u52a0\u4e86\u4e09\u4e2a\u5173\u4e8e\u9501\u7684\u8868\uff1a<\/p>\n

innodb_trx\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 ## \u5f53\u524d\u8fd0\u884c\u7684\u6240\u6709\u4e8b\u52a1 \uff0c\u8fd8\u6709\u5177\u4f53\u7684\u8bed\u53e5\uff0c<\/p>\n

innodb_locks\u00a0\u00a0\u00a0\u00a0\u00a0 ## \u5f53\u524d\u51fa\u73b0\u7684\u9501\uff0c\u53ea\u6709<\/p>\n

innodb_lock_waits\u00a0 ## \u9501\u7b49\u5f85\u7684\u5bf9\u5e94\u5173\u7cfb<\/p>\n

\u770b\u4e00\u4e0b\u8868\u7ed3\u6784\uff1a<\/p>\n

root@127.0.0.1<\/a>\u00a0: information_schema 13:28:38> desc innodb_locks;<\/p>\n

+\u2014\u2014\u2014\u2014-+\u2014\u2014\u2014\u2014\u2014\u2014\u2014+\u2014\u2014+\u2014\u2013+\u2014\u2014\u2014+\u2014\u2014-+<\/p>\n

| Field\u00a0\u00a0\u00a0\u00a0\u00a0 | Type\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 | Null | Key | Default | Extra |<\/p>\n

+\u2014\u2014\u2014\u2014-+\u2014\u2014\u2014\u2014\u2014\u2014\u2014+\u2014\u2014+\u2014\u2013+\u2014\u2014\u2014+\u2014\u2014-+<\/p>\n

| lock_id\u00a0\u00a0\u00a0 | varchar(81)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 | NO\u00a0 |\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0 |#\u9501ID<\/p>\n

| lock_trx_id | varchar(18)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 | NO\u00a0 |\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0 |#\u62e5\u6709\u9501\u7684\u4e8b\u52a1ID<\/p>\n

| lock_mode\u00a0 | varchar(32)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 | NO\u00a0 |\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0 |#\u9501\u6a21\u5f0f<\/p>\n

| lock_type\u00a0 | varchar(32)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 | NO\u00a0 |\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0 |#\u9501\u7c7b\u578b<\/p>\n

| lock_table\u00a0 | varchar(1024)\u00a0\u00a0\u00a0\u00a0\u00a0 | NO\u00a0 |\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0 |#\u88ab\u9501\u7684\u8868<\/p>\n

| lock_index\u00a0 | varchar(1024)\u00a0\u00a0\u00a0\u00a0\u00a0 | YES\u00a0 |\u00a0\u00a0\u00a0 | NULL\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0 |#\u88ab\u9501\u7684\u7d22\u5f15<\/p>\n

| lock_space\u00a0 | bigint(21) unsigned | YES\u00a0 |\u00a0\u00a0\u00a0 | NULL\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0 |#\u88ab\u9501\u7684\u8868\u7a7a\u95f4\u53f7<\/p>\n

| lock_page\u00a0 | bigint(21) unsigned | YES\u00a0 |\u00a0\u00a0\u00a0 | NULL\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0 |#\u88ab\u9501\u7684\u9875\u53f7<\/p>\n

| lock_rec\u00a0\u00a0\u00a0 | bigint(21) unsigned | YES\u00a0 |\u00a0\u00a0\u00a0 | NULL\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0 |#\u88ab\u9501\u7684\u8bb0\u5f55\u53f7<\/p>\n

| lock_data\u00a0 | varchar(8192)\u00a0\u00a0\u00a0\u00a0\u00a0 | YES\u00a0 |\u00a0\u00a0\u00a0 | NULL\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0 |#\u88ab\u9501\u7684\u6570\u636e<\/p>\n

+\u2014\u2014\u2014\u2014-+\u2014\u2014\u2014\u2014\u2014\u2014\u2014+\u2014\u2014+\u2014\u2013+\u2014\u2014\u2014+\u2014\u2014-+<\/p>\n

10 rows in set (0.00 sec)<\/p>\n

root@127.0.0.1<\/a>\u00a0: information_schema 13:28:56> desc innodb_lock_waits;<\/p>\n

+\u2014\u2014\u2014\u2014\u2014\u2014-+\u2014\u2014\u2014\u2014-+\u2014\u2014+\u2014\u2013+\u2014\u2014\u2014+\u2014\u2014-+<\/p>\n

| Field\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 | Type\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 | Null | Key | Default | Extra |<\/p>\n

+\u2014\u2014\u2014\u2014\u2014\u2014-+\u2014\u2014\u2014\u2014-+\u2014\u2014+\u2014\u2013+\u2014\u2014\u2014+\u2014\u2014-+<\/p>\n

| requesting_trx_id | varchar(18) | NO\u00a0 |\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0 |#\u8bf7\u6c42\u9501\u7684\u4e8b\u52a1ID\uff08\u4e5f\u5c31\u662f\u7b49\u5f85\u9501\u7684id\uff09<\/p>\n

| requested_lock_id | varchar(81) | NO\u00a0 |\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0 |#\u8bf7\u6c42\u9501\u7684\u9501ID<\/p>\n

| blocking_trx_id\u00a0 | varchar(18) | NO\u00a0 |\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0 |#\u5f53\u524d\u62e5\u6709\u9501\u7684\u4e8b\u52a1ID<\/p>\n

| blocking_lock_id\u00a0 | varchar(81) | NO\u00a0 |\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0 |#\u5f53\u524d\u62e5\u6709\u9501\u7684\u9501ID<\/p>\n

+\u2014\u2014\u2014\u2014\u2014\u2014-+\u2014\u2014\u2014\u2014-+\u2014\u2014+\u2014\u2013+\u2014\u2014\u2014+\u2014\u2014-+<\/p>\n

4 rows in set (0.00 sec)<\/p>\n

 <\/p>\n

root@127.0.0.1<\/a>\u00a0: information_schema 13:29:05> desc innodb_trx ;<\/p>\n

+\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014-+\u2014\u2014\u2014\u2014\u2014\u2014\u2014+\u2014\u2014+\u2014\u2013+\u2014\u2014\u2014\u2014\u2014\u2014\u2014+\u2014\u2014-+<\/p>\n

| Field\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 | Type\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 | Null | Key | Default\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 | Extra |<\/p>\n

+\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014-+\u2014\u2014\u2014\u2014\u2014\u2014\u2014+\u2014\u2014+\u2014\u2013+\u2014\u2014\u2014\u2014\u2014\u2014\u2014+\u2014\u2014-+<\/p>\n

| trx_id\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 | varchar(18)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 | NO\u00a0 |\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0 |#\u4e8b\u52a1ID<\/p>\n

| trx_state\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 | varchar(13)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 | NO\u00a0 |\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |#\u4e8b\u52a1\u72b6\u6001\uff1a \u6709\u9501\u5c31\u663e\u793aLOCK WAIT<\/p>\n

| trx_started\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 | datetime\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 | NO\u00a0 |\u00a0\u00a0\u00a0 | 0000-00-00 00:00:00 |\u00a0\u00a0\u00a0\u00a0\u00a0 |#\u4e8b\u52a1\u5f00\u59cb\u65f6\u95f4\uff1b<\/p>\n

| trx_requested_lock_id\u00a0\u00a0\u00a0\u00a0\u00a0 | varchar(81)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 | YES\u00a0 |\u00a0\u00a0\u00a0 | NULL\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0 |#innodb_locks.lock_id<\/p>\n

| trx_wait_started\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 | datetime\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 | YES\u00a0 |\u00a0\u00a0\u00a0 | NULL\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0 |#\u4e8b\u52a1\u5f00\u59cb\u7b49\u5f85\u7684\u65f6\u95f4<\/p>\n

| trx_weight\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 | bigint(21) unsigned | NO\u00a0 |\u00a0\u00a0\u00a0 | 0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0 |#<\/p>\n

| trx_mysql_thread_id\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 | bigint(21) unsigned | NO\u00a0 |\u00a0\u00a0\u00a0 | 0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0 |#\u4e8b\u52a1\u7ebf\u7a0bID<\/p>\n

| trx_query\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 | varchar(1024)\u00a0\u00a0\u00a0\u00a0\u00a0 | YES\u00a0 |\u00a0\u00a0\u00a0 | NULL\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0 |#\u5177\u4f53SQL\u8bed\u53e5<\/p>\n

| trx_operation_state\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 | varchar(64)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 | YES\u00a0 |\u00a0\u00a0\u00a0 | NULL\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0 |#\u4e8b\u52a1\u5f53\u524d\u64cd\u4f5c\u72b6\u6001<\/p>\n

| trx_tables_in_use\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 | bigint(21) unsigned | NO\u00a0 |\u00a0\u00a0\u00a0 | 0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0 |#\u4e8b\u52a1\u4e2d\u6709\u591a\u5c11\u4e2a\u8868\u88ab\u4f7f\u7528<\/p>\n

| trx_tables_locked\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 | bigint(21) unsigned | NO\u00a0 |\u00a0\u00a0\u00a0 | 0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0 |#\u4e8b\u52a1\u62e5\u6709\u591a\u5c11\u4e2a\u9501<\/p>\n

| trx_lock_structs\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 | bigint(21) unsigned | NO\u00a0 |\u00a0\u00a0\u00a0 | 0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0 |#<\/p>\n

| trx_lock_memory_bytes\u00a0\u00a0\u00a0\u00a0\u00a0 | bigint(21) unsigned | NO\u00a0 |\u00a0\u00a0\u00a0 | 0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0 |#\u4e8b\u52a1\u9501\u4f4f\u7684\u5185\u5b58\u5927\u5c0f\uff08B\uff09<\/p>\n

| trx_rows_locked\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 | bigint(21) unsigned | NO\u00a0 |\u00a0\u00a0\u00a0 | 0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0 |#\u4e8b\u52a1\u9501\u4f4f\u7684\u884c\u6570<\/p>\n

| trx_rows_modified\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 | bigint(21) unsigned | NO\u00a0 |\u00a0\u00a0\u00a0 | 0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0 |#\u4e8b\u52a1\u66f4\u6539\u7684\u884c\u6570<\/p>\n

| trx_concurrency_tickets\u00a0\u00a0\u00a0 | bigint(21) unsigned | NO\u00a0 |\u00a0\u00a0\u00a0 | 0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0 |#\u4e8b\u52a1\u5e76\u53d1\u7968\u6570<\/p>\n

| trx_isolation_level\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 | varchar(16)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 | NO\u00a0 |\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0 |#\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b<\/p>\n

| trx_unique_checks\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 | int(1)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 | NO\u00a0 |\u00a0\u00a0\u00a0 | 0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0 |#\u662f\u5426\u552f\u4e00\u6027\u68c0\u67e5<\/p>\n

| trx_foreign_key_checks\u00a0\u00a0\u00a0 | int(1)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 | NO\u00a0 |\u00a0\u00a0\u00a0 | 0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0 |#\u662f\u5426\u5916\u952e\u68c0\u67e5<\/p>\n

| trx_last_foreign_key_error | varchar(256)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 | YES\u00a0 |\u00a0\u00a0\u00a0 | NULL\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0 |#\u6700\u540e\u7684\u5916\u952e\u9519\u8bef<\/p>\n

| trx_adaptive_hash_latched\u00a0 | int(1)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 | NO\u00a0 |\u00a0\u00a0\u00a0 | 0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0 |#<\/p>\n

| trx_adaptive_hash_timeout\u00a0 | bigint(21) unsigned | NO\u00a0 |\u00a0\u00a0\u00a0 | 0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |\u00a0\u00a0\u00a0\u00a0\u00a0 |#<\/p>\n

+\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014\u2014-+\u2014\u2014\u2014\u2014\u2014\u2014\u2014+\u2014\u2014+\u2014\u2013+\u2014\u2014\u2014\u2014\u2014\u2014\u2014+\u2014\u2014-+<\/p>\n

22 rows in set (0.01 sec)<\/p>\n

mysql> show processlist; ##\u53ef\u4ee5\u770b\u51fa\u6765\uff0c<\/p>\n

\u6216\u8005<\/p>\n

mysql> show engine innodb status\\G ##\u4e5f\u53ef\u4ee5\u8981\u770b\u51fa\u76f8\u5173\u6b7b\u9501\u7684\u95ee\u9898<\/p>\n

\u6216\u8005\uff1a<\/p>\n

mysql> select ID,STATE from information_schema.processlist where user=’system user’;<\/p>\n

mysql> select concat(‘KILL ‘,id,’;’) from information_schema.processlist where user=’system user’;<\/p>\n

+————————+<\/p>\n

| concat(‘KILL ‘,id,’;’) |<\/p>\n

+————————+<\/p>\n

| KILL 3101;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |<\/p>\n

| KILL 2946;\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 |<\/p>\n

+————————+<\/p>\n

2 rows in set (0.00 sec)<\/p>\n

\u6279\u91cfkill\u591a\u4e2a\u8fdb\u7a0b\u3002<\/p>\n

mysql>select concat(‘KILL ‘,id,’;’) from information_schema.processlist where user=’root’ into outfile ‘\/tmp\/a.txt’;<\/p>\n

Query OK, 2 rows affected (0.00 sec)<\/p>\n

\u4e94\uff1a\u5173\u4e8e\u6b7b\u9501\uff1a<\/p>\n

MyISAM\u8868\u9501\u662fdeadlock free\u7684\uff0c\u8fd9\u662f\u56e0\u4e3aMyISAM\u603b\u662f\u4e00\u6b21\u83b7\u5f97\u6240\u9700\u7684\u5168\u90e8\u9501\uff0c\u8981\u4e48\u5168\u90e8\u6ee1\u8db3\uff0c\u8981\u4e48\u7b49\u5f85\uff0c\u56e0\u6b64\u4e0d\u4f1a\u51fa\u73b0\u6b7b\u9501\u3002\u4f46\u5728InnoDB\u4e2d\uff0c\u9664\u5355\u4e2aSQL\u7ec4\u6210\u7684\u4e8b\u52a1\u5916\uff0c\u9501\u662f\u9010\u6b65\u83b7\u5f97\u7684\uff0c\u8fd9\u5c31\u51b3\u5b9a\u4e86\u5728InnoDB\u4e2d\u53d1\u751f\u6b7b\u9501\u662f\u53ef\u80fd\u7684\u3002<\/p>\n

\u53d1\u751f\u6b7b\u9501\u540e\uff0cInnoDB\u4e00\u822c\u90fd\u80fd\u81ea\u52a8\u68c0\u6d4b\u5230\uff0c\u5e76\u4f7f\u4e00\u4e2a\u4e8b\u52a1\u91ca\u653e\u9501\u5e76\u56de\u9000\uff0c\u53e6\u4e00\u4e2a\u4e8b\u52a1\u83b7\u5f97\u9501\uff0c\u7ee7\u7eed\u5b8c\u6210\u4e8b\u52a1\u3002\u4f46\u5728\u6d89\u53ca\u5916\u90e8\u9501\uff0c\u6216\u6d89\u53ca\u8868\u9501\u7684\u60c5\u51b5\u4e0b\uff0cInnoDB\u5e76\u4e0d\u80fd\u5b8c\u5168\u81ea\u52a8\u68c0\u6d4b\u5230\u6b7b\u9501\uff0c\u8fd9\u9700\u8981\u901a\u8fc7\u8bbe\u7f6e\u9501\u7b49\u5f85\u8d85\u65f6\u53c2\u6570 innodb_lock_wait_timeout\u6765\u89e3\u51b3\u3002\u9700\u8981\u8bf4\u660e\u7684\u662f\uff0c\u8fd9\u4e2a\u53c2\u6570\u5e76\u4e0d\u662f\u53ea\u7528\u6765\u89e3\u51b3\u6b7b\u9501\u95ee\u9898\uff0c\u5728\u5e76\u53d1\u8bbf\u95ee\u6bd4\u8f83\u9ad8\u7684\u60c5\u51b5\u4e0b\uff0c\u5982\u679c\u5927\u91cf\u4e8b\u52a1\u56e0\u65e0\u6cd5\u7acb\u5373\u83b7\u5f97\u6240\u9700\u7684\u9501\u800c\u6302\u8d77\uff0c\u4f1a\u5360\u7528\u5927\u91cf\u8ba1\u7b97\u673a\u8d44\u6e90\uff0c\u9020\u6210\u4e25\u91cd\u6027\u80fd\u95ee\u9898\uff0c\u751a\u81f3\u62d6\u8de8\u6570\u636e\u5e93\u3002\u6211\u4eec\u901a\u8fc7\u8bbe\u7f6e\u5408\u9002\u7684\u9501\u7b49\u5f85\u8d85\u65f6\u9608\u503c\uff0c\u53ef\u4ee5\u907f\u514d\u8fd9\u79cd\u60c5\u51b5\u53d1\u751f\u3002<\/p>\n

\u901a\u5e38\u6765\u8bf4\uff0c\u6b7b\u9501\u90fd\u662f\u5e94\u7528\u8bbe\u8ba1\u7684\u95ee\u9898\uff0c\u901a\u8fc7\u8c03\u6574\u4e1a\u52a1\u6d41\u7a0b\u3001\u6570\u636e\u5e93\u5bf9\u8c61\u8bbe\u8ba1\u3001\u4e8b\u52a1\u5927\u5c0f\uff0c\u4ee5\u53ca\u8bbf\u95ee\u6570\u636e\u5e93\u7684SQL\u8bed\u53e5\uff0c\u7edd\u5927\u90e8\u5206\u6b7b\u9501\u90fd\u53ef\u4ee5\u907f\u514d\u3002<\/p>\n

\u4e0b\u9762\u5c31\u901a\u8fc7\u5b9e\u4f8b\u6765\u4ecb\u7ecd\u51e0\u79cd\u907f\u514d\u6b7b\u9501\u7684\u5e38\u7528\u65b9\u6cd5\u3002<\/p>\n

\uff081\uff09\u5728\u5e94\u7528\u4e2d\uff0c\u5982\u679c\u4e0d\u540c\u7684\u7a0b\u5e8f\u4f1a\u5e76\u53d1\u5b58\u53d6\u591a\u4e2a\u8868\uff0c\u5e94\u5c3d\u91cf\u7ea6\u5b9a\u4ee5\u76f8\u540c\u7684\u987a\u5e8f\u6765\u8bbf\u95ee\u8868\uff0c\u8fd9\u6837\u53ef\u4ee5\u5927\u5927\u964d\u4f4e\u4ea7\u751f\u6b7b\u9501\u7684\u673a\u4f1a\u3002<\/p>\n

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\u5982\u679c\u51fa\u73b0\u6b7b\u9501\uff0c\u53ef\u4ee5\u7528mysql> show engine innodb status\\G\u547d\u4ee4\u6765\u786e\u5b9a\u6700\u540e\u4e00\u4e2a\u6b7b\u9501\u4ea7\u751f\u7684\u539f\u56e0\u3002\u8fd4\u56de\u7ed3\u679c\u4e2d\u5305\u62ec\u6b7b\u9501\u76f8\u5173\u4e8b\u52a1\u7684\u8be6\u7ec6\u4fe1\u606f\uff0c\u5982\u5f15\u53d1\u6b7b\u9501\u7684SQL\u8bed\u53e5\uff0c\u4e8b\u52a1\u5df2\u7ecf\u83b7\u5f97\u7684\u9501\uff0c\u6b63\u5728\u7b49\u5f85\u4ec0\u4e48\u9501\uff0c\u4ee5\u53ca\u88ab\u56de\u6eda\u7684\u4e8b\u52a1\u7b49\u3002\u636e\u6b64\u53ef\u4ee5\u5206\u6790\u6b7b\u9501\u4ea7\u751f\u7684\u539f\u56e0\u548c\u6539\u8fdb\u63aa\u65bd\u3002<\/p>\n

\u603b\u7ed3\uff1aMySQL innodb\u5f15\u64ce\u7684\u9501\u673a\u5236\u6bd4myisam\u5f15\u64ce\u673a\u5236\u590d\u6742\uff0c\u4f46\u662finnodb\u5f15\u64ce\u652f\u6301\u66f4\u7ec6\u7c92\u5ea6\u7684\u9501\u673a\u5236\uff0c\u5f53\u7136\u4e5f\u4f1a\u5e26\u6765\u66f4\u591a\u7ef4\u62a4\u7684\u4ee3\u4ef7\uff1b\u7136\u540einnodb\u7684\u884c\u7ea7\u522b\u662f\u501f\u52a9\u5bf9\u7d22\u5f15\u9879\u52a0\u9501\u5b9e\u73b0\u7684\uff0c\u503c\u5f97\u6ce8\u610f\u7684\u4e8b\u5982\u679c\u8868\u6ca1\u6709\u7d22\u5f15\uff0c\u90a3\u4e48\u5c31\u4f1a\u4e0a\u8868\u7ea7\u522b\u7684\u9501\uff0c\u540c\u65f6\u501f\u52a9\u884c\u7ea7\u9501\u4e2dgap\u9501\u6765\u89e3\u51b3\u90e8\u5206\u5e7b\u8bfb\u7684\u95ee\u9898\u3002\u53ea\u8981\u77e5\u9053MySQL innodb\u4e2d\u7684\u9501\u7684\u673a\u5236\u539f\u7406\uff0c\u90a3\u4e48\u518d\u89e3\u51b3\u6b7b\u9501\u6216\u8005\u907f\u514d\u6b7b\u9501\u5c31\u4f1a\u5f88\u5bb9\u6613\uff01<\/p>\n<\/div>\n<\/div>\n<\/article>\n","protected":false},"excerpt":{"rendered":"

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