#### 监控死锁 **1. 使用innotop工具** - **启用innodb_status_file** 在`/etc/my.cnf`文件中添加以下配置以启用InnoDB状态文件,这有助于诊断死锁问题: ```ini [mysqld] innodb_status_file = 1 ``` 然后可以在`/var/lib/mysql/`目录下查看`.err`日志文件获取详细信息。 - **启用innodb_monitor** 创建一个监视表来跟踪InnoDB的活动情况: ```sql USE mysql; CREATE TABLE innodb_monitor (id INT) ENGINE = InnoDB; SHOW INNODB STATUS\G; ``` 例如,对于一个名为`test`的表,其结构包括主键`id`、状态字段`state`和时间字段`time`,并有一个复合索引`index(state, time)`。 - **任务1** ```sql UPDATE test SET state=1064, time=NOW() WHERE state=1061 AND time ``` 锁定顺序为先非主键索引`index`,后主键索引`id`。 - **任务2** ```sql UPDATE test SET state=1067, time=NOW() WHERE id IN (9921180); ``` 锁定顺序为先主键索引`id`,后非主键索引`index`。 - **解决方法** 为了防止死锁,应确保所有事务按照相同的顺序访问资源。例如,可以通过先选择ID再更新的方式来统一锁的顺序: ```sql SELECT id FROM tab_test WHERE state=1061 AND time UPDATE tab_test SET state=1064, time=NOW() WHERE id IN (...); ```
This pull request introduces the ability to provide comprehensive paragraph configurations directly within the Create Note and Create Paragraph REST endpoints, reducing the need for additional configuration calls. ...
[详细]