我的操作系统为oralcelinux8,昨晚在实验rapid引擎的增量导入数据时,报下面的错。 SELECT START_SECONDARY_ENGINE_INCREMENT_LOAD_TASK('test', 't1'); ERROR 2013 (HY000): Lost connection to MySQL server during query No connection. Trying
方式一:继承Thread类并重写run()方法。 public class CreatingThread01 extends Thread { @Override public void run() { System.out.println(getName() + " is running"); } public static void main(String[] args) { new Crea
如何测试MySQL已经开启?下面是一些简单的方法来测试MySQL是否正在运行。 #使用命令行检查MySQL是否启动 $ sudo service mysql status #运行这个命令以确保MySQL正在运行 mysql start/post-start, process 1345 mysql start/post-start, process 1351 mysql start/post-sta
报错信息 [GAUSS-53600]: Can not start the database, the cmd is source /home/omm/.bashrc; python3 '/opt/software/om/script/local/StartInstance.py' -U omm -R /opt/software/install/app -t 300 --security-mode
现象 最近收到一个慢sql工单,慢sql大概是这样:“select xxx from tabel where type = 1”。 咦,type字段明明有索引啊,为啥是慢sql呢? 原因 通过执行explain,发现实际上数据库执行了全表扫描,从而被系统判定为慢sql。这时有一定开发经验的同事会说:“字段区分度不够,这种字段作单独索引是没有意义的”。那么为什么会产生索引失效这种情况呢?索引失效都有
Introduction KeymouseGo is a open source software based on python, which can imitate the operation on mouse and keyboard. This article will introduce how to install it and start up it on Ubuntu accord