Database startup failure

## Reason 1: Port 3306 is Occupied
If the MySQL service fails to start, it may be because port 3306 is occupied by another process. You can use the following commands to check for port occupation:

On Linux systems:

```bash
sudo lsof -i :3306
# Or use the netstat command (requires installation of net-tools)
sudo netstat -tulnp | grep :3306

```
On Windows systems: Open Command Prompt (cmd) and run the following command:

```bash
netstat -ano | findstr :3306

```
After executing the command, you will see output similar to the following:

```bash
tcp        0      0 0.0.0.0:3306       0.0.0.0:*        LISTEN      1234

```
Killing the Process Occupying the Port
If you find that port 3306 is occupied by another process, you can terminate that process.
On Linux systems:

```
sudo kill -9 <Process ID>

```
On Windows systems: Run the following command in Command Prompt:

```
taskkill /PID <Process ID> /F

```
## Reason 2: Changed LarkXR Installation Directory
If LarkXR was previously installed on the server and registered as a system service, changing the deployment directory will result in an incorrect path recorded in the service. In this case, you need to follow these steps:
**Delete the PxyMysql8 Service:**
Open cmd as an administrator and run:

```bash
sc delete PxyMysql8

```
**Restart the Server:**
Restart the server to ensure all configuration updates take effect.

**Restart the Database Service:**
After the server restarts, manually start the database service to ensure it is running properly.