First we have to convert Grafana.db file into dump.mysql
Use third party tool to convert the data from sqlite to mysql.
Like : https://www.rebasedata.com/convert-sqlite-to-mysql-online
Now, run this command to restore the backup in mysql database.
mysql -u root -p db-name < dump.file.sql (restoring the backup)
After that start the mysqld database
systemctl start mysqld
Now stop and go to grafana.ini file and replace the database details in database section.
systemctl stop grafana-server
vim /etc/grafana/grafana.ini
[database] type = mysql
host = localhost:3306
name = grafana
user = [mysql database username]
password = [mysql database password]
After this restart the grafana service
systemctl start grafana-server
Now, go to Grafana console and validate the data, everything is fine.
Also checkout This Setup:-How to migrate Grafana Server