Continuous Integrations

I have integrated MySQL, so is it continuous integration, As soon as DB is updated does the dashboard gets updated too?

no… when a dashboard is viewed, Holistics will store the results in Cache. You can set the cache expiry to be lower - I think the minimum is 10 minutes.
So then, after 10 minutes, the next time that dashboard is opened or refreshed, the cache will be refreshed and new data brought back

There are a few ways to force a dashboard refresh without manual input - some of which are discussed here…
A workaround for the dashboard auto-refresh feature

but you will still be bound to the cache expiry time