var/lib/mysql growing 5GB per week

Hi at all,

the volume var/lib/mysql growing 5GB per week. I gave it more space two weeks ago, from 60GB to120GB. This is the graph in 4 months:

Two weeks ago the volume filled up, this caused the db logs table to be deleted. I recreated the table, but now it’s not partitioned. 

So, I have two question:

• Why the var/lib/mysql volume growing so quickly? 
• Is it a problem if the logs table is not partitioned?

I'm waiting for a response, thank you very much!!