Few months back my website sessions use to get recorded in var/session folder. Suddenly one day I was not able to delete that folder. I also tried using commands but It didnt work. Because of this my indoes level went high and website ended up crashion. So I have shifted my session files to DB, where I can easily truncate if required. But since few days my Website suddenly gets super slow, maybe because I am also upgrading my website to Magento 2.0 and its in the same server. But when I check my DB tables the core_session file size is increasing my 400 mb each day. I dont know where I am going wrong or the cron job settings are wrong. Please if anyone can help me on this.