It's depends on your data on /var specially your mysql, but if you want to increase that, the easiest and fastest option is to create a directory in /home and move all data or just only mysql data of /var to that directory and create soft link of /var to /home/var. The steps will be as follows.
In other hand, You most likely have a lot of temporary files somewhere on your root.
Check size of your temporary by the following command:
Code:
du -hs /tmp /var/tmp
Otherwise check the /var directories with:
Code:
du -hs /var/*
If you run your program as root it could be somewhere in /root.