You can delete it, it doesn't create any problem......
By default magento generates 2 files called System.log & Exception.log files reside in var/log folder to track the errors.....
also you can Disable generating new log files using below configuration :
If log files are generating means, it shows the errors/warnings, so that something wrong in the site, instead of deleting you should check the errors and try to solve it when you get free time....
No. The sessions are what keeps your customers logged in. But deleting all the sessions can't be the solution to whatever problem you face. Either it's enough to delete cookies to loose your own session or there's really something broken with the sessions, then you are just fighting symptoms and creating new problems.
A warning for everybody who is tempted to delete var/session!
This will log out all your customers and delete the carts of guest customers. If you have visitors that might want to buy something, this is really bad for your business!
If your disk is full and your goal is to make some space, you can use this command to only remove session files older than 7 days:
find var/session -name 'sess_*' -type f -mtime +7 -delete
Best Answer
You can delete it, it doesn't create any problem...... By default magento generates 2 files called System.log & Exception.log files reside in
var/logfolder to track the errors.....also you can Disable generating new log files using below configuration :
System > Configuration > Developer > Log settings > Disable Logging
If log files are generating means, it shows the errors/warnings, so that something wrong in the site, instead of deleting you should check the errors and try to solve it when you get free time....