Config and cache issues

Hello,
i dont get it how caching system works on OpenCart , just too many issues at least in my case. As a wordpress developer for past 6 years i pretty much know something about CMSs but OC caching i cant figure out. Simple example i edited config file to target my new databse (config.php and admin/config.php) but when i load site via browser it always show me old values. I open file in editor and i can see new values but simply installer / browser always load old values. Found that cache is stored in storage/cache so i deleted all files except index.html and same issue.

Are you using any custom plugins?

Also try clearing OCMOD
Extensions > Modifications > (click clear cache at the top right).

If you use VQMOD too make sure you delete the 2 cache files in the vqmod folder:
checked.cache
mods.cache

In addition to clearing the OC cache mentioned above, make sure your browser cache is cleared as well. One other cache would be vqmod cache if you're using vqmod.