Question : Google Earth - large cache file - dbcache.dat

I'm not sure if I'm in the right zone for this question but I recently did a defrag running XP and a large dat file dbcache.dat (824MB) could not be defragmented. The file is located in Documents and Settings\Local Settings\Application Data\Google\Google Earth. Is this dat file a cache that  I should empty periodically? If so, how do I do that?

Thanks

Answer : Google Earth - large cache file - dbcache.dat

http://earth.google.com/support/bin/answer.py?hl=en&answer=20712

This file is rebuilt the next time you log on.