Clearing the Media Cache Database

Hi,  In a tutorial on using Encore CS6 it says to "clear the media cache database"
Why is this done?  ...and if done... does it remove any important files, clips, assets..etc that are in my other projects?  Is it safe to do this?
Thanks 

PPro and Encore create MANY temporary files, which may be deleted when you are done with the project... your original video clips and project files are in a location of your choosing, not in the cache folders
Some more on locations http://forums.adobe.com/thread/1007934?tstart=0
And, one way to design your project http://forums.adobe.com/thread/919388?tstart=0
I always create my project files on my 2nd hard drive (see below) so the temporary files are also put on that drive
My 3 hard drives for video editing are configured as...
1 - 320Gig Boot for Win7 64bit Pro and ALL program installs (2)
2 - 320Gig data for Win7 paging swap file and video project files
When I create a project on #2 drive, the various work files follow,
so my boot drive is not used for the media cache folders and files
3 - 1Terabyte data for all video files... input & output files (1)
(1) for faster input/output if you have 4 drives
- use drive 3 for all source files
- use drive 4 for all output files
(2) only 60Gig used, for Win7 & CS5 MC & MS Office & other smaller programs
Search Microsoft to find out how to redirect your Windows paging swap file
http://search.microsoft.com/search.aspx?mkt=en-US&setlang=en-US
I do not use RAID... AVCHD is CPU intensive, not drive intensive like uncompressed, so
I have no problems editing without RAID (but, this is for "simple" home videos)

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