What is dbrm oracle background process?

Hello,

I recently discovered a oracle background process called dbrm. I googled it, and cannot find any information about it. I'm interested in its trace file, because it writes numbers for histogram, and it appears numbers is relate to CPU. For example,

s: cpu%	cputm	cpuwt	avgrun	avgwt	actps
s:   0	269	0	0.00	0.00	0
r:	< 5	< 10	< 50  < 100  < 200 < 1000   > 1K
r:	0	0	0	0	0	0	0

Does anybody know what that background process is? What does it mean in its trace file?

Thank you!

- Xinhuan