OPS - Very large DB

Hi to All,
I wanted to ask You a question.
In our backup infrastructure, we Installed on a Windows server 2008r2 the OPS center 7.6.0.1 (NBU 7.5.0.6 on Solaris 10).
The ops db grew to approximately 100GB:
symcOpscache.db 59756536 KB
symcopsscratchdb.db 168 KB
symcsearchdb.db 1192 KB
vxpmdb.db 43034392 KB

I wanted to know if there is a way to shrink the DB without compromising the usability of the product.

Sorry for my english
Thank you

Regards

Valerio