[Rapid growth of the site database]

Discovery was always enabled and does not cause growth

[Rapid growth of the site database]

Hello everyone! I apologize in advance for my English.

SCCM 2012 R2 CU3 primary site and 5 secondary.

SQL Server 2012 R2 SP1 CU9

Autogrowth By 512 MB to Unlimited

The total number of 13,000 Clients (Srv and Wks) and 17000 (Users and groups).

DB last 3 weeks increased from 90 GB to 190 GB, the rapid growth in the day to 5GB.

I reduced the storage of data in the "Site Maintenance" in order to stop the growth. Has not changed.

What could be the reason and how to find it?