You can not adjust the database size on your own. If you purchase the full SQL license (through Cisco, not Microsoft), the capacity of the database will be raised to 10240MB (from 2048MB).
Keep in mind that any manual workarounds you might have success with will be temporary and invalidate your upgrade path. This is because CCX 8.0 will be on a sealed Linux-based appliance identical to UC Manager 5.0+.
We discovered recently that our UCCX server is actually running MSDE (which has a 2GB db limit), not MSSQL as we'd thought. It sounds like that's what you've run into as well. We're looking at upgrading to the Cisco version of SQL 2000 which will let us have databases up to 10GB in size. I believe that that's as large as one can go with UCCX, at least with the Cisco version of SQL.
These are the paths to get to each CCX logs through CLI. They may be helpful if you are having issues accessing RTMT or downloading logs through it.
If you want to download them you have to prefix "file get " and you can add one of the options (re...