Yes, that string dropped you into the mysql prompt. From there you can use the commands in the post I linked to.

Thanks Nick.
Unfortunately, the copy-paste drop me to '>' prompt.
Please suggest.

The directory /var/lib/system-mysql/reports has these files;

total 3617824
drwx------ 2 system-mysql system-mysql 4096 Apr 11 18:02 .
drwxr-xr-x 4 system-mysql system-mysql 4096 Apr 11 17:57 ..
-rw-rw---- 1 system-mysql system-mysql 65 Oct 26 11:47 db.opt
-rw-rw---- 1 system-mysql system-mysql 9012 Oct 26 12:03 network.frm
-rw-rw---- 1 system-mysql system-mysql 8660 Oct 26 11:47 proxy_domains.frm
-rw-rw---- 1 system-mysql system-mysql 9382 Jan 15 03:02 proxy.frm
-rw-rw---- 1 system-mysql system-mysql 2053632000 Apr 11 15:14 proxy.MYD
-rw-rw---- 1 system-mysql system-mysql 1024 Apr 11 15:14 proxy.MYI
-rw-rw---- 1 system-mysql system-mysql 1650946048 Apr 11 18:29 proxy.TMD
-rw-rw---- 1 system-mysql system-mysql 9174 Oct 26 12:03 resource.frm

This increase in size is the latest; it generated this proxy.TMD today..

The disk-space is issue now.
Please suggest solution for this.

Thanks in advance.

If you think it is in the reports section, there is some interesting sql stuff here. You can log onto your system-mysql with this great string (copy and paste):

/usr/clearos/sandbox/usr/bin/mysql -D reports -u reports -p`cut -f3 -d" " /var/clearos/system_database/reports`

See how big your tables are. I'd need to dig futher to look outside the reports area, and I'd probably do it from the mysql webconfig tool, but you need to do things to to enable it.