Thanks @Timothy_Hall after restarting cpview services I got cpview history for the time since restart (not before). Before restarting cpview services I also noticed that my cpview database history file is quite old, and that after restart it got refreshed. Also, I have checked df -h and its fine. Here is my complete command log:
[Expert@CP1:0]# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_splat-lv_current 32G 9.3G 23G 30% /
/dev/sda1 291M 60M 217M 22% /boot
tmpfs 3.8G 6.2M 3.8G 1% /dev/shm
/dev/mapper/vg_splat-lv_log 60G 6.7G 54G 12% /var/log
[Expert@CP1:0]# ls -lah /opt/CPshrd-R80.40/log/cpview_services/
total 1.5G
drwx------ 2 admin root 99 Jun 1 16:24 .
drwxrwx--- 4 admin root 4.0K Oct 14 2020 ..
-rw-r----- 1 admin root 480M Sep 21 2020 CPViewDB_1600676357.dat
-rw-r----- 1 admin root 985M Dec 23 21:32 cpview_services.dat
-rw-r----- 1 admin root 149K Jun 1 16:24 cpview_services.dat-journal
[Expert@CP1:0]# cpview -s off
[Expert@CP1:0]# cpview -s on
[Expert@CP1:0]# cpview -s stat
CPView services running
[Expert@CP1:0]# ls -lah /opt/CPshrd-R80.40/log/cpview_services/
total 1.5G
drwx------ 2 admin root 99 Jun 1 16:27 .
drwxrwx--- 4 admin root 4.0K Jun 1 16:27 ..
-rw-r----- 1 admin root 480M Sep 21 2020 CPViewDB_1600676357.dat
-rw-r----- 1 admin root 985M Jun 1 16:27 cpview_services.dat
-rw-r----- 1 admin root 251K Jun 1 16:27 cpview_services.dat-journal
[Expert@CP1:0]#