Thank you JBasilio and Bob_Clarck.
My OS-type of our cell manager is Red Hat Enterprise Linux Server release 5.4
The output of omnidbutil -info is:
Media Management database space usage:
Space used by Diskspace usage Records used Records total
===============================================================
Devices 96 1 64
Libraries 96 1 64
Cartridges 64 23 40
Compounds 32 0 128
Pools 64 23 64
Media 64 20 128
Catalog database space usage:
Space used by Diskspace usage Records used Records total
===============================================================
Sessions 5312 8383 8400
Objects 192 399 496
Object versions 29024 31019 31512
Positions 10368 53317 54400
Filenames 714496 9022702 9023168
Detail catalog binary files usage:
Diskspace usage Size limit DC Directory
===============================================================
4082 16384 /var/opt/omni/server/db40/dcbf
----------------------------------------------------------------------------
4082 16384
Session messages binary files usage:
Diskspace usage Num. of files SMBFs Directory
===============================================================
27 8383 /var/opt/omni/server/db40/msg
Serverless integrations binary files usage:
Diskspace usage Num. of files SIBFs Directory
===============================================================
0 0 /var/opt/omni/server/db40/meta