does this help
http://seer.support.veritas.com/docs/271414.htm
and then there is this
Setting the Debug Level
You can control the amount of information written to the debug log in the
install_path/netbackup/logs/dbclient directory by changing the Database debug
level. The higher the value, the more information is logged. In everyday normal
operations, the default value of 0 is sufficient. However, VERITAS technical support may
ask you to set the value higher when a problem is being analyzed. 5 is the highest possible
setting.
❖
To change the Debug Level, enter the following line in the bp.conf file.
VERBOSE = 5
I cut and pasted that out of the Veritas sysadmin 4.5 for oracle serverFreeagent guide page 124
http://72.14.209.104/search?q=cache:k6M0znYhap8J:backups.lbl.gov/backups/documentation/SysAdmin/4.5/NetBackup_AdminGuide_ServerFree_Oracle.pdf+change+dbclient+log+retention&hl=en&gl=us&ct=clnk&cd=11