Cisco Headend System Release 2.5 Installation Guide

 

4020695 Rev C 

101 

 

Be sure that you have a current backup of your DNCS database before running  the 
checkDB script with the -f or -F options. Refer to the appropriate copy of the backup 
and restore procedures for detailed instructions on how to back up the DNCS 
database. 

Note:  The checkDB script makes no database changes when run with no options or 
with the -v option. The script may change the database when run with the -f  or -F 
options. Refer to Run the checkDB Script (on page 102) for additional information 
concerning the options associated with the checkDB script. 

 

When used with the -f or -F options, the checkDB script calls the deleteDhct utility in 
order to delete DHCT records from the database. The logic of the checkDB script is 
such that all references to the deleteDhct utility occur automatically; no user 
intervention is required. The deleteDhct utility is included on the DBDS Utility CD. 

We designed the deleteDhct utility to completely delete DHCT records from the 
DNCS database. It deletes a single DHCT or can delete all DHCTs in a list containing 
DHCT MAC addresses that are presented in a text file.  

The logic in the deleteDhct utility is very good at finding all database rows in all the 
different DHCT tables that contain or used to contain records for the specified 
DHCT(s). The deleteDhct utility deletes orphaned DHCT records. While orphaned 
DHCT records are less common now than they have been in the past, at one time 
duplicate database rows were generated for RMA DHCTs when they were returned 
from repair with a changed secure_micro address.