Install DB2 9 under AIX6

First, check the machine environment and check whether there are any residual database installation directories and related users. If they are found, they will be deleted.
Check whether the/opt/IBM directory contains db2 files.
Next, let's look at the user directories under/home. The corresponding users are still not there. If they are not there, simply delete the directories, delete the users, and then delete the directories. The userdel command
# Mkgroup id = 999 db2iadm1
# Mkgroup id = 998 db2fadm1
# Mkgroup id = 997 dasadm1
#
# Mkuser id = 1004 pgrp = db2iadm1 groups = db2iadm1 home =/home/db2inst1 core =-1 data = 491519 stack = 32767 rss =-1 fsize =-1 db2inst1
# Mkuser id = 1003 pgrp = db2fadm1 groups = db2fadm1 home =/home/db2fenc1 db2fenc1
# Mkuser id = 1002 pgrp = dasadm1 groups = dasadm1 home =/home/dasusr1 dasusr1

Configure the passwords separately.

After the installation starts, there is a wizard to complete the installation process.