R12.1.x - adapcctl.sh: exiting with status 204/ HTTP_Server~1.log : libdb.so.2: cannot open shared object file

I cloned R12.1.2 environment from Production to a Linux 64 bit test system. The clone process completed successfully, When I was trying to start all the services using 'adstrtal.sh' . The HTTP/Apache process did not start up. I was receiving the following error :

You are running adapcctl.sh version 120.7.12010000.2

Starting OPMN managed Oracle HTTP Server (OHS) instance ...

adapcctl.sh: exiting with status 204

Research:

Verify the logs. I checked adapcctl.txt 
ias-component/process-type/process-set:
    HTTP_Server/HTTP_Server/HTTP_Server/

Error
--> Process (index=1,uid=1288926491,pid=31768)
    failed to start a managed process after the maximum retry limit
and it referred to HTTP_Server~1.log.

HTTP_Server~1.log showed the actual issue:
/tech_st/10.1.3/Apache/Apache/bin/httpd: error while loading shared libraries: libdb.so.2: cannot open shared object file: No such file or directory

Solution:

Shutdown the Oracle Application services and as a  unix root user, create a soft link as follows:

$ ll /usr/lib/libgdbm.so.2.0.0
-rwxr-xr-x 1 root root 24800 Jul 23  2010 /usr/lib/libgdbm.so.2.0.0
ll /usr/lib/libdb.so.2
ls: cannot access /usr/lib/libdb.so.2: No such file or directory
$ ln -s /usr/lib/libgdbm.so.2.0.0 /usr/lib/libdb.so.2
$ ll /usr/lib/libdb.so.2
lrwxrwxrwx 1 root root 25 Oct 31 13:07 /usr/lib/libdb.so.2 -> /usr/lib/libgdbm.so.2.0.0

Reference:
Attempting to Start Apache (adapcctl.sh) Throws an 'Error While Loading Shared Libraries: libdb.so.2' on RedHat Linux 5 (Doc ID 879522.1)