Restarting a patch after completing pre-req

How to backup current adpatch, start another patch then restore your previous adpatch
============================================================
Using the adctrl utility, shutdown the workers.
a. adctrl
b. Select option 3 “Tell worker to shutdown/quit”

c. Backup tables
sqlplus applsys/
create table FND_INSTALL_PROCESSES_3480000
as select * from FND_INSTALL_PROCESSES;
create table AD_DEFERRED_JOBS_3480000
as select * from AD_DEFERRED_JOBS;
drop table FND_INSTALL_PROCESSES;
drop table AD_DEFERRED_JOBS;

d.From OS:
cd $APPL_TOP/admin/
mv restart restart_
mkdir restart

d.Apply the new patch.
Once patch completed.
cd $APPL_TOP/admin/
mv restart restart_
mv restart_ restart

e. recreate the tablessqlplus applsys/
create table FND_INSTALL_PROCESSES
as select * from FND_INSTALL_PROCESSES_3480000;
create table AD_DEFERRED_JOBS
as select * from AD_DEFERRED_JOBS_3480000;
create synonym AD_DEFERRED_JOBS for APPLSYS.AD_DEFERRED_JOBS;
create synonym FND_INSTALL_PROCESSES FOR APPLSYS.FND_INSTALL_PROCESSES;


Now Restart adpatch, it will resume where it stopped previously

Reference: Metalink Note: 175485.1
http://vinitkan.blogspot.ae/