When you have several databases in the same server using also the same user, it is common human errors because wrong Oracle environmental variables configuration. Then below has a script that you can put in .profile file of the user own of Oracle Database files on IBM AIX: EDITOR=vi export EDITOR clear echo “Please choose the instance number” echo ” ” cont=0 awk -F: ‘ ! /^#|^$|^*/ {print $1,$2}’ /etc/oratab | while read par1 par2 do cont=`expr $cont + 1` inst[$cont]=$par1 orahome[$cont]=$par2 echo ” [ $cont ] ${inst[$cont]} ( ${orahome[$cont]}…