Add Swap in LINUX

Create 8GB file to add swap

bash #  dd if=/dev/zero of=/u01/appl/swap1 bs=1G count=8

bash#  mkswap /u01/appl/swap1

bash#  swapon /u01/appl/swap1

bash # vi /etc/fstab

/u01/appl/swap1           swap                    swap    defaults        0 0