Ora-01940 how to kill session

 select s.sid, s.serial#, s.status, p.spid
 from v$session s, v$process p
 where upper(s.username) = upper('USERNAME')
 and p.addr (+) = s.paddr;

 alter system kill session '<s.sid>,<s.serial#>';

Linux add a swap file howto

Procedure to add a swap file
1.

su - root

2.

dd if=/dev/zero of=/swapfile1 bs=1M count=1000

3.

mkswap /swapfile1

4.

swapon /swapfile1

5.

vi /etc/fstab
/swapfile1 swap swap defaults 0 0

6.

free -m