java settings in aix/db2

hi can any one tell me following hinhs in ibm aix/db2 machine

1. how to set environment variables in aix machine ( like we set in windows machine)

2. how to increase swap (page memory ) in aix machine?

3. any extra points which i should take care of before i install on aix machine ( i have a well experience of installation on windows machines)

thanks in advance

akhil