help me

i have a problems for deploying database POSTGRESQL ON MY OS linux

first point is :
i want to put the data of database in another location, what can i do at
installation and after installation

second point is:
when the location is full what can i do for extend the database in the nex
location

third point is
i have a file whom is containt the texte in ascii with delimiters the field
is ";" , when i use:
"COPY mytable From file delimiters ";"
this command return error
"COPY command, running in backend with effective uid 40 , could not open
file '/home/ouatt/yyy208' for reading errno=permission denied (13)"

baley(at)ivoiris(dot)ci