"THE besic thing is seems difficult who r new!!!!!! so ........"
SPFILE or server parameter file come with oracle 9i,its a parameter file but binary format and represent of text based PFILE.
IF u need create SPFILE u must have PFILE.
SPFILE create com...
>create spfile from pfile;
Initialization parameters stored in a server parameter file are persistent, in that any changes made to the parameters while an instance is running can persist across instance shutdown and startup. This eliminates the need to manually update initialization parameters to make changes effected by ALTER SYSTEM statements persistent.