Thanks.
Now how can I find out how much memory is being used, and how much is free?
I have vmstat and it says:
kthr memory page faults cpu
----- ----------- ------------------------ ------------ -----------
r b avm fre re pi po fr sr cy in sy cs us sy id wa
0 2 12394 9913 0 0 0 0 0 0 207 45 28 0 0 99 0

what does avm and fre mean? If it means available and Free, this doesn't 'tally' with 128mb on this box and the SGA of the database is 34mb, so we should have enough memory to start up the database.