Copy all these parameters to create pfile (init.ora) , modify necessary path and size according to your requirement.
From pfile you can create spfile by using "create spfile from pfile='location\init.ora'; "
__db_cache_size=2816M
__java_pool_size=32M
__large_pool_size=16M
__oracle_base='/d01/app/oracle'
# ORACLE_BASE set from environment
__pga_aggregate_target=2512M
__sga_target=3744M
__shared_io_pool_size=0
__shared_pool_size=800M