Check the size of different pools in database using SQL command and database parameter file.

set linesize 500
set pages 200
col name for a35
col value for a35

select name, value from v$parameter2 where name in ('sga_target','java_pool_size','large_pool_size','shadow_core_dump','db_cache_size','sga_max_size','sga_target','shared_pool_reserved_size','shared_pool_size');

Checking at OS Level.

egrep -i 'shared_pool_size|shared_pool_reserved_size|db_cache_size|sga_max_size|sga_target' initTEST.ora

*.db_cache_size=2G
*.sga_max_size=0
*.sga_target=0
*.shared_pool_reserved_size=320M
*.shared_pool_size=3500M
*pga_aggregate