SQL*Plus: Release 12.2.0.1.0 Production on Sun Feb 11 18:57:55 2018

Copyright (c) 1982, 2016, Oracle.  All rights reserved.

Connected to an idle instance.

SQL> host find /dev/shm/ -user oracle -printf '%10s %f\n' | awk '{s+=$1}END{print s;}'
0

SQL> startup nomount
ORACLE instance started.

Total System Global Area 2550136832 bytes
Fixed Size		    8792344 bytes
Variable Size		 1509951208 bytes
Database Buffers	 1006632960 bytes
Redo Buffers		   24760320 bytes
SQL> host find /dev/shm/ -user oracle -printf '%10s %f\n' | awk '{s+=$1}END{print s;}'
1577058304

SQL> select name, value from v$parameter where regexp_like(name, 'size|target') and isdefault='FALSE';

NAME			       VALUE
------------------------------ ------------------------------
_ksmg_granule_size	       33554432
memory_target		       2550136832
db_block_size		       8192
db_recovery_file_dest_size     17179869184

SQL> select component, current_size from v$memory_dynamic_components;

COMPONENT							 CURRENT_SIZE
---------------------------------------------------------------- ------------
shared pool							    335544320
large pool							    134217728
java pool							     33554432
streams pool								    0
SGA Target							   1543503872
DEFAULT buffer cache						   1006632960
KEEP buffer cache							    0
RECYCLE buffer cache							    0
DEFAULT 2K buffer cache 						    0
DEFAULT 4K buffer cache 						    0
DEFAULT 8K buffer cache 						    0
DEFAULT 16K buffer cache						    0
DEFAULT 32K buffer cache						    0
Shared IO Pool								    0
Data Transfer Cache							    0
In-Memory Area								    0
In Memory RW Extension Area						    0
In Memory RO Extension Area						    0
PGA Target							   1006632960
ASM Buffer Cache							    0

20 rows selected.