What happens when your SPFILE is missing while starting the DB ?

I have a database called "Test".

The Test DB has its Pfile and SPfile.

Pfile is configured with the Memory of 600MB.
SPfile is configured with the Memory of 700MB.

I have renamed my SPfile.

[oracle@node1 dbs]$ mv spfileTest.ora spfileTest.ora_ORIG
[oracle@node1 dbs]$ ls -l spfileTest.ora*
-rw-r----- 1 oracle oinstall 2560 Jun 14 20:46 spfileTest.ora_ORIG
[oracle@node1 dbs]$

Shutting down and starting the DB:

SQL> shutdown immediate;

Database closed.

Database dismounted.

ORACLE instance shut down.

SQL> startup

ORACLE instance started.

Total System Global Area  626327552 bytes

Fixed Size                  2215944 bytes

Variable Size             373297144 bytes

Database Buffers          247463936 bytes

Redo Buffers                3350528 bytes

Database mounted.

Database opened.

SQL> show parameter spfile;

NAME                                 TYPE        VALUE

------------------------------------ ----------- ------------------------------

spfile                               string

SQL>

SQL> select name from v$database;

NAME

---------

TEST

SQL> sho parameter sga_max_size;

NAME                                 TYPE        VALUE

------------------------------------ ----------- ------------------------------

sga_max_size                         big integer 600M

SQL>