Unable to configure log archive destination in oracle 11g express

Question

I have oracle 11g express in machine & i want to change archive destination.

Step 1 Before Execute below script i have below screen output

SQL> archive log list;

Database log mode Archive Mode

Automatic archival Enabled

Archive destination USE_DB_RECOVERY_FILE_DEST

Oldest online log sequence 1

Next log sequence to archive 2

Current log sequence 2

Step 2 After execute script to change archive destination, i have below screen output

SQL> ALTER SYSTEM SET log_archive_dest_1='LOCATION=c:\arch\arch\';

System altered.

SQL> archive log list;

Database log mode Archive Mode

Automatic archival Enabled

Archive destination c:\arch\arch\

Oldest online log sequence 1

Next log sequence to archive 2

Current log sequence 2

Now i have again shutdown and start my database instance then why my settings has been re change as previous stage as on first screen.

Overall i'm not able to change archive destination.

Step 3 Getting back below archive destination location

SQL> shutdown immediate;

ORA-01109: database not open

Database dismounted.

ORACLE instance shut down.

SQL> startup mount;

ORACLE instance started.

Total System Global Area 1068937216 bytes

Fixed Size 2260048 bytes

Variable Size 616563632 bytes

Database Buffers 444596224 bytes

Redo Buffers 5517312 bytes

Database mounted.

SQL> archive log list;

Database log mode Archive Mode

Automatic archival Enabled

Archive destination USE_DB_RECOVERY_FILE_DEST

Oldest online log sequence 1

Next log sequence to archive 2

Current log sequence 2

Answer 1

Spfile is missing in the command,

ALTER SYSTEM SET log_archive_dest_1='LOCATION=c:\arch\arch\' scope=spfile ; and restart