ORA-19905: log_archive_format must contain %s, %t and %r

During a go-live when an 11.5.10.2 database upgraded from 9.2.0.7 to 10.2.0.3, as soon as the DBA's turned compatible=10.2.0, the database would not start up. It gave the following error:

ORA-32004: obsolete and/or deprecated parameter(s) specified
ORA-19905: log_archive_format must contain %s, %t and %r

A solution is given in metalink note 283507.1:

Cause

Could not startup the database in mount / nomount stage using Spfile as Spfile had wrong format
for archive log.

Fix

To implement the solution, please execute the following steps:

1. Create a copy of the init.ora file. ( oracle_home/admin/pfile --> init.ora )
2. Edit the above init.ora to reflect the log_archive_format = 'arch_%r_%t_%s.arc'
and log_archive_dest_1 = f:\archive
3. Shutdown immediate and Startup nomount with the above pfile.
SQL> shutdown immediate
SQL> startup nomount pfile = oracle_home/admin/pfile/init.ora

4. Create spfile from pfile
SQL> create spfile = 'oracle_home/database/spfile.ora' from pfile =
'oracle_home/admin/pfile/init.ora'

5. SQL> shutdown immediate
6. SQL> startup
7. SQL> archive log list --- verify that db is in arhivelog mode.

Requirement of this format is documented in:
Administrator's Guide
10g Release 1 (10.1)
Part No. B10739-01
Chapter7 :Managing Archived Redo Logs
---> Specifying Archive Destinations .
For details please refer the above manual.