How can you start the database using PFILE or SPFILE? | Oracle DBA

Oracle scans for SPFILE or PFILE in the ORACLE_HOME/dbs (UNIX) or ORACLE_HOME/database (Windows) directory.
First, it looks for SPFILE and then for PFILE in the directories.
Oracle searches in the following order:
1. spfile.ora
2. spfile.ora
3. init.ora
4. init.ora
If you want to use a specific PFILE or SPFILE, you can specify the complete path and file name at the startup of the Oracle database using the following command: SQL>startup pfile='path/filename'