Where are parameter files stored and how can you start a database using a specific parameter file?

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In UNIX they are stored in the location $ORACLE_HOME/dbs and ORACLE_HOME/database for Windows directory.

Oracle by default starts with SPFILE located in $ORACLE_HOME/dbs.

If you want to start the database with particular file, we can append it at the startup command as
SQL > startup PFILE = ‘full path of parameter file ‘;

You can create PFILE from SPFILE'
SQL>create PFILE from SPFILE;
update parameter in PFILE then run the following command
SQL>Create SFILE from PFILE;

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