Parameter Changes (Oracle)
You can use this procedure to display parameter changes.
Alternatively, call transaction ST04.
This section lets you display the current and historical settings of the init<SID>.ora parameters, as well as the date they were changed. If you compare the changes in the database history with the parameter changes performed, you can work out the effect of the parameter change.
Changes to parameters do not take effect until the database instance is restarted. For more information, see the Oracle documentation.
See also:
Important init.ora Parameters (Oracle)