A parameter is a value that you set that is used globally in the database. Parameters are typically defined through the init.ora file, which is read at database startup. Many parameters can be modified by the "ALTER SYSTEM" or "ALTER SESSION" commands. You can query the v$parameter view to determine the parameters that were modified by the init.ora. You can also tell if the parameter is modifiable by alter system or alter session by looking at the ISSYS_MODIFIABLE and ISSES_MODIFIABLE columns of the v$parameter view.
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