"Init.ora" is a text file, which can be viewed using a text
editor. Alternatively, we can use DBMS_UTILITY, a PL/SQL package that
comes along with the standard database installation. The DBMS_UTILITY
contains many useful functions, including GET_PARAMETER_VALUE. The GET_PARAMETER_VALUE
procedure gets "init.ora" parameter values. The parameter name is
supplied as an input to the procedure.
DBMS_UTILITY.GET_PARAMETER_VALUE (
parnam IN VARCHAR2,
intval IN OUT BINARY_INTEGER,
strval IN OUT VARCHAR2)
RETURN BINARY_INTEGER;
Where:
|
Parnam
|
Is the PARAMETER name
|
|
Intval
|
Is the VALUE of an integer
parameter or the VALUE length of a string parameter
|
|
Strval
|
Is the VALUE of a string parameter.
|
Return value is:
|
Partyp
|
Returns Parameter type:
0 if parameter is an
integer/boolean parameter
1 if parameter is a
string/file parameter
|
Here
is a sample SQL *PLUS script that uses GET_PARAMETER_VALUE:
SET SEVEROUTPUT ON
DECLARE
parnam VARCHAR2(256);
intval BINARY_INTEGER;
strval VARCHAR2(256);
partyp BINARY_INTEGER;
BEGIN
partyp := dbms_utility.get_parameter_value
('db_files',intval, strval);
-- check for parameter type
IF partyp = 1 THEN
dbms_output.put_line('The parameter type is string');
ELSE
dbms_output.put_line(' The parameter type is integer');
END IF;
-- print value
dbms_output.put('The parameter value is: ');
IF partyp = 1 THEN
dbms_output.put_line(strval);
ELSE
dbms_output.put_line(intval);
END IF;
-- if paramter type is string Print Value length
IF partyp = 1 THEN
dbms_output.put('Length of the string is: ');
dbms_output.put_line(intval);
END IF;
END;
/
show errors;
SET SEVEROUTPUT OFF
SQL> @c:\ajay\du.sql
The parameter type is: integer
The parameter value is: 1024
PL/SQL procedure successfully completed.
No errors.
SQL>
Change
the parameter type in the above example to 'db_name' and the output will
be as shown below;
SQL> @c:\ajay\du.sql
The parameter type is: string
The parameter value is: mydb
Length of the string is: 4
PL/SQL procedure successfully completed.
No errors.
Summary
You can use the DBMS_UTILITY package to
get values of parameters or use the Oracle provided dynamic view V$PARAMETER
to get parameter values. The TYPE column of the view contains the values
1,2 and 3 for BOOLEAN, STRING and INTEGER values respectively.
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