V$SYSTEM_PARAMETER

Oracle 11gR1

V$SYSTEM_PARAMETER displays information about the initialization parameters that are currently in effect for the instance. A new session inherits parameter values from the instance-wide values.

Column	Datatype	Description
NUM	NUMBER	Parameter number
NAME	VARCHAR2(80)	Name of the parameter
TYPE	NUMBER	Parameter type: · 1 - Boolean · 2 - String · 3 - Integer · 4 - Parameter file · 5 - Reserved · 6 - Big integer
VALUE	VARCHAR2(4000)	Instance-wide parameter value
DISPLAY_VALUE	VARCHAR2(4000)	Parameter value in a user-friendly format. For example, if the VALUE column shows the value 262144 for a big integer parameter, then the DISPLAY_VALUE column will show the value 256K.
ISDEFAULT	VARCHAR2(9)	Indicates whether the parameter is set to the default value (TRUE) or the parameter value was specified in the parameter file (FALSE)
ISSES_MODIFIABLE	VARCHAR2(5)	Indicates whether the parameter can be changed with ALTER SESSION (TRUE) or not (FALSE)
ISSYS_MODIFIABLE	VARCHAR2(9)	Indicates whether the parameter can be changed with ALTER SYSTEM and when the change takes effect: · IMMEDIATE - Parameter can be changed with ALTER SYSTEM regardless of the type of parameter file used to start the instance. The change takes effect immediately. · DEFERRED - Parameter can be changed with ALTER SYSTEM regardless of the type of parameter file used to start the instance. The change takes effect in subsequent sessions. · FALSE - Parameter cannot be changed with ALTER SYSTEM unless a server parameter file was used to start the instance. The change takes effect in subsequent instances.
ISINSTANCE_MODIFIABLE	VARCHAR2(5)	For parameters that can be changed with ALTER SYSTEm, indicates whether the value of the parameter can be different for every instance (TRUE) or whether the parameter must have the same value for all Real Application Clusters instances (FALSE). If the ISSYS_MODIFIABLE column is FALSE, then this column is always FALSE.
ISMODIFIED	VARCHAR2(8)	Indicates how the parameter was modified. If an ALTER SYSTEM was performed, the value will be MODIFIED.
ISADJUSTED	VARCHAR2(5)	Indicates whether Oracle adjusted the input value to a more suitable value (for example, the parameter value should be prime, but the user input a non-prime number, so Oracle adjusted the value to the next prime number)
ISDEPRECATED	VARCHAR2(5)	Indicates whether the parameter has been deprecated (TRUE) or not (FALSE)
ISBASIC	VARCHAR2(5)	Indicates whether the parameter is a basic parameter (TRUE) or not (FALSE)
DESCRIPTION	VARCHAR2(255)	Description of the parameter
UPDATE_COMMENT	VARCHAR2(255)	Comments associated with the most recent update
HASH	NUMBER	Hash value for the parameter name

Note:

You can view parameter settings in several ways, as shown in the following table.

Method	Description
SHOW PARAMETERS	This SQL*Plus command displays the values of initialization parameters in effect for the current session.
SHOW SPPARAMETERS	This SQL*Plus command displays the values of initialization parameters in the server parameter file (SPFILE).
CREATE PFILE	This SQL statement creates a text initialization parameter file (PFILE) from the SPFILE or from the current in-memory settings. You can then view the PFILE with any text editor.
V$PARAMETER	This view displays the values of initialization parameters in effect for the current session.
V$PARAMETER2	This view displays the values of initialization parameters in effect for the current session. It is easier to distinguish list parameter values in this view because each list parameter value appears in a separate row.
V$SYSTEM_PARAMETER	This view displays the values of initialization parameters in effect for the instance. A new session inherits parameter values from the instance-wide values.
V$SYSTEM_PARAMETER2	This view displays the values of initialization parameters in effect for the instance. A new session inherits parameter values from the instance-wide values. It is easier to distinguish list parameter values in this view because each list parameter value appears in a separate row.
V$SPPARAMETER	This view displays the current contents of the SPFILE. The view returns FALSE values in the ISSPECIFIED column if an SPFILE is not being used by the instance.

Oracle dynamic performance views