對檢視V$PARAMETER欄位的說明
NUM
NUMBER
NAME
VARCHAR2(80)
TYPE
NUMBER
-
1
- Boolean -
2
- String -
3
- Integer -
4
- Parameter file -
5
- Reserved -
6
- Big integer
VALUE
VARCHAR2(4000)
DISPLAY_VALUE
VARCHAR2(4000)
VALUE
column shows the value262144
for a big integer parameter, then theDISPLAY_VALUE
column will show the value256K
.ISDEFAULT
VARCHAR2(9)
TRUE
) or the parameter value was specified in the parameter file (FALSE
ISSES_MODIFIABLE
VARCHAR2(5)
ALTER SESSION
(TRUE
) or not (FALSE
)ISSYS_MODIFIABLE
VARCHAR2(9)
ALTER SYSTEM
and when the change takes effect:
-
IMMEDIATE
- Parameter can be changed withALTER SYSTEM
regardless of the type of parameter file used to start the instance. The change takes effect immediately. -
DEFERRED
- Parameter can be changed withALTER SYSTEM
regardless of the type of parameter file used to start the instance. The change takes effect in subsequent sessions.(即不會對當前的會話產生影響,而對之後產生的會話有影響) -
FALSE
- Parameter cannot be changed withALTER SYSTEM
unless a server parameter file was used to start the instance. The change takes effect in subsequent instances.
ISINSTANCE_MODIFIABLE
VARCHAR2(5)
ALTER SYSTEm
, indicates whether the value of the parameter(不是指ISINSTANCE_MODIFIABLE
這個檢視V$PARAMETER裡的欄位啊,而是就是指引數檔案裡的那些初始化引數,如db_name等) can
be different for every instance (TRUE
) or whether the parameter must have the same value for all Real Application Clusters instances (FALSE
). If theISSYS_MODIFIABLE
column isFALSE
, then this column is alwaysFALSE
.ISMODIFIED
VARCHAR2(10)
-
MODIFIED
- Parameter has been modified withALTER SESSION
-
SYSTEM_MOD
- Parameter has been modified withALTER SYSTEM
(which causes all the currently logged in sessions' values to be modified) -
FALSE
- Parameter has not been modified after instance startup
註釋:ISMODIFIED
為FALSE
,說明該引數為非動態引數,不能動態修改(即例項執行期間修改該引數值)。不是說該引數不能靜態修改。任何引數都是可以靜態修改的,即alter
SYSTEM
\SESSION
set 引數=引數值 scope=spfile;
ISADJUSTED
VARCHAR2(5)
ISDEPRECATED
VARCHAR2(5)
TRUE
) or not (FALSE
)ISBASIC
VARCHAR2(5)
TRUE
) or not (FALSE
)DESCRIPTION
VARCHAR2(255)
UPDATE_COMMENT
VARCHAR2(255)
HASH
NUMBER
Hash value for the parameter name