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Oracle® OLAP DML Reference
11g Release 1 (11.1)

B28126-03
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CHGDIMS

The CHGDIMS function changes the dimensionality of an expression or changes the dimension status during the evaluation of expression.

Return Value

Data type of the original expression.

Syntax

CHGDIMS (expression, limit-type)

where limit-type is one of the following:

[CACHE] LIMITSAVE valueset-list

[CACHE] LIMIT valueset-list

TO dimension-list

ADD dimension-list

Arguments

expression

The expression you want to modify.

CACHE

Specifies that Oracle OLAP caches the result of the limit and saves it for use in subsequent executions of CHGDIMS until the OLAP DML statement that called CHGDIMS finishes execution.

LIMITSAVE

Specifies that Oracle OLAP sets the value of dimension status for expression to the position before the CHGDIMS command executed (that is, specifying LIMITSAVE does not change the current dimension status value). For example, you specify CHGDIMS with LIMITSAVE if expression is the LAG function so that the lag is from the current value; or if you are coding CHGDIMS inside of an outer loop, like a SQL SELECT statement, and you want to keep the dimension status value set by the outer loop.

LIMIT

Specifies the Oracle OLAP sets the value of dimension status for expression to the first position in the new status before evaulating expression in much the same way as if a LIMIT TO command was issued just before evaluating expression.

valueset-list

The name of a valueset or the LIMIT function.

TO dimension-list

Specifies that Oracle OLAP evaluate expression as though the dimensions of expression are the dimensions specified by dimension-list.

ADD dimension-list

Specifies that Oracle OLAP evaluateexpression as though the dimensions of expression are the dimensions of expression plus the dimensions specified by dimension-list

Examples

Assume that you have the following objects in your analytic workspace.

DEFINE PRODUCT DIMENSION TEXT
DEFINE GEOG DIMENSION TEXT
DEFINE SALES VARIABLE INTEGER <PRODUCT GEOG>
 

Assume, also, that the sales variable has the following values.

               -------------------SALES-------------------
               ------------------PRODUCT------------------
GEOG            Trousers    Skirts    Dresses     Shoes
-------------- ---------- ---------- ---------- ----------
USA                    13         20         32         18
Canada                 17         32         15         28
 

The following lines of code show how the value returned by a TOTAL(sales) expression varies depending on how you qualify that expression.

"Total over all dims with standard status
SHOW TOTAL(sales)
175
 
"Total over all dims using new status for product
SHOW CHGDIMS(TOTAL(sales) LIMIT(product TO FIRST 2)))
82
 
"Total just over product
SHOW TOTAL(CHGDIMS(sales TO product))
83