关于定义计算成员时NON_EMPTY_BEHAVIOR的含义与用途确认问询

Great question—your core understanding is spot-on, but let’s dive deeper into the nuances and practical uses of NON_EMPTY_BEHAVIOR in icCube to give you a fuller picture.

Core Functionality (Your Initial Take is Correct) #

At its heart, NON_EMPTY_BEHAVIOR does exactly what you described: it tells icCube to skip executing the calculated member’s logic entirely if all the specified base measures are empty (null, or zero depending on your cube settings) for a given cell. Instead of running the formula, icCube directly returns an empty value for that cell.

The Bigger Picture: It’s All About Optimization #

While returning null is the visible outcome, the real value of NON_EMPTY_BEHAVIOR is performance optimization. Calculated members often involve complex MDX logic—think nested aggregations, filters, subqueries, or arithmetic operations across multiple measures. For cells where the input measures are empty, running that logic is a waste of computational resources. This setting lets icCube short-circuit that work, which can drastically speed up query times, especially for large cubes or complex reports.

Key Nuances to Keep in Mind #

• Multiple measures can be specified: If any of the listed measures are non-empty, icCube will execute the calculation. Only when all specified measures are empty does it skip the logic.
• Empty isn’t just null: Depending on your cube’s configuration, "empty" might also include zero values. Double-check your cube’s empty value handling settings to be precise.
• Works with NON EMPTY clauses: When your queries use NON EMPTY to filter out empty cells, NON_EMPTY_BEHAVIOR helps icCube identify which cells to exclude early in the query pipeline, reducing the amount of data it needs to process overall.

Practical Example #

Let’s say you have a calculated member for profit margin:

CREATE MEMBER CURRENTCUBE.[Measures].[Profit Margin]
AS ([Measures].[Revenue] - [Measures].[Cost]) / [Measures].[Revenue],
NON_EMPTY_BEHAVIOR = { [Measures].[Revenue], [Measures].[Cost] };

Here, if both Revenue and Cost are empty, there’s no meaningful margin to calculate. The NON_EMPTY_BEHAVIOR setting tells icCube to skip the division entirely, avoiding unnecessary computation (and potential division-by-zero errors if Revenue were zero but not marked as empty).

Common Pitfalls to Avoid #

• Don’t specify unrelated measures: Stick to measures that are direct inputs to your calculated member’s formula. If you list measures that don’t affect the result, you might accidentally skip valid calculations.
• Don’t overlook it for simple calculations: Even for trivial expressions like [Measures].[A] + [Measures].[B], setting NON_EMPTY_BEHAVIOR = { [Measures].[A], [Measures].[B] } is a good practice—it’s low effort and can add up to meaningful performance gains over time.

To sum up: Your initial understanding is correct, but remember that NON_EMPTY_BEHAVIOR is as much about optimizing query performance as it is about returning null values for logically empty cells.

内容的提问来源于stack exchange，提问作者vldmrrdjcc