Daily DAX : Day 449 INFO.DEPENDENCIES

 Power BI DAX Function INFO.DEPENDENCIES

In the world of Power BI and DAX development, keeping track of how different objects—like measures, columns, and tables—interact can become a massive headache as a model grows.

The INFO.DEPENDENCIES() function is part of a suite of DAX Metadata Functions (often called DAX Info functions) that allows you to programmatically see the lineage and relationships within your data model.

What is INFO.DEPENDENCIES?

The INFO.DEPENDENCIES() function returns a table that describes the dependencies between different objects in your Power BI model. Essentially, it tells you, "If I change Object A, what else might break?" or "What does Object B need in order to calculate?"

It scans your model and outputs a detailed list showing:

    • Referencing Objects: The measure or column that uses another item.

    • Referenced Objects: The table, column, or measure that is being used.

The Output Structure

When you run this function, you get a table with several columns. The most important ones are:

Column Name

Description

REFERENCING_NAME

The name of the object (e.g., a measure) that contains the logic.

REFERENCING_TYPE

Whether the source is a calculated column, measure, or relationship.

REFERENCED_TABLE

The table where the dependency originates.

REFERENCED_OBJECT

The specific column or measure being called.

Use Cases: Why would you use this?

This function isn't typically used inside a standard report visual. Instead, it is a developer tool used for model maintenance and auditing.

1. Impact Analysis

Before you delete a column or refactor a complex measure, you can run INFO.DEPENDENCIES() to see exactly which other measures or calculated columns will break if that object is removed.

2. Documentation and Governance

You can use this function to automatically generate a "Data Lineage" report. By loading the results of this function into a Power BI table, you can create a visual map of how data flows from your base tables into your final KPIs.

3. Debugging Circular Dependencies

If you encounter a "Circular Dependency" error, finding the loop manually is difficult. This function allows you to see the chain of references clearly, helping you identify where the logic loops back on itself.

How to use it

You cannot use this function in a standard "Measure." Because it returns an entire table, you must use it in a Calculated Table or via a DAX Query (using DAX Query View or external tools like DAX Studio).

The Syntax:

Code snippet

EVALUATE

INFO.DEPENDENCIES()

Filtering for specific measures:

If you only want to see what a specific measure depends on, you can wrap it in a FILTER statement:

Code snippet

EVALUATE

FILTER(

    INFO.DEPENDENCIES(),

    [REFERENCING_NAME] = "Total Sales YOY"

)

Important Context

INFO.DEPENDENCIES() is a "wrapper" around the DISCOVER_CALC_DEPENDENCY DMV (Dynamic Management View). Historically, developers had to use external tools like DAX Studio to see this data. By using the INFO version, Power BI developers can now access this metadata directly inside the Power BI Desktop interface using the DAX Query View.