Dax Function: INFO.ANNOTATIONS
Category: INFO Functions
The INFO.ANNOTATIONS function in Power BI is a DAX function used to retrieve metadata annotations associated with objects in the data model, such as tables, columns, or measures. These annotations typically store custom information or properties added during data modeling.
Purpose
The function is primarily designed for:
Accessing and analyzing metadata annotations.
Providing insights into custom properties or configurations that are embedded within the model.
Facilitating dynamic reporting or auditing by revealing hidden or implicit information.
Type of Calculations It Performs
The INFO.ANNOTATIONS function does not perform calculations in the traditional sense. Instead, it retrieves metadata entries for objects, which may include:
Custom tags or descriptions.
Configuration properties added during ETL (Extract, Transform, Load) processes.
Data lineage or documentation annotations.
Practical Use Cases
Model Auditing: Analyze and validate annotations to ensure correct configurations.
Dynamic Reporting: Use annotations to adjust report elements dynamically.
Documentation: Generate automated schema reports, including annotations.
Debugging and Optimization: Identify and troubleshoot metadata-related issues.
INFO.ANNOTATIONS(<object>)</object>
| Parameter | Type | Description |
|---|---|---|
<object> | Scalar, Table | Specifies the model object (table, column, or measure) to retrieve annotations for. |
How Does INFO.ANNOTATIONS Dax Works
Annotation Query: The function queries the model’s metadata for a specific object.
Result Compilation: It compiles a table containing the annotation names and their corresponding values.
What Does It Return?
The function returns a table containing:
Annotation Name: The name of the annotation.
Annotation Value: The associated value or data of the annotation.
Object Reference: The object to which the annotation belongs.
For example:
| Annotation Name | Annotation Value | Object Reference |
|---|---|---|
| Description | “Sales Data Table” | Sales |
| Data Lineage | “ETL Process” | Orders |
When Should We Use It?
When you need to access or validate metadata annotations embedded in the model.
To dynamically drive visual elements or logic based on annotation properties.
During the development and auditing phases to understand custom configurations or tags.
Examples
Basic Usage :
Retrieve annotations for a table named Sales:
INFO.ANNOTATIONS(Sales)
Output:
| Annotation Name | Annotation Value |
|---|---|
| Description | “Sales Data Table” |
| Custom Property | “Active” |
Column Usage
Retrieve annotations for a specific column:
INFO.ANNOTATIONS(Sales[Amount])
Output:
| Annotation Name | Annotation Value |
|---|---|
| Format String | “$#,##0.00” |
| Custom Property | “Critical Measure” |
Advanced Usage
Combine with filtering to identify critical annotations:
FILTER(INFO.ANNOTATIONS(Sales), [Annotation Name] = "Critical Measure")
Tips and Tricks
Combine with Filters: Use DAX filtering functions to isolate annotations of interest.
Audit Models Regularly: Use this function as part of your quality assurance process.
Leverage for Automation: Automate schema generation or data lineage reports using annotations.
Potential Pitfalls
Performance: Retrieving annotations for large models or many objects can be resource-intensive.
Annotation Availability: Not all objects may have annotations. Ensure proper configuration during model development.
Performance Impact of INFO.ANNOTATIONS DAX Function:
Efficient for small-scale use.
Consider pre-aggregating or exporting results for large datasets to avoid performance bottlenecks.
Related Functions You Might Need
INFO.VIEW.TABLES: Retrieves table metadata.
INFO.VIEW.COLUMNS: Retrieves column metadata.
INFO.VIEW.RELATIONSHIPS: Provides details about model relationships.
Want to Learn More?
For more information, check out the official Microsoft documentation for INFO.ANNOTATIONS You can also experiment with this function in your Power BI reports to explore its capabilities.
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It retrieves metadata annotations for objects in the Power BI data model.
It can return properties such as descriptions, custom tags, and data lineage information.
Yes, the function can retrieve annotations for measures, columns, and tables.
It can be for large models. Use filters to optimize performance.
Use it for auditing, documentation, dynamic reporting, and debugging metadata configurations.