PBIXRay

Overview

PBIXRay is a Python library designed to parse and analyze PBIX files, which are used with Microsoft Power BI. This library provides a straightforward way to extract valuable information from PBIX files, including tables, metadata, Power Query code, and more.

This library is the Python implementation of the logic embedded in the DuckDB extension duckdb-pbix-extension.

Note: PBIXRay also supports Excel (XLSX) files with embedded PowerPivot models. You can use the same API to extract and analyze data models from XLSX files that contain PowerPivot data.

Installation

Install with pip:

pip install pbixray

Getting Started

To start using PBIXRay, import the module and initialize it with the path to your PBIX file:

from pbixray import PBIXRay

model = PBIXRay('path/to/your/file.pbix')

Large models (on-disk loading)

By default the entire decompressed data model is held in memory. For models whose uncompressed size approaches or exceeds available RAM, pass on_disk=True: the decompressed data is streamed to a temporary file and memory-mapped, so only the pages a requested table actually touches are faulted in. Use temp_dir to control where the spill file is created (defaults to the system temp directory).

# Spill to disk + mmap instead of holding everything in RAM.
with PBIXRay('path/to/large.pbix', on_disk=True, temp_dir='/fast/scratch') as model:
    df = model.get_table('Sales')
# leaving the `with` block releases the mapping and removes the temp file

PBIXRay is also a context manager; model.close() (or exiting the with block) deterministically releases the memory map and the metadata connection. When on_disk=False (the default) behavior is unchanged. Metadata (DAX, TMSCHEMA_*, etc.) is loaded lazily on first access, so simply opening a file is cheap.

Features and Usage

Tables

To list all tables in the model:

tables = model.tables
print(tables)

Metadata

To get metadata about the Power BI configuration used during model creation:

metadata = model.metadata
print(metadata)

Power Query

To display all M/Power Query code used for data transformation, in a dataframe with TableName and Expression columns:

power_query = model.power_query
print(power_query)

M Parameters

To display all M Parameters values in a dataframe with ParameterName, Description, Expression and ModifiedTime columns:

m_parameters = model.m_parameters
print(m_parameters)

Model Size

To find out the model size in bytes:

size = model.size
print(f"Model size: {size} bytes")

DAX Calculated Tables

To view DAX calculated tables in a dataframe with TableName and Expression columns:

dax_tables = model.dax_tables
print(dax_tables)

DAX Measures

To access DAX measures in a dataframe with TableName, Name, Expression, DisplayFolder, and Description columns:

dax_measures = model.dax_measures
print(dax_measures)

Calculated Columns

To access calculated column DAX expressions in a dataframe with TableName,ColumnName and Expression columns:

dax_columns = model.dax_columns
print(dax_columns)

Schema

To get details about the data model schema and column types in a dataframe with TableName, ColumnName, and PandasDataType columns:

schema = model.schema
print(schema)

Relationships

To get the details about the data model relationships in a dataframe with FromTableName, FromColumnName, ToTableName, ToColumnName, IsActive, Cardinality, CrossFilteringBehavior, FromKeyCount, ToKeyCount and RelyOnReferentialIntegrity columns:

relationships = model.relationships
print(relationships)

Row-Level Security (RLS)

To get the details about Row-Level Security roles and permissions in a dataframe with TableName, RoleName, RoleDescription, FilterExpression, State and MetadataPermission columns:

rls = model.rls
print(rls)

Get Table Contents

To retrieve the contents of a specified table:

table_name = 'YourTableName'
table_contents = model.get_table(table_name)
print(table_contents)

To decode only a subset of columns from a wide table (decoding the others is skipped), pass columns:

table_contents = model.get_table(table_name, columns=['ProductKey', 'Sales'])

Dictionary decode runs on a native Huffman kernel (xmhuffman) and fans out across cores automatically for large dictionaries.

Statistics

To get statistics about the model, including column cardinality and byte sizes of dictionary, hash index, and data components, in a dataframe with columns TableName, ColumnName, Cardinality, Dictionary, HashIndex, and DataSize:

statistics = model.statistics
print(statistics)

Tabular Model Schema (TMSCHEMA) Endpoints

Full equivalents of the Analysis Services $System.TMSCHEMA_* DMVs, read directly from the embedded SQLite metadata database.

Property	DMV equivalent
model.tmschema_model	TMSCHEMA_MODEL
model.tmschema_tables	TMSCHEMA_TABLES
model.tmschema_columns	TMSCHEMA_COLUMNS
model.tmschema_partitions	TMSCHEMA_PARTITIONS
model.tmschema_hierarchies	TMSCHEMA_HIERARCHIES
model.tmschema_levels	TMSCHEMA_LEVELS
model.tmschema_datasources	TMSCHEMA_DATASOURCES
model.tmschema_perspectives	TMSCHEMA_PERSPECTIVES
model.tmschema_perspective_tables	TMSCHEMA_PERSPECTIVE_TABLES
model.tmschema_perspective_columns	TMSCHEMA_PERSPECTIVE_COLUMNS
model.tmschema_perspective_hierarchies	TMSCHEMA_PERSPECTIVE_HIERARCHIES
model.tmschema_perspective_measures	TMSCHEMA_PERSPECTIVE_MEASURES
model.tmschema_kpis	TMSCHEMA_KPIS
model.tmschema_annotations	TMSCHEMA_ANNOTATIONS
model.tmschema_extended_properties	TMSCHEMA_EXTENDED_PROPERTIES
model.tmschema_cultures	TMSCHEMA_CULTURES
model.tmschema_translations	TMSCHEMA_OBJECT_TRANSLATIONS
model.tmschema_linguistic_metadata	TMSCHEMA_LINGUISTIC_METADATA
model.tmschema_query_groups	TMSCHEMA_QUERY_GROUPS
model.tmschema_calculation_groups	TMSCHEMA_CALCULATION_GROUPS
model.tmschema_calculation_items	TMSCHEMA_CALCULATION_ITEMS
model.tmschema_calculation_expressions	TMSCHEMA_CALCULATION_EXPRESSIONS
model.tmschema_variations	TMSCHEMA_VARIATIONS
model.tmschema_attribute_hierarchies	TMSCHEMA_ATTRIBUTE_HIERARCHIES
model.tmschema_sets	TMSCHEMA_SETS
model.tmschema_refresh_policies	TMSCHEMA_REFRESH_POLICIES
model.tmschema_detail_rows_definitions	TMSCHEMA_DETAIL_ROWS_DEFINITIONS
model.tmschema_format_string_definitions	TMSCHEMA_FORMAT_STRING_DEFINITIONS
model.tmschema_functions	TMSCHEMA_FUNCTIONS
model.tmschema_calendars	TMSCHEMA_CALENDARS
model.tmschema_calendar_column_groups	TMSCHEMA_CALENDAR_COLUMN_GROUPS
model.tmschema_calendar_column_refs	TMSCHEMA_CALENDAR_COLUMN_REFERENCES
model.tmschema_alternate_of	TMSCHEMA_ALTERNATE_OF
model.tmschema_related_column_details	TMSCHEMA_RELATED_COLUMN_DETAILS
model.tmschema_group_by_columns	TMSCHEMA_GROUP_BY_COLUMNS
model.tmschema_binding_info	TMSCHEMA_BINDING_INFO
model.tmschema_analytics_ai_metadata	TMSCHEMA_ANALYTICS_AI_METADATA
model.tmschema_data_coverage_definitions	TMSCHEMA_DATA_COVERAGE_DEFINITIONS
model.tmschema_role_memberships	TMSCHEMA_ROLE_MEMBERSHIPS

# Example — list all columns with their tables
print(model.tmschema_columns[["TableName", "Name", "DataType", "IsHidden"]])

# Example — inspect incremental refresh policies
print(model.tmschema_refresh_policies)

# Example — list all security roles and their members
print(model.tmschema_role_memberships)

Roadmap

Planned optimizations for very large models (Arrow output, direct zip-member mmap, RecordBatch streaming) are tracked in ROADMAP.md.