ADOMD.NET: Beyond Rows and Columns – The Multidimensional Evolution of ADO.NET

by Joche Ojeda | Jan 20, 2025 | ADO, ADO.NET, Database, dotnet

When I first encountered the challenge of migrating hundreds of Visual Basic 6 reports to .NET, I never imagined it would lead me down a path of discovering specialized data analytics tools. Today, I want to share my experience with ADOMD.NET and how it could have transformed our reporting challenges, even though we couldn’t implement it due to our database constraints.

The Challenge: The Sales Gap Report

The story begins with a seemingly simple report called “Sales Gap.” Its purpose was critical: identify periods when regular customers stopped purchasing specific items. For instance, if a customer typically bought 10 units monthly from January to May, then suddenly stopped in June and July, sales representatives needed to understand why.

This report required complex queries across multiple transactional tables:

• Invoicing
• Sales
• Returns
• Debits
• Credits

Initially, the report took about a minute to run. As our data grew, so did the execution time—eventually reaching an unbearable 15 minutes. We were stuck with a requirement to use real-time transactional data, making traditional optimization techniques like data warehousing off-limits.

Enter ADOMD.NET: A Specialized Solution

ADOMD.NET (ActiveX Data Objects Multidimensional .NET) emerged as a potential solution. Here’s why it caught my attention:

Key Features:

1. Multidimensional Analysis

   Unlike traditional SQL queries, ADOMD.NET uses MDX (Multidimensional Expressions), specifically designed for analytical queries. Here’s a basic example:

   string mdxQuery = @"
       SELECT 
           {[Measures].[Sales Amount]} ON COLUMNS,
           {[Date].[Calendar Year].MEMBERS} ON ROWS
       FROM [Sales Cube]
       WHERE [Product].[Category].[Electronics]";

2. Performance Optimization

   ADOMD.NET is built for analytical workloads, offering better performance for complex calculations and aggregations. It achieves this through:

   • Specialized data structures for multidimensional analysis
   • Efficient handling of hierarchical data
   • Built-in support for complex calculations

3. Advanced Analytics Capabilities

   The tool supports sophisticated analysis patterns like:

   string mdxQuery = @"
       WITH MEMBER [Measures].[GrowthVsPreviousYear] AS
           ([Measures].[Sales Amount] - 
           ([Measures].[Sales Amount], [Date].[Calendar Year].PREVMEMBER)
           )/([Measures].[Sales Amount], [Date].[Calendar Year].PREVMEMBER)
       SELECT 
           {[Measures].[Sales Amount], [Measures].[GrowthVsPreviousYear]} 
       ON COLUMNS...";

Lessons Learned

While we couldn’t implement ADOMD.NET due to our use of Pervasive Database instead of SQL Server, the investigation taught me valuable lessons about report optimization:

1. The importance of choosing the right tools for analytical workloads
2. The limitations of running complex analytics on transactional databases
3. The value of specialized query languages for different types of data analysis

Modern Applications

Today, ADOMD.NET continues to be relevant for organizations using:

• SQL Server Analysis Services (SSAS)
• Azure Analysis Services
• Power BI Premium datasets

If I were facing the same challenge today with SQL Server, ADOMD.NET would be my go-to solution for:

• Complex sales analysis
• Customer behavior tracking
• Performance-intensive analytical reports

Conclusion

While our specific situation with Pervasive Database prevented us from using ADOMD.NET, it remains a powerful tool for organizations using Microsoft’s analytics stack. The experience taught me that sometimes the solution isn’t about optimizing existing queries, but about choosing the right specialized tools for analytical workloads.

Remember: Just because you can run analytics on your transactional database doesn’t mean you should. Tools like ADOMD.NET exist for a reason, and understanding when to use them can save countless hours of optimization work and provide better results for your users.