whichdb
vs

InMemory.Net vs Microsoft SQL Server

InMemory.Net: Commercial in-memory columnar SQL engine for .NET that speeds up reporting over hundreds of millions of rows. Microsoft SQL Server: Microsoft's flagship RDBMS: T-SQL, columnstore, Always On, and now native vectors and JSON.

key differences

  • InMemory.Net is primarily a columnar / OLAP database; Microsoft SQL Server is relational.
  • Microsoft SQL Server is built for larger datasets (≤ 1 PB) than InMemory.Net (≤ 100 GB).
  • Horizontal scaling is none in InMemory.Net and manual in Microsoft SQL Server.
  • Transactions: InMemory.Net offers none ACID; Microsoft SQL Server offers full.
  • Only Microsoft SQL Server has transactions, secondary indexes, full-text search, vector search, geospatial.

choose inmemory-net for

  • +Accelerating slow SQL Server or ODBC-backed reports
  • +Embedded analytics inside .NET line-of-business applications
  • +Interactive dashboards over tens of millions of rows on a desktop

best at · OLAP, Real-time analytics

choose sql-server for

  • +Line-of-business apps in .NET shops
  • +ERP and CRM back ends (Dynamics, many ISV products)
  • +Operational reporting with columnstore indexes
  • +Departmental data marts feeding Power BI

best at · OLTP, HTAP, Warehouse

InMemory.NetCommercial in-memory columnar SQL engine for .NET that speeds up reporting over hundreds of millions of rows.
Microsoft SQL ServerMicrosoft's flagship RDBMS: T-SQL, columnstore, Always On, and now native vectors and JSON.
overview
Primary model
Columnar / OLAP
Relational
Also supports
Relational
Document, Spatial, Vector, Graph, XML
Type
Database engine
Database engine
Status
Active
Active
Developer
InMemory.Net (Cork, Ireland)
Microsoft
First release
2014
1989
Latest version
–
2025 CU10 (17.0.5035.5) (Oct 22, 2026)
License
ProprietaryProprietary (per-server, SaaS and OEM licenses)
ProprietaryMicrosoft commercial license
Free tier
—
✓
popularity
WhichDB Score
0.2
71.0
Rank
#668
#8
GitHub stars
–
–
Stack Overflow questions
–
336.2K
scale & guarantees
Comfortable data size
Small (≤ 100 GB)
Large (≤ 1 PB)
Horizontal scaling
None
Manual
Multi-region
None
Read replicas
ACID
None
Full
Consistency
Strong
Strong
Schema
Strict
Strict
Architecture
In memory, Client server, Single node
Client server, Primary replica, Shared storage
deployment
Self-hosted
✓
✓
Vendor-managed cloud
—
✓
Serverless
—
—
Embedded
—
—
Edge
—
—
Clouds
–
Azure, AWS, Google Cloud
capabilities
Transactions
—
✓
Joins
✓
✓
Secondary indexes
—
✓
Full-text search
—
✓
Vector search
—
✓
Geospatial
—
✓
JSON
—
✓
Change data capture
—
✓
Triggers
—
✓
Stored procedures
—
✓
Materialized views
—
✓
TTL / expiry
—
—
Pub/Sub
—
—
Columnar storage
✓
✓
In-memory
✓
✓
Durable persistence
✓
✓
Compression
✓
✓
Encryption at rest
—
✓
Role-based access
—
✓
Time travel
—
✓
Branching
—
—
Online schema changes
—
✓
Streaming ingest
—
—
Offline sync
—
—
Runs in WebAssembly
—
—
interfaces
Query languages
SQL, LINQ
T-SQL
Client languages
C#
C#, Java, Python, JavaScript, Go, PHP, Rust, C
Best for
OLAP, Real-time analytics
OLTP, HTAP, Warehouse, Real-time analytics
Add more to this comparisonNot sure either fits? Try smart match

InMemory.Net vs Microsoft SQL Server: FAQ

What is the difference between InMemory.Net and Microsoft SQL Server?

InMemory.Net: Commercial in-memory columnar SQL engine for .NET that speeds up reporting over hundreds of millions of rows. Microsoft SQL Server: Microsoft's flagship RDBMS: T-SQL, columnstore, Always On, and now native vectors and JSON. InMemory.Net is primarily a columnar / OLAP database; Microsoft SQL Server is relational. Microsoft SQL Server is built for larger datasets (≤ 1 PB) than InMemory.Net (≤ 100 GB). Horizontal scaling is none in InMemory.Net and manual in Microsoft SQL Server.

When should I choose InMemory.Net over Microsoft SQL Server?

Choose InMemory.Net for accelerating slow SQL Server or ODBC-backed reports, embedded analytics inside .NET line-of-business applications and interactive dashboards over tens of millions of rows on a desktop. Choose Microsoft SQL Server for line-of-business apps in .NET shops; ERP and CRM back ends (Dynamics, many ISV products); and operational reporting with columnstore indexes.

Is InMemory.Net or Microsoft SQL Server more popular?

Microsoft SQL Server ranks #8 on the WhichDB Score (71.0/100) and InMemory.Net ranks #668 (0.2/100). Popularity is not fit: check the requirements that matter for your project.

Are InMemory.Net and Microsoft SQL Server open source?

No. InMemory.Net is proprietary, closed-source software. No. Microsoft SQL Server is proprietary, closed-source software. License: Microsoft commercial license.