| Solution | Portability | SQL Compatibility | Best For | |----------|-------------|-------------------|----------| | | ✅ Fully portable (single DLL) | Limited SQL, no stored procs | Small apps, embedded use | | LiteDB (NoSQL) | ✅ Fully portable (DLL + file) | C# LINQ, no T-SQL | .NET apps needing NoSQL | | PostgreSQL portable (third-party) | ⚠️ Partial, complex | Full SQL | When you need real RDBMS portable | | SQL Server Compact (deprecated) | ✅ Was portable | Very limited | Legacy projects only |
Most people asking for "MS SQL Server Express portable" actually want one of these scenarios: ms sql server express portable
Server=.\SQLEXPRESS;AttachDbFilename=C:\MyData\MyDB.mdf;User Instance=true; | Solution | Portability | SQL Compatibility |
User Instances were deprecated after SQL Server 2012. Modern SQL Server Express (2014+) uses Contained Databases and AttachDbFileName without the "User Instance" flag, but again, the main service must be pre-installed. no stored procs | Small apps
On your USB drive (e.g., E:\ ), create:
