Those pooling parameters [are not documented for Microsoft.Data.Sqlite][1]. You can't just copy a connection string meant for one DBMS engine or one particular ADO.NET provider and expect it to apply 100% to another. **EDIT:** …Or do you mean System.Data.SQLite? (You can't just say ".NET" and expect us to know which library you're using!) I managed to get the CHM help for System.Data.SQLite converted to something useful on this non-Windows system, and I see that it does document these parameters, but all I can tell from the docs is that this library *has* a connection pool, not what you're supposed to do to make it do anything useful. I suppose you'll have to [read the source code][2] to work that out. [1]: https://docs.microsoft.com/en-us/dotnet/standard/data/sqlite/connection-strings [2]: https://system.data.sqlite.org/index.html/dir