Hi Marcia,

The limitations are imposed by the database server you're using.

For PostgreSQL (https://www.postgresql.org/about), it's anywhere from 250 to 1600 depending on the column type per table.

For Microsoft SQL (https://docs.microsoft.com/en-us/sql/sql-server/maximum-capacity-specifications-for-sql-server), it's 1024 columns per non-wide table.

If your datasource has "thousands" of columns, there would be no way to upload this data into LabKey, not without breaking up the data across multiple tables.

Regards,

Jon