topic Re: WebRequestTimeout When Importing Schema From ODBC Source in Data Engineering

WebRequestTimeout When Importing Schema From ODBC Source

Fabricator101 — Sat, 22 Mar 2025 14:29:17 GMT

We are trying to migrate our tables from Sybase database. While creating copy activity for some of the tables, during import schema in table mappings, we get the following error:

Error code

WebRequestTimeout

Details

Failed to import source schema. A task was canceled. Activity ID:

Any idea why this timeout is happening or how to increase the amount of time for the import schema option to complete? It will be very time consuming for us to manually create each column mapping with 70+ columns for many tables. Please advise.

Thanks

Re: WebRequestTimeout When Importing Schema From ODBC Source

v-hashadapu — Mon, 24 Mar 2025 04:58:41 GMT

Hi @Fabricator101 , Thank you for reaching out to the Microsoft Community Forum.

The timeout issue during schema import from your Sybase database could be due to network latency, large schema size, inefficient queries, or insufficient timeout settings. To address this, increase timeout settings in Microsoft Fabric Pipelines and Linked Service for Sybase, use schema mapping export/import to avoid repeated imports, switch to Dataflow Gen2 for large tables, use Fabric Spark Notebooks for complex migrations, and optimize Sybase performance by rebuilding indexes and updating statistics.

If this helped solve the issue, please consider marking it 'Accept as Solution' so others with similar queries may find it more easily. If not, please share the details, always happy to help.
Thank you.

Re: WebRequestTimeout When Importing Schema From ODBC Source

Fabricator101 — Thu, 27 Mar 2025 10:56:47 GMT

The import schema source table has large amount of rows. Due to this fact, import scema fails to gather/sample data types of columns. This in-turn gives web timeout. The solution, that I have found is to use query instead of table name in the source parameter. And do a SELECT TOP 100 * from [table_name]. This will allow the mapping within web time limit. Once mappings are done, change source query to source table name.