Disable tests parallelization in flaky OleDB tests #119018
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This was referenced Aug 22, 2025
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Attempts to fix dotnet#87783
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Pull Request Overview
This PR addresses flaky OleDB tests by disabling test parallelization to work around concurrency issues in the ACE/Access OleDB driver.
- Adds an AssemblyInfo.cs file to disable test parallelization for the OleDB test suite
- Implements a temporary workaround for known concurrency issues in the Microsoft ACE OleDB driver
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There's reason to believe that the flakiness in #87783 is caused by concurrency issues in the ACE/Access OleDB driver being used (e.g. here). So as an easy attempt to get rid of the flakiness, I'm disabling parallelization altogether in these tests. I suggest we merge this and observe what happens in the next few days/weeks.
If this doesn't fix the flakiness, we should move away from ACE to SQL Server / LocalDB. There's a good chance we'd need to install components on the runner image though, so we'd probably want to skip the tests until that happens.
@jeffschwMSFT @jeffhandley @SamMonoRT