<ul><li>Running parallel queries in EF Core with PostgreSQL can result in a 'A command is already in progress' error.</li><li>PostgreSQL doesn't support parallel query execution within the same connection, unlike SQL Server.</li><li>Options to fix this issue include using separate database contexts for the queries or running the queries sequentially.</li><li>It is important to consider the limitations of parallel query execution, as it can lead to deadlocks or timeouts.</li></ul>

Parallel Queries in EF Core with PostgreSQL: Why It Fails and How to Fix It

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