Did Microsoft change query optimizer regarding number of files and parallelism? Does the optimizer no longer factor in the number of files to determine the degree of parallelism for a query? If so, does anyone know when the change was made? If not, can anyone provide a link to Microsoft documentation that discusses the topic (current documentation for either SQL Server 2014 or 2016)?
Sql-server – Did Microsoft change query optimizer regarding number of files and parallelism
optimizationparallelismsql serversql server 2014
Best Answer
That was an urban legend that Microsoft's Bob Dorr debunked back in 2007:
Read the post for much more detail.