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Default value for Cost Threshold For Parallelism may give deadlocks #812

@rasmus

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@rasmus

Deadlocks for MSSQL read models have been observed in production systems and a fix seems to be increasing the "Cost Threshold For Parallelism" in SQL Server.

Consider if EventFlow should log a warning upon initialization if the default value is set.

https://www.brentozar.com/archive/2017/03/why-cost-threshold-for-parallelism-shouldnt-be-set-to-5/

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