It is not a normal behavior of SQL Server to generate minidumps. It is like a stress signal in SQL. When there is something “unexpected”, SQL Server kills the SPID and generates a dump. There are situations where SQL threads are not yielding (“Non-yielding Scheduler”, “Non-yielding IOCP Listener” or “Non-yielding Resource Monitor”) and there would be data needed to diagnose the problem later, so a dump is generated. These dumps are in the folder which has ERROLROG files. They can be triggered manually also using SQLDumper.exe for SQLDump.
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