SQL Server Log Writer Workers

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SQL Server 2017 leverages up to 4 log writer workers, on hidden schedulers, to assist in transaction log processing activities.   You may find the number of log write workers has been increased to 8 when running newer releases of SQL Server to accommodate larger systems.  (Caution: Pre-release software may change before final release.)


During SQL Server startup the number of log writer workers is determined. 


If multiple log write workers are not allowed use a single log writer



Total number NUMA nodes * 2 Count the number of available CPUs on the NUMA node