When performing transactions in NAV so called SIFT (Sum Index Flowfield Technology ™) tables (SQL Server option only) are used to save aggregated values about Sum Index Fields to be used in FlowFields which are providing these values.Usually many of these SIFT records could contain only “sums” of value zero. These records are not required to provide the FlowField feature in NAV and should be erased periodically to keep the number of records within the SIFT tables as small as possible, to increas 
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