Partition to Filegroup Mapping in SQL Server

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Suppose you have a partition function and a corresponding partition scheme in SQL Server. The partition scheme maps each partition to a filegroup. It also indicates the next used filegroup if one was specified. Sometimes it is useful to know which partition maps to which filegroup as well as which filegroup is marked as the next used filegroup (if any). Here is a query that does exactly that:

 

SELECT
	DestinationId				= DestinationDataSpaces.destination_id ,
	FilegroupName				= Filegroups.name ,
	PartitionHighBoundaryValue	= PartitionRangeValues.value ,
	IsNextUsed					=
		CASE
			WHEN
				DestinationDataSpaces.destination_id > 1
			AND
				LAG (PartitionRangeValues.value , 1) OVER (ORDER BY DestinationDataSpaces.destination_id ASC) IS NULL
			THEN
				1
			ELSE
				0
		END
FROM
	sys.partition_schemes AS PartitionSchemes
INNER JOIN
	sys.destination_data_spaces AS DestinationDataSpaces
ON
	PartitionSchemes.data_space_id = DestinationDataSpaces.partition_scheme_id
INNER JOIN
	sys.filegroups AS Filegroups
ON
	DestinationDataSpaces.data_space_id = Filegroups.data_space_id
LEFT OUTER JOIN
	sys.partition_range_values AS PartitionRangeValues
ON
	PartitionSchemes.function_id = PartitionRangeValues.function_id
AND
	DestinationDataSpaces.destination_id = PartitionRangeValues.boundary_id
WHERE
	PartitionSchemes.name = N'YourPartitionScheme'
ORDER BY
	DestinationId ASC;

Download script here: Partition to Filegroup Mapping in SQL Server- Script

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