I have tables partitioned by date with various frequency space (multi-years, years, quarters, months etc.)

sys.partition_functions gives name and function_id.

Is there a way to query the actual definition of a function?

I'd like to join it to a partition size/rowcount view from sys.partitions so that when looking at space and rowcount it's immediately obvious for what time period the data is - as opposed to having a partition_number and looking up by hand.

1 Answer 1


This query will return the partition boundaries for each partitioned table/view/index along with the row count of each partition.

Retrieving detailed space information can be expensive if you have many objects /partitions so I generally leave that code commented-out unless I need the info.

      CONCAT(QUOTENAME(OBJECT_SCHEMA_NAME(p.object_id)), N'.', QUOTENAME(OBJECT_NAME(p.object_id))) AS ObjectName 
    , i.name AS IndexName
    , p.index_id AS IndexID 
    , ds.name AS PartitionScheme 
    , p.partition_number AS PartitionNumber 
    , fg.name AS FileGroupName 
    , prv_left.value AS LowerBoundaryValue 
    , prv_right.value AS UpperBoundaryValue 
    , CASE pf.boundary_value_on_right WHEN 1 THEN 'RIGHT' ELSE 'LEFT' END AS PartitionFunctionRange 
    , p.rows AS Rows
--  , pst.used_page_count AS UsedPages,
--  , pst.used_page_count * 8 AS UsedSpaceKB,
--  , pst.reserved_page_count as ReservedPages,
--  , pst.reserved_page_count * 8 as ReservedSpaceKB
    sys.partitions AS p 
    --INNER JOIN sys.dm_db_partition_stats AS pst ON p.partition_id = pst.partition_id
    INNER JOIN sys.indexes AS i ON i.[object_id] = p.[object_id] AND i.index_id = p.index_id
    INNER JOIN sys.data_spaces AS ds ON ds.data_space_id = i.data_space_id
    INNER JOIN sys.partition_schemes AS ps ON ps.data_space_id = ds.data_space_id
    INNER JOIN sys.partition_functions AS pf ON pf.function_id = ps.function_id
    INNER JOIN sys.destination_data_spaces AS dds2 ON dds2.partition_scheme_id = ps.data_space_id AND dds2.destination_id = p.partition_number
    INNER JOIN sys.filegroups AS fg ON fg.data_space_id = dds2.data_space_id
    LEFT OUTER JOIN sys.partition_range_values AS prv_left ON ps.function_id = prv_left.function_id AND prv_left.boundary_id = p.partition_number - 1
    LEFT OUTER JOIN sys.partition_range_values AS prv_right ON ps.function_id = prv_right.function_id AND prv_right.boundary_id = p.partition_number
    , IndexID
    , p.partition_number;

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.