Quick Tempdb Summary

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-- Quick Tempdb Summary
SELECT
    SUM(user_object_reserved_page_count) * 8.192 AS UserObjectsKB,
    SUM(internal_object_reserved_page_count) * 8.192 AS InternalObjectsKB,
    SUM(version_store_reserved_page_count) * 8.192 AS VersonStoreKB,
    SUM(unallocated_extent_page_count) * 8.192 AS FreeSpaceKB
FROM sys.dm_db_file_space_usage