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The same query is instant in staging and takes five seconds in front of a real user.
What you'll have at the end
A dashboard query taken from seconds to milliseconds, with the partition or cluster key that fixed it
You need
A dashboard query already running against a warehouse fact table with years of history, and the ability to run that query with its execution plan against both the production table and a smaller copy of it.
Not covered
Choosing sort or cluster keys inside a partition, or deciding whether the report belongs on a warehouse at all rather than the live application database.
OLTP vs OLAP: decide when a report needs its own warehouse
if the slow report is still hitting the live application database rather than a warehouse table, that decision comes first
Star schema or one big table: which does your new dashboard need?
when partitioning alone doesn't get a dashboard fast enough, the table's overall shape is the next thing worth questioning
Checked 25 Aug 2026
Part of the Data Warehousing cookbook