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Since index statistics CX_Sales_Customer Transactions is updated using FULLSCAN, updating partition level statistics with RESAMPLE will also use FULLSCAN.Manually updating partition 1 and partition 5 statistics took 39 ms.RESAMPLE reads the leaf-level statistics using the same sample rates and merge this result back into the main statistics histogram.A different partition sampling rate cannot be merged together and the syntax constraints made sure this does not occur as well.Whilst the partition level statistics are not used by SQL Server CE, allowing finer grain control to only update subset of the main statistics based on partitions which has changed data only helps tremendously with the performance of statistics maintenance.Consider these free tools for SQL Server that improve database developer productivity.

Imagine the data distribution remain the same for all previous partitions, and you only need SQL Server to know the changed data distribution for a newly created\loaded partition.If you refer to the main statistics histogram, 87.6 is the AVG_RANGE_ROWS value for Transaction Date = 2016-05-31.So, SQL Server uses the main statistics histogram to get the CE and not the incremental statistics histogram.Accurate statistics are essential to allow query optimizer to generate a good enough query plan.In a very large partitioned table, updating table statistics requires to sample rows across all partitions and the statistics reflects the data distribution of the table as whole.To prove this statement, we will use DBCC SHOW_STATISTICS to get the statistics histogram of the main statistics and the incremental statistics and test the CE with a simple query.At the time of this article, the only way to get detailed content of statistics histogram is to use DBCC SHOW_STATISTICS.We will insert 10 rows each into partition 1 and partition 5.The INSERT will not kick off automatic update statistics since the number of rows inserted are very small relative to the total number of rows in the table.The main statistics which get updates from partition level statistics is the statistics that SQL Server will use.CE refers to an estimated prediction of the number of rows in query result and primarily derived from histograms that are created when indexes or statistics are created.

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