Partition elimination is very important when SQL Server executes queries against partitioned tables or partitioned views. In general, SQL Server is doing an excellent job of not scanning the partitions that are
Assume that you use Microsoft SQL Server 2016. When you query against sys.dm_db_partition_stats Dynamic Management View (DMV) on a database that contains large numbers of columnstore partitions, the query might take a long time to complete. Resolution This issue is fixed in the following cumu...
When you query the Dynamic Management Views (DMV) sys.dm_db_index_operational_stats in SQL Server 2017 or 2019, you may notice that the object_id returned by the DMV for the swapped partitions is incorrect after you switch ...
Query the dbo.PartitionTable and uses $PARTITION.RangePF1(col1) in the GROUP BY clause to query the number of rows in each partition that contains data. SQL Copy SELECT $PARTITION.RangePF1 (col1) AS Partition, COUNT(*) AS [COUNT] FROM dbo.PartitionTable GROUP BY $PARTITION.RangePF1...
SQL Server can only perform an index seek on the second column of a multi-column index if there exists an equality predicate on the first column. Clearly, there is not an equality predicate on the [PtnId] column in this query and yet there is a predicate on column A. What's going on...
Queries the dbo.PartitionTable and uses $PARTITION.RangePF1(col1) in the GROUP BY clause to query the number of rows in each partition that contains data. Obs! To execute this example, you must first create the partition function RangePF1 using the code in the previous example. SQL Kopier...
Windows Server 2003 and SQL Server 2005 were installed. A query was executed that the customer used to benchmark performance. Prior to each run, DBCC DROPCLEANBUFFERS was executed to clear the SQL Server buffer cache, which ensured that all data required to satisfy the workload was loaded from...
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Learn more about partition elimination and related concepts in Query Processing Enhancements on Partitioned Tables and Indexes. Limitations The scope of a partition function and scheme is limited to the database in which they have been created. Within the database, partition functions reside in a ...