May 2019
Intermediate to advanced
484 pages
11h 23m
English
Content preview from Learn T-SQL Querying
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Columnstore Index Scan
The indexes we've discussed so far are what are referred to as rowstore indexes. These perform well for Online Transaction Processing (OLTP) workloads, but Data Warehouse (DW) or Online Analytical Processing (OLAP) workloads often benefit from a different type of data storage called columnstore. In a columnstore index, a page of data contains a single column for one or more rows of data in the table. Columnstore indexes were introduced in SQL Server 2012 and provide a way to store large amounts of read-only or read-mostly data in a heavily-compressed format with specialized operators that can process large amounts of data quickly. The only way to access data in a columnstore index is with the Columnstore Index Scan ...
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