December 2013
Intermediate to advanced
1872 pages
153h 31m
English
book
Microsoft® SQL Server 2012 Unleashed
by Ray Rankins, Paul T. Bertucci, Chris Gallelli, Alex T. Silverstein
Content preview from Microsoft® SQL Server 2012 Unleashed
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xVelocity Columnstore Indexes
SQL Server 2012 PDW uses the new updateable version of xVelocity columnstore capabilities as a part of PDW for added linear scale out.
This is a memory-optimized columnstore index, which is both updateable and clustered. In the standard SQL Server 2012 Database Engine, columnstore indexes don’t allow table updates to tables with columnstore indexes.
By reorienting data in a column format rather than a traditional row store, you can get up to 50 times the performance gains. This is due to the grouping of data into a columnar format, which contains values from multiple rows. The net effect is much higher efficiency in both storage and the dataset processing of column-oriented SQL queries.