xVelocity Columnstore Indexes
SQL Server 2014 PDW uses the 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 SQL Server 2012 Database Engine, columnstore indexes didn’t allow table updates to tables with columnstore indexes. In SQL Server 2014, these are now updateable.
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. ...
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