Symptoms Assume that you have a table that has a clustered columnstore index in Microsoft SQL Server 2014. When you insert data into the table (for example, you use a bulk insert or INSERT SELECT), an error is raised while the insert is being initialized, and then an access violation occu...
As part of continuous improvement of the quality of SQL Server, we add new tests to stress the features in various ways. We recently discovered a corruption issue in clustered columnstore index in SQL Server 2014 as part of new stress tests. After analyzi...
Assume that you have installed Microsoft SQL Server 2016 Service Pack 1 (SP1). When you use the SELECT TOP N statement with a very large N (tens or hundreds of thousands) to retrieve data from a columnstore in...
INDEX REBUILD:This can be done at a partition Level for a partitioned table, and is an offline index build and at this point there isn’t an ONLINE equivalent. The Rebuild reads and recompresses all the data in the specified partition or the entire index. In an up...
First published on MSDN on Dec 07, 2016 Columnstore index is the preferred technology to run analytics queries in Azure SQL Databases. We recentlyannounced general availabilityof In-Memory technologies for all Premium databases. Similar toIn-Memory OLTP, the columnstore index technology is not ...
In the next step, let’s check how large delta store affects performance of the queries. For that test, I inserted one million rows to the table using small batches and run the test query. After that, I rebuilt the columnstore index, comparing the execution time of the test query before...
Documentation uses the term B-tree generally in reference to indexes. In rowstore indexes, the Database Engine implements a B+ tree. This does not apply to columnstore indexes or indexes on memory-optimized tables. For more information, see theSQL Server and Azure SQL index architecture a...
The focus of this blog is to introduce SSIS changes in the Data Flow task in SQL Server 2016 that help data loading into Columnstore tables. On SQL Server relational data warehouses, Columnstore indexes are being widely used due to the immense ...
Documentation uses the term B-tree generally in reference to indexes. In rowstore indexes, the Database Engine implements a B+ tree. This does not apply to columnstore indexes or indexes on memory-optimized tables. For more information, see theSQL Server and Azure SQL index architecture and des...
Applies ToSQL Server 2014 Enterprise - duplicate (do not use) SQL Server 2017 Enterprise on Windows Symptoms Consider the following scenario: You create a clustered columnstore index on a partitioned table. The...