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...
This article discusses a problem that occurs during a query of a clustered columnstore index in Microsoft SQL Server 2014. This article providesa resolutionto this problem. Summary When you use a query that scans a clustered columnstore index...
You create a clustered columnstore index on a table in Microsoft SQL Server 2014. You drop the first column of the table. You restart SQL Server, and then delete rows from the table. In this scenario, an access violation occurs. Resolution Cumulative Update information The issue was first fix...
I recently came across an article on the Microsoft Tech Community blog about the availability of multi-column distribution for dedicated SQL pools in Azure Synapse Analytics (link:https://techcommunity.microsoft.com/t5/azure-synapse-analytics-blog/multi-column-distribution-for-ded...
This article describes the index rebuild process as well as index maintenance for clustered Columnstore indexes and is directed towards SQL 2014. In SQL 2016, there have been several index maintenance enhancements that will be covered in a separate post....
If a clustered index is created on a varchar column and the existing data is in the IN_ROW_DATA allocation unit, subsequent insert or update actions on the column that would push the data off-row fail. To obtain information about tables that might contain row-overflow data, use the sys....
the existing data is in theIN_ROW_DATAallocation unit, subsequent insert or update actions on the column that would push the data off-row fail. To obtain information about tables that might contain row-overflow data, use thesys.dm_db_index_physical_stats (Transact-SQL)dynamic management ...
SQL> create index emp_dept_cluster_idx 2 on cluster emp_dept_cluster; Index created. 创建簇表 SQL> create table dept 2 (deptno number(2) primary key, 3 dname varchar2(14), 4 loc varchar2(13) 5 ) 6 cluster emp_dept_cluster(deptno); --使用了cluster关键字后面跟簇名、簇列 ...
I will assume that we have one single column table with CCI that will contain JSON documents: create table deals ( data nvarchar(max), index cci clustered columnstore ); This is equivalent to collections that you might find in classic NoSQL database because they store each JSON document as...
In theSelect Columns fromtable_namedialog box, select the check box or check boxes of the table column or columns to be added to the nonclustered index. SelectOK. In theNew Indexdialog box, selectOK. Using Transact-SQL To create a nonclustered index on a table using Transact-SQL ...