--Drop the clustered rowstore index.DROPINDEX[IDX_CL_MyFactTable]ONdbo.MyFactTable; GO--Create a new clustered columnstore index with the name MyCCI.CREATECLUSTERED COLUMNSTOREINDEXIDX_CCL_MyFactTableONdbo.MyFactTable; GO 选项2:转换为列存储,并重复使用现有行存储聚集索引名称。
重新创建Column Store Index CREATE CLUSTERED INDEX [CCI_FactClick] ON [dbo].[FactClick]([ClickId]) ON [EmailYearlyPS] ([EmailGenerationDateKey]); CREATE CLUSTERED COLUMNSTORE INDEX [CCI_FactClick] ON [dbo].[FactClick] WITH (DROP_EXISTING = ON) ON [EmailYearlyPS] ([EmailGenerationDateKey])...
A clustered columnstore index is the physical storage for the entire table.To reduce fragmentation of the column segments and improve performance, the columnstore index might store some data temporarily into a clustered index called a deltastore and a B-tree list of IDs for deleted rows. The ...
当我们在SQL Server 2012中创建索引会提示有Columnstore Index和NONCLUSTERED COLUMNSTORE INDEX。在数据库中存储数据分为两种,一种是行存储,另外一种则是列存储,行存储是在页上存储所有行数据,而列存储则是在相同页上存储一列所有数据,所以利用列存储查找数据会更加快而不是查找整行上的所有数据,当然这也就意味着查...
--Create a nonclustered columnstore index on a disk-based table. CREATE [NONCLUSTERED] COLUMNSTORE INDEX index_name ON { database_name.schema_name.table_name | schema_name.table_name | table_name } ( column [ ,...n ] ) [ WHERE <filter_expression> [ AND <filter_expression> ] ] ...
当我们在SQL Server 2012中创建索引会提示有Columnstore Index和NONCLUSTERED COLUMNSTORE INDEX。在数据库中存储数据分为两种,一种是行存储,另外一种则是列存储,行存储是在页上存储所有行数据,而列存储则是在相同页上存储一列所有数据,所以利用列存储查找数据会更加快而不是查找整行上的所有数据,当然这也就意味着查...
此示例将名为MyFactTable的表中的聚集行存储索引转换到聚集列存储索引。 索引名称ClusteredIndex_d473567f7ea04d7aafcac5364c241e09保持不变。 SQL CREATECLUSTERED COLUMNSTOREINDEXClusteredIndex_d473567f7ea04d7aafcac5364c241e09ONMyFactTableWITH(DROP_EXISTING =ON); ...
Query Performance:Key point to note below is that with clustered columnstore index, the example query runs 5x faster on P1 compared to the same query running on P15 with rowstore with no tuning. This can significantly lower the cost you need to pay to meet your workload requirements. ...
To return the correct query results, the clustered columnstore index combines query results from both the columnstore and the deltastore.Note 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 ...
CREATE COLUMNSTORE INDEX (Transact-SQL) ALTER INDEX (使用 REBUILD 的 Transact-SQL)。 DROP INDEX (Transact-SQL) 聚集列存储索引 对于常见任务,请参阅Using Clustered Columnstore Indexes。 创建群集的列存储索引 (Transact-SQL) ALTER INDEX (使用 REBUILD 或 REORGANIZE 的Transact-SQL)。