Examples of using Clustered index in English and their translations into Korean
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For example, when you create a clustered index on a view, distribution statistics cannot be evaluated, because the clustered index does not yet exist.
involved in join and grouping operations, and a clustered index on any foreign key columns.
Generally, nonclustered indexes should be designed to improve the performance of frequently used queries that are not covered by the clustered index.
Bytes per index key: The maximum number of bytes in a clustered index key cannot exceed 900 in SQL Server.
The clustered index key is automatically included in all nonclustered indexes,
Nonclustered A nonclustered index can be defined on a table or view with a clustered index or on a heap.
If the table has nonclustered indexes, all the nonclustered indexes must all be recreated whenever the clustered index is changed.
You can specify that a unique clustered index be created if a clustered index does not already exist.
Allows users to access the underlying table or clustered index data and any associated nonclustered indexes during the index operation.
The clustered index is implemented as a B-tree index structure that supports fast retrieval of the rows, based on their clustered index key values.
A clustered index sorts and stores the data columns of a table or view in order, based on the clustered index key.".
You can specify that a unique clustered index be created if a clustered index does not already exist on the table.
If a table already has a clustered index, drop the clustered index to return the table to a heap.
A sparse column cannot be used as a partition key of a clustered index or heap.
Re-creating a clustered index reorganizes the data, and causes full data pages.
Non clustered A non clustered index can be defined on a table or view with a clustered index or on a heap.
If the clustered index is not created with the UNIQUE property, the Database Engine automatically adds a 4-byte uniqueifier column to the table.
The NOEXPAND view hint forces the query optimizer to treat the view like an ordinary table with a clustered index.
In a clustered index, the leaf nodes contain the data pages of the underlying table.
Sometimes data architects use heaps when data is always accessed through nonclustered indexes and the RID is smaller than a clustered index key.