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Clustered Property

  • Artikkeli

Version: Available or changed with runtime version 1.0.

Sets a value that indicates whether the key also defines the clustered index in the database.

By default the primary key is configured as the clustered key.

Applies to

  • Table key

Note

The Clustered property cannot be used in table extension objects.

Property value

True if the index is clustered, otherwise false. The default is false.

Syntax

Clustered = true;

Remarks

A clustered index determines the physical order in which records are stored in the table. Using a clustered key can improve the time it takes to retrieve records.

There can be only one clustered key on a table.

Example

The following example defines a secondary key to be a clustered index.

keys
{
    // the first key defined in the keys section is the primary key
    key(PrimaryKey; ID)
    {
        Clustered = false;
    }
    key(CustomerInfo; Name,Address,City)
    {
        Clustered = true;
    }
}

Table Key