Create, Alter, and Drop Selective XML Indexes

Describes how to create a new selective XML index, or alter or drop an existing selective XML index.

For more information about selective XML indexes, see Selective XML Indexes (SXI).

In This Topic

Create a Selective XML Index by Using Transact-SQL
Create a selective XML index by calling the CREATE SELECTIVE XML INDEX statement. For more information, see CREATE SELECTIVE XML INDEX.

Example

The following example shows the syntax for creating a selective XML index. It also shows several variations of the syntax for describing the paths to be indexed, with optional optimization hints.
```
CREATE SELECTIVE XML INDEX sxi_index
ON Tbl(xmlcol)

FOR(
    pathab   = '/a/b' as XQUERY 'node()'
    pathabc  = '/a/b/c' as XQUERY 'xs:double', 
    pathdtext = '/a/b/d/text()' as XQUERY 'xs:string' MAXLENGTH(200) SINGLETON
    pathabe = '/a/b/e' as SQL NVARCHAR(100)
)
```

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Alter a Selective XML Index by Using Transact-SQL
Alter an existing selective XML index by calling the ALTER INDEX statement. For more information, see ALTER INDEX (Selective XML Indexes).

Example

The following example shows an ALTER INDEX statement. This statement adds the path '/a/b/m' to the XQuery part of the index and deletes the path '/a/b/e' from the SQL part of the index created in the example in the topic CREATE SELECTIVE XML INDEX. The path to delete is identified by the name that was given to it when it was created.
```
ALTER INDEX sxi_index
ON Tbl
FOR 
(
    ADD pathm = '/a/b/m' as XQUERY 'node()' ,
    REMOVE pathabe
)
```

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Drop a Selective XML Index by Using Transact-SQL
Drop a selective XML index by calling the DROP INDEX statement. For more information, see DROP INDEX (Selective XML Indexes).

Example

The following example shows a DROP INDEX statement.
```
DROP INDEX sxi_index ON tbl
```

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