小编Key*_*dly的帖子

我最近一直在研究 Selective Xml Indexing 并一直试图弄清楚如何索引一个.query方法

如果我有以下查询

WITH XMLNAMESPACES (Default 'http://www.w3.org/2001/XMLSchema' )
SELECT 

    ,a.value('@Number' , 'INT') As Number
    ,c.query('.') as FormattedXml

    From

    dbo.XmlTable As X

    Cross Apply x.XmlColumn.nodes('Root') aa(a) 
    Cross Apply a.nodes('Block') bb(b)

如果我正确地遵循它，我可以编写如下的选择性索引：

CREATE SELECTIVE XML INDEX xsi_XmlTable
ON dbo.XmlTable( XmlColumn )
WITH XMLNAMESPACES ( Default 'http://www.w3.org/2001/XMLSchema' )
FOR
(
      root = '/Root' AS XQUERY 'node()'
    , rootNumber = '/Root/@Number' AS SQL INT SINGLETON

)
GO

我可以在索引中包含 c.query 吗？谢谢

我创建了一个扩展事件来监视和调整 Selective Xml 索引

CREATE EVENT SESSION [SelectiveXmlIndexing] ON SERVER 
ADD EVENT sqlserver.selective_xml_index_no_compatible_sql_type,
ADD EVENT sqlserver.selective_xml_index_no_compatible_xsd_types,
ADD EVENT sqlserver.selective_xml_index_path_not_indexed,
ADD EVENT sqlserver.selective_xml_index_path_not_supported
WITH (MAX_MEMORY=4096 KB,EVENT_RETENTION_MODE=ALLOW_SINGLE_EVENT_LOSS,MAX_DISPATCH_LATENCY=30 SECONDS,MAX_EVENT_SIZE=0 KB,MEMORY_PARTITION_MODE=NONE,TRACK_CAUSALITY=OFF,STARTUP_STATE=OFF)
GO

在 SSMS 中，当我view live data然后执行xml查询和视图时，没有返回任何结果。

我所看到的是：

在看到结果之前，我还需要完成其他步骤吗？

我跟着：

http://www.mssqltips.com/sqlservertip/2731/managing-sql-server-extended-events-in-management-studio/

http://www.sqlskills.com/blogs/bobb/choosing-paths-for-selective-xml-index-part-2-using-the-sxi-xevents/

http://www.sqlskills.com/blogs/jonathan/sql-server-2012-extended-events-update-3-viewing-target-data/

编辑，

添加请求的查询和索引

询问

WITH XMLNAMESPACES ( 'http://tempuri.org/tst.xsd' as tst )

SELECT 

    x.XmlId

    ,a.value('@id', 'int') As ColumnA
    ,b.value('.', 'NVARCHAR(25)') ColumnB               

        From
    dbo.XmlTable As X

    Cross Apply x.XmlContent.nodes('tst:Root/tst:Stuff') aa(a)
    Cross Apply a.nodes('tst:Forms') bb(b) 

以及根元素和属性的索引

CREATE SELECTIVE XML INDEX [xsi_XmlTable] …