Index within timestamp column of XML datatype

Question

Team , Thanks for your help in advance !
I'm looking out for some suggestions about creating indexes within XML datatype , Preferably a timestamp . Pasted below sample xml data ..I'm googling it in the interim while some one help me here .
<RingBufferTarget truncated="0" processingTime="0" totalEventsProcessed="2" eventCount="2" droppedCount="0" memoryUsed="1054">
<event name="object_created" package="sqlserver" timestamp="2015-03-09T08:20:17.550Z">
<data name="database_id">
<type name="uint32" package="package0" />
<value>41</value>
</data>
<data name="object_id">
<type name="int32" package="package0" />
<value>933578364</value>
</data>
<data name="object_type">
<type name="object_type" package="sqlserver" />
<value>8277</value>
<text>USRTAB</text>
</data>
<data name="index_id">
<type name="uint32" package="package0" />
<value>0</value>
</data>
<data name="related_object_id">
<type name="int32" package="package0" />
<value>0</value>
</data>
<data name="ddl_phase">
<type name="ddl_opcode" package="sqlserver" />
<value>0</value>
<text>Begin</text>
</data>
<data name="transaction_id">
<type name="int64" package="package0" />
<value>284364642</value>
</data>
<data name="object_name">
<type name="unicode_string" package="package0" />
<value>DUMMY</value>
</data>
<data name="database_name">
<type name="unicode_string" package="package0" />
<value />
</data>
<action name="cpu_id" package="sqlos">
<type name="uint32" package="package0" />
<value>0</value>
</action>
<action name="task_time" package="sqlos">
<type name="uint64" package="package0" />
<value>14322587</value>
</action>
<action name="client_app_name" package="sqlserver">
<type name="unicode_string" package="package0" />
<value>Microsoft SQL Server Management Studio - Query</value>
</action>
<action name="client_hostname" package="sqlserver">
<type name="unicode_string" package="package0" />
<value>VDDBARY</value>
</action>
<action name="database_name" package="sqlserver">
<type name="unicode_string" package="package0" />
<value>TEST_R_D</value>
</action>
<action name="nt_username" package="sqlserver">
<type name="unicode_string" package="package0" />
<value />
</action>
<action name="server_instance_name" package="sqlserver">
<type name="unicode_string" package="package0" />
<value>SQLDEV01</value>
</action>
<action name="server_principal_name" package="sqlserver">
<type name="unicode_string" package="package0" />
<value>ryelug01</value>
</action>
<action name="session_id" package="sqlserver">
<type name="uint16" package="package0" />
<value>99</value>
</action>
<action name="session_nt_username" package="sqlserver">
<type name="unicode_string" package="package0" />
<value />
</action>
<action name="session_resource_group_id" package="sqlserver">
<type name="uint32" package="package0" />
<value>2</value>
</action>
<action name="sql_text" package="sqlserver">
<type name="unicode_string" package="package0" />
<value>USE TEST_R_d
CREATE TABLE DUMMY
id int not null
)</value>
</action>
<action name="username" package="sqlserver">
<type name="unicode_string" package="package0" />
<value>ryelug01</value>
</action>
</event>
<event name="object_created" package="sqlserver" timestamp="2015-03-09T08:20:17.552Z">
<data name="database_id">
<type name="uint32" package="package0" />
<value>41</value>
</data>
<data name="object_id">
<type name="int32" package="package0" />
<value>933578364</value>
</data>
<data name="object_type">
<type name="object_type" package="sqlserver" />
<value>8277</value>
<text>USRTAB</text>
</data>
<data name="index_id">
<type name="uint32" package="package0" />
<value>0</value>
</data>
<data name="related_object_id">
<type name="int32" package="package0" />
<value>0</value>
</data>
<data name="ddl_phase">
<type name="ddl_opcode" package="sqlserver" />
<value>1</value>
<text>Commit</text>
</data>
<data name="transaction_id">
<type name="int64" package="package0" />
<value>284364642</value>
</data>
<data name="object_name">
<type name="unicode_string" package="package0" />
<value>DUMMY</value>
</data>
<data name="database_name">
<type name="unicode_string" package="package0" />
<value />
</data>
<action name="cpu_id" package="sqlos">
<type name="uint32" package="package0" />
<value>0</value>
</action>
<action name="task_time" package="sqlos">
<type name="uint64" package="package0" />
<value>14322583</value>
</action>
<action name="client_app_name" package="sqlserver">
<type name="unicode_string" package="package0" />
<value>Microsoft SQL Server Management Studio - Query</value>
</action>
<action name="client_hostname" package="sqlserver">
<type name="unicode_string" package="package0" />
<value>VDDBARY</value>
</action>
<action name="database_name" package="sqlserver">
<type name="unicode_string" package="package0" />
<value>TEST_R_D</value>
</action>
<action name="nt_username" package="sqlserver">
<type name="unicode_string" package="package0" />
<value />
</action>
<action name="server_instance_name" package="sqlserver">
<type name="unicode_string" package="package0" />
<value>SQLDEV01</value>
</action>
<action name="server_principal_name" package="sqlserver">
<type name="unicode_string" package="package0" />
<value>ryelug01</value>
</action>
<action name="session_id" package="sqlserver">
<type name="uint16" package="package0" />
<value>99</value>
</action>
<action name="session_nt_username" package="sqlserver">
<type name="unicode_string" package="package0" />
<value />
</action>
<action name="session_resource_group_id" package="sqlserver">
<type name="uint32" package="package0" />
<value>2</value>
</action>
<action name="sql_text" package="sqlserver">
<type name="unicode_string" package="package0" />
<value>USE TEST_R_d
CREATE TABLE DUMMY
id int not null
)</value>
</action>
<action name="username" package="sqlserver">
<type name="unicode_string" package="package0" />
<value>ryelug01</value>
</action>
</event>
</RingBufferTarget>
Rajkumar Yelugu

Answer 1

Thanks for the link Visakh !
It helps me getting  started , I applied few tips on to my ongoing stored proc ( Below ) but not a great improvement though  , Thanks for your further assistance .
CREATE TABLE #XML_Hold
ID INT NOT NULL IDENTITY(1,1) PRIMARY KEY , -- PK necessity for Indexing on XML Col
BufferXml XML
INSERT INTO #XML_Hold (BufferXml)
SELECT
CAST(target_data AS XML) AS TargetData --BufferXml
FROM sys.dm_xe_session_targets xet
INNER JOIN sys.dm_xe_sessions xes
ON xes.address = xet.event_session_address
WHERE xes.name = 'Capture DDL Schema Changes'
--RETURN
SELECT GETDATE() AS GETDATE_1
CREATE PRIMARY XML INDEX [IX_XML_Hold] ON #XML_Hold(BufferXml) -- Ryelugu 03/09/2015 - Primary Index
SELECT GETDATE() AS GETDATE_2
--create secondary xml value index
CREATE XML INDEX [IX_XML_Hold_values] ON #XML_Hold(BufferXml)
USING XML INDEX [IX_XML_Hold]
FOR VALUE
SELECT GETDATE() AS GETDATE_3
SELECT
p.q.value('@name[1]','varchar(100)') AS eventname,
p.q.value('@timestamp[1]','datetime') AS timestampvalue,
p.q.value('(./data[@name="object_name"]/value)[1]','varchar(100)') AS objectname,
p.q.value('(./data[@name="object_type"]/text)[1]','varchar(100)') AS ObjectType,
p.q.value('(./action[@name="database_name"]/value)[1]','varchar(100)') AS databasename,
p.q.value('(./data[@name="ddl_phase"]/text)[1]','varchar(100)') AS ddl_phase,
p.q.value('(./action[@name="client_app_name"]/value)[1]','varchar(100)') AS clientappname,
p.q.value('(./action[@name="client_hostname"]/value)[1]','varchar(100)') AS clienthostname,
p.q.value('(./action[@name="server_instance_name"]/value)[1]','varchar(100)') AS server_instance_name,
p.q.value('(./action[@name="nt_username"]/value)[1]','varchar(100)') AS nt_username,
p.q.value('(./action[@name="server_principal_name"]/value)[1]','varchar(100)') AS serverprincipalname,
p.q.value('(./action[@name="sql_text"]/value)[1]','Nvarchar(max)') AS sqltext
FROM #XML_Hold
CROSS APPLY BufferXml.nodes('/RingBufferTarget/event')p(q)
WHERE -- Ryelugu 03/05/2015 -
p.q.value('@timestamp[1]','datetime') >= ISNULL(@Prev_Insertion_time ,p.q.value('@timestamp[1]','datetime'))
AND p.q.value('(./data[@name="ddl_phase"]/text)[1]','varchar(100)') ='Commit'
AND p.q.value('(./data[@name="object_type"]/text)[1]','varchar(100)') <> 'STATISTICS'
AND p.q.value('(./data[@name="object_name"]/value)[1]','varchar(100)') NOT LIKE '%#%'
It appears that filtering  and selecting from #XML_Hold  is TIME taking .
Rajkumar Yelugu