Fastest way to extract data out of xml with following constraints.

10.2 on linux
xml files are being dropped off into a queue. in the queue the documents must be stored as clobs so that control can be given back to the client as soon as possible.
once in the queue we would like to extract all the data from the xml and place it in relational staging tables. the data is then moved from these tables into production.
the only thing that can change is what happens between the queue and the staging tables. currently i am just using extract statements to pull the data out of the clob.
the files are around 20mb and currently take over 20 minutes to process which is way too long.
i looked at DBMS_XMLSTORE but we cannot alter the xml format.
i looked at Oracle text but if i understand it correctly, we would have to rebuild the entire index after every new queue item.
i have very little experience with xml so i want to make sure i know all my options.
from what i can tell my only option is to take the clob and let xml db parse it into o-r tables. ...but even that seems like a horrible waste.
is there anything else i can do? any pointers?
thanks for any help!
by the way...this forum has been of great help. my only problem is that i don't seem to ask the right questions at the right time.

Chris
Most people seem to find that allow XML DB to persist the XML using the object based storage and nested tables and then using insert as select operations is the most effective way to do what you want. There are a number of threads on how to best do this..
The question to ask is do you really need the relational staging tables. If you read through the forum you'll see that once the XML has been persisted as objects, and the XML objects have been stored using a nested table storage models you can easily create relational views to represent the staging tables.
This process will work very well if there are no updates to the staging tables. Effectively you will process the XML once, when you insert into the Schema based tables, and then use the relational views as the source for the migration from staging to production.
If you haven't already done so, reading the following posts will help you with this
XMLType column based on XML Schema: several questions
http://forums.oracle.com/forums/thread.jspa?threadID=347820&tstart=0
problem with sql/xml
XML Query Performance on Nested Tables
Basically you'll need an XML Schema that describes your XML and you'll need to set up nested table storage for each of the collections in your XML Schema in order to the required performance when using the views.
The easiest way will be to use the default table that is creted when registering the XML Schema and the annotation xdb:storeVarrayAsTable="true" and then ensure that you sequence each collection correctly.

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Edited by: airchtit on Jan 22, 2008 6:02 AM

paul.miner wrote:
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I

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     at com.sunopsis.sql.SnpsConnection.testConnection(SnpsConnection.java:1100)
     at com.sunopsis.graphical.dialog.SnpsDialogTestConnet.getLocalConnect(SnpsDialogTestConnet.java:371)
     at com.sunopsis.graphical.dialog.SnpsDialogTestConnet.localConnect(SnpsDialogTestConnet.java:794)
     at com.sunopsis.graphical.dialog.SnpsDialogTestConnet.jButtonTest_ActionPerformed(SnpsDialogTestConnet.java:754)
     at com.sunopsis.graphical.dialog.SnpsDialogTestConnet.connEtoC1(SnpsDialogTestConnet.java:137)
     at com.sunopsis.graphical.dialog.SnpsDialogTestConnet.access$1(SnpsDialogTestConnet.java:133)
     at com.sunopsis.graphical.dialog.SnpsDialogTestConnet$IvjEventHandler.actionPerformed(SnpsDialogTestConnet.java:87)
     at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
     at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
     at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
     at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
     at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
     at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:272)
     at java.awt.Component.processMouseEvent(Component.java:6289)
     at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
     at java.awt.Component.processEvent(Component.java:6054)
     at java.awt.Container.processEvent(Container.java:2041)
     at java.awt.Component.dispatchEventImpl(Component.java:4652)
     at java.awt.Container.dispatchEventImpl(Container.java:2099)
     at java.awt.Component.dispatchEvent(Component.java:4482)
     at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4577)
     at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4238)
     at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168)
     at java.awt.Container.dispatchEventImpl(Container.java:2085)
     at java.awt.Window.dispatchEventImpl(Window.java:2478)
     at java.awt.Component.dispatchEvent(Component.java:4482)
     at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:644)
     at java.awt.EventQueue.access$000(EventQueue.java:85)
     at java.awt.EventQueue$1.run(EventQueue.java:603)
     at java.awt.EventQueue$1.run(EventQueue.java:601)
     at java.security.AccessController.doPrivileged(Native Method)
     at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
     at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98)
     at java.awt.EventQueue$2.run(EventQueue.java:617)
     at java.awt.EventQueue$2.run(EventQueue.java:615)
     at java.security.AccessController.doPrivileged(Native Method)
     at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
     at java.awt.EventQueue.dispatchEvent(EventQueue.java:614)
     at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
     at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
     at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
     at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
     at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
Caused by: java.sql.SQLException: The model generated by the model mapper was not accepted by a validator: Model not accepted: Namespace not found:
     at com.sunopsis.jdbc.driver.xml.SnpsXmlDTD.initialize(SnpsXmlDTD.java:389)
     at com.sunopsis.jdbc.driver.xml.SnpsXmlDTD.initialize(SnpsXmlDTD.java:421)
     at com.sunopsis.jdbc.driver.xml.SnpsXmlDTD.<init>(SnpsXmlDTD.java:150)
     at com.sunopsis.jdbc.driver.xml.SnpsXmlSchema.<init>(SnpsXmlSchema.java:478)
     at com.sunopsis.jdbc.driver.xml.SnpsXmlSchemaManager.createNewSchema(SnpsXmlSchemaManager.java:292)
     at com.sunopsis.jdbc.driver.xml.SnpsXmlSchemaManager.getSchemaFromProperties(SnpsXmlSchemaManager.java:270)
     at com.sunopsis.jdbc.driver.xml.SnpsXmlDriver.connect(SnpsXmlDriver.java:114)
     at oracle.odi.jdbc.datasource.DriverManagerUtils$DriverProxy.connect(DriverManagerUtils.java:23)
     at oracle.odi.jdbc.datasource.DriverManagerDataSource.getConnectionFromDriverManager(DriverManagerDataSource.java:368)
     at oracle.odi.jdbc.datasource.DriverManagerDataSource.getConnectionFromDriverManager(DriverManagerDataSource.java:352)
     at oracle.odi.jdbc.datasource.DriverManagerDataSource.getConnectionFromDriverManager(DriverManagerDataSource.java:316)
     at oracle.odi.jdbc.datasource.DriverManagerDataSource.getConnection(DriverManagerDataSource.java:275)
     at oracle.odi.jdbc.datasource.LoginTimeoutDatasourceAdapter.doGetConnection(LoginTimeoutDatasourceAdapter.java:99)
     at oracle.odi.jdbc.datasource.LoginTimeoutDatasourceAdapter.getConnection(LoginTimeoutDatasourceAdapter.java:62)
     at oracle.odi.jdbc.datasource.LoginTimeoutDatasourceAdapter$ConnectionProcessor.run(LoginTimeoutDatasourceAdapter.java:217)
     at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
     at java.util.concurrent.FutureTask.run(FutureTask.java:138)
     at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
     at java.lang.Thread.run(Thread.java:662)

Hi,
Thans for your reply.
This is the DTD for my xmldoc.
<!ELEMENT Data (Department+)>
<!ELEMENT EmployeeID (#PCDATA)>
<!ATTLIST EmployeeID col (EMPID) #IMPLIED>
<!ELEMENT Education (EmployeeID, Sequence, Dgree)>
<!ATTLIST Education table NMTOKEN #IMPLIED>
<!ELEMENT Employee (EmployeeName, EmployeeID, DepartmentID, Education*)>
<!ATTLIST Employee table NMTOKEN #IMPLIED>
<!ELEMENT EmployeeName (#PCDATA)>
<!ATTLIST EmployeeName col NMTOKEN #IMPLIED>
<!ELEMENT DepartName (#PCDATA)>
<!ATTLIST DepartName col NMTOKEN #IMPLIED>
<!ELEMENT Table (Column+)>
<!ATTLIST Table importType NMTOKEN #IMPLIED>
<!ATTLIST Table parentTable NMTOKEN #IMPLIED>
<!ATTLIST Table tag NMTOKEN #IMPLIED>
<!ATTLIST Table columns NMTOKEN #IMPLIED>
<!ATTLIST Table name NMTOKEN #IMPLIED>
<!ELEMENT DepartID (#PCDATA)>
<!ATTLIST DepartID col NMTOKEN #IMPLIED>
<!ELEMENT MetaData (Table+)>
<!ELEMENT Sequence (#PCDATA)>
<!ATTLIST Sequence col NMTOKEN #IMPLIED>
<!ELEMENT Dgree (#PCDATA)>
<!ATTLIST Dgree col NMTOKEN #IMPLIED>
<!ELEMENT Export (MetaData, Data)>
<!ELEMENT DepartmentID (#PCDATA)>
<!ATTLIST DepartmentID col NMTOKEN #IMPLIED>
<!ELEMENT Column (#PCDATA)>
<!ATTLIST Column deleteKey NMTOKEN #IMPLIED>
<!ATTLIST Column isKey NMTOKEN #IMPLIED>
<!ELEMENT Department (DepartName, DepartID, Employee+)>
<!ATTLIST Department table NMTOKEN #IMPLIED>
Thanks again!
Yan

Fastest way to extract data out of xml with following constraints.

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