Strange Behavior with SQL/XML

Our University have had for quite some time now a rather difficult situation with a very significant course handbook web site that creates HTML based on database XSL transformation of XML content generated with SQL/XML. The database is 10.2.0.2.0. The HTML is passed via a distributed database link to an Oracle Portal dynamic portlet for display. Some of the derived XML originates from XML Schema registered instance documents and some from relational storage.
Let me explain. Occasionally after a period of operating (could be one week, sometimes even less) we will experience a problem whereby our derived XML content (just prior to PL/SQL database XSL transformation) will develop a parsing problem. Once this happens to one XSL transform of a course then subsequently it happens for every course viewed/transformed there-after.
Recently I experienced the problem and then added the XMLNS argument to the extract function. That seemed to fix things and I thought I had it licked.
Today we started to get the same problem again. The error reported was:
ORA-31011: XML parsing failed
ORA-19202: Error occurred in XML processing
LPX-00242: invalid use of ampersand ('&') character (use &)
Error at line 1
Now this might have been reasonable for one course. But every course reported the same problem there-after without fail. I managed to fix the issue but in a way that really doesn't seem to make sense. What I did was to alter the SQL/XML statement by adding in an extra XMLEMENT and then to recompile the function that returns an XMLTYPE based on the execution of the SQL statement. After compiling the function everything returned to normal.
This doesn't seem to make sense.
I am pretty desperate for help on this. I really don't know how to progress the solution. I don't get much joy from Oracle Support as our application covers too many high tech areas. This is really shaking confidence in our organization's use of Oracle technology.

Hi Mark.
We've isolated the problem a bit more now and there is a support SR (6089662.994). At this stage we are unable to reproduce - I am testing out an export though. The problem only occurs when a certain condition has been reached. Once that happens then extraneous characters are produced in the XMLTYPE feed returned by a function. We are not at all sure about how to make this condition occur. This doesn't just happen with one SQL/XML cursor - I've seen it happen with 3 different cursors. All are located in the same function that returns an XMLTYPE.
We are convinced the problem lies with one or more SQL/XML cursors located in the same function. Once one of these cursors malfunctions it will produce XML that is not well formed OR on occasion has content omitted but is well formed (there often seem to be extraneous characters). When the XML content is not well formed then the parsing stage (dbms_xmlparser.parseclob(myparser, xml_clob)) of XSL transformation crashes. This error then propagates to the dynamic portlet in Oracle Portal thus removing the content on the page. This happens for every execution of the cursor while the condition manifests, the only difference between calls being bind variables.
The interesting thing is that the error if left to itself will eventually stop. The cursor seems to right itself eventually. On the last occurrence, the problem commenced at 4.30am and went for 3.5 hrs and then seemed to right itself.

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-- and add this new Emp element to the Employees node
l_emp_element := dbms_xmldom.createElement(l_domdoc, 'Emp' );
dbms_xmldom.setAttribute(l_emp_element, 'empid', r_emp.employee_id );
l_emp_node := dbms_xmldom.appendChild( l_employees_node
, dbms_xmldom.makeNode(l_emp_element)
-- Each emp node will get a First name and Last name node which contains the first name and last name as text
l_emp_first_name_node := dbms_xmldom.appendChild( l_emp_node
, dbms_xmldom.makeNode(dbms_xmldom.createElement(l_domdoc, 'FirstName' ))
l_emp_first_name_textnode := dbms_xmldom.appendChild( l_emp_first_name_node
, dbms_xmldom.makeNode(dbms_xmldom.createTextNode(l_domdoc, r_emp.first_name ))
l_emp_last_name_node := dbms_xmldom.appendChild( l_emp_node
, dbms_xmldom.makeNode(dbms_xmldom.createElement(l_domdoc, 'LastName' ))
l_emp_last_name_textnode := dbms_xmldom.appendChild( l_emp_last_name_node
, dbms_xmldom.makeNode(dbms_xmldom.createTextNode(l_domdoc, r_emp.last_name ))
END LOOP;
END LOOP;
l_xmltype := dbms_xmldom.getXmlType(l_domdoc);
dbms_xmldom.freeDocument(l_domdoc);
dbms_output.put_line(l_xmltype.getClobVal);
END;
thanks and regards,
Arun Thomas T

It's as easy as this :
SQL> select xmlserialize(document
2           xmlelement("Departments"
3           , xmlagg(
4               xmlelement("Dept"
5               , xmlattributes(d.department_id as "Deptno")
6               , xmlforest(
7                   d.department_name as "Name"
8                 , l.city as "Location"
9                 )
10               , xmlelement("Employees"
11                 , (
12                     select xmlagg(
13                              xmlelement("Emp"
14                              , xmlattributes(e.employee_id as "empid")
15                              , xmlforest(
16                                  e.first_name as "FirstName"
17                                , e.last_name as "LastName"
18                                )
19                              )
20                            )
21                     from hr.employees e
22                     where e.department_id = d.department_id
23                   )
24                 )
25               )
26             )
27           )
28           indent
29         )
30 from hr.departments d
31       join hr.locations l on l.location_id = d.location_id
32 where d.department_id in (10,20) ;
XMLSERIALIZE(DOCUMENTXMLELEMEN
<Departments>
<Dept Deptno="10">
    <Name>Administration</Name>
    <Location>Seattle</Location>
    <Employees>
      <Emp empid="200">
        <FirstName>Jennifer</FirstName>
        <LastName>Whalen</LastName>
      </Emp>
    </Employees>
</Dept>
<Dept Deptno="20">
    <Name>Marketing</Name>
    <Location>Toronto</Location>
    <Employees>
      <Emp empid="201">
        <FirstName>Michael</FirstName>
        <LastName>Hartstein</LastName>
      </Emp>
      <Emp empid="202">
        <FirstName>Pat</FirstName>
        <LastName>Fay</LastName>
      </Emp>
    </Employees>
</Dept>
</Departments>

Strange problem with SQL query in toad.

Guys,
My colleague is up with a strange problem with an SQL query that if it is run in toad encounters the "ORA-03113: end-of-file on communication channel" problem,but if run in SQL plus executes just fine.
Do anyone have thoughts about this strange error in toad?
Thanks!!!!
Regards,
Bhagat

Not sure what version of TOAD you have but it may have shipped with SQLMonitor which montiors SQL sent from Windows apps . Navigation should be similar to;
Start~Programs~Quest Software~TOAD for Oracle~Tools~SQLMonitor
or
C:\Program Files\Quest Software\Toad for Oracle\SQLMonitor.exe
To use it, start TOAD and connect, start SQLMonitor and click the checkbox for TOAD.exe, then execute the query. SQLMonitor will show you the actual query that TOAD sent to the client. It may be exactly what you sent or it may contain some extras.

Strange behavior with NI 9401

Hi everyone!
I think I have a strange problem with the NI 9401 modules.
My hardware is a CompactRIO and I'm using Labview 8.0.
I'm reading a 13 bit encoder with two NI 9401 modules: the first for 8 input channels and the second for the other remaining 5. input channels.
13 bits means that the slots in the outest part of the counter are 8192 so i expect my encoder to count up/down till 8192. What instead happens is that the counter goes up to 7934, then suddenly to 7860, then from 0 to 254 and then finally to 0 again and up again to 7934 and the story always goes on like this. I put the true/false outputs of the encoder in a boolean array and then, from the boolean array to a number. (see the attacched VI)
Here's how I devided the inputs between the two modules
-NI 9401 2 :
DIO0= 2^0
DIO1= 2^1
DIO2= 2^2
DIO3= 2^3
DIO4= 2^4
DIO5= 2^5
DIO6= 2^6
DIO7= 2^7
- NI 9401
DIO0= 2^8
DIO1= 2^9
DIO2= 2^10
DIO3= 2^11
DIO4= 2^12
When running the VI I suddenly realized that every time all the input for each modules should be true ( i.e. five leds on for the second module or eight leds on for the first) , the value of all the inputs goes immediately to 0 i.e. all the leds switch off . To make an example: I see 4 leds on for the second module but when comes the time of the fifth, all the leds switch off so it means all the inputs are false which i can't understand. I tried to change the pin assignments in order to read the same inputs from different pins and this did'nt change anything. I tried to use only 4 inputs for the second module and this didn't work. Every time all the inputs for each module should be true it goes up to (n-1) inputs true and the n inputs zero. More information about this strange behaviour: while a normal false input produces a voltage of 0.036 V the voltage I measured from the last pin that should be true and that should give me all the leds on for one module, produces instead -0.146 V.
This is everything I tried in order to solve this problem but now I'm at a dead end.
Could it be a kind of module setting which I didn't consider?
Due to all the attempts I've made I excluded any disfunction of the encoder so I focused my attention to the modules.
Does anyone of you have any idea?
Thanks!!
Rob_F
Attachments:
Prova_encoder2.lvproj ‏14 KB
Prova_encoder2.vi ‏155 KB

Thanks a lot JMota!
We just sent back the encoder to the company who sells them. They want to be sure it's not a product defect or, even worse, a problem of conflict with the NI 9401.
In the meanwhile we built up the acquisition VI for the accelerometer and the encoder. One while loop sends the accelerometer data to a DMA FIFO and another parallel while loop is used to read the encoder outputs and send these data to another DMA FIFO. I did this because I know only 1 DMA FIFO can be used for each channel. When I read the data with two FIFO.read with two parallel loops in the Real-Time I discovered that I can't make them work indipendently as i thought i.e. reading settings of one FIFO.read ( number of elements and loop timing) affects also the other FIFO.read .
Any explanation for this behavior?
Thanks again JMota!

Strange behavior with Firefox

Hi Team,
I am using HTMLDB V2.0 and Firefox V1.5.0.1. I used wizard to create a report/form application. However, when I press a button to update the form all the buttons line up in a vertical row and I then have to press the same button again.
My application is 30412 at htmldb.oracle.com. The problem is occurring at page 4. Go to page 3 (2nd tab) and select any record. You will be directed to page 4. Then when you press any button (cancel, create, delete, apply changes) on page 4, page 4 is refreshed and the buttons strangely line up in a vertical column. I then have to press the same button again before the update occurs.
I have the same report/form setup on pages 1 and 2 and it is working fine on those pages.
This strange behavior is not occurring in IE. I also notice that the font size is bigger in IE .
I would appreciate any help you might offer.
I really enjoy working with HTMLDB.
Thanks, Andy

Sorry about that. I removed all the authorization schemes from the application. I also changed the authentication scheme to HTMLDB. Let me know if I need to do something more for you to get access.
Thanks for looking at it.
I think it may have something to do with the "button, alternative 3" template from theme 3 that I am using. When I switch to the "button" template from theme 3 then the strange behavior goes away in Firefox.
Andy

Strange behavior with obssocookie on different browser

Hi,
I am trying to integrate OAM with our application deployed on WLS. I have set up an IIS proxy server and installed a web gate on it. I have seen a couple of strange behavior
1) If I try to access some static image file, SSO keeps asking for authentication. It happens for both firefox and IE, but it doesn't happen for chrome though. Looks like for image file request, the obssocookie is not passed correctly. Anyone sees that before?
2) If I use firefox on the machine where WLS app server is installed to connect to proxy server, if I use hostname in the URL, I don't see the obssocookie. If I use IP address in the URL, I can see obssocookie. If I use IE or any browser from any other machine, obssocookie is always available
thanks.
-Wei

I found it in the document
B.1 How Logout Works
The WebGate logs a user out when it receives a URL containing "logout." (including the "."), with the exceptions of logout.gif and logout.jpg, for example, logout.html or logout.pl. When the WebGate receives a URL with this string, the value of the ObSSOCookie is set to "logout."
The Access System sets an obSSOCookie for each user or application that accesses a resource protected by a WebGate. The obSSOCookie enables users to access resources that are protected by the Access System that have the same or a lower authentication level. Removing the ObSSOcookie causes the WebGate to log the user out and requires the user to re-authenticate the next time he or she requests a resource that is protected by the Access System.
Well, I havn't got that far in the document:)
Thanks a lot for your help.
-Wei

Strange Behavior with SQL/XML

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