Big XML Problem

Hello,
I am using an ObjectOutputStream to write and XML file to a disk, however this causes me problems as it inserts some header characters to the begining of the file which it writes. These extra characters prevent my SAX parser from correctly reading the file. When I manually open up the file and remote the characters in notepad the problem is solved, how can I save XML files without the extra 'hearer' characters??
Please help, I've been stuck on this problem for hours!

How can you use ObjectOutputStream to write XML?
ObjectOutputStream mandates using the object stream format of its own. You can customize the serialization process by implementing readObject and writeObject but you can't change the overall format (headers etc) specified in http://java.sun.com/j2se/1.4.2/docs/guide/serialization/spec/serialTOC.html
Maybe you could look into using XMLEncoder and XMLDecoder? http://java.sun.com/j2se/1.4.2/docs/api/java/beans/XMLEncoder.html

Similar Messages

Loading big XML files using JDBC gives errors

Hi,
I've created a XMLType table using binary storage, with the restriction that any document stored has a (any) schema:
CREATE TABLE XMLBIN OF XMLTYPE
XMLTYPE STORE AS BINARY XML
ALLOW ANYSCHEMA;Then I use JDBC to store a relatively large document using the following code:
Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();
String connectionString = "jdbc:oracle:thin:@host:1521:sid";
File f = new File("c:\\temp\\big.xml");
Connection conn = DriverManager.getConnection(connectionString, "username", "password");
XMLType xml = XMLType.createXML(conn,new FileInputStream(f));
String statementText = "INSERT INTO xmlbin VALUES (?)";
OracleResultSet resultSet = null;
OracleCallableStatement statement = (OracleCallableStatement)conn.prepareCall(statementText);
statement.setObject(1,xml);
statement.execute();
statement.close();
conn.commit();
conn.close();Loading a file of 61Mb (real Mb, in non-IT Mb (where 1Mb seems to be 10^6) it is 63.9Mb) or less doesn't give any errors, loading a file bigger then that gives the following error:
java.sql.SQLRecoverableException: Io exception: Software caused connection abort: socket write error
        at oracle.jdbc.driver.SQLStateMapping.newSQLException(SQLStateMapping.java:101)
        at oracle.jdbc.driver.DatabaseError.newSQLException(DatabaseError.java:112)
        at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:173)
        at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:229)
        at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:458)
        at oracle.jdbc.driver.T4CCallableStatement.executeForRows(T4CCallableStatement.java:960)
        at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1222)
        at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3381)
        at oracle.jdbc.driver.OraclePreparedStatement.execute(OraclePreparedStatement.java:3482)
        at oracle.jdbc.driver.OracleCallableStatement.execute(OracleCallableStatement.java:3856)
        at oracle.jdbc.driver.OraclePreparedStatementWrapper.execute(OraclePreparedStatementWrapper.java:1373)
        at jdbctest.Tester.main(Tester.java:60)A succesful insert of a 63Mb file takes about 23 seconds to execute. The 70Mb file fails already after a few seconds, so I'm ruling out any time outs.
I'm guessing there are some buffers that need to be enlarged, but don't have a clue which ones.
Anyone any idea what might cause the problem and how to resolve?
My server runs Oracle 11g Win32. The client is Windows running Sun Java 1.6, using ojdbc6.jar and Oracle 11g Client installed.
Cheers,
Harald

Hi Mark,
The trace log in the OEM shows me:
Errors in file d:\oracle11g\app\helium\diag\rdbms\helium\helium\trace\helium_ora_6948.trc (incident=7510): ORA-07445: exception encountered: core dump [__intel_new_memcpy()+613] [ACCESS_VIOLATION] [ADDR:0x0] [PC:0x6104B045] [UNABLE_TO_WRITE] [] If needed I can post the full contents (if I find out how, am still a novice :-))
Cheers,
Harald

Slow extraction in big XML-Files with PL/SQL

Hello,
i have a performance problem with the extraction from attributes in big XML Files. I tested with a size of ~ 30 mb.
The XML file is a response of a webservice. This response include some metadata of a document and the document itself. The document is inline embedded with a Base64 conversion. Here is an example of a XML File i want to analyse:
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
   <soap:Body>
      <ns2:GetDocumentByIDResponse xmlns:ns2="***">
         <ArchivedDocument>
            <ArchivedDocumentDescription version="1" currentVersion="true" documentClassName="Allgemeines Dokument" csbDocumentID="***">
               <Metadata archiveDate="2013-08-01+02:00" documentID="123">
                  <Descriptor type="Integer" name="fachlicheId">
                     <Value>123<Value>
                  </Descriptor>
                  <Descriptor type="String" name="user">
                     <Value>***</Value>
                  </Descriptor>
                  <InternalDescriptor type="Date" ID="DocumentDate">
                     <Value>2013-08-01+02:00</Value>
                  </InternalDescriptor>
                  
               </Metadata>
               <RepresentationDescription default="true" description="Description" documentPartCount="1" mimeType="application/octet-stream">
                  <DocumentPartDescription fileName="20mb.test" mimeType="application/octet-stream" length="20971520 " documentPartNumber="0" hashValue=""/>
               </RepresentationDescription>
            </ArchivedDocumentDescription>
            <DocumentPart mimeType="application/octet-stream" length="20971520 " documentPartNumber="0" representationNumber="0">
               <Data fileName="20mb.test">
                  <BinaryData>
                    
                  </BinaryData>
               </Data>
            </DocumentPart>
         </ArchivedDocument>
      </ns2:GetDocumentByIDResponse>
   </soap:Body>
</soap:Envelope>
Now i want to extract the filename and the Base64 converted document from this XML response.
For the extraction of the filename i use the following command:
v_filename := apex_web_service.parse_xml(v_xml, '//ArchivedDocument/ArchivedDocumentDescription/RepresentationDescription/DocumentPartDescription/@fileName');
For the extraction of the binary data i use the following command:
v_clob := apex_web_service.parse_xml_clob(v_xml, '//ArchivedDocument/DocumentPart/Data/BinaryData/text()');
My problem is the performance of this extraction. Here i created some summary of the start and end time for the commands:
Start Time
End Time
Difference
Command
10.09.13 - 15:46:11,402668000
10.09.13 - 15:47:21,407895000
00:01:10,005227
v_filename_bcm := apex_web_service.parse_xml(v_xml, '//ArchivedDocument/ArchivedDocumentDescription/RepresentationDescription/DocumentPartDescription/@fileName');
10.09.13 - 15:47:21,407895000
10.09.13 - 15:47:22,336786000
00:00:00,928891
v_clob := apex_web_service.parse_xml_clob(v_xml, '//ArchivedDocument/DocumentPart/Data/BinaryData/text()');
As you can see the extraction of the filename is slower then the document extraction. For the Extraction of the filename i need ~01
I wonder about it and started some tests.
I tried to use an exact - non dynamic - filename. So i have this commands:
v_filename := '20mb_1.test';
v_clob := apex_web_service.parse_xml_clob(v_xml, '//ArchivedDocument/DocumentPart/Data/BinaryData/text()');
Under this Conditions the time for the document extraction soar. You can see this in the following table:
Start Time
End Time
Difference
Command
10.09.13 - 16:02:33,212035000
10.09.13 - 16:02:33,212542000
00:00:00,000507
v_filename_bcm := '20mb_1.test';
10.09.13 - 16:02:33,212542000
10.09.13 - 16:03:40,342396000
00:01:07,129854
v_clob := apex_web_service.parse_xml_clob(v_xml, '//ArchivedDocument/DocumentPart/Data/BinaryData/text()');
So i'm looking for a faster extraction out of the xml file. Do you have any ideas? If you need more informations, please ask me.
Thank you,
Matthias
PS: I use the Oracle 11.2.0.2.0

Although using an XML schema is a good advice for an XML-centric application, I think it's a little overkill in this situation.
Here are two approaches you can test :
Using the DOM interface over your XMLType variable, for example :
DECLARE
v_xml    xmltype := xmltype('<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
       <soap:Body>
          <ns2:GetDocumentByIDResponse xmlns:ns2="***">
             <ArchivedDocument>
                <ArchivedDocumentDescription version="1" currentVersion="true" documentClassName="Allgemeines Dokument" csbDocumentID="***">
                   <Metadata archiveDate="2013-08-01+02:00" documentID="123">
                      <Descriptor type="Integer" name="fachlicheId">
                         <Value>123</Value>
                      </Descriptor>
                      <Descriptor type="String" name="user">
                         <Value>***</Value>
                      </Descriptor>
                      <InternalDescriptor type="Date" ID="DocumentDate">
                         <Value>2013-08-01+02:00</Value>
                      </InternalDescriptor>
                      
                   </Metadata>
                   <RepresentationDescription default="true" description="Description" documentPartCount="1" mimeType="application/octet-stream">
                      <DocumentPartDescription fileName="20mb.test" mimeType="application/octet-stream" length="20971520 " documentPartNumber="0" hashValue=""/>
                   </RepresentationDescription>
                </ArchivedDocumentDescription>
                <DocumentPart mimeType="application/octet-stream" length="20971520 " documentPartNumber="0" representationNumber="0">
                   <Data fileName="20mb.test">
                      <BinaryData>
                        ABC123
                      </BinaryData>
                   </Data>
                </DocumentPart>
             </ArchivedDocument>
          </ns2:GetDocumentByIDResponse>
       </soap:Body>
    </soap:Envelope>');
domDoc    dbms_xmldom.DOMDocument;
docNode   dbms_xmldom.DOMNode;
node      dbms_xmldom.DOMNode;
nsmap     varchar2(2000) := 'xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ns2="***"';
xpath_pfx varchar2(2000) := '/soap:Envelope/soap:Body/ns2:GetDocumentByIDResponse/';
istream   sys.utl_characterinputstream;
buf       varchar2(32767);
numRead   pls_integer := 1;
filename       varchar2(30);
base64clob     clob;
BEGIN
domDoc := dbms_xmldom.newDOMDocument(v_xml);
docNode := dbms_xmldom.makeNode(domdoc);
filename := dbms_xslprocessor.valueOf(
                docNode
              , xpath_pfx || 'ArchivedDocument/ArchivedDocumentDescription/RepresentationDescription/DocumentPartDescription/@fileName'
              , nsmap
node := dbms_xslprocessor.selectSingleNode(
            docNode
          , xpath_pfx || 'ArchivedDocument/DocumentPart/Data/BinaryData/text()'
          , nsmap
--create an input stream to read the node content :
istream := dbms_xmldom.getNodeValueAsCharacterStream(node);
dbms_lob.createtemporary(base64clob, false);
-- read the content in 32k chunk and append data to the CLOB :
loop
    istream.read(buf, numRead);
    exit when numRead = 0;
    dbms_lob.writeappend(base64clob, numRead, buf);
end loop;
-- free resources :
istream.close();
dbms_xmldom.freeDocument(domDoc);
END;
Using a temporary XMLType storage (binary XML) :
create table tmp_xml of xmltype
xmltype store as securefile binary xml;
insert into tmp_xml values( v_xml );
select x.*
from tmp_xml t
   , xmltable(
       xmlnamespaces(
         'http://schemas.xmlsoap.org/soap/envelope/' as "soap"
       , '***' as "ns2"
     , '/soap:Envelope/soap:Body/ns2:GetDocumentByIDResponse/ArchivedDocument/DocumentPart/Data'
       passing t.object_value
       columns filename    varchar2(30) path '@fileName'
             , base64clob clob         path 'BinaryData'
     ) x

How to Canonicalize an Big XML?

Hello, i want to Canonicalize a big XML (like 1GB or more), the program it's in DOM, but dom can't manage big XML documents, so i was thinking to do it with STAX. How i can do it?
The Code (with dom) that i have it's:
File file=new File("big-1gb.xml");
org.apache.xml.security.Init.init();
DocumentBuilderFactory dfactory = DocumentBuilderFactory.newInstance();
DocumentBuilder documentBuilder = dfactory.newDocumentBuilder();
Document doc = documentBuilder.parse(file);
Canonicalizer c14n = Canonicalizer.getInstance("http://www.w3.org/TR/2001/REC-xml-c14n-20010315");
outputBytes = c14n.canonicalizeSubtree(doc.getElementsByTagName("SomeTag").item(0));
The idea it's do the code below with Stax...
Thx :)

yes i'm trying to create a XMLSignature :)
Well, i solve the problem, here is the solution:
XOM have an example that use low memory (see nu.xom.samples.MinimalNodeFactory in the source code of XOM), so, i use this code to canonicalize 200Mb XML file:
ByteArrayOutputStream bytestream = new ByteArrayOutputStream();
ObjectOutputStream outputstream = new ObjectOutputStream(bytestream);
nu.xom.Builder builder = new nu.xom.Builder(false, new nu.xom.samples.MinimalNodeFactory()); //The false parameter is for avoid a ValidationException that trows XOM
try {
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     nu.xom.Document input = builder.build(file);
     outputter.write(input);
     catch (Exception ex) {
     System.err.println(ex);
     ex.printStackTrace();
outputstream.close();
MessageDigest sha1 = MessageDigest.getInstance("SHA1");
sha1.reset();
sha1.update(java.nio.ByteBuffer.wrap(bytestream.toByteArray()));
salidasha1=sha1.digest();
String tagDigestValue=new String(Base64.encodeBase64(salidasha1));
/* Rest of digitalsig program */Take like 7 minutes to do the XML signature and the final XML it's like 2Gb :)
I hope that if some have the same problem can use this :)
And the final tips: AVOID DOM, with DOM i will need 10x of RAM the size of the XML File (in this case like 20Gb of RAM)
ps.: Other day i will post how much time take to process 1GB XML Files :)
Edited by: Enriquesmw on May 7, 2010 12:26 PM

Building big XML file from scratch - Urgent

Oracle 8.1.7.3 on windows NT platform
What is the best way to generate a quiet big XML file from multiple tables ?
I have information stored in many relational tables from which I need to generate a XML flat file either stored in a CLOB field or in a text file in a system directory. This XML file will be then used
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My XML file has many levels in it structure, I mean that it is composed of one root element with 2 children, each children has a 3 children. One on these 3 children has 2 children and so on. Actually there are more or less 10 nested levels.
To generate this XML file, I tried to use XSU for PL/SQL with the nested cursor() feature plus XSLT to transform the raw XML file to my requirements.
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This method works fine, but it takes time and it's not flexible at all as I have to construct each XML tag. I guest this way of proceeding is not the more efficient...
Using DOM method won't be better as I still need PL/SQL cursor to select each level of my XML structure and in addition I might for sure encounter a problem of memory.
So what solutions would you suggest to generate this XML file. It must be quiet fast. The XML file can be up to 2Mo big. My system is actually a kind of on-the-fly reports generation. I mean that the XML file needs to be created with up-to-date data many times during the working hours !
Quick answers or suggestions would be greatly appreciated. It's very urgent !!
Thanks

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ALI_2

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I have this big xml file which is 13MB which I am trying to parse by Java. The problem is that I get the message
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