How to use knowledge base keywords"?

I have found links to the the knowledge base document "how to use knowledge base keywords" online but all the links lead to a dead end. The document number is 75178, and explains the use of prefixes in the knowledge base keyword search. Has anyone any info on where this page is or if it still exists?
Thanks
Nadya

Apparently, the document's no longer available.

Similar Messages

How to use Knowledge Base template interactively?

I'm using RH11, and my management wants a Knowledge Base that allows our clients to add to it. When I opened the Knowledge Base template, I didn't see much that was different from a regular help file. The RH11 manual mentions this template twice with no instructions.
Where can I find more information on how to use the Knowledge Base template as a wiki, as promised in the manual?
Thank you!

Okay, I found it in the help. FWIW, it's also mentioned when creating a new project.
What this is referring to is that the project template will create and offer a page that never needs maintaining. The page is labeled "What's New", and describes a method of using See Also keywords to manage new and changed topics. If this method were not used, a "What's New" page would require creating links or specifically adding verbiage about each new topic.
It DOES NOT allow creating one or more pages that users may contribute to.
RoboHelp has never been an application that allows that type of collaboration. That's what Wiki software is for.
Cheers... Rick

How does solutions knowledge base works?

Hi Experts,
I created a new solutions knowledge base for item A and then i created a new service call for the item A also, but then when i clicked the button Recommend in the solutions tab in the service module the solutions knowledge base i just created for item A is not appearing in the recommendations list.
Anyone can guide me how this solutions knowledge base works in the service module.
Regards
--careLess

Hi,
If you love working with Muse, BC would enhance it as it completes Muse. WYSIWYG Design area in BC would give you the ultimate convenience designing the pages or templates.
I would suggest that you create a Trial site in BC via Muse and go through the modules available. Modules are not synced with Muse but they will be rendered if you specify them with a correct reference ID's (as detailed here kb.worldsecuresystems.com/134/bc_1345.html) in Muse and then Publish.
Business Catalyst is far more than a hosting provider. Business Catalyst is an online business platform, with email marketing, customer response management, eCommerce, forums, analytics, and more. Over time, Adobe Muse will grow to expose more of the power with Business Catalyst.
Adobe Muse allows you to publish your temporary website to Adobe Business Catalyst at no charge for a 30-day trial period. This gives you the opportunity to send a live URL to your client for review. All sites in trial mode on Business Catalyst will include the Business Catalyst domain, example http://website.businesscatalyst.com. If you decide to take the site "live" by paying for the monthly hosting, you can transfer your own domain and remove the .businesscatalyst.com subdomain. Or you can export the HTML and host the final site with a hosting provider of your choice.
You can have different users being an Admin on one site depending upon the permissions you set for them. + much more..
Publishing sites to BC via Muse is seamless. So I recommend to test the trial publish. That way you can judge it best upto your expertise. Also check http://tv.adobe.com/watch/introducing-business-catalyst/getting-started-with-business-cata lyst-and-muse-creating-and-publishing-sites/ for more help.
Hope that helps!

How to install knowledge base file for oracle text

how to install knowledge base file for oracle text?
there are couple of files droldUS.dat,.. which are required to generate gists and themes, where can i find them or install them.
please help!

I checked the download page and it says:
"All Release 2 download pages contain Oracle Companion, Client, Clusterware, Gateways, and Application Express standalone downloads"
so you should already have it. Try searching for the filename that was in your error message.

Apple knowledge base keywords

Hey all, sorry if this is a bit OT, but I figure that fellow server wranglers are often looking thru the apple knowledge base so this would be a good place to ask...
Apple used to have a doc dealing with keywords and their usage within the site, located below, but it is now dead...
http://docs.info.apple.com/article.html?artnum=75178
I was hoping someone knows where it now lives....
Thanks in advance!

Safari 7.1 can't display Apple Knowledge Base p...
Can't view Apple Support Knowledge Base in Safari
Apple Knowledgebase pages often blank

ABOUT query not affecting results or not using knowledge base

Hello again,
Another question here,
I've searched through the forum and have found other
posts on the same problem but no solutions, though
the problem isn't always the primary topic of the
forum. I've put this post up to hopefully put this
to rest as I'm pretty sure this is just a
configuration issue.
I am using an ABOUT operator in a CONTAINS query and
the query seems to return the same results as the
same query without the about operator, eg:
SELECT SCORE(0) AS scr,
file_repository.file_id,
file_repository.file_title
FROM file_repository
WHERE CONTAINS(index_url, 'ABOUT(australia)', 0) > 0
versus
SELECT SCORE(0) AS scr,
file_repository.file_id,
file_repository.file_title
FROM file_repository
WHERE CONTAINS(index_url, 'australia', 0) > 0
I have included documents based on the default
knowledge base should be found. For example I have
three documents, one containing the term 'Tasmania'
another containing 'Australia' and a third with
'Pacific Area'. The first query above should return
all three of these documents, but it only returns
the one containing 'Australia'.
I have used other examples from the default knowledge
base and have had no success. I have not attempted to
extend the knowledge base with a thesaurus as, from
what I can tell, I shouldn't need to do this for it
to work.
Any help would be much appreciated.

Hello.
Did you load the supplied english thesaurus as your DEFAULT thesaurus using the command line utility ctxload (or some other method)?
I had the same experience until I loaded the sample thesaurus in $ORACLE_HOME/ctx/sample/thes/. Now my ABOUT and SYN queries work as expected though I still have a concern about the incomplete nature of the sample thesauri (I'll open a new thread on that topic).
Hope this helps.

How to use the knowledge base category hierarchy?

Hi !
I read documents about the knowledge base, I know Oracle Text supplies English and French knowledge base, but I would like to know how to use it, how to handle it. If I want to had some themes, or delete some.
Is there a table containing the knowledge base?
Is there someone can help me? Thanks in advance
Have a nice day
PS : sorry for my poor english

Thank you very much M. Omar R Alonso for your reply.
I checked in the documentation how to use the ctx_query.hfeedback procedure, and I tried the example provided. But it doesn't work, the bt_feedback, rt_feedback, nt_feedback columms have never filled.
I'm not sure that the knowledge base is already supplied in Oracle Text, because also, when I execute a query like :
select ID_TXT, score(1) SCORE from TEXT_BASE where contains("idx_txt","sport",1)>1 order by SCORE DESC
The results are the same as
select ID_TXT, score(1) SCORE from TEXT_BASE where contains("idx_txt","about(sport)",1)>1 order by SCORE DESC
So, I don't know if it uses the knowledge base or not.
Thx again

About query not using extended knowledge base

Hello,
I compiled a small thesaurus to the knowledge base:
ctxkbtc -user dcenter/dcenter -name THES_PLACE
It contains:
GERMAN
USE FEDERAL REPUBLIC OF GERMANY
UF FRG
BT EUROPE
NT BAVARIAN
I have 2 record, 1 containing GERMAN, 1 containing BAVARIAN.
Field is indexed with a context index, and the index is synchronized.
I'm using 8.1.7.2 english.
Using an ABOUT operator, I always get 1 hit.
SQL> select count(*) from file_info where contains (places, 'about(BAVARIAN)') > 0;
The (9i) doc says:
When you augment the existing knowledge base with your new thesaurus, you query with the ABOUT operator which implicitly expands to synonyms and narrower terms.
How can I get the ABOUT query to expand to the narrower term in 8.1.7.2? Is this a bug, do I have to upgrade, or am I missing something?
Thanks

Hello.
Did you load the supplied english thesaurus as your DEFAULT thesaurus using the command line utility ctxload (or some other method)?
I had the same experience until I loaded the sample thesaurus in $ORACLE_HOME/ctx/sample/thes/. Now my ABOUT and SYN queries work as expected though I still have a concern about the incomplete nature of the sample thesauri (I'll open a new thread on that topic).
Hope this helps.

Firefox/3.5.10 to view cookies knowledge base says use tools/option: no tools/option

On freebsd7.0 or 8.2 firefox3.5.10. After upgrading the View Cookies add on no longer works.
The knowledge base says to view cookies use tools/options/Privacy. There is no Option under Tools.
How can I view a site's cookies?
Previous to View Cookies, I accessed by entering something as an URL that contain the cookie name, but I do not remember the syntax.
Can you give me the syntax.

I just looked again and firefox/ 3.10.1 has a link under edit/preferences/privacy "Remove Individual Cookies" that does let you look at the cookies. It sure is not a nice as the View Cookies 1.10.1extension before it quit working
Thanks for the help

I have the problem described in /forums/knowledge-base-articles/704725. (Firefox is already running but not responding). My only solution is to use Task Manager to end the firerfox process. I am the only user and there are no other profiles on my system

Occasionally I have the problem discussed in /forums/knowledge-base-articles/704725 , Firefox is already running. My only fix is to use Task Manager to end the firefox process. At such tmes, I have no other instances running.

'''https://support.mozilla.org/questions/997866?esab=a&s=&r=1&as=s'''.<BR>
This is not a cure but will make it easier if Firefox locks up.

How to use Add Query Criteria for the MySQL data Base in Netbeans ?

How to use Add Query Criteria for the MySQL data Base in Netbeans Visual web pack.
When the Query Criteria is add like
SELECT ALL counselors.counselors_id, counselors.first_name, counselors.telephone,counselors.email
FROM counselors WHERE counselors.counselors_id = ?
when i run this Query in the Query Window
i get a error message Box saying
Query Processing Error Parameter metadata not available for the given statement
if i run the Query with out Query Criteria its working fine.

*I am glad I am not the only one who have this problem. Part of issue has been described as above, there are something more in my case.
Whenever I try to call ****_tabRowSet.setObject(1, userDropList.getSeleted()); I got error message as shown below:*
The Java codes are:
public void dropDown1_processValueChange(ValueChangeEvent event) {
Object s = this.dropDown1.getSelected();
try {
this.User_tabDataProvider1.setCursorRow(this.User_tabDataProvider1.findFirst("User_Tab.User_ID", s));
this.getSessionBean1().getTrip_tabRowSet1().setObject(1, s);
this.Trip_tabDataProvider1.refresh();
} catch (Exception e) {
this.log("Error: ", e);
this.error("Error: Cannot select user"+e.getMessage());
SQL statement for Trip_tabRowSet:
SELECT ALL Trip_Tab.Trip_Date,
Trip_Tab.User_ID,
Trip_Tab.Destination
FROM Trip_Tab
WHERE Trip_Tab.User_ID = ?
Error messages are shown below:
phase(RENDER_RESPONSE 6,com.sun.faces.context.FacesContextImpl@5abf3f) threw exception: com.sun.rave.web.ui.appbase.ApplicationException: java.sql.SQLException: No value specified for parameter 1 java.sql.SQLException: No value specified for parameter 1
com.sun.rave.web.ui.appbase.faces.ViewHandlerImpl.cleanup(ViewHandlerImpl.java:559)
com.sun.rave.web.ui.appbase.faces.ViewHandlerImpl.afterPhase(ViewHandlerImpl.java:435)
com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:274)
com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:140)
javax.faces.webapp.FacesServlet.service(FacesServlet.java:245)
org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:397)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:184)
com.sun.webui.jsf.util.UploadFilter.doFilter(UploadFilter.java:240)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:216)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:184)
org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:368)
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:216)
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:184)
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:276)
org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:566)
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:536)
org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:240)
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:179)
org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:566)
com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:73)
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:182)
org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:566)
com.sun.enterprise.web.VirtualServerPipeline.invoke(VirtualServerPipeline.java:120)
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:939)
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:137)
org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:566)
org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:536)
org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:939)
org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:239)
com.sun.enterprise.web.connector.grizzly.ProcessorTask.invokeAdapter(ProcessorTask.java:667)
com.sun.enterprise.web.connector.grizzly.ProcessorTask.processNonBlocked(ProcessorTask.java:574)
com.sun.enterprise.web.connector.grizzly.ProcessorTask.process(ProcessorTask.java:844)
com.sun.enterprise.web.connector.grizzly.ReadTask.executeProcessorTask(ReadTask.java:287)
com.sun.enterprise.web.connector.grizzly.ReadTask.doTask(ReadTask.java:212)
com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:252)
com.sun.enterprise.web.connector.grizzly.WorkerThread.run(WorkerThread.java:75)
tandardWrapperValve[Faces Servlet]: Servlet.service() for servlet Faces Servlet threw exception
java.sql.SQLException: No value specified for parameter 1
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:910)
at com.mysql.jdbc.PreparedStatement.fillSendPacket(PreparedStatement.java:1674)
at com.mysql.jdbc.PreparedStatement.fillSendPacket(PreparedStatement.java:1622)
at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:1332)
at com.sun.sql.rowset.internal.CachedRowSetXReader.readData(CachedRowSetXReader.java:193)
at com.sun.sql.rowset.CachedRowSetXImpl.execute(CachedRowSetXImpl.java:979)
at com.sun.sql.rowset.CachedRowSetXImpl.execute(CachedRowSetXImpl.java:1439)
at com.sun.data.provider.impl.CachedRowSetDataProvider.checkExecute(CachedRowSetDataProvider.java:1274)
at com.sun.data.provider.impl.CachedRowSetDataProvider.setCursorRow(CachedRowSetDataProvider.java:335)
at com.sun.data.provider.impl.CachedRowSetDataProvider.setCursorIndex(CachedRowSetDataProvider.java:306)
at com.sun.data.provider.impl.CachedRowSetDataProvider.getRowCount(CachedRowSetDataProvider.java:639)
at com.sun.webui.jsf.component.TableRowGroup.getRowKeys(TableRowGroup.java:1236)
at com.sun.webui.jsf.component.TableRowGroup.getFilteredRowKeys(TableRowGroup.java:820)
at com.sun.webui.jsf.component.TableRowGroup.getRowCount(TableRowGroup.java:1179)
at com.sun.webui.jsf.component.Table.getRowCount(Table.java:831)
at com.sun.webui.jsf.renderkit.html.TableRenderer.renderTitle(TableRenderer.java:420)
at com.sun.webui.jsf.renderkit.html.TableRenderer.encodeBegin(TableRenderer.java:143)
at javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:810)
at com.sun.webui.jsf.component.Table.encodeBegin(Table.java:1280)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:881)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:889)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:889)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:889)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:889)
at javax.faces.component.UIComponent.encodeAll(UIComponent.java:889)
at com.sun.faces.application.ViewHandlerImpl.doRenderView(ViewHandlerImpl.java:271)
at com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:182)
at com.sun.rave.web.ui.appbase.faces.ViewHandlerImpl.renderView(ViewHandlerImpl.java:285)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:133)
at com.sun.faces.lifecycle.LifecycleImpl.phase(LifecycleImpl.java:244)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:140)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:245)
at org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:397)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:184)
at com.sun.webui.jsf.util.UploadFilter.doFilter(UploadFilter.java:240)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:216)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:184)
at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:368)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:216)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:184)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:276)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:566)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:536)
at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:240)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:179)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:566)
at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:73)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:182)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:566)
at com.sun.enterprise.web.VirtualServerPipeline.invoke(VirtualServerPipeline.java:120)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:939)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:137)
at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:566)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:536)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:939)
at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:239)
at com.sun.enterprise.web.connector.grizzly.ProcessorTask.invokeAdapter(ProcessorTask.java:667)
at com.sun.enterprise.web.connector.grizzly.ProcessorTask.processNonBlocked(ProcessorTask.java:574)
at com.sun.enterprise.web.connector.grizzly.ProcessorTask.process(ProcessorTask.java:844)
at com.sun.enterprise.web.connector.grizzly.ReadTask.executeProcessorTask(ReadTask.java:287)
at com.sun.enterprise.web.connector.grizzly.ReadTask.doTask(ReadTask.java:212)
at com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:252)
at com.sun.enterprise.web.connector.grizzly.WorkerThread.run(WorkerThread.java:75)
Also when I tried to update my MYSQL connector / J driver to version 5.1.5 from 5.0.5 (NB 5.5.1) and 5.0.7 (NB 6.1), I could not get it work (looooong time to search some JDBC classes and with no response in the end) on both of my Netbean 5.5.1(on PC) and Netbean 6.1(on laptop) IDEs.
Could anybody look into this issue.
Many thanks
Edited by: linqing on Nov 22, 2007 4:48 AM

How to reference a class without using the new keyword

I need to access some information from a class using the getter, but I don't want to use the new keyword because it will erase the information in the class. How can I reference the class without using the new keyword.
ContactInfo c = new ContactInfo(); // problem is here because it erases the info in the class
c.getFirstName();

quedogf94 wrote:
I need to access some information from a class using the getter, but I don't want to use the new keyword because it will erase the information in the class. How can I reference the class without using the new keyword.
ContactInfo c = new ContactInfo(); // problem is here because it erases the info in the class
c.getFirstName();No.
Using new does not erase anything. There's nothing to erase. It's brand new. It creates a new instance, and whatever that constructor puts in there, is there. If you then change the contents of that instance, and you want to see them, you have to have maintained a reference to it somewhere, and access that instance's state through that reference.
As already stated, you seem to be confused between class and instance, at the very least.
Run this. Study the output carefully. Make sure you understand why you see what you do. Then, if you're still confused, try to rephrase your question in a way that makes some sense based on what you've observed.
(And not that accessing a class (static) member through a reference, like foo1.getNumFoos() is syntactically legal, but is bad form, since it looks like you're accessing an instance (non-static) member. I do it here just for demonstration purposes.)
public class Foo {
private static int numFoos; // class variable
private int x; // instance varaible
public Foo(int x) {
    this.x = x;
    numFoos++;
// class method
public static int getNumFoos() {
    return numFoos;
// instance method
public int getX() {
    return x;
public static void main (String[] args) {
    System.out.println ("Foo.numFoos is " + Foo.getNumFoos ());
    System.out.println ();
    Foo foo1 = new Foo(42);
    System.out.println ("Foo.numFoos is " + Foo.getNumFoos ());
    System.out.println ("foo1.numFoos is " + foo1.getNumFoos ());
    System.out.println ("foo1.x is " + foo1.getX ());
    System.out.println ();
    Foo foo2 = new Foo(666);
    System.out.println ("Foo.numFoos is " + Foo.getNumFoos ());
    System.out.println ("foo1.numFoos is " + foo1.getNumFoos ());
    System.out.println ("foo1.x is " + foo1.getX ());
    System.out.println ("foo2.numFoos is " + foo2.getNumFoos ());
    System.out.println ("foo2.x is " + foo2.getX ());
    System.out.println ();
}

How to use order by in stored procedure base block?

How to use order by in stored procedure base block? I need to change order by dynamically

Use SET_BLOCK_PROPERTY('BLOCK_NAME',ORDER_BY,'COLUMN_NAME1, COLUMN_NAME2');

How to use base band wave,subcarrier wave and carrier wave to creat the FM wave? When I use the MT Modulate FM VI in USRP,I don't konw how to use it.

How to use base band wave,subcarrier wave and carrier wave to creat the FM wave? When I use the MT Modulate FM VI in USRP,I don't konw how to
use it.

https://decibel.ni.com/content/docs/DOC-24206
Let us know if that example doesn't help you
Anthony F.
Product Marketing Engineer
National Instruments

Oracle deadlock - how to use "synchronised" keyword in a transaction?

Hi,
I use WL6.1 SP4, Oracle 8.1.6, with some Java objects which execute a
lot
of SQL queries (mixed update, insert and select) using plain JDBC
calls,
and Weblogic connection pools. These objects are called by servlets.
I experienced recently deadlocks when two users call the object at the
same
time (See error below).
I execute the queries using "synchronized" keyword in the following
way:
synchronized (this)
conConnection.setAutoCommit(false);
executeTransaction(myStatement);
conConnection.commit();
executeTransaction is overriden in sub-classes and is the method which
executes
all the queries.
It calls methods in other objects. These methods are not declared as
synchronized.
1) Should they?
2) Should I use the keyword "synchronized" in another way?
3) This part of code is also called when I do only "select"
statements. I guess
it should only be synchronized when we do "update" and "insert" which
could lead
to a deadlock?
4) Do you have any idea why this deadlock occurs as I use the
"synchronized"
keyword, and one thread should wait until the other one has finished?
Thanks for any idea,
Stéphanie
----------------- error:
<ExecuteThread: '4' for queue: 'default'> <> <> <000000> <SQL request
sent to database: UPDATE PARTICIPANT par SET par.PARTICIPANTLASTRANK =
4 WHERE par.IDPARTICIPANT = 8983566>
<ExecuteThread: '11' for queue: 'default'> <> <> <000000> <SQL request
sent to database: UPDATE PARTICIPANT par SET par.PARTICIPANTLASTRANK =
6 WHERE par.IDPARTICIPANT = 8983570>
ORA-00060: deadlock detected while waiting for resource
     at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:134)
     at oracle.jdbc.ttc7.TTIoer.processError(TTIoer.java:289)
     at oracle.jdbc.ttc7.Oall7.receive(Oall7.java:573)
     at oracle.jdbc.ttc7.TTC7Protocol.doOall7(TTC7Protocol.java:1891)
     at oracle.jdbc.ttc7.TTC7Protocol.parseExecuteFetch(TTC7Protocol.java:1093)
     at oracle.jdbc.driver.OracleStatement.executeNonQuery(OracleStatement.java:2047)
     at oracle.jdbc.driver.OracleStatement.doExecuteOther(OracleStatement.java:1940)
     at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:2709)
     at oracle.jdbc.driver.OracleStatement.executeUpdate(OracleStatement.java:796)
     at weblogic.jdbc.pool.Statement.executeUpdate(Statement.java:872)
     at weblogic.jdbc.rmi.internal.StatementImpl.executeUpdate(StatementImpl.java:89)
     at weblogic.jdbc.rmi.SerialStatement.executeUpdate(SerialStatement.java:100)
     at bfinance.framework.EDBBLBean.executeSQL(EDBBLBean.java:299)

Hi Stepanie,
I'd try to group update statement together. Usually it helps.
Regards,
Slava Imeshev
"Stephanie" <[email protected]> wrote in message
news:[email protected]...
Thanks for your answer.
In the case you describe, is there a way to ensure that tx-2 waits for
tx-1
to be finished before beginning?
My transaction which causes the problem is the following (simplified):
UPDATE tableA SET islast=0 WHERE externalid=myid;
for (int i=0; i< aVector.size(); i++) {
INSERT INTO tableA (id, islast, ranking, externalid) (SELECT
SEQ_tableA.nextval, 1, 0, myid);
UPDATE tableA SET ranking = /*calculated ranking */
WHERE externalid=myid AND islast=1;
UPDATE tableB ....
commit;
tx-1 and tx-2 execute this transaction at the same time. tx-1 begins
The deadlock appears when tx-2 executes the second UPDATE tableA
query.
I don't see how I can avoid to execute these two update queries, so if
I can find another way to prevent deadlock, it would be great!
Stéphanie
Joseph Weinstein <[email protected]_this> wrote in message
news:<[email protected]_this>...
Stephanie wrote:
Hi,
I use WL6.1 SP4, Oracle 8.1.6, with some Java objects which execute a
lot
of SQL queries (mixed update, insert and select) using plain JDBC
calls,
and Weblogic connection pools. These objects are called by servlets.
I experienced recently deadlocks when two users call the object at the
same
time (See error below).Hi. The error you are getting isn't necessarily from a lack ofsynchronization
of your java objects. It has to do with the order in which you accessDBMS
data. You are getting ordinary DBMS deadlocks, which are caused when
two DBMS connections each have a lock the other wants, in order toproceed.
The DBMS will quickly discover this and will kill one transaction inorder to
let the other one proceed:
time 0: tx-1 and tx-2 have started.....
time 1: tx-1: update tableA set val = 1 where key = 'A'
time 2: tx-2: update tableB set val = 2 where key = 'B'
time 3: tx-1: update tableB set val = 1 where key = 'B' (waitsbecause tx-2 has the row
locked)
time 4: tx-2: update tableA set val = 2 where key = 'A' (waitsbecause tx-1 has the row
locked)
This is a deadlock. The solution is to organize your application code sothat every
transaction accesses the data in the same order, eg: update tableAfirst, then update tableB.
This will prevent deadlocks.
Joe Weinstein at BEA
I execute the queries using "synchronized" keyword in the following
way:
synchronized (this)
conConnection.setAutoCommit(false);
executeTransaction(myStatement);
conConnection.commit();
executeTransaction is overriden in sub-classes and is the method which
executes
all the queries.
It calls methods in other objects. These methods are not declared as
synchronized.
1) Should they?
2) Should I use the keyword "synchronized" in another way?
3) This part of code is also called when I do only "select"
statements. I guess
it should only be synchronized when we do "update" and "insert" which
could lead
to a deadlock?
4) Do you have any idea why this deadlock occurs as I use the
"synchronized"
keyword, and one thread should wait until the other one has finished?
Thanks for any idea,
Stéphanie
----------------- error:
<ExecuteThread: '4' for queue: 'default'> <> <> <000000> <SQL request
sent to database: UPDATE PARTICIPANT par SET par.PARTICIPANTLASTRANK =
4 WHERE par.IDPARTICIPANT = 8983566>
<ExecuteThread: '11' for queue: 'default'> <> <> <000000> <SQL request
sent to database: UPDATE PARTICIPANT par SET par.PARTICIPANTLASTRANK =
6 WHERE par.IDPARTICIPANT = 8983570>
ORA-00060: deadlock detected while waiting for resource
at
oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:134)
at oracle.jdbc.ttc7.TTIoer.processError(TTIoer.java:289)
at oracle.jdbc.ttc7.Oall7.receive(Oall7.java:573)
atoracle.jdbc.ttc7.TTC7Protocol.doOall7(TTC7Protocol.java:1891)
atoracle.jdbc.ttc7.TTC7Protocol.parseExecuteFetch(TTC7Protocol.java:1093)
atoracle.jdbc.driver.OracleStatement.executeNonQuery(OracleStatement.java:2047
atoracle.jdbc.driver.OracleStatement.doExecuteOther(OracleStatement.java:1940)
atoracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java
:2709)
atoracle.jdbc.driver.OracleStatement.executeUpdate(OracleStatement.java:796)
atweblogic.jdbc.pool.Statement.executeUpdate(Statement.java:872)
atweblogic.jdbc.rmi.internal.StatementImpl.executeUpdate(StatementImpl.java:89
atweblogic.jdbc.rmi.SerialStatement.executeUpdate(SerialStatement.java:100)
at bfinance.framework.EDBBLBean.executeSQL(EDBBLBean.java:299)

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