Jdeveloper Team RE Jdeveloper 9.0.3 For Non-Oracle Databases

I see that support for non-Oracle databases and Third-Party JDBC drivers is very improved. However, I have tried to use the SAPDb JDBC driver and the BC4J tester and generated Swing clients all display greyed so that no updates are possible. This appears to be a bug since Jbuilder works fine with this driver. However, I think Jbuilder's Express dataset and commit philosophy is really bad. Any commitments as to when this will be fixed?

Yes, I examined the attribute settings and manually adjusted them in the entities and views. They are now updateable. Using Jdeveloper with SAPDB would be very tedious. Jdeveloper did not recognize foreign key constrains, primary keys, nor that attributes were updateable.
Is there a way to include SAPDB in the testing? It is trivial to install and run and would make Jdeveloper a more robust tool. I do not like Jbuilder's approach to master-detail client screens and would recommend using Jdeveloper for this type of work if it could handle more databases like SapDb.

Similar Messages

Can Jdeveloper Be Used For Non-Oracle Databases

I have been trying to evaluate Jdeveloper 9i and Jbuilder 7 Enterprise for Swing database development. I am particularly interested in the productivity enhancements such as BC4J and Jclient. The underlying database might be Oracle, SapDb (excellent, easy to use, and free), SQLServer, etc.
I evaluated Jbuilder Enterprise tools and it worked flawlessly with SapDb. This emphasized using their DataExpress and DbSwing components which provide many useful capabilities similar to BC4j and Jclient. It also involved using their DBPilot tool which allows browsing similar to that provided via a Jdeveloper connection.
I tried to use Jdeveloper for the same SapDB and it is essentially non-functional. I followed the instructions for using a non-default driver and tried to define a connection. It behaved inconsistently: often saying no suitable driver can be found and yet when you edit the connection and test without making any changes, it works. If you try to establish a BC4J definition, it is very inconsistent and fails to recognize important details as foreign keys. Even if you define a ViewLink manually, it still does not work properly if you attempt to define a Master-Detail Jclient form. As I have stated, all these types of capabilities worked flawlessly in their Jbuilder equivalent. Furthermore, I really like the fact that Jbuilder gives many of BC4Js benefits without needing a BC4J J2EE container.
Has anyone had real success using Jdeveloper's advanced features to develop for non-Oracle databases and if so, how did you get around these types of problems?

Hi,
generally, SCAN can be used for 10g databases and you discovered the first half: for 10g databases you will have to modify the REMOTE_LISTENER entry for each 10g database instance to point to the SCAN listeners (as opposed to pointing to the remote local listeners, which is the default in 10g). You could even have the databases registers themselves with SCAN and the remote listeners, if you wanted to... It's more or less a matter of configuration. But for simplification reasons, I will stick to the case where you have your 10g databases register with the SCAN listeners only.
Now the other half is the client and the client configuration. An 11g Rel. 2 client configured for RAC would have a TNSNAMES entry that has only one address line for the RAC databases. The host entry in this one address line should point to the SCAN (the SCAN name is ideally resolved in DNS). A 10g client configured for RAC would have as many address lines in the TNSNAMES as you have nodes in the cluster.
The 10g client SCAN configuration would then be in the middle so to speak: You would have 3 address lines in your TNSNAMES, in which each host entry would resolve to one SCAN address (I assume you will use the recommended default of 3 SCAN IPs). If you choose, you can have a name resolution for each of your SCAN IPs, but this would not be required. Now, why would you do it this way? Because this configuration will always work and does not make you dependent on certain functionality that your DNS server may or may not offer.
For the remaining questions: SCAN is a DNS entry resolving one name to more than one (typically 3) IP addresses. OID is short for Oracle Internet Directory, which is a complete LDAP server. And you are right that there is no document how to configure 10g clients for SCAN from Oracle yet. However, there is a quite good document on SCAN on otn.oracle.com/rac, but I am sure you are aware of it already.
Hope that helps. Thanks,
Markus

Pagination support for non-Oracle databases?

Hi,
I just read this thread (Pagination Support on pagination support. Is there any way to get pagination with non-Oracle databases? We are using an IBM iSeries / AS/400 DB2 database right now, and we're planning to use some local lightweight database in the near future as well (probably Cloudscape/Derby or "IBM Everyplace database".)
We currently use code like this:
String sql = "SELECT art FROM Artikel art" +
            /* dynamically generated where statement is added here */
            + "ORDER BY art.artikelNummer";
Query q = em.createQuery(sql);
q.setFirstResult(firstResult);
q.setMaxResults(maxResults);If I look in the TopLink logs, I see queries like this:
SELECT ARTNR, ARALT, ARAFJ, ARXII, ARAVJ, ARXIV, ARANJ, AHGCD, ARNVJ, ARCRJ, ARARK, ARFKJ, ARTNK, ARGP1, ASGCD, ARGP2, ARPR1, ARGP3, ARPR2, AREX1, ARPR3, AREX2, ARPR4, AREX3, ARASA, ARINA, ASSCD, ARIA1, ARBAN, ARIN1, ARBAV, ARIA2, ARBAK, ARIN2, ARCES, ARIA3, ARCDT, ARIN3, ARCRE, ARIA4, ARCWK, ARIN4, ARHBH, ARIA5, ARDFA, ARIN5, ARDFG, ARIA6, ARDOS, ARIN6, AREPW, ARINN, ARFOD, ARIAS, ARFOE, ARINS, ARFOF, ARNAB, ARFOI, ARNIB, ARFON, ARNIA, ARFOS, ARNN1, ARFTA, ARNA2, ARVIV, ARNO2, ARGAP, ARNN3, ARGPT, ARNA4, ARGPD, ARNO4, ARGPA, ARNN5, ARGPO, ARNA6, ARHIS, ARNN6, ARISP, ARNIO, ARKHM, ARNNS, MAGCD, AROVJ, MTGCD, ARPL1, ARMXM, ARPL2, MRKCD, ARPL3, ARMVR, ARVKJ, ARMIM, ARV12, ARMDT, ARVVJ, ARMTE, AR#VR, ARMTU, ARZLS, ARMTM, ARIAT, ARMWK, ARAVS, MPCCD, ARNVS, ARBTW, ARFJS, ARXI2, ARG2S, ARXI3, ARE1S, ARXI4, ARE3S, ARXI6, ARIB1, ARXI1, ARIB2, ARXI5, ARIB3, AROPI, ARIB4, ARPRV, ARIB5, SZGCD, ARIB6, ARSPC, ARINO, ARSMF, ARIOS, VEAAN, ARNIS, ARSYN, ARNO1, ARVR1, ARNA3, ARV1S, ARNN4, ARVR2, ARNO5, ARV2S, ARNIN, ARVR3, ARNOS, ARV3S, ARP1S, ARTFA, ARP3S, ARTFG, ARS12, ARUVC, ARZLD, ARUCW, ARAJS, ARBKV, ARCJS, ARVVI, ARG3S, ARVVP, ARINB, VPOCD, ARIO2, VPECD, ARIO4, ARVIH, ARIO6, ARVHG, ARNBS, ARVRW, ARNN2, ARVPR, ARNA5, ARVVR, ARNAS, ARVVS, ARP2S, ARVV1, ARSVV, ARZK1, ARNJS, ARNA1, ARNO3, ARIO1, ARNO6, ARIO5, AROJS, ARE2S, ARVJS, ARIBS, ARIAD, ARIO3, ARG1S FROM ART WHERE ((((ARUVC = 'N') AND (ARHIS = 'N')) AND (ASGCD = 7)) AND (AHGCD = 15)) ORDER BY ARTNR ASC
(Yeah, I know we have too much columns in the table...)
So, no pagination in the query. As you can see, we have a mechanism in place to dynamically generate a where clause. This is because the user can set filters. The problem is, if our user sets a filter that causes the result set to be significantly smaller, the performance is way better than when he sets no filter at all. We suppose this is because the whole result set is sent to TopLink, regardless of the values of firstResult and maxResults.
We are using TopLink Essentials 2.1-10, by the way.
Message was edited by:
Bart Kummel

Hi all,
I'm trying to subclass <tt>DatabasePlatform</tt> to add pagination support for the AS/400 DB2 database of my customer. To be fair, it is not going very well so far.
The first problem is, the query Chris found by googling (Re: Pagination support for non-Oracle databases?), does not work for AS/400s version of DB2. In fact, although it is called "DB2", the database on the AS/400 system is a whole other database than the "normal" DB2 database that runs on Windows and *nix. The AS/400 DB2 simply does not have a "ROW_NEXT" function.
Another option would be to use the <b>row_number() over()</b> mehtod. But, as can be read here, this function is only available from version V5R4 of OS/400. And guess what? We're stuck on V5R3 at this client. (We cannot upgrade, because there's an application in use that's written in Delphi and IBM dropped the Delphi binding from V5R4...)
So I pretty much ran out of options. On the mailing list I linked to above, someone mentions the option to make a sort of stored procedure that generates a row count number. An example of how to do this can be found here. I implemented it, and ended up with this code:
package com.myclientsname.persistence;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import org.eclipse.persistence.expressions.ExpressionBuilder;
import org.eclipse.persistence.internal.databaseaccess.DatabaseCall;
import org.eclipse.persistence.internal.expressions.ExpressionSQLPrinter;
import org.eclipse.persistence.internal.expressions.SQLSelectStatement;
import org.eclipse.persistence.internal.sessions.AbstractSession;
import org.eclipse.persistence.logging.SessionLog;
import org.eclipse.persistence.platform.database.DatabasePlatform;
import org.eclipse.persistence.sessions.SessionProfiler;
public class AS400Platform extends DatabasePlatform {
    private static final long serialVersionUID = 0L;
    public AS400Platform(){
         super();
         super.setShouldBindAllParameters(false);
    public void printSQLSelectStatement(DatabaseCall call, ExpressionSQLPrinter printer, SQLSelectStatement statement) {
        int max = 0;
        int firstRow = 0;
        if (statement.getQuery()!=null){
            max = statement.getQuery().getMaxRows();
            firstRow = statement.getQuery().getFirstResult();
        if ( !(max>0) && !(firstRow>0) ){
            super.printSQLSelectStatement(call, printer,statement);
            return;
        } else {
            statement.setUseUniqueFieldAliases(true);
            ExpressionBuilder builder = new ExpressionBuilder();
            statement.addField(builder.getField("COUNTER() AS CNTR"));
            printer.printString("SELECT * FROM (");
            call.setFields(statement.printSQL(printer));
            printer.printString(") AS R WHERE R.CNTR >= ");
            printer.printParameter(DatabaseCall.FIRSTRESULT_FIELD);
            if ( max > 0 ){
                // Use of binding parameters is not allowed here, so use
                // String concatenation instead...
                printer.printString(" FETCH FIRST " + max + " ROWS ONLY");
        call.setIgnoreFirstRowMaxResultsSettings(true);
    public boolean wasFailureCommunicationBased(SQLException exception, Connection connection, AbstractSession sessionForProfile){
        if (connection == null || this.pingSQL == null){
            //Without a connection we are unable to determine what caused the error so return false.
            //The only case where connection will be null should be External Connection Pooling so
            //returning false is ok as there is no connection management requirement
                //If there is no ping sql then we can not perform the ping.
            return false;
        PreparedStatement statement = null;
        try{
            sessionForProfile.startOperationProfile(SessionProfiler.ConnectionPing);
            if (sessionForProfile.shouldLog(SessionLog.FINE, SessionLog.SQL)) {// Avoid printing if no logging required.
                 sessionForProfile.log(SessionLog.FINE, SessionLog.SQL, getPingSQL(), (Object[])null, null, false);
            statement = connection.prepareStatement(getPingSQL());
            ResultSet result = statement.executeQuery();
            result.close();
            statement.close();
        }catch (SQLException ex){
            try{
                // Had to add this check because of NullPointerExceptions
                // (maybe a bug?)
                if(statement != null){
                    //try to close statement again in case the query or result.close() caused an exception.
                    statement.close();
            } catch (SQLException exception2) {
                //ignore;
            return true;
        }finally{
            sessionForProfile.endOperationProfile(SessionProfiler.ConnectionPing);
        return false;
}(As you can see, I had to override the <tt>wasFailureCommunicationBased()</tt> method as well, due to some unexpected NPE's. (A bug, perhaps?))
This code does work. However, the performance is not very well. The first page comes relatively fast, but as you browse further in the table, each page comes slower. I assume this is because the counter() method has to be evaluated for each row in the table.
I have to get the performance better and constant. Does anyone have an idea how to optimize this further?
Best regards,
Bart Kummel

GLOBAL VARIABLES FOR NON-ORACLE DATABASE

What is the alternative of global variables in Form 5.0 when using non-oracle databases. I know one way is passing parameters, is there any other way? I have few variables which need to be global in my application.
Thank you
null

There is no other way.. you have to use either Global variables or parameter lists to pass values from one form to another form.. With in the form you can always use null canvas item to store and pass values in different program units or triggers..
have a nice day
Suresh

Configuration Managment Pack for Non Oracle Systems (new)

Hi ,
There is a pack called "Configuration Management" for the database. This pack manage hardware , software , updates, patches, etc for host that have installed any Oracle Software.
Now, in EM Release 2 there is a new pack "Configuration Managment Pack for Non Oracle Systems" wich basically will allow me to the same but without the requirement to have any Oracle software installed.
The question is : Where can i find a white paper about it? i been looking around and there is only mentions of the product, but not extra info. I know is out already 3k p/processor..
Any ideas?
Sergio Benavides

Found this dated Oct 2005
(Note the "priced in Advance of Availability" piece)
Standalone Managers
Configuration Management Pack for Non-Oracle Systems (priced in Advance of Availability) 2.375 522,59 Per Processor -
Provisioning Pack (priced in Advance of Availability) 2.375 522,59 Per Processor -
Service Level Management Pack (priced in Advance of Availability) 79 17,42 Test -
(Must license with Beacon Plus Test pricing) 2.375 522,59 Beacon -
System Monitoring Plug-in for Hosts (priced in Advance of Availability) 1.188 261,29 Per Processor -
System Monitoring Plug-in for Non Oracle Databases (priced in Advance of Availability) 1.188 261,29 Per Processor -
System Monitoring Plug-in for Non Oracle Middleware (priced in Advance of Availability)
25 1.188 261,29 Per Processor -
System Monitoring Plug-in for Network Devices (priced in Advance of Availability)
26 1.188 261,29 Per Network Device -
System Monitoring Plug-in for Storage (priced in Advance of Availability)
27

Multi Database Support: TimeQuery setting for non-oracle

Hello,
I wanted to develop ADF Application which is database-neutral and thus SQL92 type application.
I actually wanted to make sure that my application runs fine at least on MySQL DB. Therefore I set up my connection in JDeveloper to Mysql database but I started facing issues while working with it. See this > Re: [ADF-11.1.2] Non Sense Associations and View Links while using Mysql as DB
Also there's some limitation while working with non-oracle database like : JDeveloper can't recognize primary key column, therefore developer has to manually select primary key attribute in each EO.
Therefore, I thought to use Oracle DB to overcome from above issues and with Application as SQL92 type.
Information to share, if applicable to you as well:
1. database-neutral SQLs: It may not be possible to come up with CREATE TABLE SQL statement which is database-neutral. i.e. You have to modify SQL scripts generated from Oracle Database Model to make it work with other database. This I think is difficult part, but with proper care and with the help of tool, you can achieve the CREATE SQL statements for other database.
2. Under Model.jpx file of Model project, you can then add your non-oracle Database to test your application with. But make sure you select Oracle Connection while developing/changing Model layer of project << This is again because i think Jdeveloper has some issue with non-oracle Database (mentioned above)
3. Under bc4j.xcfg file (right click AppModel > Configurations...), you properly set value of "sql92 Db Time Query" (jbo.sql92.DbTimeQuery) property . For e.g. default is "select sysdate from dual" which is compatible to oracle database to fetch the current date from database. However this doesn't work with MySQL. You need to set it as "select now()as CurrentDateTime" if you are using MYSQL. This is require if you are using History Column on EO (I don't know if it is require for other purpose of not!) . Following is the code of bc4j.xcfg, notice "jbo.sql92.DbTimeQuery" property.
<?xml version = '1.0' encoding = 'UTF-8'?>
<BC4JConfig version="11.1" xmlns="http://xmlns.oracle.com/bc4j/configuration">
   <AppModuleConfigBag ApplicationName="model.bc.am.AppModule">
      <AppModuleConfig name="AppModuleLocal" DeployPlatform="LOCAL" jbo.project="model.Model" ApplicationName="model.bc.am.AppModule" java.naming.factory.initial="oracle.jbo.common.JboInitialContextFactory">
         <Database jbo.TypeMapEntries="Java" jbo.locking.mode="optimistic" jbo.SQLBuilder="SQL92"
                   jbo.sql92.DbTimeQuery="select now()as CurrentDateTime"/>
         <Security AppModuleJndiName="model.bc.am.AppModule"/>
         <Custom JDBCDataSource="java:comp/env/jdbc/appuser_mysqlDS"/>
      </AppModuleConfig>
      <AppModuleConfig name="AppModuleShared" DeployPlatform="LOCAL" jbo.project="model.Model" ApplicationName="model.bc.am.AppModule" java.naming.factory.initial="oracle.jbo.common.JboInitialContextFactory">
         <AM-Pooling jbo.ampool.isuseexclusive="false" jbo.ampool.maxpoolsize="1"/>
         <Database jbo.TypeMapEntries="Java" jbo.locking.mode="optimistic" jbo.SQLBuilder="SQL92"
                   jbo.sql92.DbTimeQuery="select now()as CurrentDateTime"/>
         <Security AppModuleJndiName="model.bc.am.AppModule"/>
         <Custom JDBCDataSource="java:comp/env/jdbc/appuser_mysqlDS"/>
      </AppModuleConfig>
   </AppModuleConfigBag>
</BC4JConfig>Note: Point 3 is not mentioned anywhere. Not even here > http://www.oracle.com/technetwork/developer-tools/jdev/mysql-and-bc-howto-082060.html.
Questions:
1. How would I make "jbo.sql92.DbTimeQuery" work with other database. It seems I have to hard code the value of it. Can't we externalize it so that we can set it dynamically ?
2. I am sharing this what I noticed and which is not yet documented (at least I haven't found it anywhere)... please let me know if you are aware of any setting needs to be done which may not be documented ?

Did you ever find out more information about working with Dates in non-oracle databases?

Error when installing 9.0.1.4.0 patch set for the Oracle Database Server.

Hi to all.
Currently, i am trying to install patches for portal server.
The server OS is Sun Solaris 8.
We are using Oracle9iAS.
Now, we are installing 9.0.1.4.0 patch set for the Oracle Database Server.
We managed to install the patch, but have problem with the Post Install Action.
We managed to run
-ALTER SYSTEM ENABLE RESTRICTED SESSION;
-@rdbms/admin/catpatch.sql
-ALTER SYSTEM DISABLE RESTRICTED SESSION;
-CONNECT / AS SYSDBA
-update obj$ set status=5 where type#=29 and owner#!=0;
-commit;
But, when we come to the next command, which is to shutdown, it gives us like
this..
SQL> update obj$ set status=5 where type#=29 and owner#!=0;
1402 rows updated.
SQL> commit;
Commit complete.
SQL> shutdown immediate
Database closed.
Database dismounted.
ORA-00604: error occurred at recursive SQL level 1
ORA-01219: database not open: queries allowed on fixed tables/views only
We tried to startup the database..it gives us this error..
SQL> startup
ORA-01081: cannot start already-running ORACLE - shut it down first
So, we tried to shutdown again..
SQL> shutdown immediate
ORA-01089: immediate shutdown in progress - no operations are permitted
I been informed that this is maybe a Database problem related. Any ideas?
Best Wishes,
Rushdan Md Saad.

Patchsets could be obtained (only) from http://metalink.oracle.com
You need to have valid CSI for access.
P.S: Sorry Werner, I didn't see you post.
Message was edited by:
Ivan Kartik

Mapping deploy for Non-Oracle Data Source hangs

Hi All,
I am trying to deploy mapping for Non-Oracle Data Source and it hangs.
Oracle version is 10.2.0.3 and OWB version is 10.2.0.1.3.1
It would be really appreciated if you can help.
Thanks!
PS.

That helpes quite a bit. I still can't get the app to retrieve data, but I am getting a more useful message in the log:
[Error in allocating a connection. Cause: Connection could not be allocated because: ORA-01017: invalid username/password; logon denied]
As you suggested, I removed the <default-resource-principal> stuff from sun-web.xml and modified it to match your example. Additionally, I changed the <res-ref-name> in web.xml from "jdbc/jdbc-simple" to "jdbc/oracle-dev".
The Connection Pool "Ping" from the Admin Console is successful with the user and password I have set in the parameters. (it fails if I change them, so I am pretty sure that is set up correctly) Is there another place I should check for user/pass information? Do I need to do anything to the samples/database.properties file?
By the way, this is the 4th quarter 2004 release of app server. Would it be beneficial to move to the Q1 2005 beta?
Many thanks for your help so far...

Enterprise system for big oracle database and datawarehouse

Hi
i wana to implemnet System for Big Oracle Database that increase rapidly(monthly by 20 GB).
what is the best and specification of the required servers.
what is the best way to implemnet backup for my big database.
what is required server to implement Datawarehouse.
what others servers i need to implement applications that will interact with the big oracle database and Data Warehouse.
Best Regards,
Alaa

Hi
i wana to implemnet System for Big Oracle Database that increase rapidly(monthly by 20 GB).
what is the best and specification of the required servers.
what is the best way to implemnet backup for my big database.
what is required server to implement Datawarehouse.
what others servers i need to implement applications that will interact with the big oracle database and Data Warehouse.
Best Regards,
Alaa

JDBC for non-relational Databases.

Hi All,
correct me if I am wrong in my understanding,
1. JDBC are a set of specifications (as interfaces etc..) which each
vendor is expected to provide implementation.
2. JDBC is for relationsla databases only (like oracle,MySQL etc..) it
does not take into account the access to non-relational databases.
3. If 2 is true, is there an equivalent of JDBC for non-relational
databases?
TIA.

1. JDBC are a set of specifications (as interfaces etc..) which each
vendor is expected to provide implementation.
Broadly speaking, yes. It doesn't have to be the vendor that provides the implementation, and an ODBC driver (to be used via the JdbcOdbc bridge) is adequate if a native JDBC driver is not available.
2. JDBC is for relationsla databases only (like oracle,MySQL etc..) it
does not take into account the access to non-relational databases.
It expects tabular results. Aside from that I don't think it mandates anything about the design of the underlying system. Certainly it's entirely agnostic about syntactic issues.
For example, it can talk to Excel spreadsheets, via the JdbcOdbc bridge, and Excel is by no stretch of the imagination a relational database. IMS is not a relational database, but that has a JDBC driver.
3. If 2 is true, is there an equivalent of JDBC for non-relational
databases?
2 is not true, and I'm not aware of any "non relational" database connection standard, probably for this very reason. There may well be vendor specific tools for talking to some systems.

For preparing the filenames and paths for the oracle database files..

Hi,
I am preparing the filenames and paths for the oracle database files.....but I am not able to complete this one...Will you Please help for filling this one.
Controlfile ---- > select name from v$controlfile;
Redologfile -- > select member from v$logfile;
Datafile --------- > select tablespace_name,file_name from dba_data_files order by 1;
Tempfile --------> select tablespace_name,file_name from dba_temp_files;
Spfile -----------> show parameter spfile
Pfile --------------->
Passwordfile ---->
tnsnames.ora -->
listener.ora------>
sqlnet.ora ------>
oratab ------------->
Thanks
Shiju

orashiju wrote:
Hi,
I am preparing the filenames and paths for the oracle database files.....but I am not able to complete this one...Will you Please help for filling this one.
Controlfile ---- > select name from v$controlfile;
Redologfile -- > select member from v$logfile;
Datafile --------- > select tablespace_name,file_name from dba_data_files order by 1;
Tempfile --------> select tablespace_name,file_name from dba_temp_files;
Spfile -----------> show parameter spfile
Pfile --------------->spfile and pfile are located under $ORACLE_HOME/dbs/
Passwordfile ----> passwordfile is located under $ORACLE_HOME/dbs
tnsnames.ora -->
listener.ora------>
sqlnet.ora ------>all above files are under $ORACLE_HOME/network/admin
oratab ------------->depends on operating system. Usualy under /etc/oratab

Step-by-step approach for "manual" Oracle Database Migration

Hi All,
I'm looking for a step-by-step approach for "manual" Oracle Database Migration. Basically, the minutes followed in a real-time production DB implementation.
I assume the steps may vary for different setups. However any scenario-based docs will be of great help!

The
Oracle Upgrade Guide
that comes with your download as far as I know is very detailed.

JDeveloper Team: How Do I minimize the number of Oracle Sessions using Data Tags?

I am trying to create a stateful application thru my JSP pages. Everytime there is a reference to the application module using the data tag, it looks like it creates a new Oracle Session. But thats not what I want to do.
I have a module in which my first JSP page allows viewing of the data and in subsequent pages I allow insert, update, delete, commit etc.
My Questions:
1) The problem that I am encountering is that every new page that I go to creates a new Oracle session even though I specify the "Stateful" release mode.
How do I avoid this?
It looks like , if one browser user can potentially create 10-20 oracle sessions thru one module, imagine what the impact will be when we have hundreds of users.
2) The sample JSP pages I saw has the username and password hard coded in it every time. Why? For a stateful application can I not specify the username and password just once and have the other JSP pages use the same userid and password.
What are the pros and cons? I thought if I don't use the username and password in all the JSP pages then it probably will not create additional Oracle sessions but that is not true!!
3) If it creates several Oracle sessions , will it not cause locking problems? If so, How do I minimize locking problems in a stateful application.
JDeveloper Team Please advise!!
AM I missing something? I would appreciate if someone can help me out!
null

Thanks a lot for the information. That thread was indeed very helpful. But it still didn't answer all my questions:
1) In the thread you mentioned, it mostly talks about Web beans. In a jsp page (using Web bean) we need to first invoke setReleaseApplicationResources(true) and then invoke releaseApplicationResources().
Does this apply to data tags? I mean I have a tag <jbo:ReleasePageResources releasemode="Stateful" />. Is this enough to release the application module back to the pool or do I have to have something equivalent of setReleaseApplicationResources(true)?
2. In a stateful application, the state of an application is maintained between requests via a browser cookie. For each browser, you can have one state per application module class. I was attempting to run "several browser sessions from the same machine" and the end result was that I got errors and unpredictable results ie it returned me far fewer rows then I saw originally. Should I be actually be running the browser session from different machines?
3. In JDeveloper Documentation (section About Application Module pooling) there is a note section : "If the application module is not recycled the data stays the same. However if the application module was recycled and then activated through a failover, the activation logic re-executes the view objects, so it may bring in more or less rows then originally seen by the clients due to any database updates that have occured."
This is exactly what is happening to me? How do I get rid of this problem? I want to be able to see all the original rows + any new rows That have been committed. Please advise!
4. Are the JDBC connections tied to application module instances? Is it one JDBC connection per application module instance? So, in a stateful JSP, if I end up using a different application I also get a different JDBC connection. IS this true?
5. Does the no of application module instances depend on the no of available JDBC connections? Because it looks like if you set the max no of connections to "5" and set the max no of application module instances to "10", It will be able to instantiate only "5" application module instances due to the limitation set by connection pool.
6. At times I get errors which indicates that the row in view object does not exist. Is this something familiar? Or is it the same problem that John discussed in his thread.
Thanks in advance!

Using AE(htmldb 2.0) as for reporting tool for other oracle databases.

Maybe I was mistaken, but when I first saw the HTMLDB demo's I saw this as a slick way to build a browser based reporting tool for the masses for quasi-ad-hoc reporting on some of our larger databases that currently have limited reporting capability, and also as a possible replacement for the many MSAccess applets we have.
I just got 2.0 installed and working on a 9i database and went through the basic tutorials, but I can't find much info on how to connect to other oracle databases.
Are my options as follows?:
create dblinks from the local database that houses htmldb to all the other databases?
or
install htmldb schemas on each database I want to access from htmldb?
or
I'll keep looking, but if any of you have any pointers or know of a tutorial that explains the best way to do this it would be greatly appreciated!
tia

As for question 1, yep, that's what I mean. Example:
In a schema in the App Express instance, create a user called "APP1_USER", and then
create view app1_user.people as select * from people@link_user@remotedb
As for the next question, using the built-in insert/update/delete processes will give you
ORA-01461: can bind a LONG value only for insert into a LONG column
among other errors. Apparently version 2.1 will fix this. See Cannot Update VARCHAR column in Remote DB
We address this problem by creating pl/sql APIs for DML, and then writing our own insert/update processes. Slows us down a little, but even with that, App Express remains a productive choice for us.
Another weird problem: auto-row fetch (built-in to HTML DB) doesn't work over db links when you have two columns for a primary key. Many ways around this, e.g. create sequence-populated primary key, create a view with single column that concatenates primary key column values (key1|key2)
Hope this helps!
-John

Can SCAN be used for non 11gR2 databases ?

I am in the processes of database consolidation phase, where in I am consolidating 15 server to a 6 node single Grid for RAC , non -RAC & RAC one node.
I have non -RAC standalone database on NFS mount , visible on all the 6 nodes , idea is to be able to start the db from any node I like for maintenance which I can do with RAC & RAC ONE NODE.
I am planning to run SCAN on 3 node , but the question is, can I use SCAN listener for all the databases ?.
Currently started with a 2 node cluster where I have 11gR2 and couple of RAC one nodes and a 10g rac .
I am able to point to scan LISTENER and able to connect to 10g db , to me SCAN looks very pomissing for our kind of environment where db's can run on any node with out impacting client changes.
Before I present this to the management which I am planning to do This Thursday ( big day for me as I am projecting to save quite a bit of money ).
I don't want to push some thing that's not going to work , even thoug I can prove it now that it works.
And more importantly I have not see a document in google or ORACLE support that says I can nor a sign that any one using for non 11gR2.
How is this SCAN compared to OID or SUN OPEN DS ?

Hi,
generally, SCAN can be used for 10g databases and you discovered the first half: for 10g databases you will have to modify the REMOTE_LISTENER entry for each 10g database instance to point to the SCAN listeners (as opposed to pointing to the remote local listeners, which is the default in 10g). You could even have the databases registers themselves with SCAN and the remote listeners, if you wanted to... It's more or less a matter of configuration. But for simplification reasons, I will stick to the case where you have your 10g databases register with the SCAN listeners only.
Now the other half is the client and the client configuration. An 11g Rel. 2 client configured for RAC would have a TNSNAMES entry that has only one address line for the RAC databases. The host entry in this one address line should point to the SCAN (the SCAN name is ideally resolved in DNS). A 10g client configured for RAC would have as many address lines in the TNSNAMES as you have nodes in the cluster.
The 10g client SCAN configuration would then be in the middle so to speak: You would have 3 address lines in your TNSNAMES, in which each host entry would resolve to one SCAN address (I assume you will use the recommended default of 3 SCAN IPs). If you choose, you can have a name resolution for each of your SCAN IPs, but this would not be required. Now, why would you do it this way? Because this configuration will always work and does not make you dependent on certain functionality that your DNS server may or may not offer.
For the remaining questions: SCAN is a DNS entry resolving one name to more than one (typically 3) IP addresses. OID is short for Oracle Internet Directory, which is a complete LDAP server. And you are right that there is no document how to configure 10g clients for SCAN from Oracle yet. However, there is a quite good document on SCAN on otn.oracle.com/rac, but I am sure you are aware of it already.
Hope that helps. Thanks,
Markus

Jdeveloper Team RE Jdeveloper 9.0.3 For Non-Oracle Databases

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