Connection to Oracle 11g

Similar Questions

• Connection to Oracle 11g with MySQL 5.1

  Hey all,.
  I have searched all over the web for this, and I can't find information that applies to my case. I have an Oracle 11 g DB on a Windows Server 2003 SP2 installer and installing the heterogeneous services ODBC driver. I want to connect it to a different Windows 2003 SP2 machine running MySQL Community.
  
  On the side of the Oracle, I set up the systems to MySQL ODBC connection, and it connects successfully. I also configured tnsnames.ora as follows:
  
  mysqlecommerce =
  (DESCRIPTION =
  (ADDRESS =
  (PROTOCOL = TCP)
  (HOST = dvlps11.cosine.com.cy)
  (PORT = 1521)
  )
  (CONNECT_DATA =
  (SID = mysql_gateway))
  (HS=OK))
  
  I have initmysql_gateway.ora with the following two lines:
  
  HS_FDS_CONNECT_INFO = mysqlecommerce
  HS_FDS_TRACE_LEVEL = ODBC
  
  and I get the following in the listener.ora file:
  
  SID_LIST_LISTENER =
  (SID_LIST =
  (SID_DESC =
  (SID_NAME = mysql_gateway)
  (ORACLE_HOME=C:\Oracle11g\product\11.1.0\db_1)
  (PROGRAM = dg4odbc)
  )
  )
  
  I also created a dblink as follows:
  
  create the 'MYSQLECOMMERCE' of the public database link
  connect to MYSQLDB
  identified by '< pwd >.
  using 'mysqlecommerce ';
  
  Now when I try to run a simple SQL selection such as:
  
  Select 'id_category' ps_category"@mysqlecommerce «»
  
  I get the following response:
  
  ORA-28500: connection between ORACLE and a non-Oracle system has sent this message:
  [MySQL] [ODBC 5.1 Driver] [mysqld - 5.1.36 - community-log] you have an error in your syntax SQL; consult the manual for your version of the MySQL server for the right syntax to use near '' id_category' FROM 'ps_category' A1' at line 1
  
  ORA-02063: preceding 2 lines of DG4ODBC
  
  Can someone please help me understand what is happening?
  
  Thank you in advance!

  The syntax error is caused by your database MySQL does not not in ANSI mode. By default, DG4ODBC sends a code compliant ansi in the foreign database, which means for column sensitive to case and table names it surrounded by double-quotes. MySQL DB not working not in mode compatible ANSI rejects them and uses a back tick to preserve the case - so it reports a syntax error in the case of double qoutes.

  To solve the problem please have a look to My Oracle Support note:
  Problems of selection of data to Mysql using 11.1.0.6 DG4ODBC - error in your SQL syntax [ID 553030.1]

• application forms client side connection problem-oracle 11g Server

  I installed the application oracle 11 g 2 on windows 2008r2 server. Installation of Weblogic. All installations were successful. But when the URL for forms running it prompts for the name of user and password and identification of database information. The application seems to be frozen and we have to refresh and again in the authentication credentials several times to get the application connected to... Please give me a solution for this.

  (Version of Java on the client 1.6.0.25 Client os xp/win7/32/64bits version)

  Tried the solutions are (but failed to solve the problem)

  1. change the browser and the version of the browser.

  2. change the java version.

  3. in the paper of the forms it says error fatal client-side...

  [2013 09-17 T 10: 53:52.073 - 07:00] [WLS_FORMS] [ERROR] [FRM-91230] [oracle. . forms servlet] [tid: 11] [username: < anonymous >] [ecid: 0000K4h3dF95qYWFLzQLOA1IE4TU00009y, 0] [SRC_CLASS: oracle. . forms servlet. ] [RunformProcess] [APP: formsapp #11. 1.2] [SRC_METHOD: fromFrmwebToODL] fatal to the RUNNING process error: timeout on the connection to the Java client]

  Hello, I am writing to inform you all to say that I found the solution. In any case, I saw there were some messages saying to change the version of Java on the client side I made, but did not work. But the solution I've found is as explained below.

  There are some parameters in the Java on your computer to be modified in order to use it.

  • Go to the control panel.
  • Select Java.
  • After the control panel opening Java go to move the tag.
  • Disable the Java plug-in to uncheck 'enable the plugin from new generation... '. ' as shown below
  • Apply the changes and restart the browser.
  • URL will work.
  • Recommended for this IE browser

  Post edited by: LasheenMihik

• Oracle 11g 11.2.0.1 connect to Forms 6i [32 bit] Version 6.0.8.11.3 (Production)

  Hello

  I set up a new server with Windows 8r2. Install Oracle 11 g 64 bit.

  Mounted 10 32-bit Desktop windows forms [32-bit] Version 6.0.8.11.3 (Production).

  I am able to connect to Oracle 9i. but I want to connect to Oracle 11g

  Are there measures where I can solve my problem.

  already had made the following changes to the server

  C:\ > sqlplus/nolog

  SQL > connect / as sysdba

  Conectado.

  SQL > shutdown immediate

  SQL > startup restrict

  SQL > alter database character set internal_use UTF8;

  SQL > shutdown immediate

  SQL > startup

  Under sqlnet.ora I changed

  NAMES. DIRECTORY_PATH = (TNSNAMES, EZCONNECT)

  SQLNET. ALLOWED_LOGON_VERSION_SERVER = 8

  SQLNET. ALLOWED_LOGON_VERSION_SERVER = 8

  SQLNET. ALLOWED_LOGON_VERSION_CLIENT = 8

  I'm still not able to connect.

  Sandy

  1. what error message do you receive forms 6i when you can not connect

  2. what level of Forms 6i patch do you have?  A more recent patch level may be required.

  Tony

• Problem with Oracle 9i and Oracle 11g

  Hello
  I have 2 Installation of Oracle: Oracle 9i client and Server Oracle 11.2
  Oracle 9i to: C:\oraclient9\
  Oracle 11g: C:\app\a.l\product\11.2.0\
  
  I have an application that has to connect to Oracle via ODBC, but whenever I try to connect looking for odbc Oracle 9i and I get this error:
  ORA-12541: TNS no listener
  
  If I try to boot with sqlplus to: start-> run-> sqlplusw get Oracle 9i version
  
  If I'm running sqlplus from start-> program-> Oracle 11-> I can connect properly.
  
  If I try to create a new ODBC it always plug the Oracle version 9i.
  
  I tried:
  Set ORACLE_HOME=C:\app\a.l\product\11.2.0\dbhome_1
  Set ORACLE_SID = ORCL
  
  but when I try: sqlplus / as sysdba I get this error:
  14 error initializing SQL * more
  SP1 file < lang > .msb not found message
  SP2-0750: you may need to set ORACLE_HOME in your Oracle software directory
  
  If I try to boot with sqlplus to: start-> run-> sqlplusw get Oracle 9i version with the error:
  ORA-12541: TNS no listener
  
  Variables environment variables in the path are:
  C:\oraclient9\bin; C:\Program Files\Oracle\jre\1.3.1\bin; C:\Program Files\Oracle\jre\1.1.8\bin; C:\app\a.l\product\11.2.0\dbhome_1\BIN; C:\app\a.l\product\11.2.0\dbhome_1\bin;%SystemRoot%\System32;%SystemRoot%;%SystemRoot%\System32\Wbem;%SystemRoot%\system32\WindowsPowerShell\v1.0\; C:\Program Files\Sybase\SQL Anywhere 9\win32. C:\Program Files\Sybase\Shared\win32; C:\Program Files\Sybase\SQL Anywhere 9\drivers; C:\Program Files\Sybase\Shared\Sybase 4.2 Central; c:\Program Files\Microsoft SQL Server\90\Tools\binn\; C:\Progra~1\XRay
  
  
  
  tnsnames 11g:

  # tnsnames.ora Network Configuration File: C:\app\a.l\product\11.2.0\dbhome_1\network\admin\tnsnames.ora
  # Generated by Oracle configuration tools.
  
  LISTENER_ORCL =
    (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
  
  
  ORACLR_CONNECTION_DATA =
    (DESCRIPTION =
      (ADDRESS_LIST =
        (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
      )
      (CONNECT_DATA =
        (SID = CLRExtProc)
        (PRESENTATION = RO)
      )
    )
  
  ORCL =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
      (CONNECT_DATA =
        (SERVER = DEDICATED)
        (SERVICE_NAME = orcl.domopenplan.local)
      )
    )

  tnsnames 9i:

  # TNSNAMES.ORA Network Configuration File: C:\oraclient9\network\admin\tnsnames.ora
  # Generated by Oracle configuration tools.
  
  ORCL.DOMOPENPLAN.LOCAL =
    (DESCRIPTION =
      (ADDRESS_LIST =
        (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
      )
      (CONNECT_DATA =
        (SERVICE_NAME = orcl.domopenplan.local)
      )
    )

  11g listener.ora:

  # listener.ora Network Configuration File: C:\app\a.l\product\11.2.0\dbhome_1\network\admin\listener.ora
  # Generated by Oracle configuration tools.
  
  SID_LIST_LISTENER =
    (SID_LIST =
      (SID_DESC =
        (SID_NAME = CLRExtProc)
        (ORACLE_HOME = C:\app\a.l\product\11.2.0\dbhome_1)
        (PROGRAM = extproc)
        (ENVS = "EXTPROC_DLLS=ONLY:C:\app\a.l\product\11.2.0\dbhome_1\bin\oraclr11.dll")
      )
      (SID_DESC =
        (GLOBAL_DBNAME = orcl.domopenplan.local)
        (SID_NAME = orcl.domopenplan.local)
        (ORACLE_HOME = C:\app\a.l\product\11.2.0\dbhome_1)
        (PROGRAM = extproc)
        (ENVS = "EXTPROC_DLLS=ONLY:C:\app\a.l\product\11.2.0\dbhome_1\bin\oraclr11.dll")
      )
    )
  
  LISTENER =
    (DESCRIPTION_LIST =
      (DESCRIPTION =
        (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
        (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.2.103)(PORT = 1521))
      )
    )
  
  ADR_BASE_LISTENER = C:\app\a.l

  Do you have any idea how I can create a new ODBC to connect to Oracle 11g?
  
  Thanks in advance!

  opening for the system control window Server DB & question OS command sequence

  lsnrctl status
  set
  lsnrctl service

  COPY orders & results then PASTE all come back here

• Oracle Discoverer 4i (Portal db - oracle 8i) connectivity with database 11g problem

  Hi all

  We have oracle discoverer 4i with Portal db (oracle 8i).

  Connect to external databases by using links in the portal db db and reports will use the link db to retrieve data from views in external databases.

  External databases, we have been connecting is oracle 10g version and now we have improved these databases to version 11g.

  Now I have a created a new database link to this 11g database and I have created a new EUL in the portal to connect to this database 11g.

  But when I try to create a report using the discoverer of this new EUL after login for the discoverer we get an "Unable to connect to the database" error.

  We all have the privilege of necesscary to the user and the new database link works perfectly well. (when we try to query directly using SQL as database portal using this db link the query works perfectly).

  I'm not sure if it is a compatibility issue in accessing an 11g database since oracle disk 4i.

  Can any advise if this is the case and if there is no work around for this?

  Kind regards

  REDA

  You say that you are having problems with a link of database from 8i to 11 g (pl exact position of 4-digit versions)? If so, expect as database of links between these two versions are not supported. Is there a reason you can't pass the portal of databases of at least 10 g 2?

  See MOS Doc 207303.1

  HTH
  Srini

• Oracle 11g no network client machine connects.

  Oracle 11g was installed on windows server 2003.
  
  ORA-12514: TNS:listener is not currently of service requested in connect descriptor . _
  
  We receive oracle above except when you give the following command:
  
  LSNRCTL > services oracle11g_listener
  Connection to (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP) (HOST = CBR-SRV-HPORA. CIBER-INDIA. (IN) (PORT = 1522)))
  _ The listener supports no services
  The command completed successfully.
  
  --------------------------------------------------------------
  
  
  C:\Documents and Settings\oracle > sqlplus scott/tiger@oracle11g_netservice
  
  SQL * more: Production release 11.2.0.1.0 Wed Jul 28 18:10:40 2010
  
  Copyright (c) 1982, 2010, Oracle. All rights reserved.
  
  ERROR:
  ORA-12514: TNS:listener is not currently of service requested in connect
  descriptor of
  
  --------------------------------------------------------------
  
  Please advice what could be the problem.
  
  Thank you.

  Your Lstener knows nothing about services. You must configure the dynamic record of service in your database, for example

  ALTER system set local_listener = "(DESCRIPTION = (ADDRESS =(PROTOCOL=TCP) (HOST = CBR-SRV-HPORA. CIBER-INDIA. IN) (PORT = 1522))) ';

  (for permanent fixing forget pfile or spfile)

  After the database records the address und thie services you will see the service when you ask "srvctl services oracle11g_listener.

  Kind regards
  Dojo

• Oracle 11g remote connection problem

  When I try to connect to the Oracle database using SQLPlus or SQLDeveloper remotely I get the following error.
  
  ORA-01017: INVALID USERNAME/PASSWORD; logon denied.
  
  Server details:
  Oracle 11g on Linux Enterprise 4
  I can connect to the server using SQLPlus.
  SQLCASE SHOW is MIXED
  
  Customer details:
  Windows Server 2003 enterprise Edition
  Oracle 11g Client.
  Remote computer my TNSPING to this server works perfectly.
  
  For the same connection string, I can't connect to the client. I don't know that I type wrong password.
  
  Any thoughts on this will be helpful.
  
  Thank you
  Smith

  If it's a sys user you will need to set the password file to connect to the database as sysdba user remotely. and we do not need to check if the privilege to connect is given to the sys user or not. adding to this remote_login_password check = EXCLUSIVE lock

  Published by: sshafiulla on February 16, 2010 23:17

• Problem with the connection from Oracle to MS Excel - 64 bit

  Hello

  I have problem connecting Excel to oracle 11.2 using DG4ODBC.

  OS - Windows 7 64 bit

  Database version: - Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64 bit

  Created system using ODBC DSN:

  Name of Data Source = test12

  Oracle home path:-D:\app\11g64db\product\11.2.0\dbhome_1

  Contents of the initdg4odbc.ora file:

  # This is an example of initialization file of the agent that contains the HS settings

  # necessary for the database to ODBC gateway

  #

  # HS init parameters

  #

  Test12 = HS_FDS_CONNECT_INFO

  HS_FDS_TRACE_LEVEL = 255

  #

  # Required for the non-Oracle system environment variables

  #

  #set < varenv > = < value >

  Content of listener.ora:

  listener.ora # Network Configuration file: D:\app\11g64db\product\11.2.0\dbhome_1\NETWORK\ADMIN\listener.ora

  # Generated by Oracle configuration tools.

  SID_LIST_LISTENER =

  (SID_LIST =

  (SID_DESC =

  (GLOBAL_DBNAME = live)

  (ORACLE_HOME = D:\app\11g64db\product\11.2.0\dbhome_1)

  (SID_NAME = live)

  )

  (SID_DESC =

  (PROGRAM = dg4odbc)

  (SID_NAME = dg4odbc)

  (ORACLE_HOME = D:\app\11g64db\product\11.2.0\dbhome_1)

  )

  )

  LISTENER =

  (DESCRIPTION =

  (ADDRESS = (PROTOCOL = TCP)(HOST = localhost) (PORT = 1521))

  )

  ADR_BASE_LISTENER = D:\app\11g64db

  Content of tnsnames.ora:

  tnsnames.ora # Network Configuration file: D:\app\11g64db\product\11.2.0\dbhome_1\network\admin\tnsnames.ora

  # Generated by Oracle configuration tools.

  excel_test =

  (DESCRIPTION =

  (ADDRESS = (PROTOCOL = tcp)(HOST=localhost) (PORT = 1521))

  (CONNECT_DATA = (SID = dg4odbc))

  (HS = OK)

  )

  SCREW =

  (DESCRIPTION =

  (ADDRESS = (PROTOCOL = TCP)(HOST = localhost) (PORT = 1521))

  (CONNECT_DATA =

  (SERVER = DEDICATED)

  (SERVICE_NAME = live)

  )

  )

  Status of the listener

  LSNRCTL for 64-bit Windows: Version 11.2.0.4.0 - Production on August 29, 2014 13:56

  : 11

  Copyright (c) 1991, 2013, Oracle.  All rights reserved.

  Connection to (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST=localhost) (PORT = 1521)))

  STATUS of the LISTENER

  ------------------------

  Alias LISTENER

  TNSLSNR for Windows 64-bit version: Version 11.2.0.4.0 - Prod

  ction

  Start date August 29, 2014 13:34:58

  Uptime 0 days 0 h 21 min 12 sec

  Draw level off

  Security ON: OS Local Authentication

  SNMP OFF

  Listener parameter File D:\app\11g64db\product\11.2.0\dbhome_1\network\admin\l

  istener.ora

  Listener log file D:\app\11g64db\diag\tnslsnr\Est-Subramanya\listener\al

  ert\log. XML

  Summary of endpoints listening...

  (DESCRIPTION = (ADDRESS = (PROTOCOL = tcp)(HOST=127.0.0.1) (PORT = 1521)))

  Summary of services...

  Service "dg4odbc" has 1 instance (s).

  "Dg4odbc" instance, status UNKNOWN, has 1 operation for this service...

  Service 'live' has 2 occurrences.

  Instance of "live" status UNKNOWN, has 1 operation for this service...

  Instance of "live" READY State, has 1 operation for this service...

  Service 'visXDB' has 1 instance (s).

  Instance of "live" READY State, has 1 operation for this service...

  The command completed successfully

  DB Link:

  CREATE DATABASE LINK PUBLIC TEST123 USING 'excel_test ';

  error when querying of data:

  Select * from test@test123;

  ORA-28500: connection between ORACLE and a non-Oracle system has sent this message:

  ORA-02063: preceding line TEST123

  28500 00000 - "connection between ORACLE and a non-Oracle system has sent this message:

  * Cause: The cause is explained in the forwarded message.

  * Action: See documentation for the non-Oracle of the transmission system

  Message.

  Error on line: 1 column: 20

  Appreciate the help in advance...

  Thank you...

  This problem is solved. It was because of the excel 12.0 version when creating data source in administrative tools.

  Thank you.

• How to get more information about the users in oracle 11g

  Hi all
  
  I need to know more information on users in oracle 11g.
  
  1. how to check when user times last connection to the database.
  2. If the user account is blocking why it is blocked? If it is locked trying Loing with wrong password how to check how many times he tried with wrong password... and other reasons also
  3 reaction strives to select user expire date is to show the value empty... we can check expire date by querys or we need to check the profile?
  4. how to check while he was reset his password, the last time.
  
  Please correct me if am wrong. Thank you
  
  Concerning

  1. how to check when user times last connection to the database.

  AUDIT

  2. If the user account is blocking why it is blocked? If it is locked trying Loing with wrong password how to check how many times he tried with wrong password... and other reasons also

  Check the profile of this user and attr.

  3 reaction strives to select user expire date is to show the value empty... we can check expire date by querys or we need to check the profile?

  SQL> select EXPIRY_DATE from dba_users ;
  
  EXPIRY_DA
  ---------
  24-SEP-11
  24-SEP-11
  24-SEP-11
  24-SEP-11
  24-SEP-11
  24-SEP-11
  24-SEP-11
  23-MAY-13
  24-SEP-11
  24-SEP-11
  24-SEP-11
  

  check
  EXPIRY_DATE in dba_users is null

  4. how to check while he was reset his password, the last time.

  SELECT SYS PTIME. THE USER$;

• OBIEE 10.1 with Oracle 11g

  10 OBIEE can work with Oracle 11 g?
  
  I installed OBIEE 10 g on my laptop (window Home premium Vista)
  
  I then installed Oracle database 11g (desktop version)
  
  When I tried to import the database into the administrator create a repository, I provided the connection string for oracle 11g, but it gave me following error
  
  Failed to load c:\OracleBI\Server\bin\nqsdbgatewayoci10g.dll dll. Check if the database Oracle 10 g client is installed.
  
  Edited by: 967447 November 30, 2012 07:12

  Try to reinstall or install the Oracle client with advanced features. That solved your problem.

  OR
  1.uninstall/remove the previous 64 Bit JDK, 64-bit Oracle Client and OBIEE
  2. download and install the 32 Bit JDK and the 32 Bit Oracle 11 G client
  3 reinstall OBIEE OTM Administrator Guide

  Appreciate if you mark as correct

• Oracle 11g EM

  Hello
  
  I have Oracle 11g on Win2k8 server. I thnk I can accidentally removed the Oracle EM service in windows.
  
  Is there a way to create again, prefeby without recreating the EM repository?
  Manually create the windows service back?
  
  Thanks in advance.

  Here's the problem of the listener. Your listener is listening on port 1521

  C:\Users\Administrator>lsnrctl status
  
  LSNRCTL for 32-bit Windows: Version 11.1.0.7.0 - Production on 09-JAN-2012 16:15
  :51
  
  Copyright (c) 1991, 2008, Oracle. All rights reserved.
  
  Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=xx.xxx.x.xxx)(PORT=1521)
  ))
  STATUS of the LISTENER
  

  considering that when configuring dbcontrol, you provided the listening port 5501

  Enter the following information:
  Database SID: xxxx
  Listener port number: 5501
  Password for SYS user: 36914
  Password for SYSMAN user: 903
  

  Salmabn

  Published by: Salman Qureshi on January 9, 2012 18:09

• IMPDP-problem with Oracle 11g XE

  Hello
  I am trying to import a dump file of the Oracle 11 g R2 database Oracle 11 g XE. I created the directory and everything starts very well. But after a few seconds, impdp stops with the following error message:
  
  C:\users\administrator > impdp dumpfile = exp_full.dmp IMP_DIR = system directory
  
  Import: Release 11.2.0.2.0 - Production on Dez Di 27 11:27:33 2011
  
  Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved.
  Password:
  
  Connected to: Oracle Database 11g Express Edition Release 11.2.0.2.0 - Production
  
  UDI-31626: operation there was error ORACLE 31626
  ORA-31626: there is no job
  ORA-39086: cannot retrieve information about jobs
  ORA-06512: at "SYS." DBMS_DATAPUMP', line 3326
  ORA-06512: at "SYS." DBMS_DATAPUMP', line 4551
  ORA-06512: at line 1
  
  Somebody has seen this before or anyone able to help out me? I tried SYS, SYSTEM connection and also tried complete imports or only certain schema imports, with no luck.
  
  Best regards
  
  Jürgen

  Edition and version (full version in five characters please, not marketing label) source of database export?

  The impdp session produced something else? What does the last lines of the log output to say, other than what is posted above?

  What happens if you export and import the specific schema only?

  Also:
  Impdp help = y

  Search the description for the EXCLUDE parameter.

  Published by: orafad on December 27, 2011 13:10

• Oracle 11g with problem of pdf cocoon.war and glassfish?

  Hi all
  I m install oracle 11g express on CentOS OS, oracle apex earphone 1.1.2.131.15 5.6
  GlassFish v2 and cocoon 2.1.11 and connect to oracle apex glasfish works very well
  
  Problem start when I had cocoon xml build and deploy cocoon.war on glassfish,
  addition of fop_post on cocoon/fop_post (as described on http://carlback.blogspot.com/2007/03/apex-cocoon-pdf-and-more.html) but the pdf don't work!
  
  (I've been putting all the steps on the machine of 11.2 to 32-bit suse and ubuntu 8.04 - 32 bytes and pdf open work well)
  Y at - he no idea what happen whith this pdf error?
  Is the problem with 64 bytes some specific parameters, with java jdk, Cocoon, glassfish, or something on apex of oracle 11g?
  
  Gordan
  
  Published by: useruseruser on June 20, 2011 21:49

  Hi Gordon,.

  Once again, great to hear that!
  Could you rent close this thread and mark any post useful or correct if your question is answered?

  Thank you

  Udo

• alias disappear in oracle 11g, while it worked fine in 10.2.0.4

  SQL@10G > select * from v version $;
  
  BANNER
  ----------------------------------------------------------------
  Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bi
  PL/SQL Release 10.2.0.4.0 - Production
  CORE 10.2.0.4.0 Production
  AMT for IBM/AIX RISC System/6000: release 10.2.0.4.0 - production
  NLSRTL Version 10.2.0.4.0 - Production
  
  5 selected lines.
  
  SQL@10G > select xmlelement ('a', (select xmlelement ("c", model) of the double) as "xml b") .getStringVal () from dual;
  
  XML
  ------------------------------------------------------------------------------
  < a > < b > < c > X </c > < / b > < / a >
  
  1 selected line.
  
  SQL@10G > connect
  Connected.
  
  SQL@11g > select * from v version $;
  
  BANNER
  ------------------------------------------------------------------------------
  Oracle Database 11 g Enterprise Edition Release 11.2.0.1.0 - 64 bit Production
  PL/SQL Release 11.2.0.1.0 - Production
  CORE 11.2.0.1.0 Production
  AMT for IBM/AIX RISC System/6000: Version 11.2.0.1.0 - Production
  NLSRTL Version 11.2.0.1.0 - Production
  
  5 selected lines.
  
  SQL@11g > select xmlelement ('a', (select xmlelement ("c", model) of the double) as "xml b") .getStringVal () from dual;
  
  XML
  ------------------------------------------------------------------------------
  < a > < c > X </c > < / a >
  
  1 selected line.

  do not be distracted by the scalar query online here. The example of the real world is a result of 0 - many in the online display

  No matter how many lines online see returns, as aggregate you them the result is always a scalar value (an instance of xmltype).

  Now the item is returned, even if there is no lower-level data

  Ok.

  XMLForest function works the way you want.
  You can try this (I don't yet have a 11.2)?

  SELECT xmlelement("topElement",
           xmlforest(
            (
              select xmlagg(
                       xmlelement("object",
                         xmlattributes(object_id as "objectId", object_type as "object_type")
                       )
                     )
              from all_objects
              where object_name = 'XDUAL'
            ) as "objects"
           )
         ).getStringVal() xml
  FROM dual;
  

  It should give a correct output with any version.

  Published by: odie_63 on 1 July. 2010 11:25