Creating second instance 10g (non rac)

We are 10G 64bit on a Windows/VM box - or will be:)
Is it possible to create multiple instances of oracle on a single server?
Generally speaking - would I create the second instance just like the first instance but with a different db name?
Any reasons why I wouldn't want to create multiple database instances on the same server?
Currently we have our client (enterprise manager) installed on a separate box and use the same client to connect to several databases. If I had multiple instances on one server how would enterprise manager connect to multiple instances with the same ip?
Thanks for taking my question!.
Kathie

When running the second DBCA the global database name and sid would be unique as well?Yea, the global database name must be unique.
I could also use the same flashback directory as this area has the sid in the directory path? Yea, you can use the same flashback directory for any database on the same server.
Forum question: Is there a way to close a question and give credit for an answer? I dont, know, but the interesting about the participation on this forum is HELP
Luck.
Have a good day.
Regards.

Similar Messages

Partial Restoration of Tablespace from RAC instance to non-RAC instance

when i am trying to restore tablespace from RAC environment to Non-RAC i got below error in my log
channel aux1: starting datafile backup set restore
channel aux1: restoring control file
channel aux1: reading from backup piece c-1840232663-20110405-01
channel aux1: ORA-19870: error while restoring backup piece c-1840232663-20110405-01
ORA-19507: failed to retrieve sequential file, handle="c-1840232663-20110405-01", parms=""
ORA-27029: skgfrtrv: sbtrestore returned error
ORA-19511: Error received from media manager layer, error text:
sbtrestore: Job[0] thread[18841]: InitializeCLRestore() failed.
kindly revert,
Thanks & Regards,
MJ

I am not sure what you mean by "OS replication".
Whether you use RAC or a Failover Cluster, the database has to be on Shared Storage (which requires no "replication").
RAC licence costs are higher than that for a Failover Cluster because both instances have to licenced and the RAC option has to be purchased.
Of course, if the two nodes together are limited to 4 CPUs, you could consider Standard Edition to reduce the licencing costs.
DBA skills requirements are also higher for RAC.
With respect to your question "...will be sufficient for the avaialability purposes" it really depends on what your requirements are. People use RAC for Avaialability when it really is better positioned for Scalability. If you want only availability and can afford a few minutes downtime, and each node in the cluster can individually handle the user/batch loads, a Failover Cluster would suffice.
I suggest that you raise this question in the "Database - General" forum : General Database Discussions
or the "Real Application Clusters" forum : Real Application Clusters
"Replication" is the wrong forum for such a question.
When you do re-raise your question, please clarify your understinding of "OS replication".
Hemant K Chitale
Hemant K Chitale

Create a second instance by DBCA

I have a simple RHEL3 box with 1 G memory, I had used the DBCA to install a database, 10g r2, on it. How can I use the DBCA to create a second instance on the same DB? Someone´s thread said it can, But when I run the dbca, there is no place I can pick to create second instance, all I have is to create another database and next. My oracle was 10g r2 (10.2.0.1) SE1 version downloaded from Oracle. Is a problem with my original download copy or setup of the dbca? Thx.
Chi

Thanks Kuljeet. I think I missed that part of fundamentals. So how about the second schema vs second instance? Some users said that the second instance will need more overhead for oracle structure. and many experienced users said that second schema on the same instance is bad idea. The reason I want is to separate the test part of the database operation to a second environment (not sure it is a good word). So the management of Oracle will be simpler. My 10g r2 is part of BAAN erp application, BAAN uses Oracle as a data/index storage only, Most of the processes is around running SELECT, UPDATE and INSERT sql (developed from BAAN´s 4G script). No procedure, no function, no trigger or any other involved. However, during the set-up of the BAAN, contractor created a test set of database, then repeated the data/index tables to a prod set. So that our BAAN users can test some processes and move that processes to prod.

How to upgade Oracle from 9.2 on SUN to Oracle 10g R2 RAC on Oracle EL4

Hi all,
I have production database Oracle 9i EE Release 9.2.0.5.0 - 64bit on SunOS 5.9 cca 100GB. I would like to upgrade Oracle 10g Relase2 RAC with 2 nodes on Oracle Enterprise Linux. Database availability is 24x7 and system breakdown must be minimal. Upgrade could be done in several independent steps. What is the best form of upgrade realisation?
Thx for some idea
Libor Veverka
[email protected]

My 2 cents:
1. de-RAC 9i on solaris
2. upgrade to 10g on solaris (why? take advantage of datapump, much faster than exp/imp)
3. expdp from 10g solaris
4. create single instance 10g on linux
5. impdp on linux
Please note there are a number of issues with 9ir2.10gr2 upgrade (check metalink for details).
HTH,
[email protected]

Which file decide instance name in RAC 10g ?

Which file decide instance name in RAC 10g ?
How does RAC know which instance should start from which machine?
Thanks.

The spfile is NOT the correct answer, actually.
1. The instance name for any Oracle instance, whether in a RAC or not, is derived from the value for the ORACLE_SID parameter which is in force at the time the startup command is issued. If you were to:
export ORACLE_SID=SALES
sqlplus / as sysdba
startup...you would just have created an instance called SALES.
2. The spfile (or init.ora if you're not using an spfile) contains a parameter called INSTANCE_NAME. That defaults to whatever ORACLE_SID is set to as an environment variable when the instance is started, hence point 1 above. But you can force an instance to acquire a non-SID name by deliberately setting it to something different. That's unusual to do, though, except in a RAC context where you want to subvert the default load balancing mechanism.
2b. The spfile (or init.ora) also contains a parameter called DB_NAME -but that is the name of the database, not the name of the instance, and is therefore irrelevant for the purposes of working out how instances get their names,
3. Neither of the above answers has got anything to do with RAC knowing what instance runs on which machine. That is the job of the Oracle Cluster Registry file (OCR), for which you have to provide about 100MB of space on a shared hard drive during the RAC installation itself.
You populate that file by running DBCA to create your RAC instances (and DBCA then automatically updates the OCR to record the fact that it created instance X1 on Node A and X2 on Node B, and therefore that's what will happen in the future unless you change things).
Or you can update the OCR yourself by using the SRVCTL utility. You'd do something like: srvctl add instance -d DB1 -i X3 -n C (add an instance called X3 to run on Node C as part of database DB1).
A little more details about the OCR is available in Section 13 of this article, for example: http://www.dizwell.com/prod/node/26?page=0%2C5

Can I use data guard to create a RAC standby database for a non RAC primary

Hi,
we need to RAC our production database but the normal methods will mean a long outage. It is possible to create a standby as a single node RAC database and when ready do a graceful failover to the standby database and open it for business. The next step would be to create another RAC node from this on the original server.
servers are already cluster aware, using ASM etc
Oracle 10.2

Yes, you will be able to setup RAC stnadby for a non-RAC Primary. For primary it just needs a available destination for redo shipping it doesn't matter whether it's RAC enabled or not. And ofcourse you are using 10.2 anyway only one node will be running MRP and that is too in standby mount mode.
However since you have are using You may follow below sequence.
1. Setup a new standby as RAC enabled.
2. Perform a switchover.
3. Shutdown the Old primary (which is standby now).
4. Install CRS and RDBMS on the old primary and it's new node.
5. Modify the cluster_database=TRUE and cluster_database_instances=<required number of instances>.
With above modification mount the standby database in standby mode and start MRP.
6. Introduce the database and instances to the OCR using SRVCTL add command.
7. Once you your database is synchronized with Primary do a switchover.
9. Now you can repeat step 3 to 6 on the other site too. <- if you need your secondary site to be RAC enabled too
10. Finally both the sites should be RAC enabled.
Hope this is helpful!!!
Thanks,
Asif Haliyal

How to create second database at ASM in 4 node RAC system

Hi Experts,
we use 4 nodes RAC (11.0.1) with 10.2.0. 4 database in red hat5.0
we want to add second database at ASM in RAC system based on manager decision.
how do I add second database in ASM with exist database?
Do I need to created new ASM insatnce?
how to create two new diskgroup? is it under existing ASM instance or new ASM instance?
how to reset ASM properity to support ( or new) ASM instance and two database?
Do I need to configure AMS again after added more space into ASM?
I could not find ducument that add seconf database into ASM in RAC system.
I want add second database by dbca. any experience for add second database in ASM RAC ?
Thanks for help!
JIm

Hi... I'm in the same situation.
I need to add a new second database on a RAC installation based on already available ASM instance.
I'm using 11gR2.
I read your suggested documentation. Then I typed asmca and analyzed my asm configuration:
As you can see I have a DISK GROUP NAME with several FREE space.
!http://img522.yfrog.com/img522/8405/dbca20100203173248.jpg!
If I select Volumes tab the following is my current configuration:
!http://img682.yfrog.com/img682/562/dbca20100203173343.jpg!
Selecting Create button, I can insert some values as you can see:
!http://img403.yfrog.com/img403/9889/dbca20100203173403.jpg!
First question:
Is this the right way to create space for a new database ? Consider that running dbca.. no DISK GROUP NAME is available.
Second question:
When I created my first database on this DISK GROUP NAME no volumes were created. Why now I have to do it ? Is this necessary to really separate datafiles coming from different databases ?

Unable to create ASM instance in Sol 10 with oracle 10g

Hi
I am trying to create ASM instance in oracle 10g, getting an error will try to add localconfig add command
"bash-3.00# /export/home/oracle/oracle/product/10.2.0/db_1/bin/localconfig add reset
Failure at scls_scr_create with code 1
Internal Error Information:
Category: 1234
Operation: scls_scr_create
Location: mkdir
Other: Unable to make user dir
Dep: 2
Successfully accumulated necessary OCR keys.
Creating OCR keys for user 'root', privgrp 'root'..
Operation successful.
Configuration for local CSS has been initialized
Adding to inittab
/etc/init.d/init.cssd: /var/opt/oracle/scls_scr/Sun/root/cssrun: cannot create
Startup will be queued to init within 30 seconds.
Checking the status of new Oracle init process...
Expecting the CRS daemons to be up within 600 seconds.
Giving up: Oracle CSS stack appears NOT to be running.
Oracle CSS service would not start as installed
Automatic Storage Management(ASM) cannot be used until Oracle CSS service is started "
initcssd has been installed and unable to start also getting an error
# svcs -x svc:/system/initcssd:default
svc:/system/initcssd:default (system activity reporting package)
State: maintenance since Wed Nov 16 10:39:29 2011
Reason: Start method failed repeatedly, last exited with status 2.
See: http://sun.com/msg/SMF-8000-KS
See: sar(1M)
See: /var/svc/log/system-initcssd:default.log
Impact: This service is not running.
Can some please help me to create this instance, alos need a initcssd.zip file for 10g

Hi thanks,
I have passed more steps, CSS is started after changing the hostname, after that I created two drive and mounted properly
when I try to create a ASM disk its failing with following error and idea
SQL> CREATE DISKGROUP DB_DATA NORMAL REDUNDANCY
2 FAILGROUP controller1 DISK '/dev/dsk/c0d1s0'
3 FAILGROUP controller2 DISK '/dev/dsk/c1d1s0';
CREATE DISKGROUP DB_DATA NORMAL REDUNDANCY
ERROR at line 1:
ORA-15018: diskgroup cannot be created
ORA-15031: disk specification '/dev/dsk/c1d1s0' matches no disks
ORA-15025: could not open disk '/dev/dsk/c1d1s0'
ORA-15056: additional error message
Intel SVR4 UNIX Error: 13: Permission denied
Additional information: 42
Additional information: 134497888
Additional information: -809278080
ORA-15031: disk specification '/dev/dsk/c0d1s0' matches no disks
ORA-15025: could not open disk '/dev/dsk/c0d1s0'
ORA-27037: unable to obtain file status
Intel SVR4 UNIX Error: 25: Inappropriate ioctl for device
Additional information: 16
Additional information: 134497888
Additional information: -809278080

How to create a standby redolog from rac to non rac ??

Hi,
How to create a standby redolog from rac to non rac DR setup..???
in rac we can create with specifying thread number for each instances..... but this will be replicating to standby ....so how this will act/create on single DR??
pls help

854393 wrote:
Thanks Shivanandha,
(maximum number of logfiles for each thread + 1) * maximum number of threads
Using this equation reduces the likelihood that the primary instance's log writer (LGWR) process will be blocked because a standby redo log file cannot be allocated on the standby database. For example, if the primary database has 2 log files for each thread and 2 threads, then 6 standby redo log file groups are needed on the standby database.In maximum performance mode you can keep same number of redo logs but having one more redo log member for each thread is recommended and mandtory for other protection modes.
How to create a standby redolog from rac to non rac DR setup..???
in rac we can create with specifying thread number for each instances..... but this will be replicating to standby ....so how this will act/create on single DR??pls help
Yes, even your DR is RAC or non-RAC, you must have both threads, because each instance information exist on own thread, So to perform redo transition from both the instances, you must have both standby redo log threads even though if it is non an RAC DR.
Hope This helps.

Second instance RAC startup problem

Oracle 9.2.0.4 on RH AS 2.1.
I have started up the node1 instance well.
I have added the second thread (and second tablespace) for instance 2 (in node2).
SQL> alter database add logfile thread 2
2 '/opt/orafiles/test/redo03.log' size 10m,
3 '/opt/orafiles/test/redo04.log' size 10m;
SQL> alter database enable public thread 2;
But whe I try to startup the instance 2 (in node2) I get the following error;
SQL> startup
ORACLE instance started.
Total System Global Area 131143096 bytes
Fixed Size 452024 bytes
Variable Size 92274688 bytes
Database Buffers 37748736 bytes
Redo Buffers 667648 bytes
Database mounted.
ORA-00305: log 3 of thread 2 inconsistent; belongs to another database
ORA-00312: online log 3 thread 2: '/opt/orafiles/test/redo03.log'
Any idea?

How did you create the 2nd instance? If you go through the DBCA and add an instance to the RAC database, then you can create your redo log files there.
Just from the information provided, it looks like you're trying to start the 2nd instance using redo logs that belong to the RAC database (and the 2nd instance isn't part of the RAC database)...but I can't see what you did before the add logfile action.

Open 10g/11g RAC database in Non RAC Mode

Dear Friends,
How i open 10g and 11g RAC database in Non RAC Mode (open single instance in order to perform upgrade)
Later i will convert the upgraded DB to RAC DB
Regards,
DB

user564706 wrote:
Dear Friends,
How i open 10g and 11g RAC database in Non RAC Mode (open single instance in order to perform upgrade)
Later i will convert the upgraded DB to RAC DB
Regards,
DBEdit spfile and set cluster_database=false before starting database in upgrade mode(optionally you can unset other cluster parameters).
So you upgrade using only 1 instance of database.
Once the upgrade is finished start the other instance as well and set cluster_database=true
Also see preupgrade process - http://docs.oracle.com/cd/E11882_01/server.112/e23633/upgrade.htm#i1011979
Post upgrade -> http://docs.oracle.com/cd/E11882_01/server.112/e23633/afterup.htm#CEGCFJJC

Using RMAN to create single instance standby from 2 node rac

Any advice on the RMAN command to take a non catalog full rman backup from a two node 11gr2 rac node and use it to create the STANDBY single instance.
The RAC two node instance is in ASM (Linux)
The Physical Standby is Normal File System (Linux)
The command that I get from Metalink suggests:
rman target sys/passwd@primary catalog RMAN/RMAN@RMAN auxiliary sys/passwd
RMAN> run {
allocate auxiliary channel C1 device type disk;
duplicate target database for standby;
When I took the rman backup I did not use catalog. Please suggest how to accomplish the same task without catalog. Thanks

Listener.ora
SID_LIST_STANDBY_LSNR =
(SID_LIST =
(SID_DESC =
(GLOBAL_DBNAME = KEMETRAC.respecti.com)
(SID_NAME = STANDBY)
(ORACLE_HOME = /u02/standby/11.2.0.3/STANDBY)
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = /u02/standby/11.2.0.3/STANDBY)
(PROGRAM = extproc)
ADR_BASE_STANDBY = /u02/standby/11.2.0.3
TRACE_LEVEL_STANDBY = OFF
STANDBY_LSNR =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = standby.respecti.com)(PORT = 2012))
LOGGING_STANDBY = OFF
...... Tnsnames.ora
STANDBY.RESPECTI.COM,STANDBY =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = standby.respecti.com)(PORT = 2012))
(CONNECT_DATA =
(SERVICE_NAME = STANDBY.respecti.com)
KEMETRAC1.respecti.com, KEMETRAC1 =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = rac1-vip.respecti.com)(PORT = 2012))
(CONNECT_DATA =
(SERVICE_NAME = kemetrac1.respecti.com)
KEMETRAC2.respecti.com, KEMETRAC2 =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = rac2-vip.respecti.com)(PORT = 2012))
(CONNECT_DATA =
(SERVICE_NAME = kemetrac2.respecti.com)
# TAF 2 Node RAC
KEMETRAC.respecti.com, KEMETRAC =
(DESCRIPTION =
(ADDRESS_LIST =
(FAILOVER = ON)
(LOAD_BALANCE = ON)
(ADDRESS = (PROTOCOL = TCP)(HOST = rac1-vip.respecti.com)(PORT = 2012))
(ADDRESS = (PROTOCOL = TCP)(HOST = rac2-vip.respecti.com)(PORT = 2012))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = kemetrac.respecti.com)
(FAILOVER_MODE =
(TYPE = SELECT)
(METHOD = BASIC)
(RETRIES = 180)
(DELAY = 5)
The Standby has been started up with nomount.
standby> rman target sys/[email protected] auxiliary sys/pw
Recovery Manager: Release 11.2.0.3.0 - Production on Wed Jan 18 18:16:46 2012
Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.
connected to target database: KEMETRAC (DBID=1448030790)
connected to auxiliary database: KEMETRAC (not mounted)
RMAN>
RMAN> run {
2> duplicate target database for standby from active database dorecover nofilenamecheck;}
Starting Duplicate Db at 18-JAN-12
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of Duplicate Db command at 01/18/2012 18:23:06
RMAN-05501: aborting duplication of target database
RMAN-06217: not connected to auxiliary database with a net service name
RMAN>

How convert database RAC to Non-RAC 10g

Hi, How convert database RAC to Non-RAC 10g, i'm use Oracle Cluster Filesystem.
Thanks for your help.

Hi, i made a little lab and i found the solution, i share with you a quick procedure.
1.- Create a copy of parameter file and delete clusters parameters.
cluster_database=false,etc, etc.
Note. Add the parameter
norecovery_through_resetlogs=TRUE
2.- Create the backup of controfile.
connect / as sysdba
alter database backup controfile to trace;
3.- Stop the cluster database and make the copy to new server.
srvctl stop database -d myrac
scp * new_server:/new_path
4.- Create the password file and init file into the new server
5.- Start the database with nomount option
connect / as sysdba
startup nomount
6.- Create the controlfile and set the new database name and new paths for oracle files.
7.- Open the database with resetlogs option
alter database open resetlogs;
Thanks for your help.
Luck
Regards.

How do I create a second instance of oc4j in a standalone enviroment

I am using OC4J standalone to deploy a sparql endpoint using jena, joseki, and the oracle jena adaptor. OC4J is running on the same server as my DEV and QAR databases. The current instance of OC4J is using a data source called "OracleSemDS" to connect to my DEV database. We are now ready to migrate the endpoint to QAR. As I was setting up the QAR endpoint, I discovered the the jena/joseki tools are hard-coded to use the "OracleSemDS" data source. Therefore, I cannot have 2 endpoints running in the same OC4J instance where one points to DEV and the other points to QAR.
Therefore, I need to create a second instance of OC4J that specifies QAR as the "OracleSemDS" data connection. Can someone tell me how to do that?
Thanks,
Phil

jphilb wrote:
I am using OC4J standalone to deploy a sparql endpoint using jena, joseki, and the oracle jena adaptor. OC4J is running on the same server as my DEV and QAR databases. The current instance of OC4J is using a data source called "OracleSemDS" to connect to my DEV database. We are now ready to migrate the endpoint to QAR. As I was setting up the QAR endpoint, I discovered the the jena/joseki tools are hard-coded to use the "OracleSemDS" data source. Therefore, I cannot have 2 endpoints running in the same OC4J instance where one points to DEV and the other points to QAR.
Therefore, I need to create a second instance of OC4J that specifies QAR as the "OracleSemDS" data connection. Can someone tell me how to do that?
Thanks,
Philgday Phil -- Melli Annamalai from the Oracle Server PM team pointed me to your question. I was an OC4J Product Manager before we bought out BEA and I swapped over to WLS -- so I have some information below that hopefully is of assistance to you.
Since you are using OC4J standalone, the simplest way to get a second instance, is to just clone the existing, whole directory structure of your working OC4J instance into another directory, and configure/run it from that directory. To map the OracleSemDS to another target (QAR) you change the data-sources.xml file in the second instance. If you want to run them concurrently on the same server, you'll need to change the ports in the second instance so they have unique values: default-web-site.xml, rmi.xml, internal-settings.xml, jms.xml. These additional ports can be specified on the command line as a Java property string, albeit this is not a documented nor supported feature. See http://buttso.blogspot.com/2007/02/specifying-oc4j-standalone-ports-from.html for more information.
Now as an example, assuming you have your OC4J you want to clone in the dev directory, and now want to create a second instance of OC4J in qar, I'd do this:
cp -rp dev/* qar
cd qar/j2ee/home/config
vi data-sources.xml
(edit any other files if needed to alter ports) ...
cd ..
java -jar oc4j.jar That should work, and should create the second instance using the current configuration (ie dev) as its basis (including deployed apps). Of course, you'll need to manage them independently from here as they really are just two separate OC4J standalone instances.
Now what else you could potentially do is to create a secondary configuration file subset only which only changes the necessary files to support running the second instance. In this case, you'd make a copy of the j2ee/home/config/server.xml, j2ee/home/config/application.xml and j2ee/home/config/data-sources.xml files, renaming them to qar-server.xml, qar-application.xml and qar-data-sources.xml.
Then do the following:
1. In qar-server.xml file, you'd change the global-application application to point at qar-application.xml instead of application.xml:
<global-application name="default" path="qar-application.xml" parent="system" start="true" />
2. Change qar-application.xml so that it used the qar-data-sources.xml file:
<data-sources path="qar-data-sources.xml" />
3. Change qar-data-sources.xml file so it points to the qar database target.
4. Start OC4J, telling it to use qar-server.xml instead of the default server.xml
D:\java\oc4j-10135-prod\j2ee\home>java -jar oc4j.jar -config config/qar-server.xmlI think you could run into some concurrency problems if you try and run the two instances simulataneously, but in general it should be OK I think if you run them separately.
Another solution here is look at how the application specifies/uses datasources. The hard coding of the data-source name into the applicaiton via a direct JNDI lookup works, but restricts the flexibility you as a deployer/administrator has.
If the application used the Java EE resource-ref approach to look up and use the datasource, then the actual JNDI name of the datasource the application uses it totally abstracted from the actual physical name of the datasource that is created on the container -- so you'd have DEVDS and QARDS as physical datasources configured and running on OC4J -- and what happens is that as you deploy the application, you essentially map its lookup and use of OracleSemDS (which would need to change to a java:env/ namespace) to the physical datasource you want it to use (DEVDS or QARDS for example). You can easily alter this post deployment by changing the generated orion-application.xml file to point at the alternate physical datasource. Following that, you can also create separate deployment plans which map the app to the different datasources, then feed this in with the deployment operation so that the correct mapping to either DEVDS or QARDS is done during the deployment process.
I don't know what scope you have to change the application so the above may not be possible -- you'd need to change the lookup code so that it uses the Java EE reference model and change the meta-inf/application.xml to add the corresponding resource-ref entry which declares the logical datasource name that needs to be mapped on deployment.
Another approach here may be to use an application embedded datasource, where you put a data-sources.xml file into the application archive itself (along with an orion-application.xml file which references it) whereupon at deployment time, a datasource specific to the application will be created. In this manner, you'd have say two copies of the same application to deploy (DEV, QAR) which contain different data-sources.xml file. From memory, each application will have its own JNDI namespace so their datasources can co-exist with the same names, with application level data-sources overriding server level ones. Since you'll most likely want to keep the same context-root for the web modules (which has to be unique per server) you'll generally need to run just one of the applications at a time. I'd do this like this: deploy one, stop it, deploy the other, stop it, then start only the one you need to test. In that way, you'll have one copy of the application running (either DEV or QAR) and one datasource definition running within it.
Here's some documentation links to get you going:
Managing Application Lifecycle (start, stop): http://download.oracle.com/docs/cd/E14101_01/doc.1013/e13978/adminclient.htm#BABHJAFE <-- describes admin_client.jar but general principles apply to ascontrol management of application.
Packaging and Testing Applications: http://download.oracle.com/docs/cd/E14101_01/doc.1013/e13979/packag.htm#BHCFBEEC
Application Level DataSources: http://download.oracle.com/docs/cd/E14101_01/doc.1013/e13975/datasrc.htm#CHDIBFHG
Using Deployment Plans: http://download.oracle.com/docs/cd/E14101_01/doc.1013/e13980/deployplan.htm#CHDFEFAE
cheers
-steve-

Add second instance to Enterprise Manager 10g database control

Hi,
I have a server with one Oracle 10g database instance, and I
configured the local Enterprise Manager database control for it.
Now I added a second instance on the server, using the same Oracle
home. Can I manage this new instance using the existing database
control or do I have to configure a second database control using
another port? The documentation isn't too clear on this.
Thanks,
Matthias

You can't manage the two database using database control. you have to go for Grid control only if you need to configure two or more instance.

Creating second instance 10g (non rac)

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