Oracle Clustre, Oracle Cluster with RAC and Oracle 10g

Is there a difference between Oracle Cluster and Oracle Cluster with RAC? Please explain. Do existing database codes run unmodified in Cluster or Cluster with RAC environment? What needs to be modified to make existing SQL codes RAC-aware. How to achieve 'all automatic' in case of failure and resubmission of Queries from failed instance to a running instance?
In 10g environment, do we need to consider licensing of RAC as a separate product? What are additional features one derives in 10g that is not in Cluster +RAC?
Your comments and pointers to comparison study and pictorial clarification will be very helpful.

Oracle cluster like failsafe before or Veritas Cluster or other vendor's cluster is meant for HA (high availability) purpose. Which 2 nodes or more can see a shared disk with 1 active node. Whenever this active node failed through heartbeat other machine will know and will take the database over from there.
Oracle RAC is more for HA and load balance. In Oracle RAC 2 or more nodes are accessing the database at the same time so it spread load across all these nodes.
I believe Oracle 10g RAC still need seperate license for it. But you need to call Oracle or check the production document to verify it.
Oracle 10g besides improvement in RAC. It's main improvement is on the build in management of the database itself. It can monitored and selftune itself to much furthur level then before and give DBA much more information to determine the cause of the problem as well. Plus improvement on lots of utility as well like RMAN , data pump etc... I don't want to get into too much detail on this you can check on their 10g new features for more detail view.
Hope this help. :)

Similar Messages

Install SAP ERP 6.0 with Linux and Oracle RAC

Hi Guru,
I want to install SAP ERP 6.0 with Linux and Oracle RAC. Is this possible?
Where do I find information?
Thanks,
Hugo.

Hello Hugo,
You can use either RAC or dataguard. On note [105047|http://service.sap.com/sap/support/notes/105047]:
14. Data Guard
    o You can use "Physical Standby".
    o You cannot use "Logical Standby".
    o You can use Data Guard Broker.
    o You can use Maximum Performance Mode, Maximum Availability Mode and Maximum Protection Mode.
    o In the case of Maximum Availability and Maximum Protection, you must pay particular attention to a fast network connection in order to avoid performance problems.
    o Maximum Protection causes the primary database to terminate if problems occur in the standby database.
60. Real Application Cluster (RAC)
    o You can use this feature in accordance with Note 527843.
Regards,
Eduardo Rezende

Directory Setup for RAC and Oracle Restart

I have three database installations that I'd like some insight on the initial directory structure and permissions. The three installations are:
1) Prod RAC - OEL 5U2, 11.2.0.2 Grid Infrastructure, 11.2.0.2 DB EE with RAC option
2) Test RAC - OEL 5U2, 11.2.0.2 Grid Infrastructure, 11.2.0.2 DB EE with RAC option
3) Single Instance - OEL 5U2, 11.2.0.2 Grid Infrastructure Standalone (Oracle Restart), 11.2.0.2 DB EE
The they all have two users GRID (for Grid Infrastructure Software Owner) and ORACLE (for Oracle Database Software Owner).
We had a consultant install the databases. It's very weird since we have an inconsistency in directories and permission. I want to understand the inconsistency between RAC installations as well as Oracle Restart Install.
SEE BELOW: The two RAC servers have different owners for /u01/app/11.2.0.2 directory. The Oracle Restart Installation - Single Instance has the same owner as Prod RAC but different than Test RAC. What the consultant said was that ORACLE_BASE would be /u01/app/oracle for both Grid Infrastructure and Database installations. This was to apply to TEST/PROD RAC (3 node, 3 instances, 1 instance/node) and Oracle Restart installation. The GRID_HOME would be /u01/app/11.2.0.2/grid and ORACLE_HOME would be /u01/app/11.2.0.2/db_1. It seems like the owners aren't setup correctly. Why? I don't want problems with patching or upgrading. If this setup is technically incorrect what is the best way to setup so there's no owner/permission issues. Is it necessary to have two separate ORACLE_BASE's like /u01/app/grid?
PRODUCTION REAL APPLICATION CLUSTER (Displaying only one Node details)
$ cd app
drwxr-xr-x 6 root oinstall 4096 Feb 26 2011 .
drwxr-xr-x 3 root oinstall 4096 Apr 21 2009 ..
drwxrwxr-x 4 grid oinstall 4096 Feb 26 2011 11.2.0.2
drwxrwxr-x 2 emagent oinstall 4096 Feb 26 2011 emagent
drwxrwxr-x 9 oracle oinstall 4096 May 16 2011 oracle
drwxrwx--- 7 grid oinstall 4096 Feb 26 2011 oraInventory
$ cd 11.2.0.2
drwxrwxr-x 4 grid oinstall 4096 Feb 26 2011 .
drwxr-xr-x 6 root oinstall 4096 Feb 26 2011 ..
drwxr-xr-x 79 oracle oinstall 4096 Mar 29 2011 db_1
drwxr-xr-x 69 root oinstall 4096 Feb 26 2011 grid
$ cd ..
$ cd oracle
9 oracle oinstall 4096 May 16 2011 .
drwxr-xr-x 6 root oinstall 4096 Feb 26 2011 ..
drwxr-xr-x 4 oracle oinstall 4096 Feb 26 2011 admin
drwxr-xr-x 3 oracle oinstall 4096 Feb 26 2011 cfgtoollogs
drwxrwxr-x 2 grid oinstall 4096 Feb 26 2011 Clusterware
drwxrwxr-x 11 grid oinstall 4096 Feb 26 2011 diag
drwxrwxr-x 3 grid oinstall 4096 Feb 26 2011 hqrac03
drwxr----- 3 oracle oinstall 4096 May 16 2011 oradiag_oracle
drwxr-xr-x 3 root root 4096 Mar 13 2011 oradiag_root
TEST REAL APPLICATION CLUSTER (Displaying only one Node details)
$ cd app
drwxr-xr-x 6 root oinstall 4096 Jan 26 2011 ./
drwxr-xr-x 3 root oinstall 4096 Jan 26 2009 ../
drwxrwxr-x 4 root oinstall 4096 Jan 26 2011 11.2.0.2/
drwxrwxr-x 2 emagent oinstall 4096 Mar 1 2011 emagent/
drwxrwxr-x 10 grid oinstall 4096 May 16 2011 oracle/
drwxrwx--- 7 grid oinstall 4096 Jan 27 2011 oraInventory/
$ cd 11.2.0.2
drwxrwxr-x 4 root oinstall 4096 Jan 26 2011 ./
drwxr-xr-x 6 root oinstall 4096 Jan 26 2011 ../
drwxr-xr-x 80 oracle oinstall 4096 Mar 17 2011 db_1/
drwxr-xr-x 70 root oinstall 4096 Jan 27 2011 grid/
$ cd ..
$ cd oracle
drwxrwxr-x 10 grid oinstall 4096 May 16 2011 ./
drwxr-xr-x 6 root oinstall 4096 Jan 26 2011 ../
drwxr-xr-x 4 oracle oinstall 4096 Feb 2 2011 admin/
drwxr-xr-x 4 oracle oinstall 4096 Feb 2 2011 cfgtoollogs/
drwxr-xr-x 2 grid oinstall 4096 Jan 26 2011 Clusterware/
drwxrwxr-x 11 grid oinstall 4096 Jan 26 2011 diag/
drwxr-xr-x 3 grid oinstall 4096 Jan 26 2011 hqract03/
drwxr-xr-x 3 grid oinstall 4096 Mar 23 2011 oradiag_grid/
drwxr----- 3 oracle oinstall 4096 May 16 2011 oradiag_oracle/
drwxr-xr-x 3 root root 4096 Jan 27 2011 oradiag_root/
SINGLE INSTANCE DATABASE (ORACLE RESTART)
$ cd app
drwxrwxr-x 6 503 oinstall 4096 Feb 26 2011 .
drwxr-xr-x 3 root root 4096 Apr 16 2009 ..
drwxrwxr-x 4 grid oinstall 4096 Feb 26 2011 11.2.0.2
drwxrwxr-x 8 grid oinstall 4096 Feb 26 2011 oracle
drwxrwx--- 6 grid oinstall 4096 Feb 26 2011 oraInventory
$ cd 11.2.0.2
drwxrwxr-x 4 grid oinstall 4096 Feb 26 2011 .
drwxrwxr-x 6 503 oinstall 4096 Feb 26 2011 ..
drwxr-xr-x 76 oracle oinstall 4096 Apr 6 2011 db_1
drwxr-x--- 69 root oinstall 4096 Feb 26 2011 grid
$ cd ..
$ cd oracle
drwxrwxr-x 8 grid oinstall 4096 Feb 26 2011 .
drwxrwxr-x 6 503 oinstall 4096 Feb 26 2011 ..
drwxrwxr-x 5 grid oinstall 4096 Feb 26 2011 admin
drwxrwxr-x 7 grid oinstall 4096 Feb 26 2011 cfgtoollogs
drwxrwxr-x 2 grid oinstall 4096 Feb 26 2011 checkpoints
drwxrwxr-x 2 grid oinstall 4096 Feb 26 2011 Clusterware
drwxrwxr-x 11 grid oinstall 4096 Feb 26 2011 diag
drwxrwxr-x 3 grid oinstall 4096 Feb 26 2011 hqods01
Thanks so much.

Hello
I did only check prod, as that is the important one.
i am afraid that setup is not clean. I won't use the work is wrong, but need to be normalized.
grid oracle base need to be separate from oracle oracle base, and the grid oracle home, MUST be outside of oracle base/oracle home of the oracle user.
In a multi user setup, the structure should be as follow.
grid user, group oinstall, asm* groups
oracle user, group oinstall, dba and db* groups
The GRID install, have, grid home and oracle base
the oracle base for grid should be, /u01/app/grid
the grid home should be, /u01/app/11.2.0.3/grid
the Oracle user have several homes, and oracle base
the oracle base for oracle should be, /u01/oracle
so, for permissions, when I create this, i do as root
mkdir -p /u01/app/11.2.0.3/grid
mkdir -p /u01/app/grid
mkdir -p /u01/app/oracle
mkdir -p /u01/app/oraInventory
chown -R grid:oinstall /u01
chown -R oracle:oinstall /u01/app/oracle
then, you install grid .. you have so say oracle home is /u01/app/grid and oracle home is /u01/app/11.2.0.3/grid
at the end, the root.sh as part of the install will take care of the permissions for oraInventory, and the rest for grid.
when grid is installed, you can move to the oracle db install you use oracle base as /u01/app/oracle and oracle home as /u01/app/oracle/product/11.2.0.3/dbhome_1
that will give you
2 4 drwxr-xr-x 6 root oinstall 4096 Sep 21 03:20 /u01
5996545 4 drwxr-xr-x 6 root oinstall 4096 Sep 18 22:58 /u01/app
5996546 4 drwxr-xr-x 8 grid oinstall 4096 Sep 18 22:50 /u01/app/grid
5996547 4 drwxr-xr-x 3 root oinstall 4096 Sep 18 22:30 /u01/app/11.2.0.3
5996548 4 drwxr-xr-x 69 root oinstall 4096 Sep 21 10:52 /u01/app/11.2.0.3/grid
5996549 4 drwxrwx--- 5 grid oinstall 4096 Oct 30 22:08 /u01/app/oraInventory
7406840 4 drwxr-xr-x 7 oracle oinstall 4096 Oct 30 22:09 /u01/app/oracle
7406841 4 drwxr-xr-x 3 oracle oinstall 4096 Sep 18 22:58 /u01/app/oracle/product
7406842 4 drwxr-xr-x 6 oracle oinstall 4096 Oct 30 22:04 /u01/app/oracle/product/11.2.0.3
7766052 4 drwxr-xr-x 77 oracle oinstall 4096 Nov 2 01:20 /u01/app/oracle/product/11.2.0.3/dbhome_1
Each user have to use his own oracle_base, as each oracle_base will store files and folders created for logs, admin, diagnostic with different permissions and different usages, for a reason you have role separation.
example of the content of each oracle base
$ find /u01/app/oracle/ -maxdepth 1 -ls
7406840 4 drwxr-xr-x 7 oracle oinstall 4096 Oct 30 22:09 /u01/app/oracle/
7406841 4 drwxr-xr-x 3 oracle oinstall 4096 Sep 18 22:58 /u01/app/oracle/product
8749076 4 drwxrwxr-x 3 oracle asmadmin 4096 Sep 18 23:03 /u01/app/oracle/diag
8749064 4 drwxr-x--- 6 oracle oinstall 4096 Oct 30 22:09 /u01/app/oracle/admin
8716289 4 drwxr-xr-x 2 oracle oinstall 4096 Oct 30 22:18 /u01/app/oracle/checkpoints
8749061 4 drwxr-x--- 5 oracle oinstall 4096 Sep 18 23:12 /u01/app/oracle/cfgtoollogs
$ find /u01/app/grid/ -maxdepth 1 -ls
5996546 4 drwxr-xr-x 8 grid oinstall 4096 Sep 18 22:50 /u01/app/grid/
7307540 4 drwxrwxr-x 4 grid oinstall 4096 Sep 18 22:49 /u01/app/grid/diag
7307474 4 drwxr-xr-x 2 grid oinstall 4096 Sep 18 22:33 /u01/app/grid/Clusterware
7307265 4 drwxr-xr-x 2 grid oinstall 4096 Sep 18 22:33 /u01/app/grid/checkpoints
7307532 4 drwxr-x--- 4 grid oinstall 4096 Sep 18 22:49 /u01/app/grid/cfgtoollogs
7406796 4 drwxr-xr-x 3 root root 4096 Sep 18 22:50 /u01/app/grid/oradiag_root
Take care,
Alvaro.

RAC and Oracle Sequences

We have a RAC running for two instances , we have noticed that one trigger on update which is using a sequences to get ids is not allocating such sequences
on sequence as expected , is every instance of RAC caching a set of sequences and the other instance have no idea about this , is this a configuration which has
to be done at RAC level

sayantan chakraborty wrote:
what is the difference between RAC and Oracle clusterware?RAC = Oracle Real Application Clusters
http://www.oracle.com/technology/products/database/clusterware/clusterware_for_unbreakable_linux_faq.html#
In the event of a system failure, clustering ensures high availability to users. Redundant hardware components, such as additional nodes, interconnect, and disks, allow the cluster to provide high availability. Such redundant hardware architectures avoid single points-of-failure and provide exceptional fault resilience.
In Oracle Real Application Clusters (RAC) environments, Oracle Clusterware monitors and manages Real Application Cluster databases. When a node in the cluster is started, all instances, listeners and services are automatically started. If an instance fails, the clusterware will automatically restart the instance, so that the service is often restored before the administrator notices it was down. In this sense Oracle Clusterware is the basis for Oracle Real Application Clusters.
In those environments RAC ensures the continuous operation of the database as well as its scalability by running more than one database instance simultaneously, typically one on every node in the cluster.
You cna
how to get RAC 10g?What did you mean?
If you mean Software:
http://www.oracle.com/technology/software/index.html
Docs:
http://www.oracle.com/technology/products/database/clustering/index.html
http://www.oracle.com/pls/db102/portal.portal_db?selected=16
Or Search on Google
http://www.google.co.th/search?rlz=1C1GGLS_thTH327TH327&sourceid=chrome&ie=UTF-8&q=Oracle+Real+Application+Cluster
Good Luck

Fresh Instalation of Oracle E-bussiness suite with RAC database

Hi,
Could you pls give me a high level overview steps for Fresh Installation of E-Bussines suite 11i/R12 with RAC database?
Thanks
John

RapidWiz does not have the feature of installing Oracle Apps 11i/R12 with RAC. Refer to the following links for more details about the installation steps.
11i (11.5.10.2+ virtual) Documentation Library
http://download-uk.oracle.com/docs/cd/B25516_14/current/html/docset.html
Release 12.0.4 Documentation Library
http://download.oracle.com/docs/cd/B40089_09/current/html/docset.html
For RAC configuration, depending on your application/database version, please refer to the following note (All relevant notes/documents for configuring 11i/R12 with 9i/10g/11g RAC database are listed in this note):
Note: 745759.1 - Oracle E-Business Suite and Oracle Real Application Clusters Documentation Roadmap
https://metalink2.oracle.com/metalink/plsql/ml2_documents.showDocument?p_database_id=NOT&p_id=745759.1

Create PDF report with APEX and Oracle 11g doesn't work

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I have a problem with the downloading of PDF reports from APEX with Oracle 11g.
When I try to download a PDF, Acrobat Reader says it can not open the file.
I have done the same test in an environment with APEX and Oracle 10g and it works perfectly.
Does anyone know if there is a known bug for version 11g.
Thank you very much.

Hi Munky,
I open the generated file the Notepad++ I can read the next message:
*<HTML><HEAD><TITLE>500 Internal Server Error</TITLE></HEAD><BODY><H1>500 Internal Server Error</H1>OracleJSP:*
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I have not idea can I solve the problem.
Have you got any solution for this problem??
Thank you so much.
Victor Muñoz.

Uses for the Action Property with SQL and Oracle DB Adapters

This thread is a complement to the Wiki Article
BizTalk: Streamlining WCF SQL and Oracle Messaging-Only and Other Patterns
The question. In what circumstances is explicitly setting the Action value with the WCF SQL and Oracle DB bindings useful or beneficial.
A complimentary question. Is it even possible to set the Action value to anything other than exactly what is required by the Message.
I ask because of three very specific behaviors of the bindings themselves:
The binding enforces a match between the Action and the Message, therefore...
There is a one-to-one relationship between the Message and Action, but...
The binding is able to correctly derive and perform the requested operation with the unspecific CompositeOperation.
For clarity, I understand how to set the Action. I. understand what the Action represents in the SOAP scheme. I understand how Action can be used as an abstraction for SOAP operations.
Thoughts?

Do you have any good suggestion to learn how to use action property with SQL and Oracle DB adapters? I learn a lot from your replies for years in BizTalk forum. :)

Its compatible OWB 9.0.4.10 with W2003 and Oracle 10.2.0.1?

I have to migrate a DWH on Server 1 (OWB 9.0.4.10, Oracle Workflow 2.6.2, Windows 2000, Oracle 9.2.0.6) to Server 2 1 (OWB 9.0.4.10, Oracle Workflow 2.6.3, Windows 2003, Oracle 10.2.0.1)
Its posible to use OWB 9.0.4.10 with W2003 and Oracle 10.2.0.1?
Thanks very much in advance!

Hi,
This is the relevant section from Metalink's 'Certify' section:
Server Certifications
Product      Server      Status      Addtl. Info.      Components      Other      Issues
10.1.0.x      9.2.0.x      Certified      None      None      Yes      None
10.1.0.x      8.1.7 (8i)      Desup:RDBMS      None      None      N/A      N/A
10.1.0.x      10.2.0.x      Certified      Yes      None      Yes      None
10.1.0.x      10.1.0.x      Certified      None      None      Yes      None
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J would like to know if there are some differences between Oracle 8i for a UNIX Platform and Oracle 8i for a Linux Platform.
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We have installed Oracle 8i on Solaris 8 and it had a great performance, of course that the hardware and licence invested here was costed my the office where i work. Personaly i'd installed linux reh hat 8 and oracle 8i, imagine that, it could be implemented by any individual that has the time to do so.
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Hello,
we are seing problems with RAC and XA (Tuxedo 11, DB 11.2), specifically encountering "ORA-24798: cannot resume the distributed transaction branch on another instance".
The first scenario relates to fallback after a RAC node failure. There are two servers, S1 and S2. S1 makes an ATMI call to S2. Both servers are in the same Tuxedo group, using TMS_ORA. RAC is set up for failover (BASIC), no load balancing.
The sequence is:
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- RAC node n1 recovers. All is still well (as there is no automatic fallback).
- S1 (or S2) is restarted (either intentionally or because of a crash). Since n1 is up again, S1 connects to n1. Now we get ORA-24798. Permanently.
S1 is connected to n1 and S2 is connected to n2. Since both are in the same group, both use the same XA transaction branch. When called, S2 attempts to JOIN the transaction branch that S1 started. But the DB (11.2) does not allow the same branch to span more than one node. Hence the ORA-24798.
This seems to be a severe limitation in the combination of Tuxedo, XA and RAC. It basically means we still have to use DTP services, even with Tuxedo 11 and DB 11.2. Or are we missing something?
We could put S1 and S2 into different groups, but that seems to be inefficient, and not practical for a real application (10s of servers).
I am extrapolating from this that RAC load balancing would also not work, as S1 and S2 could be connected to different RAC nodes.
Roger

Roger,
When using an external transaction manager such as Tuxedo you should still declare Oracle services as DTP services when using Oracle Database 11g. The Tuxedo documentation is not clear about this. The relevant 11gR2 RAC documentation is at http://download.oracle.com/docs/cd/E11882_01/rac.112/e16795/hafeats.htm and states
"An XA transaction can span Oracle RAC instances by default, allowing any application that uses the Oracle XA library to take full advantage of the Oracle RAC environment to enhance the availability and scalability of the application.
"GTXn background processes support global (XA) transactions in an Oracle RAC environment. The GLOBAL_TXN_PROCESSES initialization parameter, which is set to 1 by default, specifies the initial number of GTXn background processes for each Oracle RAC instance. Use the default value for this parameter clusterwide to allow distributed transactions to span multiple Oracle RAC instances. Using the default value allows the units of work performed across these Oracle RAC instances to share resources and act as a single transaction (that is, the units of work are tightly coupled). It also allows 2PC requests to be sent to any node in the cluster.
"Before Release 11.1, the way to achieve tight coupling in Oracle RAC was to use Distributed Transaction Processing (DTP) services, that is, services whose cardinality (one) ensured that all tightly-coupled branches landed on the same instance—regardless of whether load balancing was enabled. Tightly coupled XA transactions no longer require the special type of singleton services to be deployed on Oracle RAC databases if the XA application does not join or resume XA transaction branches. XA transactions are transparently supported on Oracle RAC databases with any type of service configuration.
A"n external transaction manager, such as Oracle Services for Microsoft Transaction Server (OraMTS), coordinates DTP/XA transactions. However, an internal Oracle transaction manager coordinates distributed SQL transactions. Both DTP/XA and distributed SQL transactions must use the DTP service in Oracle RAC."
This issue came up earlier this year in another newsgroup thread at https://forums.oracle.com/forums/thread.jspa?threadID=2165803
Regards,
Ed

Database replication between Oracle RAC and Oracle Standalone DB in 9i

Hi,
We have currently 4 node RAC environment and Oracle RAC implementation with 4 Oracle instances. We want to move the one instance and make it Standalone with Oracle database due to availability issue. Thus we will remain with 3 nodes on the RAC database and one Standalone database. We want to implement Oracle replication on this solution, where partial database of RAC environment needs to be replicated to Standalone node.
We will have Oracle 9i database server for both RAC and Standalone machine.
The partial data that we are looking for replication are of size 25GB. Some of questions we have:
1. Is there any other replication mechanism apart from Materilzed view for this solution?
2. Is it feasible to sychronize around 25GB data between servers?
3. What can be estimated time for refresh or Synchronization?
The methods that we are evaluating currently for this replication are:
1. Multi Master replication
2. Oracle 9i Datagaurd.
Please let me know if we need to look for some other methods of replication also.
Thanks in advance for help.

ManojMac wrote:
The partial data that we are looking for replication are of size 25GB. Some of questions we have:
1. Is there any other replication mechanism apart from Materilzed view for this solution?Streams is another option
2. Is it feasible to sychronize around 25GB data between servers?Sure. Depending on the rate of change, your latency requirements, whether the standalone database has the horsepower to apply all the changes generated by to other three nodes, etc.
3. What can be estimated time for refresh or Synchronization?Depends on the architecture, the network connection, whether you are doing incremental refreshes, etc. And it depends on what time you're measuring-- you might be measuring the latency between the RAC cluster and the standalone database, you might be measuring the time it takes to incrementally refresh a single materailized view when there have been no changes, you might be measuring the time it takes to do a complete refresh of an entire refresh group, pulling 25 GB of data over the network.
The methods that we are evaluating currently for this replication are:
1. Multi Master replication
2. Oracle 9i Datagaurd.DataGuard is not an option if you only want to replicate a subset of the data. The two realistic options are materialized views and Streams. Are you anticipating that you will be making changes on both nodes? If not, you can use simple materialized views rather than multi-master replication.
Since 9.2 is not longer covered by Premier Support, are you planning to upgrade to a supported version in the near future? In particular, Streams works a lot better in later versions of the database.
Justin

Which is the difference between Oracle RAC and Oracle Clusterware?

Hi all, maybe this is a stupid question, but I've read the documentation, and still don't understand which is the difference between RAC and Clusterware.
Can anybody explain it to me?
Thanks in advance!

RAC is database option part of Oracle Database software needed to have database running in cluster mode; see http://download.oracle.com/docs/cd/E11882_01/server.112/e16508/glossary.htm#CNCPT2076.
Clusterware is separate software needed to run Oracle Database in cluster mode: you can use Oracle Clusterware without Oracle Database but you cannot use Oracle Database with RAC option without Oracle Clusterware.
See http://download.oracle.com/docs/cd/E11882_01/rac.112/e16794/intro.htm#BABCHEEE.
Edited by: P. Forstmann on 19 nov. 2010 19:11
Edited by: P. Forstmann on 19 nov. 2010 19:11

Database replication between Oracle RAC and Oracle Standalone DB

Hi,
We have currently 4 node RAC environment and Oracle RAC implementation with 4 Oracle instances. We want to move the one instance and make it Standalone with Oracle database due to availability issue. Thus we will remain with 3 nodes on the RAC database and one Standalone database. We want to implement Oracle replication on this solution, where partial database of RAC environment needs to be replicated to Standalone node.
We will have Oracle 9i database server for both RAC and Standalone machine.
The partial data that we are looking for replication are of size 25GB. Some of questions we have:
1. Is there any other replication mechanism apart from Materilzed view for this solution?
2. Is it feasible to sychronize around 25GB data between servers?
3. What can be estimated time for refresh or Synchronization?
Thanks in advance for help.

The methods that we are evaluating currently for this replication are:
1. Multi Master replication
2. Oracle 9i Datagaurd.
Please let me know if we need to look for some other methods of replication also.

Hibernate OR EclipseLink...Which is best with Weblogic and Oracle DB?

Hi All,
In my company, we are using Oracle DB and Weblogic application server. So in the process to upgrade or switch to new ORM, we shortlisted two options - Hibernate and EclipseLink.
I gathered following summary regarding both ORMs -
Hibernate:
1.     When you need to train people, like we are going to do next week – most of the companies have Hibernate experts.
2.     When you hire new developers, most of them come with specific Hibernate experience.
3.     When you need to consult with experts, both in the internet or consultants, you have LOTS of options. Endless forums and communities all regarding Hibernate.
4.     Hibernate is an open source which has a huge community. This means that it will be improved all the time and will push the ORM market forward.
5.     Hibernate is an open source which means you have the code to handle, and in case needed, fit it to your needs.
6.     There are lots of plugins to Hibernate, such as validations tool, audit tools, etc. These becomes standard as well and dismiss you from impl. things yourself.
7.     One most important thing with ORM tool, is to configure it according to your application’s needs. Usually the default setting doesn’t fit to your needs.
For that sake, when the market has a huge experience with the tool’s configuration, and lots of experts (see point 1 and 3) – most of chances you will find similar cases and
lots of knowledge about how to configure the tool and thus – your application.
EclipseLink:
1. Fully supported by Oracle. Hibernate no. In case of pb, it could be cumbersome to prove that it is a pure Weblogic one. Concretely, we will have to prove it (waste of time and complexity).
2. Eclipse link is developed by Oracle and the preferred ORM in the Weblogic /Oracle DB world.
3. Even if at a certain time EclipseLink was a bit late compared to Hibernate (feature), EclipseLink evolved very fast and we can consider now that they close the gap.
4. No additional fee as soon as you have Weblogic license. You will need to pays additional fee if you want some professional support on Hibernate.
5. We are currently relying on Hibernate for our legacy offer and are facing pb in second level cache (JGroups). Today, we are riding off this part!. Consequences are limitation in clustering approach (perf)
6. On EclipseLink side we do succeed to manage first and second level cache in a clustering approach.
7. Indeed Hibernate is open source, so you can imagine handling it. In reality, the code is so complex that it is nearly impossible to modify it. Moreover as it is LGPL, you need to feedback all the modified sources to the community systematically.
8. All tests performed by Oracle concerning Weblogic are using EclipseLink. Moreover, Oracle says that some specific optimizations are done to manage Oracle DB.
9. Hibernate comes from JBoss community.
Right now we are preferring Hibernate but there are concerns/reasons like EclipseLink developed by Oracle and preferred ORM in Webogic/ Oracle DB world (compatibility of ORM with DB and App. server), support comparison with both ORM, which are preventing to finalize the decision.
Please help me with you views and opinions and share you experience with us so that we can make a perfect decision.
If you want you can also reply to me @ [email protected].
Thanks.

The way the ORMs are designed, integration with application servers are relatively simple, and all provides the same features. Also since WebLogic have been around for a while, all ORMs are all well tested in this configuration.
Hibernate has lot more users, and is likely very often used with Oracle DB, so you can expect not much bug against Oracle DB, maybe even less bug than EclipseLink, which is not much used. EclipseLink does provide support for some esoteric Oracle DB features like hierarchical and flashback queries.
OpenJPA and DataNucleus are also JPA compliant. It’s likely that Open JPA has a higher user base than EclipseLink, so less unknown bugs.
Oracle paying support is well known to be a bad joke. It’s a negative return to use this channel, even if they would be free. So in reality, you end up to use the open (free) forum to get support.
What’s was lacking with Hibernate before is Dynamic Fetch Planning, but they now have some support, see http://opensource.atlassian.com/projects/hibernate/browse/HHH-3414. OpenJPA was the first to implement this must have.
EclipseLink has query in memory, which can be used, but the API do not help to leverage it, and EclipseLink’s leadership made it clear that they are not going to make it better, instead they want to push Coherence cache.
Hibernate has an open API for second level cache, which mean you can get out of problem by using another implementation, for example, EHCache seems to be professionally tested, so I would be surprise you find obvious bugs.
I cannot comment on Hibernate source code quality, but I can tell you that locking mechanism in EclipseLink is used to be very fragile, and many concepts are dispersed over the code base.
The runtime monitoring of Hibernate have always been great due to the fact that JBoss have always been strong on JMX, EclipseLink has not much usable features on this.
If I would be you, I would consider OpenJPA or Hibernate instead of EclipseLink, the main reason is that because EclipseLink has a so low user base, I have found lot of obvious bugs in production, like if I was the only user of it. Then, when I submitted bugs to the small development team, which do not encourage user base contribution, they were too busy trying to keep up adding the JPA interfaces on top of their existing proprietary APIs.

Oracle Clustre, Oracle Cluster with RAC and Oracle 10g

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