Rac clarification

Hello,
I just need a confirmation if what im gonna state about Oracle RAC is correct.
1- With Oracle RAC we have more than one instance talking with only one database?
Thanks

A comment or two.
As Murali responded, there is a single physical database. An important thing to stress as most often the term "database" in other RDBMS products (like SQL-Server for example) refers to a logical database.
A logical database in Oracle terminology is a schema.
Also, one of an Oracle Cluster's primary differentiators over other RDBMS cluster products (like mySQL's) is that Oracle RAC is Shared Everything cluster.
The complete physical databases and all services and objects/tables/etc are available on each and every cluster node. And this difference is one of the primary reasons that Oracle RAC is "better" than the competition's cluster offerings.
Of course, mySQL marketing would have you believe that this is a "bad thing" as it makes Oracle RAC "too complex". Well duh.. just as a recreational Cessna pilot would find the cockpit of a Boeing 747 complex. A 747 is a commercial aircraft for moving cargo and passengers. Only idiots would compare it to a Cessna, pointing out that it is too complex too operate. Which is pretty much what mySQL's (and other's) marketing is when calling RAC complex - rather idiotic.

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Dear All,
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Please note that Oracle RAC doesnt have requirement any sepcific firm ware. If you upgrade the firmware, it should not break any existing config, so pls check with IBM.
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Satishbabu Gunukula
http://www.oracleracexpert.com

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I’ve an issue related to Oracle 10g RAC.
I’ve 2 node cluster each being Dell 2850 Server with RHEL 4.0
I’ve EMC CX300 SAN storage with following partitions
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/oracrs          2 Gb          OCFS2 File system
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With both nodes sharing the common Oracle Home (/orasoft/db_1), when ever I try to touch a file I get an error as No Space left on device. I’m unable to start any service with the same reason.
Is this setup correct ??
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HTH
Thanks
Chandra Pabba

Multiple RAC databases on same GI using different subnets for Public i/face

Hello. We are configuring a 2 node cluster. That cluster will host several RAC databases. For security reasons our networking team want to create separate subnets for the application traffic to each specific RAC database on the cluster.
E.g. application 1 has 2 application servers that will connect to RAC database PROD1 via one subnet, application 2 has 3 application servers that will connect to RAC database PROD2 via a different subnet, etc.
In addition the networking team want to configure a separate management subnet that DBAs etc. will use to administer all RAC databases and infrastructure in the cluster.
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Document referenced in thread 2199620 was not exactly what we were looking for, and didn't translate too well in Google Translate.
Any guidance much appreciated. Thanks, Rich.
Similar threads:
https://cn.forums.oracle.com/forums/thread.jspa?messageID=9846298? (Dual SCAN on multi homed cluster)
https://cn.forums.oracle.com/forums/thread.jspa?threadID=2199620 (scan listener in OAM VLAN)
Edited by: 887449 on 26-Sep-2011 01:41

Thanks Levi. Your advice is very much appreciated.
Your statement that we can only have one SCAN listener listening on one public network is actually the clarification I was looking for.
For anyone else reading this thread I believe this gives us 3 options:
1) Configure a SCAN listener and have all applications, and all management/administration, connecting to the corresponding database on the same cluster via that SCAN listener, all on the same subnet.
2) Configure a SCAN listener for use by all applications connecting to the corresponding database on the same cluster, and use TNSNAMES/VIP for management/administration traffic, both on separate subnets (by configuring the LISTENER_NETWORKS parameter)
3) Configure a SCAN listener for use by applications connecting to one of the databases on the cluster via one subnet, use TNSNAMES/VIP for all other applications connecting to other databases, each using their own subnet. Plus, the management/administration could be via another subnet utilising TNSNAMES/VIP.
From our perspective we will work out the best one for us and implement accordingly.
Thanks again for your timely and comprehensive response.

Reporting Services connections are getting dropped by Oracle RAC

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Hi,
I suggest you look at:
http://www.oracle.com/technetwork/database/clustering/overview/awm11gr2-130711.pdf
and the similar paper from 11.1:
http://www.oracle.com/technetwork/database/clustering/overview/awmrac11g-133673.pdf
This explains the basic concept, of how clients should connect to the database, and probably clarifies your issue.
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Need to Upgrade to RHEL 5.5 on 10.2.0.4.0 DB RAC Servers

Hello,
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1.) Does this forum agree with this assessment?
2.) Is it possible to do this as a rolling upgrade such that exisitng users can use the 1st node while we rebuild the 2nd node - and then switch them over to the 2nd node and we rebuild the remaining 1st node?'
3.) Does any one have a link or document ID that they might point me to to aid in doing this? Otherwise, I will do what seems the most obvious, back the OS and DB files (mayeb do an RMAN backup as well), let the Sys Admins blow the existing OS away (node by node - see prev question for rolling upgrade question), re-install CRS and RAC and then move the data files in question back to start up the DB.
Thank you.
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The term rolling upgrade refers to upgrading different databases or different instances of the same database in a RAC environment, one at a time, without stopping the database. Oracle supports the rolling upgrade of Oracle RAC (not OS like I wrote previously) in a cluster when both versions of the operating system are certified with the version of the Oracle Database you are running. Rolling patch upgrades are not available if the Oracle Database software is shared across the different nodes. This is the case where the Oracle home is on Cluster File System (CFS) or on shared NFS volumes. The feature is only available where each node has its own copy of the Oracle Database software.
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To answer you question about the difference with Oracle Linux. The same versions of Oracle Linux and Red Hat Enterprise are binary compatible. For Oracle Linux 5.5, x86_64, you have an option to install the Unbreakable Enterprise Kernel (UEK), which contains a newer and Oracle optimized version of the kernel, currently 2.6.32. Oracle Linux provides a free public yum repository for software management and other Oracle specific packages. For access to patches you need a subscription to the Unbreakable Linux Network (ULN).
http://www.oracle.com/us/technologies/linux/index.html
http://www.oracle.com/us/corporate/pricing/els-pricelist-070592.pdf
https://www.redhat.com/apps/store/server/
Edited by: MaC on Dec 20, 2010 7:20 PM

Shared FRA disk between Primary and Standby RAC

Hello all,
I need some clarification. Can a ASM +FRADG shared between RAC 2 nodes 11gR2 Primary and RAC 2 nodes 11gR2 Physical Standby Database in order to use it for backup and recovery on both databases.
Thank you.

Hi,
If you are looking this document:
http://docs.oracle.com/cd/E11882_01/server.112/e18951/asmcon.htm#OSTMG94055
Then I understand it that you can use ASM diskgroups only inside same Oracle Clusterware.
So if you have two separate RAC clusters (two separate Oracle Clusterware) then you cannot share ASM between those.
And I don't think it would be wise even if it would be possible.
This is because if one database will fill up your FRA disks then both RAC databases are hold (if you are putting your archivelogs in the FRA).
Also disk/diskgroup maintenance jobs might be difficult in that kind of configuration.

Oracle 11gR2 RAC setup with ASM option running on two nodes . Seeking help

Hi ,
Recently we have migrated to 11gR2 extended RAC for one of our application using ASM . Its a two node RAC setup . We are using ASM Normal redundancy feature maintaining two failure group .
I need few clarification regarding our new DR set up .
We are planning to have EMC SRDF replication from any of node storage ( Either 1 or 2) to the DR disks .
Its stright to use when we use the normal file systems . In case of ASM , I am not sure how this replication will work ? and on which level the replication should happen ?
Do i need an ASM instance up and running on DR server , Which will recognize the disks as it is once DR disks are separated from prod replication and assigned to the server ?
What should be prerequisite on DR server before we can start the srdf replication (EMC) and make it work .
Thanks for All your Valuble suggestion .

Before you decide to use EMC replication give considerable thought to the fact that you are introducing a single point of failure.
Hardware snapshot replication is very fast. That is all it is. If you database crashes because of corruption on disk ... your replica will be equally corrupt.
What is fast can not do what DataGuard does ... verify quality. If the point is DR. Go with DataGuard unless EMC is willing to, in writing (not verbally) give you a guarantee (in hard cash) to cover all costs if they replicate bad blocks and it causes an outage.
And just so no one thinks I'm picking o EMC ... the same weakness exists with all of the other storage vendor's products.

Multiple databases in one single RAC cluster

Hi, I would like to know if one can have multiple databases running on a single RAC cluster, we have several databases in our shop and would like to consolidate all of them into a single 3-4 node RAC cluster running databases with 10.2 and 11.1 versions.
I am newbie to RAC and would like to get some clarification if anyone has done this, google search comes up with few hits on this topic, so obviously this is not doable.
In our case we have one database supporting critical applications and few other not so critical but are used very extensively between 9-5, so what is the use of RAC if I cannot consolidate all my databases into one cluster, or if I need a separate cluster for each of these critical databases?
I have been all the Oracle docs that keep repeating one database multiple instances and one instance-one machine-one node, they don't even advise running multiple instances on a single node?.
I appreciate any insight.
Thanks.

ora-sql-dba wrote:
Can you give more details on how you would setup multiple databases running different versions on a single RAC cluster, I am yet to find any documentation that supports or even elaborates on this topic.You can configure a cluster with 12 nodes. Then, using dbca, configure a dev instance for nodes 1 and 2, a prod1 instance for nodes 3 to 6 and a prod2 instance for nodes 7 to 12.
You also can configure each of these instances for all 12 nodes. And use it on all 12 nodes.
Or, after configuring it for all 12 nodes, you can start the dev instance on nodes 1 and 2, prod1 on 3 - 6 and prod2 on the remaining nodes. If dev needs more power, you can for example shutdown prod2 on node 12 and start another dev instance there.
My issue is with the 2nd option - running more than one instance on the same node or server. Why? Each instance has a basic resource footprint ito shared memory needed, system processes required (like db writer, log writer, sys monitor) etc. It does not make sense to pay for that same footprint more than once on a server. Each time you do, you need to reduce the amount of resources that can be used by each instance.
So instead of using (for example) 60% of that server's memory as the SGA for a single instance, if you use 2 instances on that server you now have to reduce the SGA of each to 30% of system memory. Effectively crippling those instances by 50% - they will now have smaller buffer caches, require more physical I/O and be more limited in what they can do.
So unless you have very sound technical reasons for running more than one instance on a server (RAC or non-RAC), do not.

Oracle 9i rac interconnect

Hai,
I need clarification in oracle 9i rac internetconnect. Recently we have done installation of oracle 9i rac (9.2.0.4) on aix 5.3 with hacmp cluster for 2 nodes. We are not able to mount the second instance of the database after starting the first instance.
The problem was solved after adding cluster_interconnect parameter in the init.ora file. In all other servers, it is not given and oracle is selecting the interconnect automatically. For this new server alone this problem. I want to know from whether oracle is taking this interconnect if we dont mention the cluster_interconnect paramter. Even i have verified /etc/hosts file and entries are available in it. Requeting your help in this regard.

Where the IP information is stored and managed from depends on your implementation such as are you using a third party clusterware. If you are using Oracle clusterware its stored in the OCR.
You can check this using the following query...
SELECT * FROM GV$CLUSTER_INTERCONNECTS;
The source column will tell you where the interconnect information was obtained from.
BTW, if you are using the CLUSTER_INTERCONNECTS parameter you may loose some of the HA features here is something from the 10gR2 documentation..
" Failover and Failback and CLUSTER_INTERCONNECTS
Some operating systems support run-time failover and failback. However, if you use the CLUSTER_INTERCONNECTS initialization parameter, then failover and failback are disabled."
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Please check Metalink Note # 298891.1 talks about configuring NIC bonding on Linux there are similar options for other operating systems.
answered by Murali Vallath refer the link: this will be very useful to you.http://kr.forums.oracle.com/forums/thread.jspa?threadID=625931
hope, this will helps you.

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. :)

Weblogic - Fusion Middleware Cluster - Clarification - 11g

Hello All,
I've checked the forum and would need just a little clarification regarding weblogic cluster & fusion Middleware + Load Balancing.
My current Setup is:
==============
1 APP Server: Runs Fusion Middleware 11g Forms and Reports + Weblogic + OHS (windows 2008R2)
1 DB Server: Standalone database 11gR2 installation (windows 2008R2)
I've been asked to add a new app server and setup load balancing between the two app servers in order to split the incoming forms & reports requests.
What do I do? Do I install the new app server like the first one and just add it to an existing domain(clustering)? Is there a difference between fusion middleware clustering and weblogic clustering (as in database RAC - the whole idea being failover 24/7 no single point of failure?)
I would appreciate any assistance, and need not great detail, just need to make sense of the whole thing.
I'm already on with the following document: [http://docs.oracle.com/cd/E21764_01/web.1111/e13709/toc.htm]
Thanks in advance
Jan S.

Hi Jan
You are almost there. I would like to clarify some points for you.
1. You already have WLS + Forms/Reports and of course Backend RCU Database that has all the meta data for Forms/Reports. This RCU database is on single server Oracle database.
I've been asked to add a new app server and setup load balancing between the two app servers in order to split the incoming forms & reports requests.
2. The first question for above requirement is, do you need the new Server on the same Existing physical box or a different remote physical box. If on the same physical box (which I doubt), then there is NO need to install any new software like WLS, Forms/Reports etc. All you do is create a new Managed Server and add it to your existing Domain. NOW, do you currently have a Clustered Domain. If you, all you do is add this new server to that cluster. If not, then you need to add a New cluster and add your old and this NEW managed server to that Cluster. If your existing domain is only single server and is very recent, I would prefer create a brand new Cluster domain with Different Port numbers (you can change port numbers anytime later also). Then add/create one or two managed servers.
3. If you are give a new physical box for this new managed server, then YES, you do need to install exactly SAME version of Weblogic Server and same version of Forms/Reports server on this new machine. Then create a Cluster Domain with 2 managed servers. One managed server on first box where you will have Admin Server + Managed Server 1. Then run pack command. Go to other machine. Run unpack command to create second Managed Server. Now you got 2 managed servers in a Single Clustered Domain.
4. Now comes the Load Balancing Part. Never ever expose the individual managed server host and port and WebApp urls for any Clustered Domain. Instead install Apache Http Web App Server which I guess is same as Oracle Http Server. Oracle renamed it (there is no need for this, but it may be company policy). Anyhow all you do is, just install Apache Web Server. Copy some .dll (.so on linux) files to this apache installation. Then update httpd.conf file or weblogic.conf file with details of clustered weblogic domain managed servers host, port, url patterns etc.
5. All the External Requests will now go to Apache Web Server like http://apachehost:apacheport/xxxUrl. This Apache will take care of LOAD Balancing, Failover etc and based on input url pattern will redirect requests to back end cluster of weblogic managed servers.
6. The backend RCU database that has Metadata for Forms/Reports NEED NOT be Clustered. If you really have extremely heavy data, then you can have Oracle RAC database. Have multiple DB Nodes in RAC. For each Node, create a DataSource in Weblogic conolse and finally one master Multi Data Soiurce that uses all these single Datasources. But very rarely you really need RAC or clustered database for RCU. So for now, just go with single non-clustered Database that has RCU Schemas.
In conclusion, even though you have Forms/Reports, just follow the standard normal Weblogic Clustered domain Architecture for your requirement. All clustering is at application server level and nothing to do with any Oracles softwares like SOA/BPM, Forms/Report, BI etc etc.
Thanks
Ravi Jegga

Many dead cmd.exe on Windows 2008 R2 Oracle 11.2.0.2 RAC Installation

After successful installation of a two node Oracle RAC 11.2 on Windows 2008 R2 we investigate a daily growing number of cmd.exe all running the following statement:
*C:\Windows\system32\cmd.exe /K D:\oracle\cluster\11.2.0\grid\bin\cluvfy comp health -_format*
Does anyone know the originator/source of this "cluvfy" command?
Maybe the Grid Control Agent?
We think, that the "/K" option is the problem, i.e. the reason while the cmd.exe will not terminate.
When we run the "cluvfy" manually everythings results successfully.
Thanks for your reply.
Michael

I have done the same and get the run around from the support tech when I ask for clarification. Even asked duty manager for assistance and was sent right back to the support tech that I could not get conclusive answers to my question from the first time. Seems he is telling me that he opened a new bug up for my answer but the description of the problem is not the same so how can I believe him. He wants me to apply patch 12 but I thought the later patches set are supposed to contain previous patches, so why not apply patch 14 or newest. Seems none of the patches show that they solve the Windows Heap Issue for 11.2.0.3. Even the bug note says it will be fixed in 11.2.0.4. Just one more reason we are planning (although against my better judgement) to move away from oracle.

RAC database patchset 10.2.0.5 on windows

HI,
I have 2 RAC environment having 13 Production database with version 10.2.0.4 of database, clusterware and ASM on Windows server 2008 64 bit.
Now I need to apply patchset 10.2.0.5 on ONLY one database due to BUG. Instead of apply patchset on all RAC database and upgrade planning for only one affected database. I need to below clarification -
1. I am planning to apply patchset 10.2.0.5 on clusterware and ASM only.
2. Planning to install 10.2.0.5 on new oracle home.
3. Planning to upgrade one affected database from 10.2.0.4 to 10.2.0.5.
QUESTION HERE -
1. Will above plan work for one database only.
2. Will clusterware and ASM (10.2.0.5)will support both ORACLE_HOME (10.2.0.4 and 10.2.0.5) databases
3. How we can setup clusterware for this new ORACLE_HOME (10.2.0.5) DATABASEs.
Anyone have any plan or suggestion please share.

Hi,
Yes it is possible to have multiple ORACLE_HOMES inside a Oracle GRID infrastructure. To check the supported and compatibility My Oracle Support for this.
1. check compatibility of the components and make the design for your listener
2. Upgrade ASM en clusterware. to 10.2.0.5
3. Install new oracle software tree 10.2.0.5
4. upgrade one database to 10.2.0.5
keep in mind the Oracle Cluster Registry for this database has to change
Cheers,
Jos van den Oord
Blog : http://joordsblog.vandenoord.eu/
Company : http://www.transfer-solutions.com/
"Don't believe it, test it!"

Rac clarification

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