RAC on one node...

Hi All,
I want to explore RAC one node feauter. so I have installed ORACLE VM2.2 on my server. now what would be my next step?
can any one suggest me the step by step installation, I googling but having few confusion in the downloaded pdf...
please suggest me.
Thanks...
Edited by: user12115 on Apr 29, 2010 3:39 AM

Thanks Fahd..
I have gone through this same link and confuse because till now I have installed oracle VM2.2 only on my Linux box and I have only one linux physical box.
now do I start the Grid infrastructure? or create another VM from this linux physical box?
Thanks...

Similar Messages

CRS & RAC with 3 node

Hi EveryBody,
I am planing to install the Rac in my home, i mentioned the following information below.
i am using 3 system with windows 2000 server, i wan to install the oracle 10gR1 RAC.
my question is, for all nodes they need to install the CRS software ???? or one system is enough, and the same time what about the rac software, its enogh to install in one node or install in all node????
senthil

All nodes will will connected to each other with private IPs.......and you just need to install Clussterware and RAC from one node and add those nodes in your installtion. Oracle will install everything on its own on other nodes.
Hope this helps
Luck
Regards

Oracle RAC one node-11.2.0.1 with patch 9004119

Hi,
I'm slightly stuck here. I have successfully converted 11.2.0.1 2 node RAC to RAC one node with patch *9004119*(which has scripts required for racone). My single instances are up and running, relocation of databases go fine
As i launch my OEM, it pops with +"ORA-12505:TNS:listener does not currently know of SID given in connect descriptor".+ . Obviously, ./Raconeinit renames the DB instances, but doesn't get changed in OEM. It still lists my old instances.
I manually change ORACLE_SID to new instances in all my nodes, so i'm able to connect through sql, but how do i configure it in DB control so that the change is seen universally. Any application i run with the new instance gives me the above mentioned error.
Please respond!

Hi,
In continuation with my above query, i did some search and looked at 'raconeinit' script. It's basically trying to run certain commands to see the current server, free server, current running DB , stores the value in a variable and validates against the input I provide, which is not happening.
When i manually try to run the commands mentioned in script, it gives me invalid -i and -f options errors.
to see DB up:
+./crsctl status resource ora.$LOWER_DB_NAME.db | $GREP -i "^STATE" | $GREP -i "ONLINE" | $WC -l+
to see current server
+./crsctl status resource ora.$LOWER_DB_NAME.db | $GREP -i "STATE" | $AWK -F'ONLINE on ' '{print $2}'+
to see free servers
+./crsctl stat serverpool Free -v|$GREP -i active_servers|$AWK -F'=' '{print $2}'+
It is not accepting my input (free server) and hence exiting. :(
Need help badly

Oracle RAC one node

why Oracle introduced Oracle RAC one node in 11gR2?
I have gone through oracle documents on oracle rac one node, but i couldn't find much added advantage than instance failover. We have already some technologies like datagaurd and some third party softwares for instance failover.
Then why oracle introduced this RAC one node in the new release i.e 11gR2?
What exactly oracle wants to provide from oracle RAC one node?
Thanks...
Bharath

Why RAC one node?
Oracle RAC one node is a single instance of Oracle RAC that runs on the node in a cluster. The benefit of the RAC one node option is that it allows you to consolidate many databases into one cluster without a lot of overhead, while also providing high availbilty benefits of failover protection, as well as for Online rolling patch application and rolling upgrades for the Oracle clusterware.
Another aspect of RAC one node allows you to limit th CPU utilization of individual database instances within the cluster through a feature called resource manager instance caging, which gives you the ability to dynamilcally change the limit as required.
Furhtermore , with RAC one node there is no limitation for server scalabilty such that if applications outgrow the current resources than a single node can supply, you can then upgrade the applications online to Oracle RAC.
In tthe event that the node which is runnig Oracle RAc one node becomes saturated and out of resources, you can migrate the instance to another node in the cluster using Oracle rac one node and another new utilty called OMOTION feature.OMOTION feature for Oracle RAC 11g R2 rac allows you to migrate a running instance to another server without downtime or distrubtion in service for your enviornment.
Hope you're understand.

One node RAC pause/hang/block on other node shutdown

Hi,
We have a Java application running on Linux servers connecting to a 10.2.0.1 RAC cluster, also Linux. When the application starts it opens up a pool of connections to the databsae, and these are used throughout the life time of the application. One server connects to one RAC node.
AppA - DBA
AppB - DBB
When we shutdown one node, the application connecting to that node stops, which is what we would expect in this configuration.
What is strange is that the other application blocks for 63 seconds and then continues. So it is like the database is blocking, or the database connections are blocking.
We are not using TAF, FAN, FCN, LB, VIPs or any special features, just simple lightweight JDBC from one server to one database. In fact I do not thing we are unwittingly using any of these features, we have them switched off.
john

user1788323 wrote:
What is strange is that the other application blocks for 63 seconds and then continues. So it is like the database is blocking, or the database connections are blocking.How have you determined/diagnosed the 63s blocking? (more details in this regard may shed some light on the problem)
Assuming that the block is server side, then two basic reasons comes to mind.
Networking issue - the CRS on the surviving node has to perform certain functions, like switching the VIP of the node that left the cluster to a surviving cluster node. The listener may need to re-register services. A local firewall may need to be dynamically reconfigured for supporting the new failed-over VIP. Etc.
Thus these could result in some kind of delay or issue in the network layer that you are seeing from the client side.
Infrastructure issue. If the actual client request via JDBC reaches the server process, and it is slow in responding, then that is not a network issue - instead some underlying service or s/w layer that the server process needs to use to perform the client request is busy for those 63s.
This could be related to the Interconnect, the shared I/O storage layer or something along those lines. For example, how does the Interconnect and/or SAN switch re-act when a server node is powered down or rebooted?
There's not really sufficient information to make anything but a guesses.. You will need to isolate the problem with further testing.
I have seen similar problems with 10.1.0.3 CRS and RAC when a node is evicted from the cluster. In this case the "hung" period was in excess of 15 minutes and only for new connections (Listener unable to hand off to dedicated servers or dispatchers). Existing connections worked fine however and were unaware of any problems. But part of the issue in this case was a poor (outdated) driver layer - and also the last time we used proprietary binary drivers (kernel modules) from 3rd party vendors that results in a tainted (and very fixed and rigid) Linux kernel. Today we're sticking with an OpenSource driver layer only for Linux.

When one node reboot other node in RAC

Hi Friends,
I faced one situation where one node of RAC cluster had been rebooted by other node. This happen due to network interconnect link fluctuation.
Sep 13 16:23:48 kkvs1a su: [ID 810491 auth.crit] 'su admin' failed for wipro1 on /dev/pts/3
Sep 14 00:22:17 kkvs1a ixgbe: [ID 611667 kern.info] NOTICE: ixgbe3: link down
Sep 14 00:22:21 kkvs1a ixgbe: [ID 611667 kern.info] NOTICE: ixgbe3: link up, , full duplex
Sep 14 00:22:31 kkvs1a ixgbe: [ID 611667 kern.info] NOTICE: ixgbe1: link down
Sep 14 00:22:31 kkvs1a ixgbe: [ID 611667 kern.info] NOTICE: ixgbe3: link down
/opt/oracle/product/10.2.0/crs/log/node1/alertkk1a.log
==============================================
2013-09-14 00:22:05.180
[cssd(12561)]CRS-1612:node kk1b (2) at 50% heartbeat fatal, eviction in 14.251 seconds
2013-09-14 00:22:12.180
[cssd(12561)]CRS-1611:node kk1b (2) at 75% heartbeat fatal, eviction in 7.251 seconds
2013-09-14 00:22:13.180
[cssd(12561)]CRS-1611:node kk1b (2) at 75% heartbeat fatal, eviction in 6.251 seconds
2013-09-14 00:22:17.179
[cssd(12561)]CRS-1610:node kk1b (2) at 90% heartbeat fatal, eviction in 2.251 seconds
2013-09-14 00:22:18.180
[cssd(12561)]CRS-1610:node kkvs1b (2) at 90% heartbeat fatal, eviction in 1.251 seconds
This clearly shows CSSD of node kkvs1a has given node eviction message to kkvs1b node.
I got following messages on the instance which got rebooted:
ASM alert log:
Sat Sep 14 00:22:25 IST 2013
Error: KGXGN aborts the instance (6)
Sat Sep 14 00:22:25 IST 2013
Errors in file /opt/oracle/admin/+ASM/bdump/+asm2_lmon_8527.trc:
ORA-29702: error occurred in Cluster Group Service operation
LMON: terminating instance due to error 29702
A network fluctuation shouldn't give reboot like this. Then why oracle design like this way? Is this a bug? My oracle version is: 10.2.0.5.0
Could you tell me the other possible situations when 1 RC instance reboots other RAC instacne.

What you are describing is the expected behaviour: if your interconnect fails, you will have a node eviction. Releases < 11.2.0.2 evict a node by reboot, which can fix the problem: the NIC may come up correctly when the machine re-starts. Releases >= 11.2.0.2 can often evict without a re-boot. But either way, if your interconnect goes down, a node must be evicted to prevent uncoordinated disc writes.
If you are interested, you can find some discussion and demos of this in a series of webcasts I've recorded,
Free Oracle Database Tutorials for Administration and Developers
If you really don't like this behaviour and the problems are transient, you can try 'raising the CSS MISSCOUNT parameter.
John Watson
Oracle Certified Master DBA

Removing one node, re-install and join cluster 3.2/RAC/QFS

Hi all,
I have one cluster system with 2 node ( Cluster 3.2, Oracle RAC, QFS). Now one node have been failed and cannot recover. Now I have to reinstall the faulty node.
How can it removing all the faulty node from the active node?
Can I reinstall and rejoin new node to cluster?
Thanks
Nguyen

The instructions to orderly remove a node from the cluster (http://docs.sun.com/app/docs/doc/820-4679/gcfso?l=en&a=view) do assume that the cluster node itself is still healthy.
If you lost a node due to failure/disaster, then you would need to rebuild the same hardware and restore it from your backup. This is described at
http://docs.sun.com/app/docs/doc/820-4679/cfhdbgbc?l=en&a=view
Regards
Thorsten

ORA-24544 When Creating a Standby From RAC One Node

I have a RAC One Node database running on node A and am attempting to create a Data Guard standby on node B using the following RMAN command -
duplicate target database for standby from active database
Error returned is -
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of Duplicate Db command at 03/10/2015 11:11:06
RMAN-05501: aborting duplication of target database
RMAN-03015: error occurred in stored script Memory Script
RMAN-04014: startup failed: ORA-24544: Oracle RAC One Node instance is already running.
Can anyone advise ?
Thanks in advance

Hi,
ORA-24544: Oracle RAC One Node instance is already running.
Cause: An instance startup failed because an instance of the Oracle RAC One Node database was already running on one of the cluster nodes.
Action: In Oracle RAC One Node, avoid any attempt to start a second instance by any means while the instance is already running.
I have never used One Node RAC, but it looks like RMAN trying to start an offline instance of current One Node RAC on Node B.
HTH,
Pradeep

RAC One Node: downtime after HW-outage?

Hi ,
RAC One Node seems to be a good alternative compared to a "regular" RAC.
Since we don't have any experience with RAC One Node we are currently going through the available documentaion and try to get a picture of the advantages/disadvantages.
One major point is the question "what will exactly happen when an HW-failure or outage occurs?". It's my understanding - and what Oracle has documented - that the Oracle Clusterware provides failover protection to Oracle RAC One Node. If the node fails, Oracle Clusterware will automatically detect the failure and restart the Oracle RAC One Node database on another server in the pool.
In our case we would have the active node in Datacenter 1, the passive node in Datacenter 2. Therefore if the node in Datacenter 1 fails, the database should then get started on the node in Datacenter 2.
My questions now are:
- will that really automatically be done?
- what happens to the sessions which were connected to the database before the HW-failure?
- is it possible to determine how long this failover will take?
I'm sure that somebody has already tested this situation - any help will be appreciated.
Rgds
JH
Edited by: VivaLaVida on 05.12.2012 08:57

Hi,
My questions now are:
- will that really automatically be done?Yes, automatically and transparent
- what happens to the sessions which were connected to the database before the HW-failure?Depend if you are using Omotion the connection will be redirected to another node, if you are cold failover the client will be have a short downtime.
- is it possible to determine how long this failover will take?Depend of failure, but normal (could failover) is on range from 1 to 3 minutes, using (omotion- hot failover) no downtime.
Read it :
http://www.oracle.com/technetwork/products/clustering/overview/ug-raconenode-2009-130760.pdf?ssSourceSiteId=otncn
Maybe this can clarify your issues.
Any question just ask.
Regards,
Levi Pereira
Edited by: Levi Pereira on Dec 5, 2012 11:58 AM
PS: Ignore use of Omotion if you have "downtime after HW-outage". Consider only cold failover.

Oracle Applications 11i Load Balancing does not work with RAC one Node

Hi all,
Could you help me to resolve this issue.
Architecture environment is :
- One APPS tier node
- Two nodes Oracle Database Appliance (Primary node 1 holds INSTANCE_1 et Secondary node is configurured to holds INSTANCE_2), i.e RAC one Node.
- The primary node have instance_name SIGM_1 and the secondary node have instance_name SIGM_2, but in RAC one node, the secondary instance is not alive.
We convert our EBS 11i environment to RAC following note ID Using Oracle 11g Release 2 Real Application Clusters with Oracle E-Business Suite Release 11i [ID 823586.1].
When testing Database failover, Oracle Applications 11i load balancing does not work anymore.
The root cause is that, when the primary node of the Rac one node is down, the INSTANCE_NAME_1 is automaically relocating to the surviving node,.
During test failover, we imagine that when the primary node goes down, the secondary node start or relocate database with instance_name SIGM_2, and in that case the Oracle Applications load balancing works.
Currently, when the primary node goes down, the instance_name SIGM_1 is relocated on the secondary node, which cause failure of Oracle Applications Load Balancing.
Thank you for your advice.
Moussa

This is something I observed a long time ago for Safari (ie: around version 1). I'm not sure this is Safari, per se, but OpenSSL that is responsible for the behavior. I'm pretty sure Chrome does this and I've seen some Linux browsers do it.
What I have done at the last two companies I've worked for is recommend that our clients do not use SSL SessionID as the way of tracking sticky sessions on web servers, but instead using IP address. This works in nearly all cases and has few downsides. The other solution is to use some sort of session sharing on your web servers to mitigate the issue (which also means that your web servers aren't a point of failure for your users' sessions). (One of the products I supported had no session information stored on the web servers, so we could safely round-robin requests, the other product could be implemented with a Session State Server... but in most cases we just used IP address to load balance with). The other solution is to configure your load balancer to terminate the SSL tunnel. You get some other benefits from this, such as allowing your load balancer to reduce the number of actual connections to the web servers. I've seen many devices setup this way.
One thing to consider through this is that - due to the way internet standards work - this really can't be termed a bug on anyone's part. There is no guarantee in the SSL/TLS standards that a client will return the same SSL Session ID for each request and there is not requirement that subsequent requests will even use the same tunnel. Remember, HTTP is a stateless protocol. Each request is considered a new request by the web server and everything else is just trickery to try and get it to work the way you want. You can be annoyed at Safari's behavior, but it's been this way for over 5 years by my count, so I don't expect it to change.

Using RAC One Node as a primary database in a Data Guard configuration

Is it possible to use RAC One Node as a primary database in a Data Guard configuration ?
Oracle doc states: "Supports Oracle Data Guard such that you can run physical or logical standby databases on it or even we can NOT run primary databases on it either if the primary databases have DG"
I guess it is not possible but can you folks confirm?
Alessio

Hmmm.... still unclear.
I've submitted a comment which the documentation team should pick up :
"+This sentence : "Supports Oracle Data Guard such that you can run physical or logical standby databases on it or even we can NOT run primary databases on it either if the primary databases have DG"+
+is not very clear.+
+I can understand it upto the words "on it" but the second part of the sentence, beginning with "or even we can NOT ..." seems mangled and unclear.+
+Can you clarify whether RAC One Node can be used as :+
+a. A Primary in a DataGuard configuration+
+b. A Standby in a DataGuard configuration ?+"
Hemant K Chitale

RAC-DATA FILE ACCESSING ISSUE FROM ONE NODE

Dear All,
We have a two node RAC (10.2.0.3)running on Hp Unix. From yesterday onwards, from one instance accessing data from a specific data file showing the below error, whereas accessing from other node to the same datafile is working properly.
Errors in file /oracle/product/admin/tap3plus/bdump/tap3plus4_dbw0_24950.trc:
ORA-01157: cannot identify/lock data file 75 - see DBWR trace file
ORA-01110: data file 75: '/dev/vg_rac/rraw_tap3plus_temp_live05'
ORA-27041: unable to open file
HPUX-ia64 Error: 19: No such device
Additional information: 2
Tue Jan 31 08:52:09 2012
Errors in file /oracle/product/admin/tap3plus/bdump/tap3plus4_dbw0_24950.trc:
ORA-01186: file 75 failed verification tests
ORA-01157: cannot identify/lock data file 75 - see DBWR trace file
ORA-01110: data file 75: '/dev/vg_rac/rraw_tap3plus_temp_live05'
Tue Jan 31 08:52:09 2012
File 75 not verified due to error ORA-01157
Tue Jan 31 08:52:09 2012
Thanks in Advance

user585870 wrote:
We have a two node RAC (10.2.0.3)running on Hp Unix. From yesterday onwards, from one instance accessing data from a specific data file showing the below error, whereas accessing from other node to the same datafile is working properly.That would be due to some kind of failure in the shared storage layer.
RAC needs the very same storage layer to be visible and available on each RAC node - thus this needs to be some form of shared cluster storage.
Should a piece of it fails on one node, that node would not be able to access the RAC database files on that shared storage layer - and will throw the type of errors you are seeing.
So how does this shared storage layer look like? Fibre channels (HBAs) connected to a Fibre Channel Switch and SAN - making SAN LUNs available as shared storage devices?
Typically a shared storage failure would throw errors in the kernel log. This is because the error is not an Oracle error, but a kernel error. As it is in your case. The bottom error on the error stack points to the root cause:
ORA-01157: cannot identify/lock data file 75 - see DBWR trace file
ORA-01110: data file 75: '/dev/vg_rac/rraw_tap3plus_temp_live05'
ORA-27041: unable to open file
HPUX-ia64 Error: 19: No such device
So HP-UX on that node is not seeing a specific shared storage device.

Rac One Node on Rac Servers

Hi Xperts
We have this environment:
2 Rac Nodes 11.2.0.3 Enterprise on Oracle Linux 5.9 .
We have one production Database on this Rac and the users ask to create two single instance on each node, something like this:
Node1 -> Rac Prod1, Single Test
Node2-> Rac Prod2, Single Dev
I want to create Rac One node for those Database (Dev, Test) and create New Diskgroups for ech database.
Can I install a Rac One node on those Server with DBCA?
Do I nedd to Install new Database Software ?
Does the installed Rac have some affectation ?
I just want to be sure about this procedure, before to do anything.
Thank you
J.A.

Hi J.A.
Yes you can! However you need to install Grid Infrastructure (GI) in cluster on both nodes, then install database software. Either during software installation or after that, DBCA would allow you to create 1) Single instance, 2) RAC database, 3) RAC One Node database. Keep in mind that RAC One Node is an option (additional license) to the Enterprise Edition of Oracle Database.
I've talked on that topic at the Bulgarian Oracle Users Group at 2011, here is the link to the presentation, you may find it useful. I might upload the videos as well if you need to have something like a proof of concept of just for your own:
http://sve.to/download/1112/
Also I would go with one disk group for both databases, as long as they share the same physical disks I don't see the point of doing that ? Having one diskgroup would allow you to utilize better you disk/space resources.
The procedure would be:
1. Install GI in cluster.
2. Install software libraries.
3. Patch up to 11.2.0.4.
4. Create RAC One Node database using either command line or using Custom Template of DBCA.
At the end of the day, if you have standard edition license you can still install GI in cluster and create single instance databases on each server. The downside of doing that is that you need to manually failover the database to remaining node in case of disaster.
Regards,
Sve

Patch 9004119 to use Oracle RAC One Node Utilities

Hi all,
I am installing Oracle Grid Infrastructure (11.2.0.3), I am following DOC ug-raconenode-2009-130760.pdf, about RAC One Node installation, as Oracle recomendation, and this DOC talk about install patch 9004119 to use Oracle RAC One Node Utilities (such as Omotion). If I am using 11.2.0.3, is it necessary install patch 9004119 ?
Thanks in advance.
Leonardo.

user10674190 wrote:
Hi all,
I am installing Oracle Grid Infrastructure (11.2.0.3), I am following DOC ug-raconenode-2009-130760.pdf, about RAC One Node installation, as Oracle recomendation, and this DOC talk about install patch 9004119 to use Oracle RAC One Node Utilities (such as Omotion). If I am using 11.2.0.3, is it necessary install patch 9004119 ?
Thanks in advance.
Leonardo.9004119:PATCH FOR RAC ONE NODE SCRIPTS can applied only on 11.2.0.1 , As you are in 11.2.0.3 so no need of it.

11g R2 and RAC One Node

Hi,
what is realy the advantage and difference between RAC and RAC One Node, since finaly we should switch to another server if a node/instance crashes.
On IT Tips by Burleson Consulting it is said :
What makes Oracle RAC One Node special is that it performs quick clone of the instance to a new node.
Which for me means switch to another server on the RAC.
Thanks for the explanations.

- can be easily extended to multiple nodes.
- you can use "Oracle Restart" which restarts your resources automatically
- suppose you have several rac installation among your single databases you can manage a single node like you do with rac installations
Edited by: Ronny Egner on Sep 28, 2009 4:29 PM

RAC on one node...

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