Data Guard vs multi-node RAC

Hi All
Unfortunately, due to my workload, I'm unable to spend any amount of time playing aroud with clusterware, RAC and ASM.
Management has asked me to look into the possibilty of switching over from our existing RAC infrastructure to something more manageable - we've had a few problems recently with RAC and it's scared a few of the senior management bods - luckily it was only a development instance but it was unrecoverable.
I mentioned the possibility of using DataGuard as an alternative to RAC for disaster recovery. My question is: does Dataguard have advantages over RAC, how manageable is it from the administration side? Physical, logical or active?
TIA

Hi,
RAC is a maily a scalability solution, which provide high availability for the database services upto some extent but definitely this is not a disaster recovery solution. I am sure there are plenty of RAC presentations floating around on the internet that you can use to explain RAC features to your management.
Have a read here
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:53900761884409
Harish Kumar
http://www.oraxperts.com

Similar Messages

Multi-Node RAC-EBS R12 document

Hi All,
I am looking for high level steps for a clone of a multi-node RAC-EBS install along with expected times.
Could someone please share such a document for R12?
Thanks for your time!
Regards,

Hi
It is mandatory to be certified for RAC clones.
Note: 783188.1 - Certified RAC Scenarios for E-Business Suite Cloning
You have not mentioned what kind of clone do you looking for whether it's Multi-Multi or Multi -Single,please see the below thread for multi to single instance
Please see this docs
Clone multi-node RAC and ASM to single node
Thanks
yakub

Migrate Single Node 10g STreams to Multi Node RAC

We are currently running 10g STreams. One capture process enqueing LCR into one queue. Propagation job dequeues messages and propagates them to a Destination queue. Then our Apply process at Destination database dequeues and apply changes.
We have developed a single shell script STREAMSsetup.sh that does all the magic on setting up streams (capture, apply, propagator and the table queues.)
Now, we are in the process of designing our new Horizontal architecture with Oracle RAC. We envision it is going to be a Data Guard Migration from Single node to the RAC environment.
My question is, can we just let Data Guard takes care of that, expecting all Streams pieces will be in place within the RAC environment? OR do you recomment we remove all streams configuration and re-run our magic script STREAMSsetup.sh to set everything up again once migrated to the RAC environment. ???
I now Streams follows an Instance Owner rule when it comes to where Capture or Apply will be started or stoped.
I would appreciate if someone have had any experience with this type of migration provide any feedback.
Thanks,
Arqui

Yes, we are opening an SR. Everything is pointing into the direction of recreating Streams configuration from RAC/ASM environment once migrated, using the instance with the lowest Instance number in the Cluster. That instance will be registered as the Primary instance owner of the Buffer queue. If primary instance fails queue ownership is transferred automatically to the next instance in the cluster and capture is started automatically in the other node.
Thanks,
ARqui

Clone multi-node RAC and ASM to single node

Hi everyone.
I need clone system with 3 application server and 2 oracle database RAC and ASM to single-node. The operating system is RHEL 5.
I see some metalink notes, but we can't found nothing. I find notes with multi-node to single-node, but nothing with RAC to non-RAC.
The eBS version is 11.5.10.2 and database version is 10.2.0.3
Is possible this clone?
Thanks very much.

Hi User;
Please follow below and see its helpful:
EBS R12 with RAC and non-RAC
Re: RAC to single instance ebs R12
Re: Clone Oracle Apps 11.5.10.2 RacDB to Non-RAC DB
Re: CLONING R12 RAC to NON RAC CLONING giving error RMAN-05517 temporary file
[b]Migrating the DB-Tier (DB and CM) to Two node non RAC cluster[/b]
Also check:
http://www.oracle.com/technology/pub/articles/chan_sing2rac_install.html
Regard
Helios

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

Data guard setup for 2 node RAC primary to 2 node RAC standby

Hi All,
I am going to setup data guard for 2 node RAC primary to 2 node RAC standby on Oracle 10.2.0.4. in AIX5L.
Can you please provide the document on the above setup which is having all the steps (details).
Also, the documents on different scenarios like
1) If one node of standby goes down, how the redo logs will be applied. IS there any problem?
2) If both nodes of standby are failed, how to reciver them?
3) If one node of primary fails, is there any issue?
4) If two nodes of primary fails, is there any issue?
Thanks in advance,
Mahi

Have a look at the following location, you may find some similar documents:
http://www.oracle.com/technology/deploy/availability/htdocs/maa.htm
By
http://www.oraxperts.com

Dataguard configuration from 2-node rac to single instance with out ASM

Hi Gurus,
Oracle Version : 11.2.0.1
Operating system:linux.
Here i am trying to configure data Guard from 2-node rac to a singled instance stanby database . I have done all the changes in the parameter file for both primary and stand by database and when i am trying to duplicate my target database it is giving error as shown below.
[oracle@rac1 dbs]$ rman target / auxiliary sys/qfundracdba@poorna
Recovery Manager: Release 11.2.0.1.0 - Production on Thu Jul 21 14:49:01 2011
Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved.
connected to target database: QFUNDRAC (DBID=3138886598)
connected to auxiliary database: QFUNDRAC (not mounted)
RMAN> duplicate target database for standby from active database;
Starting Duplicate Db at 21-JUL-11
using target database control file instead of recovery catalog
allocated channel: ORA_AUX_DISK_1
channel ORA_AUX_DISK_1: SID=63 device type=DISK
contents of Memory Script:
   backup as copy reuse
   targetfile '/u01/app/oracle/product/11.2.0/db_1/dbs/orapwqfundrac1' auxiliary format
'/u01/app/oracle/product/11.2.0/db_1//dbs/orapwpoorna'   ;
executing Memory Script
Starting backup at 21-JUL-11
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=10 instance=qfundrac1 device type=DISK
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of Duplicate Db command at 07/21/2011 14:49:29
RMAN-03015: error occurred in stored script Memory Script
RMAN-03009: failure of backup command on ORA_DISK_1 channel at 07/21/2011 14:49:29
ORA-17629: Cannot connect to the remote database server
ORA-17627: ORA-01017: invalid username/password; logon denied
ORA-17629: Cannot connect to the remote database serverHere i was able to connect to my auxiliary database as shown below
[oracle@rac1 dbs]$ rman target /
Recovery Manager: Release 11.2.0.1.0 - Production on Thu Jul 21 15:00:10 2011
Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved.
connected to target database: QFUNDRAC (DBID=3138886598)
RMAN> connect auxiliary sys/qfundracdba@poorna
connected to auxiliary database: QFUNDRAC (not mounted)Can any one please help me .
Thanks & Regards
Poorna Prasad.S

Hi All,
Can any one please find out my both the parameters file and tell me if any thing is wrong.
Primary Database parameters.
qfundrac1.__db_cache_size=2818572288
qfundrac2.__db_cache_size=3372220416
qfundrac1.__java_pool_size=16777216
qfundrac2.__java_pool_size=16777216
qfundrac1.__large_pool_size=16777216
qfundrac2.__large_pool_size=16777216
qfundrac1.__oracle_base='/u01/app/oracle'#ORACLE_BASE set from environment
qfundrac2.__oracle_base='/u01/app/oracle'#ORACLE_BASE set from environment
qfundrac1.__pga_aggregate_target=4294967296
qfundrac2.__pga_aggregate_target=4294967296
qfundrac1.__sga_target=4294967296
qfundrac2.__sga_target=4294967296
qfundrac1.__shared_io_pool_size=0
qfundrac2.__shared_io_pool_size=0
qfundrac1.__shared_pool_size=1375731712
qfundrac2.__shared_pool_size=855638016
qfundrac1.__streams_pool_size=33554432
qfundrac2.__streams_pool_size=0
*.audit_file_dest='/u01/app/oracle/admin/qfundrac/adump'
*.audit_trail='db'
*.cluster_database=true
*.compatible='11.2.0.0.0'
*.control_files='+ASM_DATA2/qfundrac/controlfile/current.256.754410759'
*.db_block_size=8192
*.db_create_file_dest='+ASM_DATA1'
*.db_create_online_log_dest_1='+ASM_DATA2'
*.db_domain=''
*.DB_FILE_NAME_CONVERT='/u02/poorna/oradata/','+ASM_DATA1/','/u02/poorna/oradata','+ASM_DATA2/'
*.db_name='qfundrac'
*.db_recovery_file_dest_size=40770732032
*.DB_UNIQUE_NAME='qfundrac'
*.diagnostic_dest='/u01/app/oracle'
*.dispatchers='(PROTOCOL=TCP) (SERVICE=qfundracXDB)'
*.fal_client='QFUNDRAC'
*.FAL_SERVER='poorna'
qfundrac2.instance_number=2
qfundrac1.instance_number=1
*.LOG_ARCHIVE_CONFIG='DG_CONFIG=(qfundrac,poorna)'
*.LOG_ARCHIVE_DEST_1='LOCATION=+ASM_FRA VALID_FOR=(ALL_LOGFILES,ALL_ROLES) DB_UNIQUE_NAME=qfundrac'
*.LOG_ARCHIVE_DEST_2='SERVICE=boston ASYNC VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=poorna'
*.LOG_ARCHIVE_DEST_STATE_1='ENABLE'
*.LOG_ARCHIVE_DEST_STATE_2='ENABLE'
*.LOG_ARCHIVE_FORMAT='%t_%s_%r.arc'
*.LOG_ARCHIVE_MAX_PROCESSES=30
*.LOG_FILE_NAME_CONVERT='/u02/poorna/oradata/','+ASM_DATA1/','/u02/poorna/oradata','+ASM_DATA2/'
*.open_cursors=300
*.pga_aggregate_target=4294967296
*.processes=300
*.remote_listener='racdb-scan.qfund.net:1521'
*.REMOTE_LOGIN_PASSWORDFILE='EXCLUSIVE'
*.sec_case_sensitive_logon=FALSE
*.sessions=335
*.sga_target=4294967296
*.STANDBY_FILE_MANAGEMENT='AUTO'
qfundrac2.thread=2
qfundrac1.thread=1
qfundrac1.undo_tablespace='UNDOTBS1'
qfundrac2.undo_tablespace='UNDOTBS2'and my standby database prameter file.
poorna.__db_cache_size=314572800
poorna.__java_pool_size=4194304
poorna.__large_pool_size=4194304
poorna.__oracle_base='/u01/app/oracle'#ORACLE_BASE set from environment
poorna.__pga_aggregate_target=343932928
poorna.__sga_target=507510784
poorna.__shared_io_pool_size=0
poorna.__shared_pool_size=176160768
poorna.__streams_pool_size=0
*.audit_file_dest='/u01/app/oracle/admin/poorna/adump'
*.audit_trail='db'
*.compatible='11.2.0.0.0'
*.control_files='/u01/app/oracle/oradata/poorna/control01.ctl','/u01/app/oracle/flash_recovery_area/poorna/control02.ctl'
*.db_block_size=8192
*.db_domain=''
#*.db_name='poorna'
#*.db_recovery_file_dest='/u01/app/oracle/flash_recovery_area'
*.db_recovery_file_dest_size=4039114752
*.diagnostic_dest='/u01/app/oracle'
*.dispatchers='(PROTOCOL=TCP) (SERVICE=poornaXDB)'
*.local_listener='LISTENER_POORNA'
*.memory_target=849346560
*.open_cursors=300
*.processes=150
*.remote_login_passwordfile='EXCLUSIVE'
*.sec_case_sensitive_logon=FALSE
*.undo_tablespace='UNDOTBS1'
############### STAND By PARAMETERS ########
DB_NAME=qfundrac
DB_UNIQUE_NAME=poorna
LOG_ARCHIVE_CONFIG='DG_CONFIG=(poorna,qfundrac)'
#CONTROL_FILES='/arch1/boston/control1.ctl', '/arch2/boston/control2.ctl'
DB_FILE_NAME_CONVERT='+ASM_DATA1/','/u02/poorna/oradata/','+ASM_DATA2/','/u02/poorna/oradata'
LOG_FILE_NAME_CONVERT= '+ASM_DATA1/','/u02/poorna/oradata/','+ASM_DATA2/','/u02/poorna/oradata'
LOG_ARCHIVE_FORMAT=log%t_%s_%r.arc
LOG_ARCHIVE_DEST_1= 'LOCATION=/u02/ARCHIVE/poorna VALID_FOR=(ALL_LOGFILES,ALL_ROLES) DB_UNIQUE_NAME=poorna'
LOG_ARCHIVE_DEST_2= 'SERVICE=qfundrac ASYNC VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=qfundrac'
LOG_ARCHIVE_DEST_STATE_1=ENABLE
LOG_ARCHIVE_DEST_STATE_2=ENABLE
REMOTE_LOGIN_PASSWORDFILE=EXCLUSIVE
STANDBY_FILE_MANAGEMENT=AUTO
FAL_SERVER=qfundrac
FAL_CLIENT=poornaThanks & Regards,
Poorna Prasad.S

Any Benefits of Extended RAC Over Data Guard?

Hi,
My company is in the process of setting a second data center, a bit far from the current one (about 20 KM).
This Data Center will be used as a DR site, as well as to accommodate additional servers since the current Data Center is already stretched.
We're currently running about 5 RAC clusters, two nodes each on Oracle 11g and on AIX plaforms. It's not yet decided what type of technology will be employed with the databases - whether RAC with Data Guard (DG) or Extended RAC.The network link will be fairly good, a dark fiber link.
Does anyone have a suggestion as to which of the above technology would be preferable? With Extended RAC I think we are able to continue operating from the second site without needing to 'failover' as such, while with DG, we probably will need to put in place an elaborate failover procedure, even though we can use the Fast-Start-Automatic failover feature of 10g Rel2 and above.
Any thoughts/suggestions/clarifications?
Dula
Edited by: dula on Aug 28, 2009 2:47 PM

Hi Dula,
Even some time back we were also consdering the same to use remote DG for disaster recovery solution (active-passive) to create extended RAC on a remote site and then make use of those remote servers for the purpose of disaster reocovery and also make those servers connect to the PROD application servers thus making a (active-active) clustering solution.
Management wanted to look into the feasibility of using active-active nodes on remote sites which they thought will help them make use of remote servers to connect to the LIVE applicatio. With the active-passive mode where there was just standby servers in recovery mode on remote site they were of the opinion that why to waste power for remote servers and why not use them in LIVE site.
We thought of using the dense optic fiber for the DB replication to remote RAC nodes and also for our 30+ application servers to connect from site 1 to site 2( site 2 will be remote site with extented rac nodes hosted).
However there were many reservations that came which making decission. First was that we could not find any reliable source of group who had successfully implemented this active-active remote extended rac nodes in production. The cost of dense optic fiber was another consideration. How the interconnects will perform in remote sites was another grey area for us. Also since the application servers uses TAF to connect to DB servers it was not known that how the sessions from the same application servers(web based applications) to local and remote nodes will have performance impact. With so many grey areas we dropped the idea of using extended rac nodes and went ahead with DG solution.
Amar

Important Data Guard informations

I'm reading some white papers on data guard and also the Oracle documentations, but I still don't have found what I'm searching...
I've two environments... a 3 nodes RAC (10gr2, 10.2.0.4.0) and a 2 nodes RAC (11g, still never patched).
I would like to realize a data guard configuration formed by 3 nodes as primary site and the 2 nodes as standby site.
This is what I've planned:
- upgrade 3 nodes from 10g to 11g
- apply latest oracle patches for 11g on 3 nodes and 2 nodes
- move current schema (there's only one schema) from 2 nodes to 3 nodes (there are only two schemas)
- prepare the 2 nodes to be used as standby database
- mode to data guard configuration
My questions are:
1) Is it possible to use 3 nodes as primary database and 2 nodes as standby database ? I mean... Is it possible to have two sites that are not identical ?
I just can image that 2 nodes as standby database don't provide for the same service performance profile in case of a failover, but for current traffic 2 nodes are really enough.
2) In case of a disaster on primary site, the failover starts automatically or I need to manually start the standby database ? If there's a way to automatically start the standby database, I'm expecting this is completely transparent to applications connected to the database, at least to the new connections... is it right ?
3) If there's a need to apply a patch at clusterware level, use of a data guard configuration allows me to have an "always available" database ?
I mean... some patches (especially those for clusterware level) are not available for "rolling upgrade" and I need to shutdown my instance: on a data guard configuration (formed by RAC sites) is this still true ?
Thanks.

I don't know all the answers but here is some to get the thread started:
My questions are:
1) Yes, it is possible to have different number of nodes for your primary and standby sites...meaning a 3 node primary can have a dataguard configuration to a 2 node.
2) Yes, you can configure something labeled fast-start failover and I beleive it is incorporated in with dataguard broker. I'm not sure about this being transparent to the user, if they use apps. that rely on clusterware service availabillty will see a temporary suspension of service during the role change.
3) This I'm unsure of but want to say that it should be possible to do a role switch and bring a site down to patch and then resume operation, resolve the gap and do another role switch. I say I think it should be possible because it is possible to have dataguard from a rac database to a standalone so in that instance you are running differently.

9ir2 Single Node RAC + RH80

Hi all.
I'm triying to install a single node RAC based in the single node rac for linux document in the metalink.
The document was made based in a oracle 9iR1 database an RH71, I have followed the steps and i have a working kernel made by my own, the raw devices, and softdog hacked for being testing only. But the service does not go up.
I don't know if someone have made a single node rac instalation and can help me to choose the right pieces.
I don't have a RHAS2.1 but I do have a UnitedLinux 1.0 Server Patched.
I want to try the RAC tech but here (ecuador-sudamerica) is dificult to find firewire cards and disks so I´m working around a single node instalation.
Any help will be apreciate.
Fernando

Hi
Database version and GI versions are 11.2.0.2.2. And these are not multinode RAC configuration at any given time only single instance will be there for any given database. Some thing like ACTIVE and PASSIVE in hardware clusters such are VCS (Veritas Clusters).
I agree with you failover sinario in multi node (2 or more) RAC environments. In single node clustering only one instance will be there, like services in multinode, here whole instance will be re created on available nodes.
Hi
Database version and GI versions are 11.2.0.2.2. And these are not multi node RAC configuration at any given time only single instance will be there for any given database. Some thing like ACTIVE and PASSIVE in hardware clusters such are VCS (VERITAS Clusters).
I agree with you failover scenario in multi node (2 or more) RAC environments. In single node clustering only one instance will be there, like services in multi node, here whole instance will be re created on available nodes.
Thanks,
Thanks,

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

Data Guard configuration for RAC database disappeared from Grid control

Primary Database Environment - Three node cluster
RAC Database 10.2.0.1.0
Linux Red Hat 4.0 2.6.9-22 64bit
ASM 10.2.0.1.0
Management Agent 10.2.0.2.0
Standby Database Environment - one Node database
Oracle Enterprise Edition 10.2.0.1.0 Single standby
Linux Red Hat 4.0 2.6.9-22 64bit
ASM 10.2.0.1.0
Management Agent 10.2.0.2.0
Grid Control 10.2.0.1.0 - Node separate from standby and cluster environments
Oracle 10.1.0.1.0
Grid Control 10.2.0.1.0
Red Hat 4.0 2.6.9-22 32bit
After adding a logical standby database through Grid Control for a RAC database, I noticed sometime later the Data Guard configuration disappeared from Grid Control. Not sure why but it is gone. I did notice that something went wrong with the standby creation but i did not get much feedback from Grid Control. The last thing I did was to view the configuration, see output below.
Initializing
Connected to instance qdcls0427:ELCDV3
Starting alert log monitor...
Updating Data Guard link on database homepage...
Data Protection Settings:
Protection mode : Maximum Performance
Log Transport Mode settings:
ELCDV.qdx.com: ARCH
ELXDV: ARCH
Checking standby redo log files.....OK
Checking Data Guard status
ELCDV.qdx.com : ORA-16809: multiple warnings detected for the database
ELXDV : Creation status unknown
Checking Inconsistent Properties
Checking agent status
ELCDV.qdx.com
qdcls0387.qdx.com ... OK
qdcls0388.qdx.com ... OK
qdcls0427.qdx.com ... OK
ELXDV ... WARNING: No credentials available for target ELXDV
Attempting agent ping ... OK
Switching log file 672.Done
WARNING: Skipping check for applied log on ELXDV : disabled
Processing completed.
Here are the steps followed to add the standby database in Grid Control
Maintenance tab
Setup and Manage Data Guard
Logged in as sys
Add standby database
Create a new logical standby database
Perform a live backup of the primary database
Specify backup directory for staging area
Specify standby database name and Oracle home location
Specify file location staging area on standby node
At the end am presented with a review of the selected options and then the standby database is created
Has any body come across a similar issue?
Thanks,

Any resolution on this?
I just created a Logical Standby database and I'm getting the same warning (WARNING: No credentials available for target ...) when I do a 'Verify Configuration' from the Data Guard page.
Everything else seems to be working fine. Logs are being applied, etc.
I can't figure out what credentials its looking for.

Steps for data guard RAC primary RAC standby

Hi,
I have some doubt in configuring data guard for rac DR to rac primary.
1) In RAC DR, physical standby will be in RAC before starting data guard for RAC Primary , right?.
2) While configuring RAC DR , should one node be down in standby?.
3) After creating the auxiliary database in standby, i mean restoring the rman backup from staging directory in DR,
Shall we have to register the services(database,instance,asm,etc..) to CRS(OCR)?. If yes ,Why?.
4) After DR configure over , Shall i shut/down one node?. Should all the nodes in DR be in up , while applying logs to
standby ?.
If anybody have made the setup and have the prepared document , requesting you to share with me.
Thank you very much,
Sunand

Hi Sunand,
Please follow the following My Oracle Support (MOS) Document ID:
MAA - Creating a RAC Physical Standby for a RAC Primary [ID 380449.1]
For further details, see the referred documents in previous post. Try practicing on VMWare because it will give you the flexibility for creating snapshots to save your work. Please see the answers for your question below:
Q1. In RAC DR, physical standby will be in RAC before starting data guard for RAC Primary , right?.
Answer: Yes, this is recommend but not mandatory. You can add a second node later on.
Q2. While configuring RAC DR , should one node be down in standby?
Answer: Yes, there are some database configuration commands that should be run in exclusive mode. You can start the remaining instance(s) after DB creation. Do not forget to set CLUSTER_DATABASE parameter to TRUE. Also, all instances except one should be close while performing switchover/failover.
Q3. After creating the auxiliary database in standby, i mean restoring the rman backup from staging directory in DR, Shall we have to register the services(database,instance,asm,etc..) to CRS(OCR)?. If yes ,Why?
Answer: Yes, this is recommended for RAC configuration to take advantage of high availability services.
Q4. After DR configure over , Shall i shut/down one node?. Should all the nodes in DR be in up , while applying logs to
standby ?
Answer: You can start up all the instances after DR creation. In this case if your one node goes down log apply services will continue to apply changes in DR.
Hope, this helps to clear your questions.
Regards,
Shahid

Data guard performance problem (rac to single instance)

i have a table it has GPS data, and gps table has too many data, 5 millions,
iam using RAC (2 nodes 11gr2). standby database is single instance data guard,
single instance database (standby)'s hardware cpu is lower than RAC machines. rac nodes have (15k) disks, standby has (7200rpm),
so i dont want to use GPS tables on data guard system, i dont want to run GPS table's DML commands (delete, insert), i think it may increase performance,
is it posible? what is your advise?
any feedback makes me happy,
best regards

it's not possible with data guard, but you can use streams or golgengate for this purpose. Have a look at dataguard performance tuning guide. Maybe there is something you can fix on the configuration to be faster.
[Data Guard Redo Apply and Media Recovery Best Practices|http://www.oracle.com/technetwork/database/features/availability/maa-wp-10grecoverybestpractices-129577.pdf]
[Redo Transport and Network Best Practices|http://www.oracle.com/technetwork/database/features/availability/maa-wp-11gr1-activedataguard-1-128199.pdf]
I don't know an 11g version for these docs but they would still help.

Oracle RAC / Logical Data Guard causing network problems on VMware

We have VMWare 5.0 cluster across the 12 blades (6 per chassis) running a mixture of Red Hat and Windows 2008 R2 vms. The Red Hat boxes are two times two node Oracle RAC (primary and secondary), also apache web servers and jboss application servers. The Windows servers are for AV/DC/Management/Monitoring.
The problem is that intermittent network connectivity to random Windows and Red Hat boxes occur when the Oracle RAC builds up archive logs and then ships / applies them to the secondary nodes, between ESX nodes either on different blades in the same chassis or across the chassis and even when all RAC nodes are on the same ESX host.
We are using NFS, Oracle 11g and Red Hat 6.2.
Sorry if this info is a bit vague, im not an Oracle expert! :-)
thanks,
Dave

Hi,
1.) The calculation for Standby RedoLogs is:
(Max Number of Logfiles per thread (Instance) +1) * Max Number of Threads (Instances))
So if you have 4 Redo Log Groups on your primary (which is 2 Redo Log Groups per Instance), then it ends up:
(2 +1) * 2 = 6
So actually you will only need 6 standby redo logs, not 8. But 2 more don't harm.
Your primary will need exactly the same number (6 or in your case 8). Which will be 3 per thread/instance or in your case 4.
2.) The SID List in the listener.ora is a listing of SIDs the Listener is listening on. It is not the listener name.
Hence it is not "lsnrctl guard_dgmgrl start" but only "lsnrctl LISTENER start", whereas the LISTENER is the default and "lsnrctl start" would be sufficient.
However since this is grid infrastructure with the listener running out of ASM home, be sure to have set your environment to GI Home not to DB_HOME for the listener.ora entries, but to DB_HOME for the tnsnames.ora entries necessary for data guard.
And since listener is running under clusterware you should use "srvctl stop listener" and start.
Last but not least the SID entries for dataguard have to use DGMGRL not dgmgrl.
3.) Here is the whitepaper you are looking for:
www.oracle.com/goto/maa
Also for client failover best practices.
(Here the direct link to the RAC whitepaper):
http://www.oracle.com/technetwork/database/features/availability/maa-wp-10g-racprimarysingleinstance-131970.pdf
However since this is 10g you should combine this with the 11g RAC standy paper (e.g. SCAN Listener setup).
Sebastian

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