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

Similar Messages

Implemeting 11gR2 RAC with Data Guard

Hi ,
Could any one provide the steps on how to setup 11gR2 two node RAC With Dataguard . Could the 11R2 Active database duplication can be used in setting up the standby ?
I just need the order of steps to be followed to set up the environment.
Thanks,
shashi.

Hi Fiedi ,
Thanks for the reply .
I know how to build the oracle dataguard . But , I'm looking for the order of steps that I need to follow to build 11gR2 RAC with data guard.
1] Set up the Grid Infrsatructure for the 2 node RAC .
2] Create the database .
3] Modify the init.ora prameter to chage the above created database as primary .
4] Set up the grid infrastructure for the 2 node RAC on the DR site.
5] Create the standby database using 11gR2 active database dupication.
Is the above order correct ? If not , let me know the correct order of steps that needs to be followed to setup 11gR2 RAC with dataguard.

Recomendation: RAC + ASM + Data Guard

Hi all:
I need to implement a Data Guard in my 2 nodes RAC Database.
How I make the ASM instance in the remote host?? I'm not found any documentation...
Please, any sugestion.
Thanks a lot.

Use the same installation procedure as you used for RAC.
Check these example instructions for Linux.
:p

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

Is there any way to extend the roaming data expiration period?

The title says it all:)
Is there any way to extend the 30-days roaming data expiration period?

No, this is not controllable directly by apps or by users (and 30-days is not contractual).
If your app needs to store data in the cloud perpetually then you'll need to use your own server.
If the app is installed then roamed data will still be saved on the client systems until the user removes it.

Any benefits to using Ext4 over Ext2 on SSD, or USB flash drive?

Hi.
I've been using Linux on, and off, again for about two years now, and I never really bothered using anything outside of the extn file systems.
I had at one point only used ext2 only on usb installs, and usually on temporary installs of RIPLinux, Parted Magic, or Puppy Linux.
But... now we have the option to disable journaling with tune2fs, or at the very least mounting the partition with options 'noatime', 'barrier=0', or 'nobh', should we use ext4 for any of these devices?
Are there any ext4 improvements over ext2/3 that would actually apply to SSDs, or other flash devices?
Right now I'm currently running Arch from an USB. It's being used to stream media to a video game console, download files in the 200 - 500 MB range, and act as my media viewer for movie files. ie - mpeg, mp4, mkv, and flv. My original idea was to have a future proof system setup that I could eventually clone over to my replacement hard-drive when it comes in the mail.
Should I just make the switch back to ext2, or does ext4 have benefits over ext2 on these types of devices?
While I'm considering a persistent journal disable, my only Arch partition is mounted as follows in the fstab.
UUID=546043fd-170f-4ed4-8af0-136113627e8c / ext4 defaults,noatime,barrier=0 0 1
tmpfs /tmp tmpfs defaults,noatime,mode=1777 0 0
tmpfs /var/tmp tmpfs defaults,noatime,mode=1777 0 0
tmpfs /var/lock tmpfs defaults,noatime,mode=1777 0 0
tmpfs /var/run tmpfs defaults,noatime,mode=755 0 0
tmpfs /var/cache/pacman/pkg tmpfs defaults,noatime 0 0
tmpfs /var/abs/local/yaourtbuild tmpfs defaults,noatime 0 0

midenok,
Welcome to Arch Linux. Take note that this is an old thread (but not overly so). When reviving old threads, we generally encourage creating a new thread and linking to the old. In this case, your answer is pertinent to the thread, and that thread had not reached a logical conclusion, so you are fine. I just wanted to drop this note so others know that a moderator has seen it.
Again, welcome.

R12 - RAC or Data Guard ????

Hi,
Can anybody tell which version of R12 good.
One of our clients wants to implement only HRMS module.
Can anybody suggests me the severs (H/W requirements).
Which is good Data Gurad / RAC ..
Thanks

Hi,
Please install the latest available version, that is Release 12.1.2 (as of now)
_Oracle E-Business Suite Readme, Release 12.1.2 [ID 949406.1]_
Oracle E-Business Suite Release 12.1.2 is currently available on My Oracle Support as Patch 7303033. This patch needs to be applied on top of
Oracle E-Business Suite Release 12.1.1
Refer the following document with respect to HRMS Module :-
_Known HRMS Issues for 12.1.2 Maintenance Pack [ID 972562.1]_
With respect to High availabiliy RAC/Dataguard
============================
Refer the following documents :-
_Oracle E-Business Suite Release 12 High Availability Documentation Roadmap [ID 1072636.1]_
_Using Oracle 11g Release 2 Real Application Clusters and Automatic Storage Management with Oracle E-Business Suite Release 12 [ID 823587.1]_
_Business Continuity for Oracle E-Business Release 12 Using Oracle 11g Physical Standby Database [ID 1070033.1]_
Hardware Requirements
===============
Because there are different product combinations, different user profiles, and different configurations, there is no one sizing answer for all hardware platforms. Some
hardware vendors have sizing worksheets that model the CPU and memory requirements of Oracle Applications on their hardware. The most reliable strategy to ensure that the hardware is sized appropriately is to install a test environment, and then set a benchmark with a configuration, product mix, and user load that simulates your own current and expected workloads. These "actual" conditions can help verify performance before you install your production-ready environment. If such a benchmark is not feasible, Oracle Consulting Services and your hardware vendor can help you find another Oracle Applications system running a product mix and user profile similar to yours.
- Famy
Edited by: user600239 on 29 May, 2010 11:25 PM

Oracle11g R2 Active Data guard using ASM Problem?

I have configured oracle11g r2 RAC on 2 notes using ASM Grid ( OS unix).
RAC is up and running.
Now I am configuring Active data Guard.
Under grid user instance +ASM and listener is running.
Under oracle user static listener is running.
All disk is mounted.
Oracle RAC and Data Guard directory and structure I have keeped same.
Now my problem is below:
$ ./rman target sys/HPinvent123nbl@dcpdb AUXILIARY sys/HPinvent123nbl@drpdb
Recovery Manager: Release 11.2.0.1.0 - Production on Wed Jan 16 16:28:32 2013
Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved.
connected to target database: DCPDB (DBID=316773134)
connected to auxiliary database: DRPDB (not mounted)
RMAN> duplicate target database for standby from active database;
Starting Duplicate Db at 16-JAN-13
using target database control file instead of recovery catalog
allocated channel: ORA_AUX_DISK_1
channel ORA_AUX_DISK_1: SID=5644 device type=DISK
contents of Memory Script:
backup as copy reuse
targetfile '/u02/app/oracle/product/11.2.0/dbhome_1/dbs/orapwdcpdb1' auxiliary format
'/u02/app/oracle/product/11.2.0/dbhome_1/dbs/orapwdrpdb' ;
executing Memory Script
Starting backup at 16-JAN-13
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=1897 instance=dcpdb1 device type=DISK
Finished backup at 16-JAN-13
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of Duplicate Db command at 01/16/2013 16:28:48
RMAN-06136: ORACLE error from auxiliary database: ORA-00200: control file could not be created
ORA-00202: control file: '+data'
ORA-17502: ksfdcre:4 Failed to create file +data
ORA-15001: diskgroup "DATA" does not exist or is not mounted
ORA-15055: unable to connect to ASM instance
ORA-01031: insufficient privileges
RMAN>
Please help.\
Thanks
Solaiman

root@drpdb1 []# id oracle
uid=108(oracle) gid=700(oinstall) groups=701(dba)
root@drpdb1 []# id grid
uid=109(grid) gid=700(oinstall) groups=701(dba),702(asmdba)
Edited by: 876149 on Jan 16, 2013 3:19 AM

Oracle Replication - Encrypted Data and Oracle Data Guard

We are working on a high availability architecture for one of our new projects. The preliminary architecture has Oracle 10g Release 2(10.2.0.2) production database (primary database) running on Solaris10 server for OLTP operations. And a production replicated database (standby database) is running on another node running on Solaris10 server for reporting, ETL data extractions etc. The plan is to implement Oracle data guard (DG) to replicate data between primary database and standby database (logical standby database). As a side note, there is going to be one to two minute time log for data synchronization between primary and standby databases.
We need to encrypt sensitive data (like SSN, Credit Card No. etc) in the primary production database. Initially we thought this can be achieved by using Oracle Transparent Data Encryption (TDE), this is a new encryption method Oracle came up with their 10g version. But the issue here is Oracle TDE doesnt support setting up the logical standby database (using Oracle data Guard) for reporting on the second node. I have confirmed with Oracle on this, so we are kind of stuck in the middle on this new requirement. So our next option is to look out for any third party vendors who can resolve this puzzle, and looking for your help for any suggestions.
· Do you know any vendor who can support both data encryption and data replication for Oracle databases?
· Do you know any vendor who can support just data encryption for Oracle databases?
(I am thinking if we can find a vendor, we would like to ask them if they have any technical issues working with Oracle data guard for data replication and use some kind of technique to decrypt the data on the standby/reporting database.)

You can always use the DBMS_CRYPTO or DBMS_OBFUSCATION_TOOLKIT to encrypt the data rather than using TDE. You may have to do some work on the key management side, though, but it shouldn't be too painful.
Justin

10g Data Guard Install Questions... Solaris 9

Firstly, I've done several Failsafe installes on Wintel platforms, but I'm having a tough time getting started installing Dataguard on Solaris. According to the manual:
Oracle® Data Guard Broker
10g Release 1 (10.1)
Part Number B10822-01
"The Oracle Data Guard graphical user interface (GUI), which you can use to manage broker configurations, is installed with the Oracle Enterprise Manager software."
I don't see any link or otherwise access to Data Guard via the 10g Enterprise Manager. Is there something that I missed during install that will allow me access Data Guard GUI?
I'm stuck
http://download-east.oracle.com/docs/cd/B14117_01/server.101/b10822/concepts.htm#sthref14

rajeysh wrote:
refer the link:- hope this will help you.
http://blogs.oracle.com/AlejandroVargas/gems/DataGuardBrokerandobserverst.pdf
http://oracleinstance.blogspot.com/2010/01/configuration-of-10g-data-guard-broker.html
http://gjilevski.wordpress.com/2010/03/06/configuring-10g-data-guard-broker-and-observer-for-failover-and-switchover/
Good luck.
SQL> show parameter broker
NAME                                 TYPE        VALUE
dg_broker_config_file1               string      /u03/KMC/db/tech_st/10.2.0/dbs
                                                 /dr1KMC_PROD.dat
dg_broker_config_file2               string      /u03/KMC/db/tech_st/10.2.0/dbs
                                                 /dr2KMC_PROD.dat
dg_broker_start                      boolean     FALSE
SQL>so i need only:
ALTER SYSTEM SET DG_BROKER_START=true scope=both;only to act in dgmgrl.
please confirm me ......

Oracle10gR2-Data Guard

I want to configure Oracle10gR2 Data Guard for the following scenario:
•     In a Data Guard environment, we want to configure One Primary Server and Two Standby databases.
•     The Primary server will be using the internal hard drives for storage (operating system, Oracle, production database, logs, etc).
•     The First Standby database server will be connected to the Primary Server on LAN. This server will be using the SAN as its storage. The internal drives will be used for the operating system only.
•     The Second Standby Database would be hosted in a Remote site and connected through Optical Fiber. This database server will also use SAN as its storage.
Any body can help me out if there are any issues regarding SAN in a data guard environment?
Regards

No issues.

Help for configuring Data Guard Broker

Hi All,
Can any body help me in configuring data guard broker for oracle 9i on windows.
What are all requirements needed. I already configured physical standby database.
I did this is on my laptop using vm-ware. One node is having Primary database and
second node is having standby database. Now I am planning to use DG broker on primary node.
Regards
Kiran

Here's the help you need:
http://tahiti.oracle.com.
Without version information (what does 9i mean?) no further help is possible.
Please also be advised that VMware is unsupported so if you run into issues you are on your own.

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.

Any Benefits of Extended RAC Over Data Guard?

Similar Messages

Maybe you are looking for