Standby DB vs Data Guard

Hi all,
Is STANDBY DB the same as DATAGUARD? or there are big differences and enhancement made.
Thanks a lot

Hello;
To Data Guard is a true Standby database because it is designed for switchover and failover. I like to think of a Primary and Standby database as one database in different modes. There are other methods of Standby available but they don't provide the RMAN, DBMS_SCHEDULER and Active Data Guard ( Reader ) features or don't provide them as cleanly.
For example a month ago at my shop we had some power work in the main server room. We switched everything to the Standby and disabled the second archive location until the work was complete and then enabled it, let the archive catch up and switched back. We were down a few minutes instead of the whole weekend.
To me Data Guard has made other Standby methods obsolete, its an outstanding product for high availability.
http://www.oracle.com/us/products/database/options/active-data-guard/index.html
There are a few third party products out there, but why would you put your data and recovery in anybody's hands buts Oracle? That sounds like too many cooks to me.
Best Regards
mseberg

Similar Messages

Info on licensing issues of standby databases/Oracle Data Guard

Hi All,
Could anyone possibly give me some information on licensing issues of standby databases/Oracle Data Guard? Links to some electronic articles or journals might be useful. I am unable to find the appropriate info and need this quite urgently for my dissertation asap as my deadline is this approaching.
Thanks in advance

Paul Drake posted a reply to a similar question on the Oracle-L mailing list that pointed out that the License Agreement
http://oraclestore.oracle.com/OA_HTML/ibeCCtpSctDspRte.jsp?media=os_local_license_agreement&section=11365&minisite=10021&respid=22372&grp=STORE&language=US
states, in part,
"Failover: Your license for the following programs, Oracle Database (Enterprise Edition, Standard Edition or Standard Edition One) and Oracle Internet Application Server (Enterprise Edition, Standard Edition, Standard Edition One or Java Edition) includes the right to run the licensed program(s) on an unlicensed spare computer in a failover environment for up to a total of ten separate days in any given calendar year. Any use beyond the right granted in the previous sentence must be licensed separately and the same license metric must be used when licensing the program(s)."
which seems to open a bit of wiggle room depending on how the term "run" is defined. This is probably also an area where your Oracle sales rep may have a little more flexibility to negotiate
Justin
Distributed Database Consulting, Inc.
http://www.ddbcinc.com/askDDBC

Goldengate from physical standby with Active data guard or from logical standby - which is better?

Hi,
We have Oracle 11.2.0.4 and are currently using Active Data Guard on a physical standby. My boss wants me to use Goldengate
to replicate several schema from Oracle to SqlSserver. She doesn't want to touch the Primary, which is in production. Would it be better
to setup a Logical standby for Goldendate to use, in addition to the Physical standby? Or will it be sufficient to use the Physical standby?
The application tables don't all have primary keys. I'm trying to decide if the Logical standby adds another layer of complexity or would
introduce delays in getting the data from Oracle to Sqlserver.
Thanks in advance,

Hi,
In this case I recommend you to use physical standby + Golden gate with ALO mode. You might have sligthly more trouble in logical standby. it means you might have more trouble at Goldengate's extract side.
You said
The application tables don't all have primary keys.
so you have to add keycols on replicat side.
I recommend you to add an index which should consist of keycols columns. it will be necessary for replicat performance.
Best Regards

Difference between physical standby database and Data Guard

Hi guys,
Today I attended one interview. They asked me a difference between the Oracle Physical Standby database and Oracle Dataguard?
Upto my knowledge Oracle Physical Standby Database is one type of Standby Database can be configured using Oracle Databaguard Feature.
Can you people calrify me on this.
Regards,
Vijayaraghavan K

hello,
yes you are right upto some extent...here is para form oracle doc
Oracle Data Guard is the most effective and comprehensive
data availability, data protection, and disaster recovery solution
for enterprise databases. It provides the management, monitoring,
and automation software infrastructure to create and maintain one
or more synchronized standby databases to protect data from failures,
disasters, errors, and corruptions.
Data Guard standby databases can be located at remote disaster
recovery sites thousands of miles away from the production data center,
or they may be located in the same city, same campus,
or even in the same building. If the production database
becomes unavailable because of a planned or an unplanned outage,
Data Guard can switch any standby database to the production role,
thus minimizing downtime and preventing any data loss.oracle data guard is maximum availiblity solution which maintain physical standby databases and in case of failure of production can switch production role to and standby database.
read it here
http://www.oracle.com/technology/deploy/availability/htdocs/DataGuardOverview.html
thanks and regards
VD
Edited by: Dixit on Aug 31, 2009 1:35 AM
Edited by: Dixit on Aug 31, 2009 1:36 AM

9i RAC to single standby DB with Data guard

hello gurus,
I have a question, Im trying to set up a standby database.
The primary DB would be a two node 9i RAC R2, to a one single standby DB.
I done this already. My question is if I can use data guard with this type of configuration. I have try to configured it with OEM and the GUI does not support this.
does any one know if this can be achieve using dataguard's CLI??
thanks

well that is something out of my reach for the moment.
I have to do everything on 9i.
I have the standby environment running already, i just want to make my life easier trying to ad min this environment using data guard

Creating standby database using data guard.

Current Env:
Oracle 11.2.0.1
ASM
Size 1.7T and growing.
I'm rebuilding a standby database and need to use rman because of a few factors. In the past, I did a file copy create a standby control file config init.ora and it always worked.
We have a database and had the stanby build; but someone issued a flashback and corrupted the standby database.
Because of the size 1.7T and growing and we are now using ASM.
My research is only showing building standby through rman using dupicate database command.
I would like to copy the cold backup to a external drive and ship it to the standby site where I'll do the restore. This is because of time and bandwith required to rebuild the standby will interfere with operaitions for the period the files are being copied.
So what would be the high level steps.
1) get the cold backup
2) create the standby control file
3) ship the data via corrier
4) restore the database
5) and this is where i'm not sure. recover the standby control file - but during the restore of the database the "normal" control file will open and perhaps do a checkpoint. therefore the standby controlfile will be usless.
6) recover the standby database.
Has anyone accomplished this?
As much specifics will be helpful. This system is operational and needs to be done right the first time.
thanks,
-Rob

Thank you.
1) I'm going to off load the cold backup to an external drive and have a courier take it to the DR site.
Why, we are replicating the SAN over to the DR site. When SAN replication backs up Oracle becomes non-responsive. Therefore; sending the data over the pipe is not an option for the standby rebuild. Yea' that's the easy way to do it. But this system is operational and critical to operations; so we will not risk saturating the pipe for any period of time. The pipe got saturated one time and it was not pretty.
2) I'm running the test in my lab to make sure I can create the standby database using the cold backup and rman.
3) In the past it was easy; I got a cold backup of the data files using the same ksh scripts that have been working for 20 years. Copy the files over to the standby site, and put it into managed recovery. This technique has been working fine sense Oracle 8i days. ASM through a huge monkey wrench in the ksh script backup and now I'm forced to use rman. Hey, I'm told it's an okay product but when it comes to backups I never get fancy; that just makes things more complicated. Okay I wont complain about asm anymore, i guess there is an advantage in there somewhere.
-Rob

Switchover of a manual standby database (no data guard)

Hi all,
I have a standby database .
I am using Oracle Standard Edition 10.2.0.4 / 10.2.0.5 so I have build a manual standby .
I am able to do a failover in the case something goes wrong; I was thinking if it is possible to do a manual switchover . and failback.
Do you thick that mounting the primary database and applying ALL archivelogs and online redolog to the standby database is enough ?
Do you think this is a supported operation?
How can I check the current scn of a mounted database? (v$database.current_scn shows 0 until the database is opened )
thnk you for every answer
Andrea

helter_skelter wrote:
hi,
You can see current_scn of standby database in v$database.current_scn. It is null only on primary database if it's in mount state.that's the problem: I am unable to mount both database and to check they have the same current_scn
not all changes are written to ARL so you can't recover standby database to exact the same SCN as primaryI thinks this is because the last changes are only recorder in online redolog, so I was thinking that a possible way to simulate a clean switchover could be as follow:
1 - shutdown immediate the primary database on server prod1
2 - shutdown abort the (manual) standby database on server dr2
3 - copy archivelog, controlfiles, tempfiles, onlinelogs from primary to the standby database
3 - copy controlfiles from standby database to primary database
4 - open the database on server dr2. It should open "read write" cleanly (mount + recover from archivelog + recover from onlinelog + open noresetlogs )
5 - mount the database on server prod1. It should mount as a physical standby database.
What do you think about it?
thanks,
andrea

SID NAME FOR PRODUCTION & STANDBY DATABASE IN DATA GUARD

Hi all,
we are trying to implement Standby database (Physical) between two
sites. We have a specific question regarding this:
==> Can we have SID of both the Database SAME..? If not, why.?
-- We have two HOST & DB Details like this and would like to implement StandBy
Database:
Site-1:
Host OS: Solaris-10 3/05 SPARC
Host DB: Oracle10g R-2 10.2.0.2.0
Host DB1: IGFL
Site-2:
Host OS: Solaris-10 3/05 SPARC
Host DB: Oracle10g R-2 10.2.0.2.0
Host DB2: IGFL
Thanks & Regards,
Rishikesh

My 2 Cents:-
SID can be same.
http://download-east.oracle.com/docs/cd/B19306_01/server.102/b14239/create_ps.htm

Data guard related OS processes in Primary and Standby servers

Database version : 11.2.0.3
Operating System : RHEL 5.8
Type: Physical Standby
++++++++++++++++++++++++++++In a typical Linux server hosting a Physical standby DB, the data guard related OS processes that appear in ps output
are like below. One mrp for each standby DB.
ps -ef |grep mrp
oracle 9380     1   0   May 21 ?          57:33 ora_mrp0_STRYKER_DG
oracle 18874     1   0   May 23 ?          33:45 ora_mrp0_FLPSA
oracle 18992 18837   0 23:39:39 pts/3       0:00 grep mrpSimilarly ,In a typical Linux server hosting a Primary DB what are the data guard related OS processes that appear in ps output ? Will LNS process appear in ps output ? Any other processes ?

Similarly ,In a typical Linux server hosting a Primary DB what are the data guard related OS processes that appear in ps output ? Will LNS process appear in ps output ? Not exactly but it appears has different name, on your primary try below commands
SQL> select pid from v$managed_standby where process='LNS';
$ps -ef|grep <pid value>
hope this helps, on standby you can use same procedure to find the RFS OS process

What is the major plus with Data Guard compare to standby

Hi,
We don't need active active replication between our prod and DR, our DR can be 20 minutes RPO (Recovery Point Objective) so what is the main advantage of configuring and installing oracle data guard compare to a simple standby server?
My understanding of data guard is a that oracle will ship your log auto on the DR and apply it instead of me, doing it with 2 script (one on primary server that ship log over, the second on standby that apply the archive log).

1. Your Primary site get hit by something you can failover to the standby.
2. If you have a large group of "Reader" users on the Primary you can switch them to the Standby using Active Data Guard.
3. You can do a switchover and avoid an outage if your Primary server needs work of any kind.
4. You can preform backup at either site taking even more load off you primary if needed.
or as the books says:
Disaster recovery, data protection, and high availability.
Down Side
1. Cost
2. Network Load (or additional load)
Edited by: mseberg on Feb 7, 2011 10:23 AM

Still need to do full backup after using data guard?

In our system, there is a physical standby database in data guard configuration. Is there still a need to do full backup and incremental backup?

Jackliusr wrote:
In our system, there is a physical standby database in data guard configuration. Is there still a need to do full backup and incremental backup?Preferred to have full backup daily.
May be you can perform failover of your standby, in case there is no availability on primary database. Then do you think the standby system stability is same as primary and can give same performance?
standby location can be too far and this is only if in case of disaster.
Another case, lets suppose your standby is behind than primary for 4-5 days due to some issues. At the same time your production crashed then you may have chance to loose 4-5 days fo data. So recommended to have full backup always from primary database.
If you are checking stability of standby database daily and able to check your data by opening properly and you wont prefer to RMAN backup, Then it is fine. But it is highly recommended to have RMAN backup.
BTW, You can have RMAN full backup on standby, if you want to avoid resources to use on primary

How to access Data Guard option in Oracle 10g OEM

Hi All,
I have Oracle 10g ENTERPRISE EDITION on Unix envoirement. I want to setup logical standby Database through Data Guard technology. But when I brows through OEM I do not find Link for DATA GUARD????
1) How to access Data Guard option from oracle 10g OEM.
2) Does It come with Enterprise Edition OR I have to install it separately.
Regards,
Darshan

I am managing almost everything through EM Grid Control. It is easy to setup and configure.
Anyways, if you have read the documentation on
Oracle® Data Guard Concepts and Administration and setup your environment accordingly then you should not have any problems. Atleast I can assure you that your production database will not be affected by it.
Just make sure that you follow each step and read thoroughly. If you have spare machines then you can test and record your configuration before performing it on your production db. This link will provide you with the information on DataGuard.
http://download-uk.oracle.com/docs/cd/B19306_01/server.102/b14239/concepts.htm
If you think that way then you will never be able to do any new stuff since you will always fear that something might go wrong. Go ahead pal, try it on test machines and you will know that it is not that difficult.
There are real experts who help people like us in this forum and I know that they are doing a pretty good job.
All the best.
Rgds
Adnan

Data Guard on Oracle 9i

Good day,
I'm trying to configure standby database using Data Guard on Oracle 9i, primary database on windows xp and stand by database on W2K server, and I'm on step three of the Create Configuration Wizard. I'm trying to create a new physical standby database and when I click next then it waits a few moments then get a window that pops up and says "Data Guard remote process startup failed"
I suspect it is something to do with "Preffered Credential" settings.
Can some one guide me how to go for this, or any suggestion about the above mentioned error message.
Thanx in advance
Regards Anshuman

Thanx ADB for ur comment,
I think U have not read the questions properly, I have mentioned the version it is Oracle 9i, I know no one is paid for this forum, but i also know this forum is made to help each other incase we know about the problem other one is facing.
I will be greatfull if any one can give the solution for my problem
Thanx

Oracle 9i Backup/Restore with Data Guard Issues

Greetings,
I am currently using Oracle 9i Data Guard to have a Primary/Standby model.
The current implementation compares the backup piece id from the backed up image (taken from the Primary) with the backup piece id on the Standby db. If the number are not equal then the restore will fail.
1- Is this the best implementation for restoring on a standby?
2- Would it be better to give a permitted gap range between the backup piece ids between the two databases? and if so what would be an acceptable range?
3- In case the gap range discussed in #2 above is allowed, when the Standby is started as primary and the primary set to be standby, would the Data Guard automatically tries to retrieve all the missing archive/redo log files from the primary db?
Thanks

Hi,
I am not sure I am following you here. Are you trying to create a physical standby, by using a backup taken from the primary?
If this is what you're trying to do, you can take any hot backup from the primary and use it to sync the standby with your primary. The older the backup you're using to create the standby, the more archive logs you'll need to get synchronized.
As long as you have all the archive logs needed in the archive_log_dest, data guard will automatically retrieve all the missing logs, and apply them on the standby. Again, only if they are available on the primary.
Not sure If this is what you were asking...
Idan.

Rolling upgrade with Data Guard

I'm interesting if this table of possible upgrade from documentation (http://download.oracle.com/docs/cd/B28359_01/server.111/b28300/preup.htm#i1007814) is true, if I have a plan to do rolling upgrade with Data Guard?

I thinking no, that table does not appear to have Rolling Upgrade Information.
If I read the document correctly you can only this with a logical standby database in Data Guard.
Larry Carpenter's book has some information on this in Chapter 11.
There is also a separate Data Guard section here where you might find more information.
Data Guard
Best Regards
mseberg

Standby DB vs Data Guard

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