Standby of another standby??

Hi!!!
I have in my mind a structure of standbys, but i don't know if it is possible....
Do you know if i can create a physical logical standby from a physical standby??
If i can, the procedure of creation would be the same one that the creation a logical standby?
thanks for the info!!!!

Yes, you can have archived redo logs from the first physical standby(let us call it standby1) to new standby(let us call it standby2) after after it receives from primary.
This is how you do it.
1.On standby1 create standby redo logs same size as primary.
Does not have to be same numbe of groups.
If primary has 6 groups you can create 3 groups on standby1.
2. in standby1 init.ora file.
log_archive_dest_2 = 'service=standby2 optional reopen=60 max_failure=10
Must use arch process.
standby_archive_dest=local (local archive log destination)
3. in standby2 init.ora file
standby_archive_dest=local (your local archive log destination)
Server=standby1
client=standby2
Hope this helps.
Message was edited by:
user539835

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Create standby from another standby!

Dear All,
My database is 10gR2 and OS is Red Hat Enterprise Linux 4.
I have an existing setup of primary database and standby database that is working fine.
I want to add another standby database but i can only make changes to the existing stand by database, not want to disturb or restart primary database. I want to say i want to create a standby database for another standby database that is not in an open mode.
I have tried my best to search the scenario on net but couldn't find any help. Please refer an article or document which can help me.
Regards, Imran

Handle:     misterimran
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Yet another standby question...

Hi gurus,
Please help to resolve the quiz. I have completed manual physical standby installation. It is up and running. I then decided to install Grid Control and to use Data Guard for the standby creation. I've successfully installed GC, deployed all agents, I can see my previous standbys, life is good in short. Now, when I am trying to create the second standby for my production database using the Data Guard I stuck on a logical question:
On the step 3 of Data Guard standby creation, there is a note, saying:
The instance name (also referred to as the SID) must be unique on the standby host.
Yeah, fair enough. But i can't understand what should I do next? I have:
db_name YELLOW - primary prod
db_name YELLOW - standby prod 1st
and i need db_name YELLOW - standby 2nd
But I can't create it on the same server where the first standby resides.. What options do I have? Do I need to create the second standby on another server? Do I need to kill 1st standby? Is there any way to avoid this conflict? I am confused. I have no equipment for TWO standby servers... I thought I can install there up to 9 standbys.. But it seems to be a problem.. And definitely, I cannot give my second standby other name than YELLOW as all my applications are strongly tied on db_name...
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Thanks as usual,
Maria

well, that's a good question! :)
because I don't have spare server for the standby. the question is not about: 'should I or should not put more than one standbys in one server' , but more about: 'is there any way to put two standbys with the identical db_names in one server'. I know that I probably sound unprofessional, but I just wanna know.. If the answer is 'no way', I will kill the first standby then and recreate the second one using DG with the correct name.
Thanks for writing to me,
M.

Need advice on another standby in another physical location

We have a 11.2.0.3 RAC Primary two nodes on one location and RAC Standby on another location.
Now we decided to add another standby in another location , standalone node.
How to configure that standby?
Lets say our Primary db is called PRDB, and then standby RAC db name is PRDB, db_unique_name is called PRDBS.
WE would like this new standby db on standalone server called db as PRDB, and db_unique_name is also PRDB.
How do we proceed from there if we would like to utilize dataguard broker?
Thank you in advance.

Now we decided to add another standby in another location , standalone node.
How to configure that standby?You can configure number of standby databases depending on how many log_archive_dest_n you have.
Lets say our Primary db is called PRDB, and then standby RAC db name is PRDB, db_unique_name is called PRDBS.
WE would like this new standby db on standalone server called db as PRDB, and db_unique_name is also PRDB.Even if you have 10 standby database, DB_NAME should be same even in primary & all standby databases
DB_UNIQUE_NAME should be different on each standby database, it's an unique where you can distinguish Each standby database.
See also:-
DB_UNIQUE_NAME specifies a globally unique name for the database. Databases with the same DB_NAME within the same DB_DOMAIN (for example, copies of a database created for reporting or a physical standby) must have a unique DB_UNIQUE_NAME. Every database's DB_UNIQUE_NAME must be unique within the enterprise.
Source:- http://docs.oracle.com/cd/B28359_01/server.111/b28320/initparams065.htm
How do we proceed from there if we would like to utilize dataguard broker? Once you build standby database,
1) enable broker
2) add database.
Edited by: CKPT on Jul 11, 2012 8:52 PM

Standby database off of another standby

Using the 10g R1 Data Guard - is it possible/sensible to create a standby database (call it stdby2) from another standby (say stdby1)? Perhaps it doesn't make sense since there are no added benefits - can anyone please comment on this?
Thanks,
Sophie

It is possible to replicate to a second standby from another, it is called Cascaded Destinations and is covered in the data guard documentation. Indeed each standby can support up to 9 other cascaded destinations.
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Hope this helps

Is that possible to convert logical standby to physical standby ?

Hi guys,
My steps for testing as below:
1.create a primary database
2.duplicate a physical standby database;
3.turn on flashback on both databases.
4.record SCN xxx on physical standby database.
5.convert physical standby to logical standby (using keep identity statement)
6.flashback to logical standby to xxx
7.convert logical standby to physical standby
8.using real time apply
I got errors:
Fast Parallel Media Recovery enabled
Managed Standby Recovery starting Real Time Apply
MRP0: Background Media Recovery waiting for new incarnation during transient logical upgrade procedure
Errors in file /home/ora/app/oracle/diag/rdbms/ora11gr1dg/ora11gr1dg/trace/ora11gr1dg_mrp0_10120.trc:
ORA-19906: recovery target incarnation changed during recovery
Managed Standby Recovery not using Real Time Apply
Errors in file /home/ora/app/oracle/diag/rdbms/ora11gr1dg/ora11gr1dg/trace/ora11gr1dg_mrp0_10120.trc:
ORA-19906: recovery target incarnation changed during recovery
Errors appears every 10 seconds. Seems MPR0 is waiting for new incarnation for a long time. So am I.
Standby database incarnation:
List of Database Incarnations
DB Key Inc Key DB Name DB ID STATUS Reset SCN Reset Time
1 1 ORA11GR1 3853851354 CURRENT 1 08/09/2013 01:02:18
2 2 ORA11GR1 3853851354 ORPHAN 2127877 08/28/2013 19:22:01 BGV

Hello;
Because of limitations for specific data types and objects with a logical database I going to say no.
Best Regards
mseberg

What is the fundamental diff between physical standby and logical standby ?

What is the fundamental difference between logical standby and physical standby ?
What if I create a physical standby , now I would like to ask that is it possible to open it on read only mode ? If not , then why not ?
hare krishna
Alok

Nothing will explain you better Oracle than Oracle documentation :<br>
Standby Database Types<br>
<br>
Nicolas.

Logical Standby to Physical Standby

Hi Group,
Please clarify. Is it possible to return from a Logical Standby to Physical standby without copying the datafiles from Primary enviroment again?.
If yes, how?
Thanks a lot.
Oracle 10.2.0.4
SO: AIX 6.1
We also have all archives generated by primary database on disks

user12215372 wrote:
Hi Group,
Please clarify. Is it possible to return from a Logical Standby to Physical standby without copying the datafiles from Primary enviroment again?.
If yes, how?
Thanks a lot.
Oracle 10.2.0.4
SO: AIX 6.1
We also have all archives generated by primary database on disksAFAIK, it is not possible, you have to create a fresh physical standby database.

Physical Standby from Logical Standby

Is it possible this scenario?
Create a physical standby from logical standby and the physical receive archive from logical.
I mean,
Primary (10g production) -> Logical (11gr2 new server 1) -> (Physical 11gr2 new server 2)
The goal of this scenario is a migration with a short downtime.
O.S. aix 6.1
11.2.0.2

Is it possible this scenario?YES

Use standby-database as standby-database after creating primary database

First I will tell what we have and what I did.
We have a standby database on server B that was not started. We did a cold copy to server A and opened the database on server A as primary database. Now we wonder if we can use the standby database on server B to apply archives without creating a new copy to server B. The standby database on server B is waiting for sequence 2900, while the database on server A started with a new sequence.
Is it possible somehow to start the recovery again on the standby databsae on server B without creating a new copy?
Forgot to mention: db-version is 9.2.0.7.0, OS is SunOS 5.10

Writing seperate code is not needed, Oracle will copy the files if the log_archive_dest is set to the right value.
However, it is solved!
What I did:
- create standby controlfile on the primary
- copy standby controlfile to standby database
- on standby: startup nomount / alter database mount standby database
- on primary: set log_archive_dest_2 to trigger the copying of archivelogs to the standby
Right now the standby database is recovering.

Cascading physical standby from another physical standby for primary rac

my supplier told me that is possible mount a cascade physical standby from a physical standby for my rac installation.
but according the note "409013.1" seems not:
"Cascading a logical or physical standby database from a physical standby database is supported as long as the primary database is not a RAC database and is not part of a Data Guard Broker configuration - the support status of this configuration is unchanged from previous documentation."
before was possible? do you know why not now?
has anyone mounted? can I allow my provider to mount?
oracle version: 10.2.0.2.0

Is it possible this scenario?YES

Creating standby or logical standby database manually?

Hi,
I have to create 4 logical standby databases on a Linux Red Hat 64-bits server.
The primary databases reside on another Linux Red Hat 64-bits server.
The oracle database version is 10.2.0.3.
The question is as follows:
Should I create the logical standby databases manually or should I do it with the Oracle EM Grid Control?
I have read that the creation of standby databases with the Grid Control is very straightforward, but I really want to read of some of your experiences.
I have read that there are some problems in Grid Control with the test of Failover and Switchover.
Please advice.

Hi,
It all depends.
I assume you don't backup your database to tape using RMAN.
Do you backup your database to disk using RMAN?
You would need to set up NFS links from your standby server to the primary server.
For this purpose, in 9i, I made sure my disk backup ended up in <directory>/backup/<nodename>, so I could easily set up a NFS link.
If you do it manually, you need to have made a full database RMAN backup first.
Probably Grid Control is taking care of this for you.
I have done it once using database control in 10g. It is really simple, and you just have to click a few buttons and sit back.
Doing it manually is slightly more work: you need to make sure parameters are correct and you need to write a (generic) script of less than 10 lines.
You probably do have more control over it, though RMAN's duplicate database command is robust and can be restarted easily.
I can't answer your last remark.
Hth
Sybrand Bakker
Senior Oracle DBA

Physical standby and logical standby

Hi,
Why we mention standby_archive_dest and log_archive_Dest in standby init.ora.
bcz there is no activity at physical standby.so why we set two parameters?
what is difference between physical stand by and logical standby?

Hi,
A logical standby database contains the same logical information as the production database, although the physical organization and structure of the data can be different. The SQL apply technology keeps the logical standby database synchronized with the primary database by transforming redo data received from the primary database into SQL statements and then executing the SQL statements on the standby database. This makes it possible for the logical standby database to be open read-write and accessed for queries and reporting purposes at the same time the SQL is being applied to it.
Logical vs Physical Standby database
http://www.orafaq.com/node/957
Regards,
Tom
Edited by: Soli on 19.8.2009 13:48

Stantard Edition-standby database-switchover standby (primary) to primary

i hace two server standar editon , i configure manual standby database fisical .
Database size = 700GB
DBP : database primary
DBS : database standby
All ok, my configuration is ok, everything works fine, but one day I had to do n switchover by hardware problems
note : manual standby database fisica
DBP to standby - do nothing, receive nothing or apply anything
DBS to Primary - receives user requests read and write
all ok.
the downtime of DBP = 7 horas:
archivelogs generated of DBS = 198 MB.
i want this:
DBP ( standby - nothing) to primary
DBS ( primary ok ) to standby
but
but I have to do, I have to do all settings again and for me no problem.
the point is how i can DBP = DBS ( data update) .
my problema is database size 700GB , is very big for me for hotbackup or backup rman
would have to generate a backup and apply DBS to DBP.
I can apply only archivi logs generated in DBS (198 mb), and as I do because eh searched and can not find documentation.
please help.
note : my english is very bad!!! =P

hmmmm, it is veyi interesting,
TNS-03505: Failed to resolve name
Cause: The service name you provided could not be found in TNSNAMES.ORA, an Oracle Names server, or a native naming service.
Action: Verify that you entered the service name correctly. You may need to ensure that the name was entered correctly into the network configuration.
Please check this link:
Oracle in World: Troubleshoot ORA-12154 TNS-12154 TNS-03505: Failed to resolve name
Thank you.

Can read-only standby be cascaded from another DR physical standby

we are going to have one two-node RAC database in the primary site (site A), one Data Guard maintained standby database in the DR site (site B) and one ACTIVE Data Guard maintained read-only database for reporting (site C, on the same subnet as site B). My question is what is the best practice for the data guard configuration in terms of the redo log transportation, Is it possible to set up relay of redo log transport from one physical standby to another (database version 11gR2, data guard in Maximum Performance Mode):
1)     A->B->C (minimum overhead to primary site A, maximum delay to report site C)
2)     A->C->B (minimum overhead to primary site A, maximum delay to DR site C)
3)     A->B; A-C (maximum overhead to primary site A, minimum delay to site B and C)
Are all three configuration possible, which one would you recommend?
Any discussion document or white paper about the above configuration you can point to for me (I gather the scenario may be rare, but multiple physical standby instances set up are not uncommon, if to ignore active data guard part) ?
Edited by: user10786648 on 24/07/2012 17:40
Edited by: user10786648 on 24/07/2012 17:47
Edited by: user10786648 on 24/07/2012 23:36

Hello;
Welcome to the forum.
minimum overhead to primary site A, maximum delay to report site - ( I don't believe in emergency reports, Primary should rule. )
Will refer to these white papers :
Data Guard Redo Transport & Network Best Practices
http://www.oracle.com/technetwork/database/features/availability/maa-wp-10gr2-dataguardnetworkbestpr-134557.pdf
And
Rapid Oracle RAC Standby
http://www.oracle.com/technetwork/database/availability/maa-wp-11g-racone-standby-501088.pdf
And of General interest
Oracle Data Guard with Oracle Database 11g Release 2
http://www.oracle.com/technetwork/database/features/availability/twp-dataguard-11gr2-1-131981.pdf
Oracle Data Guard Technical White Papers
http://www.oracle.com/technetwork/database/features/availability/data-guard-technical-info-152834.html
http://grokbase.com/t/freelists.org/oracle-l/11c18th65t/active-dataguard-ndash-ndash-cascade-standby-or-not
Best Regards
mseberg
Edited by: mseberg on Jul 24, 2012 7:55 PM

Standby of another standby??

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