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

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.

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

I have one problem with Data Guard. My archive log files are not applied.

I have one problem with Data Guard. My archive log files are not applied. However I have received all archive log files to my physical Standby db
I have created a Physical Standby database on Oracle 10gR2 (Windows XP professional). Primary database is on another computer.
In Enterprise Manager on Primary database it looks ok. I get the following message Data Guard status Normal
But as I wrote above the archive log files are not applied
After I created the Physical Standby database, I have also done:
1. I connected to the Physical Standby database instance.
CONNECT SYS/SYS@luda AS SYSDBA
2. I started the Oracle instance at the Physical Standby database without mounting the database.
STARTUP NOMOUNT PFILE=C:\oracle\product\10.2.0\db_1\database\initluda.ora
3. I mounted the Physical Standby database:
ALTER DATABASE MOUNT STANDBY DATABASE
4. I started redo apply on Physical Standby database
alter database recover managed standby database disconnect from session
5. I switched the log files on Physical Standby database
alter system switch logfile
6. I verified the redo data was received and archived on Physical Standby database
select sequence#, first_time, next_time from v$archived_log order by sequence#
SEQUENCE# FIRST_TIME NEXT_TIME
3 2006-06-27 2006-06-27
4 2006-06-27 2006-06-27
5 2006-06-27 2006-06-27
6 2006-06-27 2006-06-27
7 2006-06-27 2006-06-27
8 2006-06-27 2006-06-27
7. I verified the archived redo log files were applied on Physical Standby database
select sequence#,applied from v$archived_log;
SEQUENCE# APP
4 NO
3 NO
5 NO
6 NO
7 NO
8 NO
8. on Physical Standby database
select * from v$archive_gap;
No rows
9. on Physical Standby database
SELECT MESSAGE FROM V$DATAGUARD_STATUS;
MESSAGE
ARC0: Archival started
ARC1: Archival started
ARC2: Archival started
ARC3: Archival started
ARC4: Archival started
ARC5: Archival started
ARC6: Archival started
ARC7: Archival started
ARC8: Archival started
ARC9: Archival started
ARCa: Archival started
ARCb: Archival started
ARCc: Archival started
ARCd: Archival started
ARCe: Archival started
ARCf: Archival started
ARCg: Archival started
ARCh: Archival started
ARCi: Archival started
ARCj: Archival started
ARCk: Archival started
ARCl: Archival started
ARCm: Archival started
ARCn: Archival started
ARCo: Archival started
ARCp: Archival started
ARCq: Archival started
ARCr: Archival started
ARCs: Archival started
ARCt: Archival started
ARC0: Becoming the 'no FAL' ARCH
ARC0: Becoming the 'no SRL' ARCH
ARC1: Becoming the heartbeat ARCH
Attempt to start background Managed Standby Recovery process
MRP0: Background Managed Standby Recovery process started
Managed Standby Recovery not using Real Time Apply
MRP0: Background Media Recovery terminated with error 1110
MRP0: Background Media Recovery process shutdown
Redo Shipping Client Connected as PUBLIC
-- Connected User is Valid
RFS[1]: Assigned to RFS process 2148
RFS[1]: Identified database type as 'physical standby'
Redo Shipping Client Connected as PUBLIC
-- Connected User is Valid
RFS[2]: Assigned to RFS process 2384
RFS[2]: Identified database type as 'physical standby'
Redo Shipping Client Connected as PUBLIC
-- Connected User is Valid
RFS[3]: Assigned to RFS process 3188
RFS[3]: Identified database type as 'physical standby'
Primary database is in MAXIMUM PERFORMANCE mode
Primary database is in MAXIMUM PERFORMANCE mode
RFS[3]: No standby redo logfiles created
Redo Shipping Client Connected as PUBLIC
-- Connected User is Valid
RFS[4]: Assigned to RFS process 3168
RFS[4]: Identified database type as 'physical standby'
RFS[4]: No standby redo logfiles created
Primary database is in MAXIMUM PERFORMANCE mode
RFS[3]: No standby redo logfiles created
10. on Physical Standby database
SELECT PROCESS, STATUS, THREAD#, SEQUENCE#, BLOCK#, BLOCKS FROM V$MANAGED_STANDBY;
PROCESS STATUS THREAD# SEQUENCE# BLOCK# BLOCKS
ARCH CONNECTED 0 0 0 0
ARCH CONNECTED 0 0 0 0
ARCH CONNECTED 0 0 0 0
ARCH CONNECTED 0 0 0 0
ARCH CONNECTED 0 0 0 0
ARCH CONNECTED 0 0 0 0
ARCH CONNECTED 0 0 0 0
ARCH CONNECTED 0 0 0 0
ARCH CONNECTED 0 0 0 0
ARCH CONNECTED 0 0 0 0
ARCH CONNECTED 0 0 0 0
ARCH CONNECTED 0 0 0 0
ARCH CONNECTED 0 0 0 0
ARCH CONNECTED 0 0 0 0
ARCH CONNECTED 0 0 0 0
ARCH CONNECTED 0 0 0 0
ARCH CONNECTED 0 0 0 0
ARCH CONNECTED 0 0 0 0
ARCH CONNECTED 0 0 0 0
ARCH CONNECTED 0 0 0 0
ARCH CONNECTED 0 0 0 0
ARCH CONNECTED 0 0 0 0
ARCH CONNECTED 0 0 0 0
ARCH CONNECTED 0 0 0 0
ARCH CONNECTED 0 0 0 0
ARCH CONNECTED 0 0 0 0
ARCH CONNECTED 0 0 0 0
ARCH CONNECTED 0 0 0 0
ARCH CONNECTED 0 0 0 0
ARCH CONNECTED 0 0 0 0
RFS IDLE 0 0 0 0
RFS IDLE 0 0 0 0
RFS IDLE 1 9 13664 2
RFS IDLE 0 0 0 0
10) on Primary database:
select message from v$dataguard_status;
MESSAGE
ARC0: Archival started
ARC1: Archival started
ARC2: Archival started
ARC3: Archival started
ARC4: Archival started
ARC5: Archival started
ARC6: Archival started
ARC7: Archival started
ARC8: Archival started
ARC9: Archival started
ARCa: Archival started
ARCb: Archival started
ARCc: Archival started
ARCd: Archival started
ARCe: Archival started
ARCf: Archival started
ARCg: Archival started
ARCh: Archival started
ARCi: Archival started
ARCj: Archival started
ARCk: Archival started
ARCl: Archival started
ARCm: Archival started
ARCn: Archival started
ARCo: Archival started
ARCp: Archival started
ARCq: Archival started
ARCr: Archival started
ARCs: Archival started
ARCt: Archival started
ARCm: Becoming the 'no FAL' ARCH
ARCm: Becoming the 'no SRL' ARCH
ARCd: Becoming the heartbeat ARCH
Error 1034 received logging on to the standby
Error 1034 received logging on to the standby
LGWR: Error 1034 creating archivelog file 'luda'
LNS: Failed to archive log 3 thread 1 sequence 7 (1034)
FAL[server, ARCh]: Error 1034 creating remote archivelog file 'luda'
11)on primary db
select name,sequence#,applied from v$archived_log;
NAME SEQUENCE# APP
C:\ORACLE\PRODUCT\10.2.0\ORADATA\IRINA\ARC00003_0594204176.001 3 NO
C:\ORACLE\PRODUCT\10.2.0\ORADATA\IRINA\ARC00004_0594204176.001 4 NO
Luda 4 NO
Luda 3 NO
C:\ORACLE\PRODUCT\10.2.0\ORADATA\IRINA\ARC00005_0594204176.001 5 NO
Luda 5 NO
C:\ORACLE\PRODUCT\10.2.0\ORADATA\IRINA\ARC00006_0594204176.001 6 NO
Luda 6 NO
C:\ORACLE\PRODUCT\10.2.0\ORADATA\IRINA\ARC00007_0594204176.001 7 NO
Luda 7 NO
C:\ORACLE\PRODUCT\10.2.0\ORADATA\IRINA\ARC00008_0594204176.001 8 NO
Luda 8 NO
12) on standby db
select name,sequence#,applied from v$archived_log;
NAME SEQUENCE# APP
C:\ORACLE\PRODUCT\10.2.0\ORADATA\LUDA\ARC00004_0594204176.001 4 NO
C:\ORACLE\PRODUCT\10.2.0\ORADATA\LUDA\ARC00003_0594204176.001 3 NO
C:\ORACLE\PRODUCT\10.2.0\ORADATA\LUDA\ARC00005_0594204176.001 5 NO
C:\ORACLE\PRODUCT\10.2.0\ORADATA\LUDA\ARC00006_0594204176.001 6 NO
C:\ORACLE\PRODUCT\10.2.0\ORADATA\LUDA\ARC00007_0594204176.001 7 NO
C:\ORACLE\PRODUCT\10.2.0\ORADATA\LUDA\ARC00008_0594204176.001 8 NO
13) my init.ora files
On standby db
irina.__db_cache_size=79691776
irina.__java_pool_size=4194304
irina.__large_pool_size=4194304
irina.__shared_pool_size=75497472
irina.__streams_pool_size=0
*.audit_file_dest='C:\oracle\product\10.2.0\admin\luda\adump'
*.background_dump_dest='C:\oracle\product\10.2.0\admin\luda\bdump'
*.compatible='10.2.0.1.0'
*.control_files='C:\oracle\product\10.2.0\oradata\luda\luda.ctl'
*.core_dump_dest='C:\oracle\product\10.2.0\admin\luda\cdump'
*.db_block_size=8192
*.db_domain=''
*.db_file_multiblock_read_count=16
*.db_file_name_convert='luda','irina'
*.db_name='irina'
*.db_unique_name='luda'
*.db_recovery_file_dest='C:\oracle\product\10.2.0\flash_recovery_area'
*.db_recovery_file_dest_size=2147483648
*.dispatchers='(PROTOCOL=TCP) (SERVICE=irinaXDB)'
*.fal_client='luda'
*.fal_server='irina'
*.job_queue_processes=10
*.log_archive_config='DG_CONFIG=(irina,luda)'
*.log_archive_dest_1='LOCATION=C:/oracle/product/10.2.0/oradata/luda/ VALID_FOR=(ALL_LOGFILES, ALL_ROLES) DB_UNIQUE_NAME=luda'
*.log_archive_dest_2='SERVICE=irina LGWR ASYNC VALID_FOR=(ONLINE_LOGFILES, PRIMARY_ROLE) DB_UNIQUE_NAME=irina'
*.log_archive_dest_state_1='ENABLE'
*.log_archive_dest_state_2='ENABLE'
*.log_archive_max_processes=30
*.log_file_name_convert='C:/oracle/product/10.2.0/oradata/irina/','C:/oracle/product/10.2.0/oradata/luda/'
*.open_cursors=300
*.pga_aggregate_target=16777216
*.processes=150
*.remote_login_passwordfile='EXCLUSIVE'
*.sga_target=167772160
*.standby_file_management='AUTO'
*.undo_management='AUTO'
*.undo_tablespace='UNDOTBS1'
*.user_dump_dest='C:\oracle\product\10.2.0\admin\luda\udump'
On primary db
irina.__db_cache_size=79691776
irina.__java_pool_size=4194304
irina.__large_pool_size=4194304
irina.__shared_pool_size=75497472
irina.__streams_pool_size=0
*.audit_file_dest='C:\oracle\product\10.2.0/admin/irina/adump'
*.background_dump_dest='C:\oracle\product\10.2.0/admin/irina/bdump'
*.compatible='10.2.0.1.0'
*.control_files='C:\oracle\product\10.2.0\oradata\irina\control01.ctl','C:\oracle\product\10.2.0\oradata\irina\control02.ctl','C:\oracle\product\10.2.0\oradata\irina\control03.ctl'
*.core_dump_dest='C:\oracle\product\10.2.0/admin/irina/cdump'
*.db_block_size=8192
*.db_domain=''
*.db_file_multiblock_read_count=16
*.db_file_name_convert='luda','irina'
*.db_name='irina'
*.db_recovery_file_dest='C:\oracle\product\10.2.0/flash_recovery_area'
*.db_recovery_file_dest_size=2147483648
*.dispatchers='(PROTOCOL=TCP) (SERVICE=irinaXDB)'
*.fal_client='irina'
*.fal_server='luda'
*.job_queue_processes=10
*.log_archive_config='DG_CONFIG=(irina,luda)'
*.log_archive_dest_1='LOCATION=C:/oracle/product/10.2.0/oradata/irina/ VALID_FOR=(ALL_LOGFILES, ALL_ROLES) DB_UNIQUE_NAME=irina'
*.log_archive_dest_2='SERVICE=luda LGWR ASYNC VALID_FOR=(ONLINE_LOGFILES, PRIMARY_ROLE) DB_UNIQUE_NAME=luda'
*.log_archive_dest_state_1='ENABLE'
*.log_archive_dest_state_2='ENABLE'
*.log_archive_max_processes=30
*.log_file_name_convert='C:/oracle/product/10.2.0/oradata/luda/','C:/oracle/product/10.2.0/oradata/irina/'
*.open_cursors=300
*.pga_aggregate_target=16777216
*.processes=150
*.remote_login_passwordfile='EXCLUSIVE'
*.sga_target=167772160
*.standby_file_management='AUTO'
*.undo_management='AUTO'
*.undo_tablespace='UNDOTBS1'
*.user_dump_dest='C:\oracle\product\10.2.0/admin/irina/udump'
Please help me!!!!

Hi,
After several tries my redo logs are applied now. I think in my case it had to do with the tnsnames.ora. At this moment I have both database in both tnsnames.ora files using the SID and not the SERVICE_NAME.
Now I want to use DGMGRL. Adding a configuration and a stand-by database is working fine, but when I try to enable the configuration DGMGRL gives no feedback and it looks like it is hanging. The log, although says that it succeeded.
In another session 'show configuration' results in the following, confirming that the enable succeeded.
DGMGRL> show configuration
Configuration
Name: avhtest
Enabled: YES
Protection Mode: MaxPerformance
Fast-Start Failover: DISABLED
Databases:
avhtest - Primary database
avhtestls53 - Physical standby database
Current status for "avhtest":
Warning: ORA-16610: command 'ENABLE CONFIGURATION' in progress
It there anybody that experienced the same problem and/or knows the solution to this?
With kind regards,
Martin Schaap

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

Repository with Data Guard

Can i use a database with Data Guard for HA with "fast connect failover" for your EM repository database?

Yes, it is the preferred method. Take advantage of the DG ability to execute a trigger on switchover/failover to move the service used by the OMS from the primary to the standby.
Please check the chapter advance config

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

Problem with data guard Creating a Physical Standby Database turorial

There is a tutorial of Creating a data guard Physical Standby Database:
http://www.oracle.com/technology/obe/11gr1_db/ha/dataguard/physstby/physstdby.htm
I tried to install it on two servers. One for primary database second for physical standby.
I have error on C. Creating the standby database over the network, action #6:
"On the standby system, set the ORACLE_SID environment variable to your <physical standby SID> (i.e. orclsby1) and start the instance in NOMOUNT mode with the text initialization parameter file."
When I try to connect to idle instance there is an error pops up:
C:\>sqlplus / as sysdba
SQL*Plus: Release 11.1.0.7.0 - Production on Thu May 21 16:28:10 2009
Copyright (c) 1982, 2008, Oracle. All rights reserved.
ERROR:
ORA-12560: TNS:protocol adapter error
I'v checked listener and it is runned. There is no service for database because there is no database yet.
The question is did some one installed data guard configuration using this tutorial? Is there any errors in it? What should I do to finish this installation?

On Windhose for every instance a service must have been created using the oradim command.
Oracle tutorials are usually Unix-centric, as Windhose is an odd man out, so they don't discuss that bit.
'Kindly do the needful' and create the service prior to starting the instance in nomount mode
Hint: oradim is documented and has a help=y clause.
IIRC there is an option in database control (in the maintenance part) which automates everything.
Sybrand Bakker
Senior Oracle DBA
Experts: those who do read documentation

Upgrade 11.1 to 11.2 with Data Guard In Place

I am planing on upgrading my primary and standby servers to 11gR2 and was wondering what are the best steps. I do not plan on doing a switchover during the process because down time is only about an hour and we can afford it.
Here is what I plan on doing:
1. On Primary - ALTER SYSTEM SET LOG_ARCHIVE_DEST_STATE_2=DEFER SCOPE=BOTH;
2. On Standby - ALTER DATABASE STOP LOGICAL STANDBY APPLY;
3. Upgrade the standby database then the primary database
4. On Standby - ALTER DATABASE START LOGICAL STANDBY APPLY IMMEDIATE;
5. On Primary - ALTER SYSTEM SET LOG_ARCHIVE_DEST_STATE_2=ENABLE;
Let me know if these steps don't sound right. But my question is should I disable archive during the upgrade processes? if I do could this mess up sending archive logs over to primary because there will be missing sequences numbers?
And my second question is do I need to do anything to the Data Guard broker after the upgrade. I currently use Enterprise Manager to manager the setup.
Thanks in advance for any responses. Oh and I am running on Server 2003 if it matters.
Jeff

Is this a physical or logical standby ? If logical, the steps in MOS Doc 437276.1 (Upgrading Oracle Database with a Logical Standby Database In Place) may be of ehlp
HTH
Srini

HELP ME. Client Configuration with Data Guard

Hi,
I made a DATA GUARD configuration with Oracle 10g r2 and GRID CONTROL 10.2.0.3.
I've 1DB OMS, 1 DB primary, 1 DB standby phisical, 1 DB observer, fast-startfailover on.
Everything works fine: failover, switchover.
My question is: how the client knows what DB is open when the primary DB fail? How to configure the client can know what the DB is active?
thanks.

Configure the client failover in the tnsnames.ora. The How To will be in the Data Gaurd configuration guide you are using.

EM Job scheduling with Data Guard Database

Hi there,
I have an "Issue" on efficient scheduling Enterprise Manager (12.1.0.3) Jobs again databases which are protected with Oracle Data Guard.
What I want:
A Job should be run against the database, which has the "Primary Database Role" from Data Guard point of view.
When I'm scheduling the job with the Database System as job target, where the Primary and Standby Databases are exisitng in, the Job is executed against all databases.
I can put check-step as first step in the job to check the role by sql, but when I let 2 of 3 job executions ( 2 standby 1, primary ) fail, I will have o mange these failed jobs all time.
Creating an dynamic group also isn't helping, as the property of database role can't be used for defining the group membership.
I have taken a look at emcli but also there I dont find a possibility tho check for database role.
Any one a idea on this topic?
br
Jörg

These notes just show duplicating dbs without datagurd, i am looking for Creating a Data Guard DB with RMAN in 10 &11g.

Using Flashback with Data Guard (Physical)

We are running Oracle 11g R2 on RHEL 5.5 with a simple Physical and Standby Data Guard configuration.
When you flashback database the Primary database does the Standby also perform aflashback database?

Hi damorgan,
Sorry to reopen this thread but can you please point to the documentation your refer to?
I went through this scenario on my 11R1 data guard setup and had different outcome.
insert into tabb values (1,'aedfgadg');
insert into tabb values (2,'adfkafgafdadf');
commit;
create restore point restore_me;
insert into tabb values (3,'sabjadfjdfjasdvgjasdfav');
insert into tabb values (4,'asd,fbadmfbadbfadbfafa');
insert into tabb values (5,'dddddddddddddddddddd');
commit;Then I flashback to restore_me and after open reset logs I query the database. Only first two rows are there. Also media recovery is broken.
I open readonly standby and query the table. All five rows are there. Obviously the flashback has not affected standby.
I logged a call with Oracle and they advised that I have to manually flashback standby database to that point in time. same applies to 11R2.
Thanks,
Ali

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

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

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