Protection Modes and Fast-Start Failover

Oracle Maximum Availability Architecture allows you to set fast-start failover (FSF)to automatically failover to the standby in the event of losing the primary database.
One condition of FSF is that it will only initiate if there is a guarantee of no data loss. This is where i start getting confused. Maximum Availability mode allows for data loss as the primary will still process transactions if the connection to the standby is lost. This means then in the event of the standby being out of sync with the primary database (i.e. network glitches) and then losing the primary database to hardware issues for example. FSF will not be able to initiate as data will be lossed and a complete loss of service will happen!
Can FSF be used in Maximum Protection mode as this will always mean FSF will be able to occur? Also what is the overhead towards the databases with regards to running them in this mode?
Thanks,
Chris

Hi,
Can FSF be used in Maximum Protection mode as this will always mean FSF will be able to occur? Yes, Maximum Protection Mode can be used with Fast-Start Failover, please review the next link.
http://download.oracle.com/docs/cd/B19306_01/server.102/b14230/cli.htm#BABEIIHD
Also what is the overhead towards the databases with regards to running them in this mode?
Yes, the overhead is on major scale that other modes.
Regards.

Similar Messages

Data Guard Broker: errors ORA-16816 and ORA-16817 with Fast Start Failover

Hi,
my environment is:
OS: Windows XP Professional Edition SP2
DB: Oracle EE 10.2.0.3
Primary db: orcl
Standby db: stby
both databases are running on the same server.
I have configured Data Guard as described in the DG Administration Guide.
In the Data Guard Broker I switch to 'stby' succesfully and 'stby' is the primary db and 'orcl' is the standby db.
I switched back to 'orcl' as primary db and I get some errors:
DGMGRL> show database 'orcl' statusreport;
STATUS REPORT
INSTANCE_NAME SEVERITY ERROR_TEXT
* WARNING ORA-16817: configuration for Fast Start of Failover is not synchronized.
DGMGRL> show database 'stby' statusreport;
STATUS REPORT
INSTANCE_NAME SEVERITY ERROR_TEXT
* ERROR ORA-16816: wrong databaserole
* WARNING ORA-16817: configuration for Fast Start of Failover is not synchronized.
DGMGRL> show configuration;
Configuration
Name: DG1
Enabled: YES
Protection Mode: MaxAvailability
Fast-Start Failover: ENABLED
Databases:
orcl - Physical standby database
- Fast-Start Failover target
stby - Primary database
Current status for DG1:
Warning: ORA-16607: one or more databases failed.
I have searched for solutions on Metalink and google, but with no success.
Has anyone got this kind of problem?
Any suggestions on how to resolve it?
Thanks

Hi DigerDBA
I did your advice , the error disappear, and thanks for your advice , but do I need to keep standby_file_management='AUTO' or 'MANUAL' in primary and standby init files?
Am asking this because when I use the observer the failover failed and I get the following error
SQL Execution error=604, sql=[ALTER DATABASE COMMIT TO SWITCHOVER TO PRIMARY WAIT WITH SESSION SHUTDOWN]. See error stack below.
ORA-00604: error occurred at recursive SQL level 1
ORA-01275: Operation ADD LOGFILE is not allowed if standby file management is automatic.
Complete Failover operation failed in the step when attempting to convert the database to be the new primary.
Database Resource SetState Error (16771)
01/07/2014 09:14:43
Command FAILOVER TO epprod2 completed with error ORA-16771
if possible can you advice me please?

Can fast start failover be achieved in maximum performance mode

In a physical standby I would like to know if it is possible to configure High Availability in async mode to achieve fast-start failover? If so, please briefly describe how. Thanks

I've always said, size doesn't matter to Data Guard except when you are creating a standby database. After that it is the amount of Redo that is generated by the Primary database. A failover is a failover, for a 10GB database or for a 60TB database. The scary part is having to get the old Primary back up as a standby as quickly as possible.
Of course if the original Primary is completely toast then you have to recreate it with a new backup of the new primary or use a backup of the original Primary that happens to be on the Primary system and restore it as a standby and let Data Guard catch it up with the current state of affairs.
But, if the original Primary is still intact then you can use flashback database to reinstate it as a physical standby with little effort and no major backup restores. And of course, that is one of the requirements of Fast-Start Failover (FSFO). To enable it you have to have flashback database enabled on both the Primary and the FSFO target standby. Since enabling FB Database requires the database to be at the mount state I would suggest you enable it right after the upgrade to 11g.
When FSFO triggers a failover after a failure of the Primary, the Observer will automatically re-instantiate the failed Primary as a standby when it is started again and then it will be resynchronized with the new Primary automatically by Data Guard as normal.
The only difference between Maximum Availability FSFO and Maximum Performance FSFO is that you have to decide how much data you are will to lose when a failover occurs and tell the Broker by configuring the FastStartFailoverLagLimit property (see section 9.2.12 of the Broker manual).
You also want to be sure to place the Observer on a system where it is not affected by the Primary or Standby server going down or a network break between the Primary and the Standby. And if you can, use Grid Control. When you enable FSFO in Grid Control (on the Data Guard home page) you can specify 2 systems where the Observer can live. If it goes down on the original system an atempt will be made to restart it there. If that system if no longer available then Grid Control will attempt to start a new Observer on the 2nd system.
I would highly recommend you read the section [5.5 Fast-Start Failover|http://download.oracle.com/docs/cd/B28359_01/server.111/b28295/sofo.htm#i1027843] for lots of good information. And of course, the [Data Guard 11g Handbook|http://www.amazon.com/Oracle-Guard-Handbook-Osborne-ORACLE/dp/0071621113] (sorry, still plugging the book :^)
Larry

Fast Start Failover has broken my Logical Standby and Flashback has not helped

I have a primary ( PRIMARYP ), a physical standby ( STANDBYP ) and a logical standby ( STANDBYL ).
I configured Fast Start Failover ( with STANDBYP as the target ) and started an Observer. I did a shutdown abort on my primary and the Fast Start Failover did make STANDBYP the primary. I was able to reinstate PRIMARYP as a physical standby.
However when I checked my broker config it gave for STANDBYL
ORA-16795: the standby database needs to be recreated
Strange I though, since I would have expected STANDBYL to survive ok given that the new primary, STANDBYP was a physical standby of PRIMARYP.
Not to worry I thought, I simply will flashback STANDBYL to the beginning of the day and SQL APPLY will reapply all the redo.
This is where the problem begins
I mount STANDBYL
RMAN> connect target /
connected to target database: STANDBYL (DBID=440422466, not open)
RMAN> flashback database to time "TO_DATE('05/12/13 09:30:00','DD-MM-YY HH24:MI:SS')";
Starting flashback at 05-DEC-13
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=11 device type=DISK
starting media recovery
archived log for thread 1 with sequence 24 is already on disk as file /home/app/oracle/fast_recovery_area/STANDBYL/archivelog/2013_12_04/o1_mf_1_24_99yqwog0_.arc
archived log for thread 1 with sequence 25 is already on disk as file /home/app/oracle/fast_recovery_area/STANDBYL/archivelog/2013_12_05/o1_mf_1_25_9b0mlyvr_.arc
media recovery complete, elapsed time: 00:00:04
Finished flashback at 05-DEC-13
RMAN> quit
Recovery Manager complete.
oraclel[STANDBYL]>dgmgrl
DGMGRL for Linux: Version 11.2.0.3.0 - Production
Copyright (c) 2000, 2009, Oracle. All rights reserved.
Welcome to DGMGRL, type "help" for information.
DGMGRL> connect sys/manager
Connected.
DGMGRL> shutdown;
ORA-01109: database not open
Database dismounted.
ORACLE instance shut down.
DGMGRL>
DGMGRL>
DGMGRL> startup;
ORACLE instance started.
Database mounted.
ORA-01589: must use RESETLOGS or NORESETLOGS option for database open
ORA-01589 - that a nasty surprise ! I didn't think I would need to do anything with the log sequences after a flashback
Any ideas of what is going on ?
thanks,
Jim

Hello;
This pdf might meet your needs :
http://blogs.oracle.com/AlejandroVargas/resource/DATAGUARD-FSFO-IMPLEMENTATION.pdf
Additional info :
http://oracle-tech.blogspot.com/2008/08/fast-start-failover-it-is-reliable.html
http://jakub.wartak.pl/blog/?p=80
http://www.databasejournal.com/features/oracle/article.php/3849106/Fast-Start-Failover-in-Oracle-11g-Data-Guard.htm
Best Regards
mseberg

Warning: ORA-16829: fast-start failover configuration is lagging

Hi
I got waring for fast_start failover configuration
DGMGRL> show configuration
Configuration - activefailover_migdb
Protection Mode: MaxPerformance
Databases:
migdb - Primary database
Warning: ORA-16829: fast-start failover configuration is lagging
migdbdr - (*) Physical standby database
Warning: ORA-16829: fast-start failover configuration is lagging
Fast-Start Failover: ENABLED
Configuration Status:
WARNING
anybody please suggest solution for the same

Dear shd,
Please check the following link;
http://download.oracle.com/docs/cd/B28359_01/appdev.111/b28419/d_dg.htm
*ORA-16829: lagging Fast-Start Failover configuration*
+DBMS_DG.INITIATE_FS_FAILOVER was invoked in a maximum performance fast-start failover configuration when the configuration was not in the user-specified redo lag limit.+
Oracle Error :: ORA-16829
fast-start failover configuration is lagging
Cause
The fast-start failover target standby database was not within the lag limit specified by the FastStartFailoverLagLimit configuration property. As a result, a fast-start failover could not happen in the event of a primary database failure.
Action
Ensure that the fast-start failover target standby database is running and applying redo data and that the primary database is successfully trasmitting redo data. If this condition persists consider raising the value of the FastStartFailoverLagLimit configuration property.
Ogan

ORA-16820: fast-start failover observer is no longer observing this databa

Wem have primary and physical standby of Oracle 11.2 on linux 2.6.18-92.el5. For a reason of hardware resources, we want to run the Observer on the standby machine. Here I have several questions:
1) Is it supported to run Observer on the standby?
2) Does fast-start failover means automatical detecting down of primary and switch over the role automatically? WE do not want automatical switch over.
3) Started Observer on the standby and run show configuration, get errorDGMGRL> show configuration;
Configuration - antony
Protection Mode: MaxAvailability
Databases:
    rdev2 - Primary database
    sdev2 - (*) Physical standby database
      Error: ORA-16820: fast-start failover observer is no longer observing this database
Fast-Start Failover: ENABLED
Configuration Status:
ERROR Is the error caused by sunning Observer on standby, or other things?
Thanks.

Answering all your questions
Does fast-start failover means automatical detecting down of primary and switch over the role automatically? WE do not want automatical switch over.
Fast-Start Failover is an Oracle Data Guard 10g Release 2 feature that automatically, quickly, and reliably fails over to a designated, synchronized standby database in the event of loss of the production database, without requiring manual intervention to execute the failover.
In addition, following a fast-start failover, the original production database is automatically reconfigured as a new standby database upon reconnection to the configuration. This enables Data Guard to restore disaster protection in the configuration quickly and easily, returning the database to a protected state as soon as possible.
Is it supported to run Observer on the standby?
There are three essential participants in a Fast-Start Failover configuration:
• The production database
• A target standby database
• The Fast-Start Failover Observer
The target standby database will become the new production database following a fast-start failover (note: There can be multiple standby databases in a Data Guard configuration, but only one can be designated as the fast-start failover target. A manual failover would be required in order to execute a failover to any of the additional standby databases within the configuration).
The Observer is a separate process incorporated into the DGMGRL client that continuously monitors the production database and the target standby database for possible failure conditions.
The rule is that out of these three participants, (production database, standby database & observer) whichever two can communicate with each other will determine the outcome of fast-start failover
Hope the above explaination answers your question.

Fast-Start Failover - Without Observer

Hello Experts,
I have a 3 node RCA with a 3node standby. Manual complete failover and switchover work correctly. I would like to enablr fast-start failover when nobody is around.
I know that according to the documentation, I would need a 3rd server to act like the observer. But I 've run out of servers.
Could someone provide clues or ideas how I could set this up. Do I indeed need an observer, or is it really just for additional fault tolerance?
Sincerely
Jan S.

There's no shortage of short notes on this :
http://jakub.wartak.pl/blog/?p=80
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/
http://www.oracle.com/technetwork/articles/smiley-fsfo-084973.html
No idea how you would do it without Observer, its just a failover then.
Cooper

Protected Mode and incompatable system configurations

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Dateguard Protection Mode and log transfer doubt

Friends,
DB: 11gR2 (11.2.0.3) 64 bit
OS: OEL 5.5 64 bit
iam new to dataguard..
i just finished the setup of primary db and physical standby in my notebook.
the protection mode is the default one...that is...maximum performance. (primary)
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thanks

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http://docs.oracle.com/cd/B28359_01/server.111/b28294/protection.htm#
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While shutting do this:
Check whether primary and standby database are in SYNC and then Cancel the recovery process
Shut down the primary database and then shut down the standby database And if you are using ASM then you have to shutdown that also.
Stop all listeners and cluster services. Perform this step on all nodes in an Oracle Real Application Clusters (Oracle RAC) environment.
While starting do this:
Start the cluster services and listener
Start the ASM and then database
Start the recovery process on standby database.

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If I use print to Acrobat printer, I get an authorization error.
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All software is fully updated.
Acrobat works perfectly except for this very useful function.
I tried e-mailing support but had no reply (makes you wonder why people pirate with support this good!!!)
Any help would be much appreciated.

As if by magic
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Hi,
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Thanks,
Yoav

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Yoav

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Hinted streaming, fast start and fast start compressed header

Hi,
I am trying to export a movie trailer from FCP through Compressor for use on a website hosted by Wordpress. I am using h.264 and am trying to decide whether it is optimal to use hinted streaming, fast start or fast start compressed header. I found this discussion stream:
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Thanks,
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Export your movie.
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Work protect mode and wedynpro ABAP

Hi,
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Protection Modes and Fast-Start Failover

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