Standby protection mode

I wish to make parallel Standby Database. The first in AVAILABILITY MODE, the second in PERFORMANCE MODE. Whether It is possible to use it simultaneously? If yes how to specify for everyone Standby Database own MODE?
In the documentation the example is resulted.
Primary protection mode
Primary DB Standby DB1 Standby DB2
Maximum availability Not applicable Not applicable
Standby protection mode
Primary DB Standby DB1 Standby DB2
Not applicable Maximum availability Maximum performance
What is Standby protection mode?

The table look under the reference:
http://www.sql.ru/forum/actualthread.aspx?tid=482693&pg=-1
Documentation
http://www.filibeto.org/sun/lib/nonsun/oracle/10.2.0.1.0/B19306_01/server.102/b14239/scenarios.htm#sthref1552
Further the following text is resulted:
Note:
The New York city database is operating in maximum performance mode because sending redo data synchronously from HQ to NYC might impact the primary database performance during peak workload periods. However, the New York City standby database is still considered a viable candidate for failovers because it uses a standby redo log.

Similar Messages

Change standby protection mode

hello
i have setup data guard using oracle 10g on windowx xp,
when i change the protection mode to maximum availability it works fine but when i change to maximum protection the database shuts down ..
i tried again also it shuts down i reverted to maximum availability it works ...plz help
another question, can the primary database and the standby database have the same names ?
many thanks

Hi,
Is data actually being applied on the standby database? In maximum protection the primary will only commit once the redo data is available on a standby db. If the standby is unreachable the primary would essentially stop processing.
On the standby, try querying v$archived_log to see if the logs are actually being received. Also check the alert log on the primary to see if there are any errors with the archiving process.

Physical Standby Database (Protection Mode)?!!

Hi,
I have configured a physical standby database to use Real-time Apply, but i noticed that the protection mode of the database has been changed from "Maximum Performance" to ''Maximum Availability"..
log_archive_dest_3='service=phystby OPTIONAL LGWR SYNC AFFIRM reopen=120 valid_for=(online_logfiles,primary_role) db_unique_name=phystby'
Any body to explaine??
Regards,

LGWR SYNC AFFIRM
These are the options are used in maximum protection mode ,in which oracle will write the information in both the server(primary and standby) and this write occurs at same time.
oracle write the information in online redo logfile of both the server simultaneously.
and this option ensure no data loss will occurs if primary will fail.
SYNC related with Network transmission mode.
AFFIRM related with disk write option.
LGWR describe Redo archival process.
Thanks
Kuljeet

Query regarding upgrading protection mode in a data guard

I am using Oracle 10g in Linux platform
Consider that I have a logical standby and a physical standby and now I want to upgrade the protection mode of physical standby but want the logical standby to retain the protection mode .
According to the Oracle documentation they have specified that the following statement has to be issued from primary to upgrade protection mode of a standby
SQL > Alter database set standby database to maximum availability;So to which standby this statement will refer to, whether logical standby or physical standby?

Hi,
What you want to do is very possible. Please not however the protection mode DOES NOT apply to a standby when you say a database has a certain protection mode, it applies to the primary.
First to be in maximum availability you have to issue the command you state, and that applies to the primary, it is now in maximum availability but to get there it must have ONE standby that uses LGWR SYNC as the transport mechanism with AFFIRM.
You can also have other standby's running from this primary, that DO NOT have to use LGWR SYNC, but can use the other available tranport mechanisms.
This is explained here:
http://download.oracle.com/docs/cd/B28359_01/server.111/b28294/protection.htm#CHDEDGIF
cheers,
jason.
http://jarneil.wordpress.com

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.

Data Protection Mode

Hello,
1) In order to set Data protection mode, do I need to set anything on standby?
2) My database is in Maximum Performance mode. I set up following entry on init.ora:
LOG_ARCHIVE_DEST_2=’service=standby LGWR ASYNC’.
I want to change data guard protection mode from Max Performance to Max Protection. For that i have changed from the "ASYNC" attribute to "SYNC" attribute of the LOG_ARCHIVE_DEST_n initialization parameter like:
LOG_ARCHIVE_DEST_2=’service=standby LGWR SYNC’.
But I have not changed the protection mode on the primary database using “alter database set standby database to maximize protection”.
Does it continue as Max Performance mode or will it throw any error?

1) In order to set Data protection mode, do I need to set anything on standby? You have to take care only in primary LOG_ARCHIVE_DEST_n parameter, If you changed protection mode of course it will be taken care.
But dont forget to check on standby if you have configured anything on LOG_ARCHIVE_DEST_n parameter[if you perform switchover in future], usually it will left blank.
2) My database is in Maximum Performance mode. I set up following entry on init.ora:
LOG_ARCHIVE_DEST_2=’service=standby LGWR ASYNC’.
I want to change data guard protection mode from Max Performance to Max Protection. For that i have changed from the "ASYNC" attribute to "SYNC" attribute of the LOG_ARCHIVE_DEST_n initialization parameter like:
LOG_ARCHIVE_DEST_2=’service=standby LGWR SYNC’.
But I have not changed the protection mode on the primary database using “alter database set standby database to maximize protection”.
Does it continue as Max Performance mode or will it throw any error?Similar discussion, You can check this link what happens if you set LGWR & SYNC in maximum performance mode :)
using LGWR SYNC with Max Performance

Data Guard Protection mode

How to set Data Protection Mode of a Primary Database? Setting only LOG_ARCHIVE_DEST_2 parameter will do?

Hello;
Welcome to the forum.
No. LOG_ARCHIVE_DEST_2 is almost always used to the the location of a standby database.
By default Data Guard will be in MAXIMUM PERFORMANCE mode.
Here's a short note I put together on this :
http://www.visi.com/~mseberg/protection_mode.html
Please consider closing your question if its answered.
Best Regards
mseberg

Question about protection mode in Stdby env.

Hi,
In a standby environment, can we have primary database working in two protection mode simultaneously.
e.g. There are 2 standby databases for a primary database. One is situated in another city (Stdby_A) connected via a slow link and another is in the same data center connected via 1Gbps link (Stdby_B).
Can we have primary database working in Maximum Performance mode for 'Stdby_A; and in maximum protection mode for 'Stdby_B'.
Thanks
Amit.

thanks,
what could be the best possible solution in above scenario.
Regards,
Amit

Upgrading protection mode

I've never used any Data Guard protection mode except Maximum Performance before so please forgive me if my questions seem ignorant.
I have a primary DB with 2 standbys both currently operating in maximum performance mode. The primary is a 2 node RAC cluster. Both standbys are single instance. None of the databases in the configuration use standby logs (yet). I am currently using ARCH to ship the logs to both standbys. All databases are running version 11.2. I am not using Data Guard broker.
I am considering upgrading just standby # 2 to maximum availability protection mode, but I'm not sure if it's really what I want or not. Perhaps someone here with a better understanding can confirm for me whether its the best choice.
My goal is to achieve the maximum data protection possible with no performance impact whatsoever on the primary database.
If I understand maximum availability correctly (and I am not certain I do), a commit issued on the primary will not complete until the maximum availability standby has acknowledged receipt of the redo data. If the link between the two goes down, that could introduce a significant delay in the commit. Is that correct? In my situation any performance impact on the primary DB is unacceptable.
Perhaps what I want is maximum performance using standby logs, with the LGWR and ASYNC attributes enabled on the corresponding log_archive_dest_n parameter. If I understand that correctly, a commit on the primary will complete as soon as the redo is written to the local redo log and the availability of the standby destination will have no performance impact at all. In general the standby will remain only a few seconds behind the primary. If the link between the two goes down, I can alert myself to the situation with a simple query of v$dataguard_stats and correct whatever the underlying problem is.
Can someone please confirm for me whether I am understanding the behavior of commits under these two different protection modes and transport modes?
Also, if I do create standby logs for the one destination, do I also need to create them on the primary and other standby as well.
Thanks.

Here's what I can think of :
Max protection mode will shutdown automatically if no standby destinations available for log transfer. To avoid this at least two log_archive_dest are needed.
Max protection mode will shutdown if lgwr,async and noaffirm is used.
Max Availability will behave like max performance mode when no standby archive destinations available.
Max Availability will remain in max availability mode when standby redo logs will not available.
So it will depend on the business
Best Regards
mseberg

How to add two protection mode in oracle data guard

Hi all,
We have a discussion on oracle physical data guard yesterday.....
As we all know that data guard has 3 protection mode
1. Maximum Performance
2. Maximum Availability (Default)
3. Maximum Protection
Now we were discussing about is it possible to have two protection mode on same data guard simultaneously... for e.g. Maximum performance and maximum availability.
We have searched a lot but don't find any help on google.
Can any one help on this with any doc, pdf or links..
Thanks & Regards

Hi,
you don't find anything on this because it's not possible and would make no sense even if you could do it.
Maximum Availability uses SYNC commit between primary and standby db. If you combine Max. Availabilty with Max. Performance then your db clients have to wait on commit until primary and the max. availability standby have commited. That they would not have to wait on another Max. Performance DB doesn't change anything to the client. You would only combine the disadvantages of both approaches, the wait on sync commit for max. availability and beeing not in sync with primary for the max. performance db.
The max. protection mode requires by definition that the primary db shuts down in case no standby can process the commit. If the primary is not up and running it is pointless to have another (max. availability) standby db at hand, if this max. availability db would take over the service this would violate the defintion of max. protection. No Dataloss is valued higher than db availability, having the data commited only on one db site is not allowed.
Regards
Thomas

Primary db get error ORA-03113 in maximum protection mode

primary db pfile :
cds.__db_cache_size=230686720
cds.__java_pool_size=4194304
cds.__large_pool_size=4194304
cds.__shared_pool_size=71303168
cds.__streams_pool_size=0
*.archive_lag_target=0
*.background_dump_dest='/opt/oracle/database/cds/bdump'
*.control_files='+data/control01.ctl','+data/control02.ctl'
*.db_name='cds'
*.db_recovery_file_dest_size=2147483648
*.db_recovery_file_dest='+data1'
*.db_unique_name='cds'
*.dg_broker_start=FALSE
*.fal_client='cds'
*.fal_server='cdssty'
*.log_archive_config='DG_CONFIG=(cds,cdssty)'
*.log_archive_dest_1='LOCATION=+data2 VALID_FOR=(ALL_LOGFILES,ALL_ROLES) DB_UNIQUE_NAME=cds'
*.log_archive_dest_2='SERVICE=cdssty LGWR SYNC VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=cdssty'
*.log_archive_dest_state_2='ENABLE'
cds.log_archive_format='%t_%s_%r.dbf'
*.log_archive_max_processes=1
*.log_archive_min_succeed_dest=1
*.sga_target=300m
*.standby_archive_dest='+data2'
*.standby_file_management='AUTO'
*.undo_management='auto'
*.undo_tablespace='undocds01'
*.user_dump_dest='/opt/oracle/database/cds/udump'
standby db pfile :-
cdssty.__db_cache_size=213909504
cdssty.__java_pool_size=4194304
cdssty.__large_pool_size=4194304
cdssty.__shared_pool_size=88080384
cdssty.__streams_pool_size=0
*.archive_lag_target=0
*.background_dump_dest='/opt/oracle/database/cdssty/bdump'
*.control_files='+DATA01/control01.ctl','+DATA01/control02.ctl'#Restore Controlfile
*.db_file_name_convert='+data','+data01'
*.db_name='cds'
*.db_recovery_file_dest_size=2147483648
*.db_recovery_file_dest='+data02'
*.db_unique_name='cdssty'
*.dg_broker_start=FALSE
*.fal_client='CDSSTY'
*.fal_server='CDS'
*.log_archive_config='DG_CONFIG=(cdssty,cds)'
*.log_archive_dest_1='LOCATION=+data03 VALID_FOR=(ALL_LOGFILES,ALL_ROLES) DB_UNIQUE_NAME=cdssty'
*.log_archive_dest_2='SERVICE=cds LGWR SYNC VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=cds'
cdssty.log_archive_dest_state_1='ENABLE'
cdssty.log_archive_format='%t_%s_%r.dbf'
*.log_archive_max_processes=1
*.log_archive_min_succeed_dest=1
cdssty.log_archive_trace=0
*.log_file_name_convert='+data','+data01'
*.sga_target=300m
*.standby_archive_dest='+data03'
cdssty.standby_archive_dest='+DATA03'
*.standby_file_management='AUTO'
*.undo_management='auto'
*.undo_tablespace='undocds01'
*.user_dump_dest='/opt/oracle/database/cdssty/udump'
primary database is in maximum protection mode
stanbdy db has two standby redolog file groups
llistener at both the end is up
when i try to open primary databsae i get the error blow:
ERROR at line 1:
ORA-03113: end-of-file on communication channel
i read the alert log and its log are as blow:
Database mounted in Exclusive Mode
Completed: ALTER DATABASE MOUNT
Wed Nov 7 04:28:00 2012
alter database open
Wed Nov 7 04:28:01 2012
LGWR: STARTING ARCH PROCESSES
ARC0: Archival started
LGWR: STARTING ARCH PROCESSES COMPLETE
ARC0 started with pid=16, OS id=13841
Wed Nov 7 04:28:01 2012
LGWR: Primary database is in MAXIMUM PROTECTION mode
LGWR: Destination LOG_ARCHIVE_DEST_1 is not serviced by LGWR
LGWR: Minimum of 1 synchronous standby database required
Wed Nov 7 04:28:01 2012
Errors in file /opt/oracle/database/cds/bdump/cds_lgwr_13720.trc:
ORA-16072: a minimum of one standby database destination is required
Wed Nov 7 04:28:01 2012
Errors in file /opt/oracle/database/cds/bdump/cds_lgwr_13720.trc:
ORA-16072: a minimum of one standby database destination is required
LGWR: terminating instance due to error 16072
Instance terminated by LGWR, pid = 13720
and the contents of /opt/oracle/database/cds/bdump/cds_lgwr_13720.trc are:
/opt/oracle/database/cds/bdump/cds_lgwr_13720.trc
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options
ORACLE_HOME = /opt/oracle/product
System name: Linux
Node name: Host1
Release: 2.6.18-128.el5
Version: #1 SMP Wed Dec 17 11:42:39 EST 2008
Machine: i686
Instance name: cds
Redo thread mounted by this instance: 1
Oracle process number: 6
Unix process pid: 13720, image: oracle@Host1 (LGWR)
*** 2012-11-07 04:28:01.123
*** SERVICE NAME:() 2012-11-07 04:28:01.122
*** SESSION ID:(45.1) 2012-11-07 04:28:01.122
Destination LOG_ARCHIVE_DEST_1 is not serviced by LGWR
Standby database verification failed:16072
ORA-16072: a minimum of one standby database destination is required
error 16072 detected in background process
ORA-16072: a minimum of one standby database destination is required
if i open primary db in maximum availability mode its working fine ..
the problme is only with maximum protection mode
plz tell me what is wrong with my configuration

hi thanx again,
i read both the oracle links u suggest me in your previous post ,but i have not found any thing like,min 2 standby database require for maximum protection mode,
in first link :-
5.6.1.1 Maximum Protection Mode
This protection mode ensures that no data loss will occur if the primary database fails. To provide this level of protection, the redo data needed to recover each transaction must be written to both the local online redo log and to the standby redo log on at least one standby database before the transaction commits_. To ensure data loss cannot occur, the primary database shuts down if a fault prevents it from writing its redo stream to at least one remote standby redo log. For multiple-instance RAC databases, Data Guard shuts down the primary database if it is unable to write the redo records to at least one properly configured database instance. The maximum protection mode requires that at least one standby instance has a standby redo log and the LGWR, SYNC, andAFFIRM attributes be used on the LOG_ARCHIVE_DEST_n parameter for this destination.
and second link:-
Maximum protection This protection mode ensures that no data loss will occur if the primary database fails. To provide this level of protection, the redo data needed to recover each transaction must be written to both the local online redo log and to the standby redo log on at least one standby database before the transaction commits_. To ensure data loss cannot occur, the primary database shuts down if a fault prevents it from writing its redo stream to the standby redo log of at least one transactionally consistent standby database.
Plz correct me if i m wrong
thanx in advance

Configuring maximum protection mode in dataguard with oracle 10g

Dear All,
I am facing a big problem in my configuration for oracle dataguard in maximum protection mode. as per oracle documentation i have done the following.
on the primary database i configured the floowing parameter.
LOG_ARCHIVE_DEST_2='SERVICE=CDER LGWR SYNC AFFIRM
VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE)
DB_UNIQUE_NAME=CDER'
on the standby i configured the following parameters.
LOG_ARCHIVE_DEST_2='SERVICE=REDC LGWR SYNC AFFIRM
VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE)
DB_UNIQUE_NAME=REDC'
i created standby redo logs on the standby database as per documentation.
I shut down the primary database and started it in mount stage and i executed the following commands.
SQL> ALTER DATABASE SET STANDBY DATABASE TO MAXIMIZE PROTECTION
after database was sucessfully alterd, i execute it the following command to open the database.
SQL > ALTER DATABASE OPEN;
what is happening is that i am recieving the Error end of communication channel and also after i look at the log file the following error is in place
Thu Jul 22 23:33:37 2010
Errors in file c:\oracle\product\10.2.0\admin\redc\bdump\redc_psp0_1088.trc:
ORA-16072: a minimum of one standby database destination is required
though when i reset the dataguard to maximize performance it work really successful and the database open;
please guys guide me through this

you got it
redc.__db_cache_size=1056964608
redc.__java_pool_size=16777216
redc.__large_pool_size=16777216
redc.__shared_pool_size=318767104
redc.__streams_pool_size=0
*.audit_file_dest='C:\oracle\product\10.2.0\admin\REDC\adump'
*.background_dump_dest='C:\oracle\product\10.2.0\admin\REDC\bdump'
*.compatible='10.2.0.3.0'
*.control_files='C:\oracle\product\10.2.0\oradata\REDC\control01.ctl','C:\oracle\product\10.2.0\oradata\REDC\control02.ctl','C:\oracle\product\10.2.0\oradata\REDC\control03.ctl'
*.core_dump_dest='C:\oracle\product\10.2.0\admin\REDC\cdump'
*.db_block_size=8192
*.db_domain=''
*.db_file_multiblock_read_count=8
*.DB_FILE_NAME_CONVERT='C:\oracle\product\10.2.0\oradata\CDER','C:\oracle\product\10.2.0\oradata\REDC','D:\oracle\oradata\CDER','D:\oracle\oradata\REDC'
*.db_name='REDC'
*.DB_UNIQUE_NAME='REDC'
*.dispatchers='(PROTOCOL=TCP) (SERVICE=REDCXDB)'
*.FAL_CLIENT='REDC'
*.FAL_SERVER='CDER'
*.job_queue_processes=10
*.LOG_ARCHIVE_CONFIG='DG_CONFIG=(REDC,CDER)'
*.LOG_ARCHIVE_DEST_1='LOCATION=D:\oracle\Archives
VALID_FOR=(ALL_LOGFILES,ALL_ROLES)
DB_UNIQUE_NAME=REDC'
*.LOG_ARCHIVE_DEST_2='SERVICE=CDER LGWR SYNC AFFIRM
VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE)
DB_UNIQUE_NAME=CDER'
*.LOG_ARCHIVE_DEST_STATE_1='ENABLE'
*.log_archive_dest_state_2='ENABLE'
*.LOG_ARCHIVE_FORMAT='%t_%s_%r.arc'
*.LOG_ARCHIVE_MAX_PROCESSES=5
*.LOG_FILE_NAME_CONVERT='D:\oracle\Archives','D:\oracle\Archives'
*.open_cursors=300
*.pga_aggregate_target=471859200
*.processes=150
*.REMOTE_LOGIN_PASSWORDFILE='EXCLUSIVE'
*.sga_target=1417674752
*.STANDBY_FILE_MANAGEMENT='AUTO'
*.undo_management='AUTO'
*.undo_tablespace='UNDOTBS1'
*.user_dump_dest='C:\oracle\product\10.2.0\admin\REDC\udump'

Dataguard 'max protection' mode failed

Testing Dataguard in MAX PROTECTION mode on Oracle 10.2.0.4 on Solaris x86_64.
Test 1: Primary remained up allowing transactions to continue inspite of the fact that the server running the standby database was not reachable. Waited for over 10 minutes and then cancelled the test. All that happened was the protection_level changed to resynchronization. I could not believe my eyes. Is this possible?
Test 2: The primary shutdown automatically but after about 6 minutes of the standby database was shut abort. So what about all those transactions that took place during those 6 minutes? Those would be lost - isnt it?
I just cant believe this. Where am I going wrong? I confirmed that LAD_2 was set to lgwr sync affirm. And that protection mode was set to 'maximum protection'.
Somebody, pls enlighten me?
Thanks
Edited by: user12022918 on 27-May-2013 08:42

If you have several physical standby database for the same primary database then this could be expected behaviour otherwise this looks like a bug that you should report to Oracle Support who will very likely ask you to upgrade at least to 10.2.0.5 patchset or 11.2.0.3.

Database is High Protection Mode

Dear Friends,
I configured dataguard standby database in oracle 11g.Then i did the following scenario's.
1)I changed the protection mode to "High protection".
2)Shutdown the standby database.
As per the document, The primary database shutdown when standby database is down in High Protection Mode.
But my primary database did not shutdown. But if i fire "alter system switch logfile;", It get hangs. But parllely, I can able to login to primary db as normal user.
Can anybody explain what happen if database in "High Protection" Mode?
Thanks in advance.

Hello;
Can you post the results of this run on the Primary :
SELECT PROTECTION_MODE FROM V$DATABASE;The Protection modes are "Maximum availability", "Maximum performance","Maximum protection" They are described in detail here
1.4 Data Guard Protection Modes - http://docs.oracle.com/cd/E11882_01/server.112/e10700.pdf
If you search E10700-02 there is no "High protection" mode, so I'm not sure what you did. Maximum availability provides the highest protection, but also requires "SYNC" for your log_archive_dest_n parameter.
My own example is here :
http://www.visi.com/~mseberg/protection_mode.html
Best Regards
mseberg
Edited by: mseberg on Aug 8, 2012 2:04 PM

Problem in protection mode dataguard

Hi,
i want to store standby redo log archived file in separate folder, so that i specified
log_archive_dest_1='LOCATION=D:\oracle\product\10. 2.0\flash_recovery_area\stby VALID_FOR=ALL_LOGFILES,ALL_ROLES) DB_UNIQUE_NAME=stby
standby_archive_dest=D:\oracle\product\10. 2.0\flash_recovery_area\stby\arcst
If both parameters are specified, the STANDBY_ARCHIVE_DEST initialization
parameter overrides the directory location specified with the LOG_ARCHIVE_DEST_n
parameter.
but in my system it store all archive files in LOG_ARCHIVE_DEST_1..
normally if you change primary database protection mode into maximize availability ,then it should automatically change standby database into that mode ...
primary database(live).
should i change this mode in both primary and standby database????
SQL> select protection_mode,protection_level from v$database;
PROTECTION_MODE PROTECTION_LEVEL
MAXIMUM AVAILABILITY RESYNCHRONIZATION
SQL> alter database open;
Database altered.
SQL> alter system switch logfile;
System altered.
SQL>
standby database(stby)
alert file
Primary database is in MAXIMUM PERFORMANCE mode
RFS[2]: Successfully opened standby log 4: 'D:\ORACLE\PRODUCT\10.2.0\ORADATA\STBY\REDO04.LOG'
Thu Aug 06 08:48:15 2009
Media Recovery Log D:\ORACLE\PRODUCT\10.2.0\FLASH_RECOVERY_AREA\STBY\ARC00093_0693601814.001
Media Recovery Waiting for thread 1 sequence 94 (in transit)
Thu Aug 06 08:48:18 2009
Recovery of Online Redo Log: Thread 1 Group 4 Seq 94 Reading mem 0
Mem# 0: D:\ORACLE\PRODUCT\10.2.0\ORADATA\STBY\REDO04.LOG
SQL> select protection_mode,protection_level from v$database;
PROTECTION_MODE PROTECTION_LEVEL
MAXIMUM PERFORMANCE MAXIMUM PERFORMANCE
Oracle 10g

selva,
log_archive_dest_1='LOCATION=D:\oracle\product\10. 2.0\flash_recovery_area\stby VALID_FOR=ALL_LOGFILES,ALL_ROLES) DB_UNIQUE_NAME=stby
standby_archive_dest=D:\oracle\product\10. 2.0\flash_recovery_area\stby\arcst is correct and will not override your primary entry... the log_archive_dest_1 is where your primary logs are generated and standby_archive_dest is where your logs will come when current server acts as secondary.
your actual question is regarding protection modes....? is that correct
after you chnage the protection mode did you stop managed recovery and bounce the database on stby,,,
try this and let me know
hth

Standby protection mode

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