Duplicate vs Standby -- What To Do Without Data Guard

WHAT WE HAVE
Three 10.2.0.3.0 databases in production on the same Linux x86 server (Red Hat OS). An identical Linux x86 server (with same OS) is available for housing a corresponding backup instance (either duplicate or physical standby).
THE ASSIGNMENT
Develop a plan that, in the event of a loss of our prod server, provides the shortest time before substitute databases are up and running on the backup server. WE CANNOT USE DATA GUARD (due to server licensing issues). It isn't necessarily a high priority to apply archive logs to duplicates or standbys on a regular basis, but I realize the more up-to-date a backup database is, the less recovery time would be needed if and when it's pressed into service. (BTW: We take weekly incremental level 0 and daily incremental level 1 backups of our prod databases with RMAN and keep them for 28 days.)
QUESTIONS
1. Does our 'no Data Guard' rule eliminate using standbys - even if I could use OS processes to transfer archive logs between servers and manually apply redo? (I'm not quite sure what exactly constitutes Data Guard.)
2. If I'm allowed to create standbys, I'll create them using RMAN. Since the scenario being planned for is a loss of the production server, I figure I'm worried about failover and not switchover. Thus, once standbys are created, in addition to manually transferring and applying archives and creating redo files for them, what other action(s) would I need to take before they could be activated, if that's ever needed? Would the redo files I would have to create be of type STANDBY or ONLINE?
3. Can a standby be opened in read/write mode without being activated?
4. If I can only use duplicates and if the production server were to go down one day, could the most recent valid RMAN backup(s) for the prod databases be used in recovering the duplicates?
I'd prefer the backup instances have the SAME SID (db_name) as the corresponding one in prod, if possible.
Thanks.

Hi
1. Does our 'no Data Guard' rule eliminate using standbys - even if I could use OS processes to transfer archive logs between servers and manually apply redo? (I'm not quite sure what exactly constitutes Data Guard.)
Ans:- yes if you are able to transfer archivelog to standby destination ,you also have to register archivelogs in controlfile manually,then only you can recover standby with archivelogs.
2. If I'm allowed to create standbys, I'll create them using RMAN. Since the scenario being planned for is a loss of the production server, I figure I'm worried about failover and not switchover. Thus, once standbys are created, in addition to manually transferring and applying archives and creating redo files for them, what other action(s) would I need to take before they could be activated, if that's ever needed? Would the redo files I would have to create be of type STANDBY or ONLINE?
Ans:- Yes you can use RMAN to create standby database.you need to activate standby only with the case of failover.Standby logfile is needed if you use Real Time redo apply .In your case you are not enabling Data Guard to transport logs ,so it is not possible to Real Time apply.
3. Can a standby be opened in read/write mode without being activated ?
Ans:- Yes,If you do switchover/failover to open for read/write.Without switchover/failover you can open only in read only mode.
4. If I can only use duplicates and if the production server were to go down one day, could the most recent valid RMAN backup(s) for the prod databases be used in recovering the duplicates?
Ans:- IF you make duplicate database then it will not accept any log from primary database.
Hope this will help you.
Regards
Tinku

Similar Messages

Setting up the standby side after a crash (Data Guard)

Hi,
I hope this is the right area to publish my problem...
I can't find something like codetags for the system output - so I'm sorry for the bad looking
I have a problem. I use Oracle 11.2.0.3.0 with a dataguard environment. My primary database crashed and I activate the standby to be the new primary.
After the old primary gets repaired I want to define them as the ney standby. This didn't work because we have disabled flashback logging.
We created the new standby:
rman target sys/password@prim auxiliary sys/password@stby
duplicate target database for standby from active database;
After this we do this on the new standby:
alter database recover managed standby database disconnect from session;
It looks the now there is a working physical standby.
Now I look on the primary dataguard:
DGMGRL> show database verbose stby;
Database - stby
Role:            PHYSICAL STANDBY
Intended State: APPLY-ON
Transport Lag:   (unknown)
Apply Lag:       (unknown)
Real Time Query: OFF
Instance(s):
    dbuc4
Properties:
    DGConnectIdentifier             = 'stby'
    ObserverConnectIdentifier       = ''
    LogXptMode                      = 'ASYNC'
    DelayMins                       = '0'
    Binding                         = 'optional'
    MaxFailure                      = '0'
    MaxConnections                  = '1'
    ReopenSecs                      = '300'
    NetTimeout                      = '30'
    RedoCompression                 = 'DISABLE'
    LogShipping                     = 'ON'
    PreferredApplyInstance          = ''
    ApplyInstanceTimeout            = '0'
    ApplyParallel                   = 'AUTO'
    StandbyFileManagement           = 'AUTO'
    ArchiveLagTarget                = '900'
    LogArchiveMaxProcesses          = '4'
    LogArchiveMinSucceedDest        = '1'
    DbFileNameConvert               = ''
    LogFileNameConvert              = ''
    FastStartFailoverTarget         = ''
    InconsistentProperties          = '(monitor)'
    InconsistentLogXptProps         = '(monitor)'
    SendQEntries                    = '(monitor)'
    LogXptStatus                    = '(monitor)'
    RecvQEntries                    = '(monitor)'
    SidName                         = 'dbuc4'
    StaticConnectIdentifier         = '(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=stby)(PORT=1521))(CONNECT_DATA=(SERVICE_NAME=stby_DGMGRL.blubb.de)(INSTANCE_NAME=stby)(SERVER=DEDICATED)))'
    StandbyArchiveLocation          = 'USE_DB_RECOVERY_FILE_DEST'
    AlternateLocation               = ''
    LogArchiveTrace                 = '0'
    LogArchiveFormat                = '%t_%s_%r.arc'
    TopWaitEvents                   = '(monitor)'
Database Status:
ORA-16795: the standby database needs to be re-created
DGMGRL> show database verbose prim;
Database - prim
Role:            PRIMARY
Intended State: TRANSPORT-ON
Instance(s):
    dbuc4
    dbuc4stby
Properties:
    DGConnectIdentifier             = 'prim'
    ObserverConnectIdentifier       = ''
    LogXptMode                      = 'ASYNC'
    DelayMins                       = '0'
    Binding                         = 'OPTIONAL'
    MaxFailure                      = '0'
    MaxConnections                  = '1'
    ReopenSecs                      = '300'
    NetTimeout                      = '30'
    RedoCompression                 = 'DISABLE'
    LogShipping                     = 'ON'
    PreferredApplyInstance          = ''
    ApplyInstanceTimeout            = '0'
    ApplyParallel                   = 'AUTO'
    StandbyFileManagement           = 'AUTO'
    ArchiveLagTarget                = '0'
    LogArchiveMaxProcesses          = '4'
    LogArchiveMinSucceedDest        = '1'
    DbFileNameConvert               = ''
    LogFileNameConvert              = ''
    FastStartFailoverTarget         = ''
    InconsistentProperties          = '(monitor)'
    InconsistentLogXptProps         = '(monitor)'
    SendQEntries                    = '(monitor)'
    LogXptStatus                    = '(monitor)'
    RecvQEntries                    = '(monitor)'
    SidName(*)
    StaticConnectIdentifier(*)
    StandbyArchiveLocation(*)
    AlternateLocation(*)
    LogArchiveTrace(*)
    LogArchiveFormat(*)
    TopWaitEvents(*)
    (*) - Please check specific instance for the property value
Database Status:
SUCCESS
DGMGRL> show database verbose dbuc4stby;
Database - dbuc4stby
Role:            PRIMARY
Intended State: TRANSPORT-ON
Instance(s):
    dbuc4
    dbuc4stby
Properties:
    DGConnectIdentifier             = 'dbuc4stby'
    ObserverConnectIdentifier       = ''
    LogXptMode                      = 'ASYNC'
    DelayMins                       = '0'
    Binding                         = 'OPTIONAL'
    MaxFailure                      = '0'
    MaxConnections                  = '1'
    ReopenSecs                      = '300'
    NetTimeout                      = '30'
    RedoCompression                 = 'DISABLE'
    LogShipping                     = 'ON'
    PreferredApplyInstance          = ''
    ApplyInstanceTimeout            = '0'
    ApplyParallel                   = 'AUTO'
    StandbyFileManagement           = 'AUTO'
    ArchiveLagTarget                = '0'
    LogArchiveMaxProcesses          = '4'
    LogArchiveMinSucceedDest        = '1'
    DbFileNameConvert               = ''
    LogFileNameConvert              = ''
    FastStartFailoverTarget         = ''
    InconsistentProperties          = '(monitor)'
    InconsistentLogXptProps         = '(monitor)'
    SendQEntries                    = '(monitor)'
    LogXptStatus                    = '(monitor)'
    RecvQEntries                    = '(monitor)'
    SidName(*)
    StaticConnectIdentifier(*)
    StandbyArchiveLocation(*)
    AlternateLocation(*)
    LogArchiveTrace(*)
    LogArchiveFormat(*)
    TopWaitEvents(*)
    (*) - Please check specific instance for the property value
Database Status:
SUCCESS
DGMGRL> show configuration
Configuration - dg
Protection Mode: MaxPerformance
Databases:
    prim - Primary database
    stby     - Physical standby database (disabled)
      ORA-16795: the standby database needs to be re-created
Fast-Start Failover: DISABLED
Configuration Status:
SUCCESS
On the stby side it looks like:
DGMGRL> show configuration
ORA-16795: Die Standby-Datenbank muss neu erstellt werden (The standby database needs to be recreated)
Did I have to create a new dataguard configuration?
I didn't know how I get this to work.
Thx fuechsin

Hi,
first of all: big thanks for your answer!
I think, this was a bad idea, too. But there was not enough space, so we decided to turn it off without thinking of consequences. :/
When the new hardware arrive I will enable flashback and never turn it off
The dataguard-log on the stby says:
01/23/2014 11:56:13
>> Starting Data Guard Broker bootstrap <<
Broker Configuration File Locations:
      dg_broker_config_file1 = "/Daten/stby/stby_dgbroker1.dat"
      dg_broker_config_file2 = "/Daten/stby/stby_dgbroker2.dat"
01/23/2014 11:56:17
Database needs to be reinstated or re-created, Data Guard broker ready
I want to try to delete the configuration on the prim and stby side and reconfigure it. But I don't know if there are side-effects on the working prim side - it is a productive system.
Best regards,
fuechsin

Data Guard Standby Lost A Drive Or Two

So a data guard standby is somewhat disgruntled because the SAN imploded and the standby lost a couple mount points. It wasn't running ASM so no self-repairing can occur. Since this is the first time I've had a serious issue with a standby and since much of what I do is restricted (RMAN complains because it's a standby and read-only)... I'm just curious if someone could point me towards a comprehensive "what to do when your STANDBY has issues" book, document, or link. They are surprisingly scarce. Most comments online simply say (paraphrased) "scorch the earth, salt the fields, and rebuild fresh."
Thank you

Hello;
Depends what you lost.
1. You can just rebuild.
2. You might be able to use RMAN roll forward.
http://www.oracle-ckpt.com/?s=standby+scn&op.x=30&op.y=17
http://emrebaransel.blogspot.com/2008/12/recover-dataguard-from-lost-archivelog.html
3. If you are Oracle 11 you can use RMAN active duplicate to rebuild.
http://www.visi.com/~mseberg/standby_creation_from_active_database_using_rman.html
4. Other
Recover Lost Datafile On Standby
http://hemendraoracleblogs.blogspot.com/2012/11/recover-lost-datafile-from-standby.html
http://allthingsoracle.com/data-guard-physical-standby-database-best-practices-part-ii/
http://stackoverflow.com/questions/8135393/how-do-you-re-duplicate-a-broken-physical-standby-database
Best Regards
mseberg

Difference between Manual Standby and Data Guard Broker..

hi,
could any let me know any usefull docs which help to understand the difference between manual dr and data guard broker?
thanks,

>
could any let me know any usefull docs which help to understand the difference between manual dr and data guard broker?
>
Without Data Guard Broker:
http://www.oracle.com/pls/db112/to_toc?pathname=server.112/e17022/toc.htm
With Data Guard Broker:
http://www.oracle.com/pls/db112/to_toc?pathname=server.112/e17023/toc.htm
See especially why you want to use the broker:
http://download.oracle.com/docs/cd/E11882_01/server.112/e17023/concepts.htm#i1013106
In short: You should have a good reason if you do not use the broker, because it is the officially recommended way to maintain Data Guard. It is even required for some features like Fast-Start Failover.
Kind regards
Uwe Hesse
http://uhesse.wordpress.com

License Type Requirements To Use Data Guard For Oracle EE

Hi,
I haven't been able to get a straight answer on this, so hopefully someone can help me.
We currently have two physical servers, both licensed to run Oracle Database 11gR2 EE, however one is running a cpu-based license (primary server/production) and the other is running a named-user based license (secondary server/soon-to-be-standby server).
I had no hand in selecting the license model, so this is what I have to work with. So the question is this: With this type of license model differences, can I use Oracle Data Guard?
Our Oracle software vendor says no because of the differences in the license models.
Any feedback would be invaluable. Thanks.

That is so because there is not much to say about it: You create your standby as described in the Data Guard doc (RMAN DUPLICATE)
Then you ship the Archivelogs to the standby and do recover database there. Technically easy. No higher protection mode possible, though.
I am no License Specialist, but I think that you will always need some kind of license for the standby database - even if you maintain it this way.
My recommendation would be to clarify with your company first what your Recovery Point Objective is - can you live with the probably high amount of data loss in case of Disaster on the Primary?
If not - purchase the correct license and continue with Data Guard Best Practices instead of doing a home grown solution.
Security is not cheap.
Kind regards
Uwe Hesse
http://uhesse.wordpress.com

Data Guard Broker fails with ORA-16635 and ORA-03135

Hi All,
I configured Oracle RAC with Dataguard 11.2 on Windows 2003.
I've already configured Standby without Data Guard Broker and everything is working fine, but when I try to use Data Guard Broker, he can not synchronize the files from the Data Guard Broker.
I've tried everything including MOS, but not found anything.
I'm getting this error.
From Primary
DG 2011-02-11-09:15:41        0 2 0 NSV1: (MIV = 57) Start sending metadata file: "+DG_DATA/orcl/dgbroker/dg_config_file1.dat"
DG 2011-02-11-09:15:41        0 2 0 NSV1: Sending block #1 (containing MIV = 57), 67 blocks
DG 2011-02-11-09:15:42        0 2 0 NSV1: Error sending block #1, size 67 blocks. Error is ORA-16635.
DG 2011-02-11-09:15:42        0 2 0 NSV1: Current network link for metadata resync is broken.
DG 2011-02-11-09:15:42        0 2 0 NSV1: (MIV = 57) End metadata file transmission: opcode CTL_ENABLE (1.1.1825138532)
DG 2011-02-11-09:15:42        0 2 0 NSV1: Can't send CLOSE message to DRCX. Network error is: ORA-16635.
DG 2011-02-11-09:15:42        0 2 0 NSV1: Error is ORA-03135 connection lost contact
DG 2011-02-11-09:15:42        0 2 0 NSV1: Current network link for metadata resync is broken.From Standby
DG 2011-02-11-08:35:39 3001000 3 1825138419       for opcode = CTL_ENABLE, phase = RESYNCH, req_id = 1.1.1825138419
DG 2011-02-11-08:35:39        0 2 0 NSV2: Error sending block #1, size 67 blocks. Error is ORA-16635.
DG 2011-02-11-08:35:39        0 2 0 NSV2: Current network link for metadata resync is broken.
DG 2011-02-11-08:35:39        0 2 0 NSV2: (MIV = 11) End metadata file transmission: opcode CTL_ENABLE (1.1.1825138419)
DG 2011-02-11-08:35:39        0 2 0 NSV2: Can't send CLOSE message to DRCX. Network error is: ORA-16635.
DG 2011-02-11-08:35:39        0 2 0 NSV2: Current network link for metadata resync is broken.
DG 2011-02-11-08:35:39        0 2 0 NSV2: Metadata Resync failed. Status = ORA-16635
DG 2011-02-11-08:35:39 3001000 3 1825138419 DMON: Database ORCLSTBY returned ORA-16635

Hi,
Are you using firewall between Hosts?
If yes check if firewall is blocking yours connections.
Set the following parameter in the sqlnet.ora file that would be referenced by each database, primary and standby.
SQLNET.EXPIRE_TIME=n
Where n is some number of minutes. Preferably below 10. When this parameter is enabled, a small 10 byte probe packet will be sent from node to node at specific intervals.
Regards,
Levi Pereira

How to remove data guard broker configuration when ORA-16625?

I setup data guard broker for a standby database. However, we recreate the database and re-setup the standby database. But find the earlier broker configuration still exists. But I cannot remove or disable the configuration or any database within the configuration. When I try to do so I got the error, although all network settings are correct:
Error: ORA-16625: cannot reach the database
How to remove the configuration at this stage?
Thanks for help,

Hi, I saw same issue when doing switchover testing in my lab environment.prerequisite is primary role and standby role switched and og can be applied without data guard broker.
Here is the step I resolved the issue
1)on both primary and standby database
SQL> alter system set dg_borker_start=false;
on primary DB:
SQL>alter system set dg_broker_config_file1='?/dbs/dr1afterswichoverpry.dat';
SQL>alter system set dg_broker_config_file1='?/dbs/dr2afterswichoverpry.dat';
on standby DB:
SQL>alter system set dg_broker_config_file1='?/dbs/dr1afterswichoverstby.dat';
SQL>alter system set dg_broker_config_file1='?/dbs/dr2afterswichoverstby.dat';
2) enable dg_borker_start on both primay and sandbby db
SQL> alter system set dg_borker_start=true;
3)on primary database to create configuration
Hope this can help you!
email: [email protected]

Data Guard Manager GUI does not respond

Hello,
I configured a standby datase environment using the Data Guard(9.0.1). Both, the primary and standby are 9.0.1
Few days ago, the standby crashed and i was getting an Ora-12500 error. To solve that error i had to recreate the oracle instance. After that, the primary established connection to the standby and shipped the logs which were applied by the stand. But when i connect to the Data Guard Manager GUI and click on my data guard configuration, the cursor shows up and keep running on the screen indicating that the DGMGUI is working on the background. I left DGMGUI running overnigth but it did not finished. I don't know what is the problem. Any hint ?
Thanks a lot.
Hardy.

You probably want to post this in the General Database forum.
Thanks.

Remove Data Guard Broker configuration file

Hi,
We have a data guard configuration running on Oracle 10g RAC (2 nodes) ASM. After failover, we rebuild the old primary as physical standby. But every time when enable the data guard broker, it created problems. So the best solution for us seems to completely remove the data guard broker configuration and recreate them. Here are our steps
On both primary and standby
1) alter system set DG_BROKER_START=FALSE
2) shutdown database
3) use asmcmd command to remove the broker directory under +DATA/dbname/DG_BROKER
4) start the database
5) alter system set DG_BROKER_START=TRUE
6) go through the many steps to recreate data guard broker configuration
I am just curious whether this is the right way and whether there is any simple way?
Thanks in advance

Hi, I saw same issue when doing switchover testing in my lab environment.prerequisite is primary role and standby role switched and og can be applied without data guard broker.
Here is the step I resolved the issue
1)on both primary and standby database
SQL> alter system set dg_borker_start=false;
on primary DB:
SQL>alter system set dg_broker_config_file1='?/dbs/dr1afterswichoverpry.dat';
SQL>alter system set dg_broker_config_file1='?/dbs/dr2afterswichoverpry.dat';
on standby DB:
SQL>alter system set dg_broker_config_file1='?/dbs/dr1afterswichoverstby.dat';
SQL>alter system set dg_broker_config_file1='?/dbs/dr2afterswichoverstby.dat';
2) enable dg_borker_start on both primay and sandbby db
SQL> alter system set dg_borker_start=true;
3)on primary database to create configuration
Hope this can help you!
email: [email protected]

Data guard performance problem (rac to single instance)

i have a table it has GPS data, and gps table has too many data, 5 millions,
iam using RAC (2 nodes 11gr2). standby database is single instance data guard,
single instance database (standby)'s hardware cpu is lower than RAC machines. rac nodes have (15k) disks, standby has (7200rpm),
so i dont want to use GPS tables on data guard system, i dont want to run GPS table's DML commands (delete, insert), i think it may increase performance,
is it posible? what is your advise?
any feedback makes me happy,
best regards

it's not possible with data guard, but you can use streams or golgengate for this purpose. Have a look at dataguard performance tuning guide. Maybe there is something you can fix on the configuration to be faster.
[Data Guard Redo Apply and Media Recovery Best Practices|http://www.oracle.com/technetwork/database/features/availability/maa-wp-10grecoverybestpractices-129577.pdf]
[Redo Transport and Network Best Practices|http://www.oracle.com/technetwork/database/features/availability/maa-wp-11gr1-activedataguard-1-128199.pdf]
I don't know an 11g version for these docs but they would still help.

Oracle8i Data Guard

My company is interested to use Data Guard to provide standby database at standby site. Does oracle8i Data Guard available for AIX ? or anybody done it before ? Please advice.
Thanks
Sam

Hi samuel,
I know this might kind of sound
silly here, but I would like to
know WHAT REALLY IS 8iLite? Is it
the sql component of Oracle, I
mean where one can create,store and
manipulate objects like Tables,
Views, Procedures e.t.c
Is it the database where I get to
see the SQL> prompt and where I
type my SELECT statements, CREATE
statements e.t.c.
Please reply.
UA

Data Guard data population issue

Hi ...
I have data guard config with a scenario that new user schema is created (couple tablespaces and datafiles). The tablespace is setup in NOLOGGING mode. After checking the physical standby server, the datafiles are created.
My questions:
1. How to re-sync data from primary to physical standby assuming schema has created and no data has populated?
2. How to drop the data in physical standby server on the same schema with primary server re. above issue, then start the objective on 1.?
My environments are in AIX 5L with 9.2.0.4 in Unicode character set.
Thanks in advance for any information.
Cheers.
BAM

Hi Justin.
Thanks for your reply.
I have restored the tablespaces to logging mode again, and redo schema creation and re-import the data to the schema. When I did the db switch over, the primary site successfully changed to standby -- the opposite works well also.
However, after querying these:
SELECT NAME, UNRECOVERABLE_CHANGE# FROM V$DATAFILE;
SELECT UNRECOVERABLE_CHANGE#,
TO_CHAR(UNRECOVERABLE_TIME, 'mm-dd-yyyy hh:mi:ss')
FROM V$DATAFILE;
on my primary site, there was 5591564 bytes of unrecoverable_change# on one of the datafile on 05-06-2004 02:44:48am. Then on 05-05-2004 10:51:34 the unrecoverable_change# was gone (becomes 0) for the same datafile.
In the doc. the unrecoverable_change# will be shown if somehow datablock error like following:
ORA-01578: ORACLE data block corrupted (file # 1, block # 2521)
ORA-01110: data file 1: '/oracle/dbs/stdby/tbs_1.dbf'
ORA-26040: Data block was loaded using the NOLOGGING option
happened. I've checked my logs in primary/standby alert logs and the data guard switch-over logs -- no similar error as above.
Any idea what was happened on above scenario?
Thanks.
BAM

Need suggestion on Active data guard or Logical Stand by

Hi All,
Need a suggestion of on below scenario.
We have a production database ( oracle version 11g R2 ) and planning to have a Logical standby or physical standy (Active data guard). Our usage of the standby database is below.
1) Planning to run online reports (100+) 24x7. So might create additional indexes,materialized views etc.
2) daily data feed ( around 300+ data files ) to data warehouse. daily night, jobs will be scheduled to extract data and send to warehouse. Might need additional tables for jobs usage.
Please suggest which one is good.
Regards,
vara.

Hello,
In active dataguad Whig is feature from 11gRx ,
If you choose active dataguard, you have couple of good options, one is you can make a high availability of your production database, which can act as image copy of production, as you are asking in 11g you have more advantage where you can open in read only mode and at the sometime MRP will be active, so you can redirect users to connect standby to perform select operations for reporting purpose. So that you can control much load on production ,
Even uou can perform switchover in case of role change, perform failover if your primary is completely lost. Also you can convert to physical to logical standby databases & you can configure FSFO
You have plenty of options with active dataguard.
Refer http://www.orafaq.com/node/957
consider closing the thread if answered and keep the forum clean.
>
User Profile for user11261773
user11261773
Handle:     user11261773
Status Level:     Newbie
Registered:     Jul 14, 2011
Total Posts:     12
Total Questions:     6 (5 unresolved)
>
Edited by: CKPT on Mar 18, 2012 8:14 PM

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

Rman clone ? duplicate database ? data guard ? standby database?

hey there !!
What is the difference between Rman clone , duplicate database , data Guard , standby db?
1 more thing , standby database and duplicate database are same??

RMAN Clone : you take backup of a database on one server ,then take it to other server ,again use RMAN to restore the database,A lot manual intervention is needed in this method
RMAN DUPLICATE: same as above just that manual intervention is less. With 11gR2 there active database duplication in which you can clone your test database directly from production database without taking and then transferring the backup to test server.
Standby Database :they are of two types Physical and logical.The setup is done using RMAN with any of the above methods.Standby is the in-sync (can have some delay) version of primary database either block by block which is physical standby configuration or SQL statment wise which is logical standby.
Data Guard:This is also a standby configuration.Here the failover and switchover are automated with the help of DGMGRL utility.In manual standby this same can be done via SQL*PLUS using sql commands

Duplicate vs Standby -- What To Do Without Data Guard

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