Roll forward standby database

hi.
i'd like to roll forward standby 9.2.0.8 database using backup of primary made with rman. there is Note:290817.1 on this topic. the only problem is that we don't use recovery catalog at our site.
can i create standby controlfile on primary (it'll contain information about recent backups then) and somehow replace controlfile on standby with this newly created one? and then somehow recover standby with rman...
what do you think? if this procedure can be performed, i could then do 'nologging' maintenance on primary which in turn greately reduce maintenance time and amount of archived logs generated.

You could create the "standby" as a physical clone
of the databaseyes. and i did it several times. whith assistant of rman, ofcourse. not a fast procedure i'd say. copying of 800GB took about 2-3 hours even over fc.
and keep it in continuous "roll-forward" using your
own scripts / procedures.
That would be with normal controlfile backup (instead
of a standby controlfile).that would be a mess. i'd like to use standard oracle features/procedures to achieve HA.
However, if your primary runs nologging transactions
you'd still have to
take backups of the database files from the primary
to the cloned "standby".though it is not applicable to my case i just curious: is that possible at all with rman? AFAIK, cloned database is an another incarnation of primary db. and
backup taken on primary won't work with such clone.
So, after every completion of the nologging jobs,
backup and copy over the
update database files.i know that. it is stated clearly in documentation. so immediately after nologging operations i plan to take incrementab backup and use that backup to roll forward standby.
thats the plan :-)

Similar Messages

Roll Forward consistent-closed database copy, that hasn't been opened yet

Hi Oracle DBAs,
I was told that it is possible to do this;
1. Shutdown the database
2. copy accross to another server
3. mount the database
4. roll forward the database if there had been some archived redo logs generated after the original database had been started up.
Please if you can provide the command(s) to do that...
Thanks,
Marc.

Aman,
thanks for the notes on using the RMAN Duplicate commands, ultimately, we will be going down that path to use RMAN, and the notes will be the first place I look at to start.
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Forward physical standby archivelog files to a logical standby database

Hi,
We have a production database (1) and we have a physical standby database (2) for it.
Is it possible to forward the archivelogs files from (2) to a logical standby database (3). We want to use the (3) as a UAT - Ad Hoc read only Database.
Thanks.

Hi,
The following Data Guard configurations using cascaded destinations are supported.
A. Primary Database > Physical Standby Database with cascaded destination > Physical Standby Database
B. Primary Database > Physical Standby Database with cascaded destination > Logical Standby Database
A physical standby database can support a maximum of nine (30 as of Version 11.2) remote destinations.
Physical Standby Forwarding Redo to a Logical Standby :
Advantages :
1. Users can connect to Logical Standby database and they can access
2. Instead of querying primary database they can use logical standby database.
3. without any additional overhead on your primary system, and without consuming any additional transatlantic bandwidth.
Disadvantages :
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a. BFILE
b. Collections (including VARRAYS and nested tables)
c. Multimedia data types (including Spatial, Image, and Oracle Text)
d. ROWID, UROWID
e. User-defined types
f. LOBs stored as SecureFiles
g. XMLType stored as Object Relational
h. Binary XML
Thanks
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Not able to get data of primary in standby database (configured dataguard)

Hi all, I configured dataguard in my local system, i ve a few qsns (as i am new, ve patience)
1) scn differs wrt primary in standby (i checked, 1day difference), how to make scn same?
2)i created a table in primary, its not refelecting in standby, (below i ve pasted alertlog entries)
ORA-27041: unable to open file
OSD-04002: unable to open file
O/S-Error: (OS 2) The system cannot find the file specified.
Errors in file d:\oracle11g\app\administrator\diag\rdbms\stand\stand\trace\stand_dbw0_6916.trc:
ORA-01157: cannot identify/lock data file 2 - see DBWR trace file
ORA-01110: data file 2: 'D:\ORACLE11G\APP\ADMINISTRATOR\ORADATA\STAND\SYSAUX01.DBF'
ORA-27041: unable to open file
OSD-04002: unable to open file
O/S-Error: (OS 2) The system cannot find the file specified.
Errors in file d:\oracle11g\app\administrator\diag\rdbms\stand\stand\trace\stand_dbw0_6916.trc:
ORA-01157: cannot identify/lock data file 3 - see DBWR trace file
ORA-01110: data file 3: 'D:\ORACLE11G\APP\ADMINISTRATOR\ORADATA\STAND\UNDOTBS01.DBF'
ORA-27041: unable to open file
OSD-04002: unable to open file
O/S-Error: (OS 2) The system cannot find the file specified.
Errors in file d:\oracle11g\app\administrator\diag\rdbms\stand\stand\trace\stand_dbw0_6916.trc:
ORA-01157: cannot identify/lock data file 4 - see DBWR trace file
ORA-01110: data file 4: 'D:\ORACLE11G\APP\ADMINISTRATOR\ORADATA\STAND\USERS01.DBF'
ORA-27041: unable to open file
OSD-04002: unable to open file
O/S-Error: (OS 2) The system cannot find the file specified.
Errors in file d:\oracle11g\app\administrator\diag\rdbms\stand\stand\trace\stand_dbw0_6916.trc:
ORA-01157: cannot identify/lock data file 5 - see DBWR trace file
ORA-01110: data file 5: 'D:\ORACLE11G\APP\ADMINISTRATOR\ORADATA\STAND\EXAMPLE01.DBF'
ORA-27041: unable to open file
OSD-04002: unable to open file
O/S-Error: (OS 2) The system cannot find the file specified.
Errors in file d:\oracle11g\app\administrator\diag\rdbms\stand\stand\trace\stand_dbw0_6916.trc:
ORA-01157: cannot identify/lock data file 6 - see DBWR trace file
ORA-01110: data file 6: 'D:\ORACLE11G\APP\ADMINISTRATOR\ORADATA\STAND\STREAM_TBS.DBF'
ORA-27041: unable to open file
OSD-04002: unable to open file
O/S-Error: (OS 2) The system cannot find the file specified.
Errors in file d:\oracle11g\app\administrator\diag\rdbms\stand\stand\trace\stand_dbw0_6916.trc:
ORA-01157: cannot identify/lock data file 7 - see DBWR trace file
ORA-01110: data file 7: 'D:\ORACLE11G\APP\ADMINISTRATOR\ORADATA\STAND\DATA01.DBF'
ORA-27041: unable to open file
OSD-04002: unable to open file
O/S-Error: (OS 2) The system cannot find the file specified.
ORA-16004 signalled during: alter database open read only...
3)wen i try to open standby database in read only mode gives below error..how do i solve it?
ERROR at line 1:
ORA-16004: backup database requires recovery
ORA-01157: cannot identify/lock data file 1 - see DBWR trace file
ORA-01110: data file 1:
'D:\ORACLE11G\APP\ADMINISTRATOR\ORADATA\STAND\SYSTEM01.DBF'

971424 wrote:
Hi all, I configured dataguard in my local system, i ve a few qsns (as i am new, ve patience)
1) scn differs wrt primary in standby (i checked, 1day difference), how to make scn same?Please do not use IM language here, instead of "qsns" use questions.
SCN can be differ in standby and it can be behind to primary based on the backup you have restored. Of course by performing recovery you can synchronize standby with primary database. You can use incremental backups for standby using link http://www.oracle-ckpt.com/rman-incremental-backups-to-roll-forward-a-physical-standby-database-2/
2)i created a table in primary, its not refelecting in standby, (below i ve pasted alertlog entries)
ORA-27041: unable to open file
OSD-04002: unable to open file
O/S-Error: (OS 2) The system cannot find the file specified.
Errors in file d:\oracle11g\app\administrator\diag\rdbms\stand\stand\trace\stand_dbw0_6916.trc:
ORA-01157: cannot identify/lock data file 2 - see DBWR trace file
ORA-01110: data file 2: 'D:\ORACLE11G\APP\ADMINISTRATOR\ORADATA\STAND\SYSAUX01.DBF'
ORA-27041: unable to open fileFirst check whether those files are exist in that location or not and if file names are different other than primary then rename file locations. Also check the permissions on the folder/files.

Impact of force_logging on standby database in 10g?

Hi there,
We have a 10.2.0.5 database from which we want to setup a standby database...
We took a hot backup of the primary and send it to the standby server but at that time we realized that force logging is not enabled at the Primary before we took the hot backup!
Can you please suggest what are our options at this stage without losing any data and without a need to redo the hot backup again since it is a huge database?
- If we turn the force_logging on now(on Primary) and then set up the standby using the backup taken prior to force_logging ON - would it cause any issues?
Any help would be greatly appreciated.
Thanks.

No it won't because the hot backup is a copy period. So do it ASAP and the Archive will handle the rest.
So your hot backup is the Standby copy ( exact copy ). Just make sure forced logging is on and the archive with keep the data in sync.
If you delay then you are up the creek without a paddle as NOLOGGING actions are bound to occur and then the Standby data will not match the Primary.
If you have doubts your best option is to roll the standby forward using RMAN Incremental Backups :
http://www.oracle-ckpt.com/?s=incremental&op.x=31&op.y=11
Best Regards
mseberg

MV Logs not getting purged in a Logical Standby Database

We are trying to replicate a few tables in a logical standby database to another database. Both the source ( The Logical Standby) and the target database are in Oracle 11g R1.
The materialized views are refreshed using FAST REFRESH.
The Materialized View Logs created on the source ( the Logical Standby Database) are not getting purged when the MV in the target database is refreshed.
We checked the entries in the following Tables: SYS.SNAP$, SYS.SLOG$, SYS.MLOG$
When a materialized view is created on the target database, a record is not inserted into the SYS.SLOG$ table and it seems like that's why the MV Logs are not getting purged.
Why are we using a Logical Standby Database instead of the Primary ? Because, the load on the Primary Database is too much and the machine doesn't have enough resources to support MV based replication. The CPU usage is 95% all the time. The appplication owner won't allow us to go against the Primary database.
Do we have to do anything different in terms of Configuration/Privileges etc. because we are using a Logical Standby Database as a source ?
Thanks in Advance.

We have a 11g RAC database in solaris OS where there is huge gap in archive log apply.
Thread Last Sequence Received Last Sequence Applied Difference
1 132581 129916 2665
2 108253 106229 2024
3 107452 104975 2477
The MRP0 process seems not to be working also.Almost 7000+ archives lag in standby if compared with primary database.
i suggest you to go with Incremental rollforward backups to make it SYNC, use this below link for step by step procedure.
http://www.oracle-ckpt.com/rman-incremental-backups-to-roll-forward-a-physical-standby-database-2/
Here questions.
1) Whether those archives are transported & just not applied?
2) Is in production do you have archives or backup of archives?
3) What you have found errors in alert log file?
post
SQL> select severity,message,error_code,timestamp from v$dataguard_status where dest_id=2;
4) What errors in primary database alert log file?
Also post
select     ds.dest_id id
,     ad.status
,     ds.database_mode db_mode
,     ad.archiver type
,     ds.recovery_mode
,     ds.protection_mode
,     ds.standby_logfile_count "SRLs"
,     ds.standby_logfile_active active
,     ds.archived_seq#
from     v$archive_dest_status     ds
,     v$archive_dest          ad
where     ds.dest_id = ad.dest_id
and     ad.status != 'INACTIVE'
order by
     ds.dest_id
/Also check errors from standby database.

USD OVERRIDES Not Rolling Forward

We are operating on HFM 9.3.1. When we utilize the USD Override account there is a currency variance which continues in the future months and it does not appear to be rolling over each month automatically. The account in our metadata is not set to Balance Reaccuring but Balance. Can this be changed without creating a problem? How can we insure the overrides only have to be input once.

user11993454 wrote:
Hi
I'm about to use the process defined in note: Steps to perform for Rolling forward a standby database using RMAN incremental backup when primary and standby are in ASM filesystem [ID 836986.1]. I'm on 11.1.0.7.
However, it does not mention the DataGuard broker.
Has anyone performed this process when using the broker.
Does the broker handle it properly?
Does it matter if the broker is up or down during the physical standby recovery or control file replacement?
Does the broker configuration need to be recreated?
Thanks.1) disable the Broker
2) perform Roll forard SCN.
3) enable Broker

How to convert logical standby database to Physical Standby Database

Hi,
Does anyone know how to convert logical standby database(10.2.0.3) to Physical Standby Database(10.2.0.3)? Is this possible? If so,please give me steps for it.
Thanks.
Regards,
RJ.

I don't believe this to be possible. One of the steps invloved in the creation of a logical standby is the following:
ALTER DATABASE OPEN RESETLOGS;
This makes the logical standby a different incarnation of the db from the primary.
A physical standby is a binary copy of a primary db, a logical standby is a completely seperate db that just happens to get sql statements applied to it that are generated from a primary db, but is open read/write.
One avenue, though would be if you had flashback database enabled and you flashed back all the way to when the db was a physical standby and then rolled forward with the archived redo logs.
It's somewhat unlikely you are in that situation, but that is a possibility.
Indeed the 11g snapshot standby does this sort of thing:
http://download.oracle.com/docs/cd/B28359_01/server.111/b28294/manage_ps.htm#sthref740
jason.
http://jarneil.wordpress.com

How to re-synch primary and standby database?

Hello everyone,
Working on 10g R2/windows server 2003, I have configured a physical standby database but, I have an issue, and don't know how to resolve it.
We were making an update that made some DDL and DML on our application, and for security reason we
1. we ensure that primary and standby are in sync
2. We made a cold backup of the primary database
3. We Deferred the redo shipping between primary and standby
4. We applied changes on primary database
But the big issue is that, for any reason my colleague did the following.
a) made above steps 1,2,3,4
b) after the update he kept the resulted archived log files generated during to another location
c) He restore the cold backup before the update(step 2 above)
c) he applied again the update.
Now the issue is
At the first update step(2), the sequence# 553 was applied to the stand by before the update
At the second update step(c) above another sequence# 553 was created but stored localy in the primary database, because the both servers were deverged (step 3 above).
Technically both servers cannot be in sync again,because sequence# 553 at the first update has next_change# 80307804 and sequenc# 553 at the second update has next_change# 80461356.
Question:
How Can I do to rollback the the first sequence# 553 ( before the first update) on the standby database? in order to apply the sequence#553 generated at the second update and then re-sync both servers to roll forward subsequent sequence#? 554,etc...
Thank you for your help

Hello,
I have just tried the FLASHBACK DATABASE TO SCN XXXXXXXX;
but it doesn't work.
Here are steps used from my local dev envirronnment
From the stand by I retrieved the following information.
SEQUENCE# FIRST_CHANGE# NEXT_CHANGE# FIRST_TIM NEXT_TIME
95 707168 707906 15-AUG-08 15-AUG-08
96 707906 708653 15-AUG-08 15-AUG-08
97 708653 709359 15-AUG-08 15-AUG-08
100 710951 711794 15-AUG-08 15-AUG-08
98 709359 710179 15-AUG-08 15-AUG-08
99 710179 710951 15-AUG-08 15-AUG-08
101 711794 712762 15-AUG-08 15-AUG-08
102 712762 713720 15-AUG-08 15-AUG-08
103 713720 714748 15-AUG-08 15-AUG-08
104 714748 715920 15-AUG-08 15-AUG-08
105 715920 739430 15-AUG-08 15-AUG-08
106 739430 800525 15-AUG-08 16-AUG-08
107 800525 875810 16-AUG-08 17-AUG-08
108 875810 916527 17-AUG-08 18-AUG-08
SQL> alter database recover managed standby database cancel;
Database altered.
SQL> alter database activate standby database; --> prepare to open stby in R/W mode
Database altered.
SQL> startup mount force;
ORACLE instance started.
Total System Global Area 612368384 bytes
Fixed Size 1250428 bytes
Variable Size 180358020 bytes
Database Buffers 423624704 bytes
Redo Buffers 7135232 bytes
Database mounted.
SQL> alter database set standby database to maximize performance;
Database altered.
SQL> alter database open;
Database altered.
SQL> startup mount force;
ORACLE instance started.
Total System Global Area 612368384 bytes
Fixed Size 1250428 bytes
Variable Size 180358020 bytes
Database Buffers 423624704 bytes
Redo Buffers 7135232 bytes
Database mounted.
Now I tried to mimic the flashback database as in the production, to bring it back to sequence# 105 above
SQL> flashback database to scn 739430;
flashback database to scn 739430
ERROR at line 1:
ORA-38754: FLASHBACK DATABASE not started; required redo log is not available
ORA-38761: redo log sequence 75 in thread 1, incarnation 2 could not be
accessed
I'm reverted back the physical standby to its function
SQL> alter database convert to physical standby;
Database altered.
SQL> startup mount force;
ORACLE instance started.
Total System Global Area 612368384 bytes
Fixed Size 1250428 bytes
Variable Size 180358020 bytes
Database Buffers 423624704 bytes
Redo Buffers 7135232 bytes
Database mounted.
SQL> alter database recover managed standby database using current logfile disconne
Database altered.
Verifying if the MRP is up and running: YES see below
SQL> select message from v$dataguard_status;
MESSAGE
ARC0: Archival started
ARC1: Archival started
ARC2: Archival started
ARC3: Archival started
ARC3: Becoming the 'no FAL' ARCH
ARC3: 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 starting Real Time Apply
Clearing online redo logfile 1 C:\ORACLE\PRODUCT\10.2.0\ORADATA\ORCL\REDO11.LOG
11 rows selected.
SQL> archive log list;
Database log mode Archive Mode
Automatic archival Enabled
Archive destination C:\local_destination1_orcl
Oldest online log sequence 110
Next log sequence to archive 0
Current log sequence 110
So, how can I reslove this issue? without creating the standby from scratch?
Thanks Again for your help

Reg Max DB roll forward

We have SAP MAX DB database in our environment.
We used the Database Dump file and the Backup log files to build the database and roll forward the logs.
But when we try to do the same activity again using the same Database Dump file and Roll Forward using the same Backup Log Files, we cannot perform the same activity again. When we actually used the Database Dump again, it did not even provide a Option to Roll Forward the logs
Please advice if it is possible to do roll forward

Hello Balaji Rajendran,
1. What is the MAXDB database version?
2. Are you SAP customer?
3. Please review the document u201CSetting Up and Updating Standby Instancesu201D
at MAXDB library http://maxdb.sap.com/doc/7_6/default.htm -> Tutorials -> Tutorial Database Administration
4. There is documentation available in section u201CBackup / Recoveryu201D at
http://wiki.sdn.sap.com/wiki/display/MaxDB/SAP+MaxDB -> SAP MaxDB HowTo
5. Please let us know the database version & what document or SAP note did you follow for the database administration and we could help you further.
Thank you and best regards, Natalia Khlopina

Recreating Physical Standby Database

HI
We have Oracle 11gr2 Primary database 2 node RAC using ASM Shared storage and physical standby database non rac using asm storage and data broker Unfortunately the standby site due to hardware failure the network link was down for a long period and huge log of archive waiting ?
We have required restore database and sync the primary to secondary database using data broker how will do it ?
Any help Highly appreciated
Thanks

Hi,
You can roll-forward you standby using incremental backup from primary .
If you use 'DataGuard Broker', then it should be stopped before starting with step 1) from below article and then started again when all steps finished.
Steps to perform for Rolling forward a standby database using RMAN Incremental Backup. (Doc ID 836986.1)
Thanks,
Renu

RMAN-06053 RMAN-06025 on Standby Database

Dear community,
we have an problem on our standby database (11.2.0.3 64Bit). We use the following RMAN script on the standby side:
connect target *
crosscheck archivelog all;
crosscheck backup;
delete noprompt expired archivelog all;
delete noprompt expired backup;
recover database;
exit;In the alertlog of the standby database we found following:
Thu Sep 20 12:05:33 2012
alter database recover datafile list clear
Completed: alter database recover datafile list clear
alter database recover datafile list
1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20
Completed: alter database recover datafile list
1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20
alter database recover datafile list
241 , 242 , 243 , 244 , 245 , 246 , 247 , 248 , 249 , 250 , 251 , 252 , 253 , 254
Completed: alter database recover datafile list
241 , 242 , 243 , 244 , 245 , 246 , 247 , 248 , 249 , 250 , 251 , 252 , 253 , 254
alter database recover if needed
start until cancel using backup controlfile
Media Recovery Start
started logmerger process
Parallel Media Recovery started with 12 slaves
ORA-279 signalled during: alter database recover if needed
start until cancel using backup controlfile
Thu Sep 20 12:05:58 2012
alter database recover cancel
Media Recovery Canceled
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archived log for thread 2 with sequence 3693 is already on disk as file /u03/fast_recovery_area/DBDB/archivelog/2012_09_20/2_3693_766974880.dbf
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-03002: failure of recover command at 09/20/2012 12:05:52
RMAN-06053: unable to perform media recovery because of missing log
RMAN-06025: no backup of archived log for thread 2 with sequence 2984 and starting SCN of 840244104 found to restore
RMAN-06025: no backup of archived log for thread 2 with sequence 2983 and starting SCN of 840041348 found to restore
RMAN-06025: no backup of archived log for thread 2 with sequence 2982 and starting SCN of 840021178 found to restore
RMAN-06025: no backup of archived log for thread 2 with sequence 2981 and starting SCN of 839974659 found to restoreCan you please help me to understand why protocoll the database these RMAN-Errors and what is false configured?
Best regards

Do you mean the backup on the primary side was not been done?No. Backups created at primary site are not available to the standby of course, so that wont see them.
The standby database is left behind and the required archivelogs for recovery are not available anymore, and it doesnt know anything about the backups.
- you can restore the archivelogs on primary site from backups then let the standby fetch and apply them - can take a lot of time
- you can make the backups made at primary site available to the standby and register the backup pieces - can be problematic with 3rd party backup solutions
- you can create and incremental backup of primary site to roll forward the standby: http://docs.oracle.com/cd/E11882_01/server.112/e10700/rman.htm#CIHIAADC

Oracle 10 upgrade - Primary & standby database

Hi Expert,
I need some information on your project experience. We're currently planning a oracle 10 upgrade. Have a few question:
1. We're planning to upgrade the primary database first and a week later the standby database. Will the archive log which is sent from primary to standby database will still work? Will the recovery still work?
2. Is this the right patch to go 10.2.0.4? I'm currently on 4.7 ext 2
3. Will there be a performance issue known of oracle 10 running on 32-bit machine, since it has the limitation of the memory (3G). Do I need to set AWE option on windows?
Thanks in advance.

Hello Sean,
please let me go more in detail with some of your comments.
> I actually posted my experience with doing a rolling upgrade of a PHYSICAL standby database.
This statement is wrong. You can't do a rolling upgrade with a physical standby database. You have to convert the database to a logical standby database .. and then you can perform a rolling upgrade. But if you have done the conversion, it is not a physical anymore.
This is also described and mentioned in this white paper:
http://www.oracle.com/technology/deploy/availability/pdf/maa_wp_10gr2_rollingupgradebestpractices.pdf
Data Guard SQL Apply (logical standby database) is required in order to perform a database rolling upgrade. You can also do a rolling upgrade when starting with a physical standby by temporarily converting the physical standby to a logical standby. If starting with 11g, see the Rolling Database Upgrades for Physical Standby Databases using Transient Logical Standby 11g paper for details on doing a rolling upgrade when starting with a physical standby. If starting with 10g, see MetaLink note 300479.1.
> It WILL work, and is fairly straight forward.
In this point you are almost correct, because of a standard SAP system is not using the unsupported data types, etc. (afaik)
http://download.oracle.com/docs/cd/B19306_01/server.102/b14239/data_support.htm
To be honest if a sap basis admin asks such a question, i would not recommend to perform an unsupported way, because i am in doubt about his dataguard know how.
Regards
Stefan

AR GL Activity roll-forward.

In the FS which i got some input types for the AR GL Activity roll-forward are mentioned.Wht actually is this AR GL Activity roll-forward..The input types given is
Debit Billings
Misc Debits
Cash Collected
The FS is for a ALV report.
Please help me.
Thanks
Ansari

Hello Balaji Rajendran,
1. What is the MAXDB database version?
2. Are you SAP customer?
3. Please review the document u201CSetting Up and Updating Standby Instancesu201D
at MAXDB library http://maxdb.sap.com/doc/7_6/default.htm -> Tutorials -> Tutorial Database Administration
4. There is documentation available in section u201CBackup / Recoveryu201D at
http://wiki.sdn.sap.com/wiki/display/MaxDB/SAP+MaxDB -> SAP MaxDB HowTo
5. Please let us know the database version & what document or SAP note did you follow for the database administration and we could help you further.
Thank you and best regards, Natalia Khlopina

Rollback ( Tx Recovery) and Roll forward ( cache Recovey)

Hi Guys,
I have a some doubt after Going through the links :
Difference between redo logs and undo tablespace and Oracle DBA ADMIN Guide (E25494-02).
1) Redologs Contain committed and Uncommitted data . Wether they also contain before Image Data ? or its vector that points to the Undo Segments ?
Doc Says : Redo entries record data that you can use to reconstruct all changes made to the database, including the undo segments.
But Above forum Links says that it contains the vector only .
2) Crash of database ( Abort) , how it happens .
I know first it makes the roll forward and then backward. During this Time Undo Tablespace Comes into the picture ? Do the Undo tablespace segments are build from the redo logs. Please Help on this. really get confused
I try to test few scenarios but Not able to conclude ?
1> Make A TXN ( Updated almost 29000 rows )
2) Abort the Database.
3) Change the undo Tablespace Name in init file some dummy .
Database error with the following Error :
SMON: enabling cache recovery
Errors in file d:\install\pracledb\diag\rdbms\dba\dba\trace\dba_ora_5592.trc:
ORA-30012: undo tablespace 'UNDOTBS11' does not exist or of wrong type
Errors in file d:\install\pracledb\diag\rdbms\dba\dba\trace\dba_ora_5592.trc:
ORA-30012: undo tablespace 'UNDOTBS11' does not exist or of wrong type
Error 30012 happened during db open, shutting down database
USER (ospid: 5592): terminating the instance due to error 30012
Second Test :
1) Create a 2nd Undo Tablespace
2) Update the same number of rows .
3) Shut abort in another session.
4) Modify the Pfile with new undotabs2 ( No Spfile)
5) Startup database it started.
Beginning crash recovery of 1 threads
parallel recovery started with 2 processes
Started redo scan
Completed redo scan
read 7971 KB redo, 1272 data blocks need recovery
Started redo application at
Thread 1: logseq 28, block 3
Recovery of Online Redo Log: Thread 1 Group 1 Seq 28 Reading mem 0
Mem# 0: D:\INSTALL\PRACLEDB\ORADATA\DBA\REDO01.LOG
Completed redo application of 6.72MB
Completed crash recovery at
Thread 1: logseq 28, block 15945, scn 1487147
1272 data blocks read, 1272 data blocks written, 7971 redo k-bytes read
Thread 1 advanced to log sequence 29 (thread open)
Thread 1 opened at log sequence 29
Current log# 2 seq# 29 mem# 0: D:\INSTALL\PRACLEDB\ORADATA\DBA\REDO02.LOG
Successful open of redo thread 1
MTTR advisory is disabled because FAST_START_MTTR_TARGET is not set
SMON: enabling cache recovery
Successfully onlined Undo Tablespace 5.
Verifying file header compatibility for 11g tablespace encryption..
Verifying 11g file header compatibility for tablespace encryption completed
Sun Oct 28 18:11:03 2012
SMON: enabling tx recovery
Database Characterset is WE8MSWIN1252
No Resource Manager plan active
SMON: Parallel transaction recovery tried
3) Third Test :
1) Update the same number of rows
2) Change the UNDOTBS to the New UndoTBS
3) rename the Old Datafile
4) db start to fail with error
ALTER DATABASE OPEN
Errors in file d:\install\pracledb\diag\rdbms\dba\dba\trace\dba_dbw0_3960.trc:
ORA-01157: cannot identify/lock data file 10 - see DBWR trace file
ORA-01110: data file 10: 'D:\INSTALL\PRACLEDB\ORADATA\DBA\UNDOTBS2.DBF'
ORA-27041: unable to open file
OSD-04002: unable to open file
O/S-Error: (OS 2) The system cannot find the file specified.
Errors in file d:\install\pracledb\diag\rdbms\dba\dba\trace\dba_ora_4552.trc:
ORA-01157: cannot identify/lock data file 10 - see DBWR trace file
ORA-01110: data file 10: 'D:\INSTALL\PRACLEDB\ORADATA\DBA\UNDOTBS2.DBF'
ORA-1157 signalled during: ALTER DATABASE OPEN...
Sun Oct 28 18:20:04 2012
Checker run found 1 new persistent data failures
Please Help on understand this

Sourabh85 wrote:
Hi Hemant,
Thank you very much , really very helpful. One More Question :
Why Oracle do the Double work ? First Populate the Undo Blocks and then do the roll backward ? Why Not directly recovered from the redo logs for uncommitted txn.Its not the doubling of the work. Oracle updates teh Undo blocks with the old data and since the Undo blocks are also just like the Other data blocks, any changes done to them is also logged as a Change Vector to the redo log files. This means, that there would be an Undo data block change vector recorded in the redo log file before the change vector of the data block which contains the data of your statement. This is what is meant when it is said that the redo log also contains the old images . The idea is to do the recovery, when needed, in the same sequence(based on the SCN's) using everything from the redo log files. This would include the recovery of the Undo datafiles as well in the case they are lost too!
HTH
Aman....

Roll forward standby database

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