Redo and standby

Hi Gurus!
Let's assume this question is for 10.2.0.4 which seems to be the most common edition out there right now despite end of support coming up quicky...
My question is regarding redo and standby. As I understand, the standby will receive redo from the primary (I am not interested in which MAXIMUM mode its in right now) via the Redo Transport Service.
This "redo", this is redo from the redo log file or the redo buffer?
As I understand, the redo logs contain committed and uncommitted changes (LGWR writing out to the discs).
So when we talk about "redo" being sent to the secondary, we are actually considering uncommitted and committed changes??
Could this be clarified please?
Many thanks!
DA

Yes the redo protocol sent to the standby contains change vectors of block changes on behalf of committed & uncommitted transactions.
It is (in case of physical standby) applied in exactly the same way as archivelogs and online logs are applied during recovery. We just do the same block modifications on the standby as on the primary and do not care about commit.
Should we ever need to open the standby, then the before images (undo) of blocks that have been modified on behalf of uncommitted transactions get used to rollback these changes. So in the end, only committed transactions are seen.
Kind regards
Uwe Hesse
http://uhesse.wordpress.com

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Is there a rule, primary and standby database instances have same size redo log files?
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Thank you for your helps.. I found this issue answer:
http://download-west.oracle.com/docs/cd/B19306_01/server.102/b14239/manage_ps.htm#i1010448
Consequently, when you add or drop an online redo log file at the primary site, it is important that you synchronize the changes in the standby database by following these steps:
If Redo Apply is running, you must cancel Redo Apply before you can change the log files.
If the STANDBY_FILE_MANAGEMENT initialization parameter is set to AUTO, change the value to MANUAL.
Add or drop an online redo log file:
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Restore the STANDBY_FILE_MANAGEMENT initialization parameter and the Redo Apply options to their original states.
bye..

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I have read some Oracle documentation for file structure and settings in Data Guard environment. But I still have some doubts. What is the best file structure or settings in Oracle 10.2.0.4 on UNIX for a data guard environment with 4 primary databases and 4 physical standby databases. Based on Oracle documents, there are 3 redo logs. They are: online redo logs, archived redo logs and standby redo logs. The basic settings are:
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FZheng:
Thanks for your input. It is clear that we need 3 type of redo logs on both databases. You answer my question.
But I have another one. In oracle ducument, it says If you have configured a standby redo log on one or more standby databases in the configuration, ensure the size of the current standby redo log file on each standby database exactly matches the size of the current online redo log file on the primary database. It says: At log switch time, if there are no available standby redo log files that match the size of the new current online redo log file on the primary database. The primary database will shut down
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Resizing online and standby redo log in dataguard setup.

In 10gr2 dataguard i would like to increase redo logsize from 50M to 100M.
on primary
standby_file_management=manual
added online redo groups with 100M
log switched
drop old one and readded with 100m
deleted log added in step2.
same for standby redo logs.
On standby
was able to resize standby redo logs.
but cannot resize online redologs status is clearing or clearing_current.
please comment. thanks.

I assume you just had to wait until the Primary switched out of that online log so it became inactive at the standby as well? We track where the Primary is by marking the online redo log files at the standby as clearing_current so you can tell where the primary was at any given moment.
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Larry

Dataguard lost both Primary redo log and standby redo log files

Hi,
I am new to data guard, i came acorss a scenario where we loose both primary redo log file and standby redo log files.
Can someone please help me understand how to recover from this situation.
Thanks!

>loose both primary redo log file and standby redo log files
We have to be very clear.
There are (set A) online redo log files and (set B) standby redo log files at (location 1) Primary and (location 2) Standby.
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Hello everyone,
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Hello,
I have just tried the FLASHBACK DATABASE TO SCN XXXXXXXX;
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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
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Database altered.
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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.
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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.
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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
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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.
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Database altered.
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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.
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Database log mode Archive Mode
Automatic archival Enabled
Archive destination C:\local_destination1_orcl
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Next log sequence to archive 0
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Hello All,
I am using Oracle 11gR2.
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Hi,
Since You are using 2 node RAc as primary, so for switchover operation you need to shutdown
one database instance( Suppose instance 2).
Suppose your node1:
hostname is dcpdb1
and node 2:
hostname is dcpdb2
and standby hostname is drpdb1
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How to Switchover from Primary to Standby Database?
Process:
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*########### Login drpdb1 as Oracle user #########*
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FROM v$archived_log
ORDER BY next_time ;
*########### Login dcpdb2 as Oracle user #########*
SQL> SELECT sequence#, first_time, next_time
FROM v$archived_log
ORDER BY next_time ;
SQL> ALTER SYSTEM SWITCH LOGFILE;
Check the new archived redo log has arrived at the standby server and been applied.
*########### Login drpdb1 as Oracle user #########*
SQL> SELECT sequence#, first_time, next_time, applied
FROM v$archived_log
ORDER BY next_time ;
*########### Login dcpdb1 as Oracle user #########*
SQL> SELECT SWITCHOVER_STATUS FROM V$DATABASE;
SWITCHOVER_STATUS
TO STANDBY
*########### Login dcpdb2 as Oracle user #########*
SQL> SELECT SWITCHOVER_STATUS FROM V$DATABASE;
SWITCHOVER_STATUS
TO STANDBY
*########### Login drpdb1 as Oracle user #########*
SQL> SELECT SWITCHOVER_STATUS FROM V$DATABASE;
SWITCHOVER_STATUS
NOT ALLOWED
*########### Login dcpdb2 as Oracle user #########*
SQL> shutdown immediate
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SQL>
*########### Login dcpdb1 as Oracle user #########*
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Database altered.
SQL>
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SQL>
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ORACLE instance started.
Total System Global Area 1.5400E+10 bytes
Fixed Size 2184872 bytes
Variable Size 7751076184 bytes
Database Buffers 7616856064 bytes
Redo Buffers 29409280 bytes
Database mounted.
SQL> SELECT SWITCHOVER_STATUS FROM V$DATABASE;
SWITCHOVER_STATUS
TO PRIMARY
SQL>
*########### Login drpdb1 as Oracle user #########*
SQL> SELECT SWITCHOVER_STATUS FROM V$DATABASE;
SWITCHOVER_STATUS
SESSIONS ACTIVE
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Database altered.
SQL> shutdown immediate
ORA-01109: database not open
Database dismounted.
ORACLE instance shut down.
SQL>
SQL> startup
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Total System Global Area 1.5400E+10 bytes
Fixed Size 2184872 bytes
Variable Size 7717521752 bytes
Database Buffers 7650410496 bytes
Redo Buffers 29409280 bytes
Database mounted.
Database opened.
*########### Login dcpdb1 as Oracle user #########*
SQL> alter database open read only;
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SQL> alter database recover managed standby database using current logfile disconnect;
Database altered.
*########### Login dcpdb2 as Oracle user #########*
SQL> startup mount
ORACLE instance started.
Total System Global Area 1.5400E+10 bytes
Fixed Size 2184872 bytes
Variable Size 7751076184 bytes
Database Buffers 7616856064 bytes
Redo Buffers 29409280 bytes
Database mounted.
SQL> alter database open read only;
Database altered.
SQL> alter database recover managed standby database using current logfile disconnect;
Database altered.
SQL> SELECT SWITCHOVER_STATUS FROM V$DATABASE;
SWITCHOVER_STATUS
NOT ALLOWED
SQL>
*########### Login drpdb1 as Oracle user #########*
SQL> SELECT SWITCHOVER_STATUS FROM V$DATABASE;
SWITCHOVER_STATUS
TO STANDBY
*########### Login dcpdb1 as Oracle user #########*
SQL> SELECT SWITCHOVER_STATUS FROM V$DATABASE;
SWITCHOVER_STATUS
NOT ALLOWED
SQL>
*########### Login dcpdb2 as Oracle user #########*
SQL> SELECT SWITCHOVER_STATUS FROM V$DATABASE;
SWITCHOVER_STATUS
NOT ALLOWED
SQL>
*####################### Finish SwitchOver ########################*
Check
*########### Login drpdb1 as Oracle user #########*
SQL> alter system switch logfile;
SQL>
SELECT sequence#, first_time, next_time
FROM v$archived_log
ORDER BY sequence#;
SQL> archive log list
*########### Login dcpdb1 as Oracle user #########*
SQL>
SELECT sequence#, first_time, next_time, applied
FROM v$archived_log
ORDER BY sequence#;
SQL> archive log list
*########### Login dcpdb2 as Oracle user #########*
SQL>
SELECT sequence#, first_time, next_time, applied
FROM v$archived_log
ORDER BY sequence#;
SQL> archive log list
Thanks
Solaiman
Edited by: 876149 on Apr 12, 2013 11:51 AM

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