Standby Database (Archive Log Mode)

I'm going to be setting up a standby database.
I understand that the primary database must be in archive log mode.
Is there any reason for the standby database to be in archivelog mode?

Since your primary Db is in archive log mode, so will be your standby, when it is made primary.But. you can use STANDBY REDO LOGS from 9i version, where these Standby Redo Logs then store the information received from the Primary Database.
As per metalink:-
>
Standby Redo Logs are only supported for the Physical Standby Database in Oracle 9i and as well for Logical Standby Databases in 10g. Standby Redo Logs are only used if you have the LGWR activated for archival to the Remote Standby Database.If you have Standby Redo Logs, the RFS process will write into the Standby RedoLog as mentioned above and when a log switch occurs, the Archiver Process of the Standby Database will archive this Standby Redo Log to an Archived Redo Log, while the MRP process applies the information to the Standby Database. In a Failover situation, you will also have access to the information already written in the Standby Redo Logs, so the information will not be lost.
>
Check metalink Doc ID: Note:219344.1
Regards,
Anand

Similar Messages

Standby database archive log apply in production server.

Dear All,
How I apply standby database archive log apply in production server.
Please help me.
Thanks,
Manas

How can i use standby database as primary for that 48 hour ?Perform a switchover (role transitions).
First check if the standby is in sync with the primary database.
Primary database:
sql>select max(sequence#) from v$archived_log; ---> Value AStandby database:
sql>select max(sequence#) from v$archived_log where applied='YES'; -----> Value BCheck if Value B is same as Value A.
If the standby is in sycn with the primary database, then perform the switchover operation (refer the below link)
http://www.articles.freemegazone.com/oracle-switchover-physical-standby-database.php
http://docs.oracle.com/cd/B19306_01/server.102/b14230/sofo.htm
http://www.oracle-base.com/articles/9i/DataGuard.php#DatabaseSwitchover
manas
Handle: manas
Email: [email protected]
Status Level: Newbie
Registered: Jan 24, 2012
Total Posts: 10
Total Questions: 3 (3 unresolved)
Name Manas
Location kolkata Mark your questions as answered if you feel that you have got better answers rather than building up a heap of unanswered questions.

Physical standby in archive log mode

HI ,
Our phyiscal standby database is running in archive log mode,
1.Is it manadatory to have it in archive log mode ?
2.As it is in archive log mode , does it produce any archivelog ?

Hello again;
The Standby is a clone of the Primary. I assume we are talking Physical Standby.
Why does it need to produce archive in standby role?Its does not produce archive in the Standby role. I have seen a Standby produce a log now and then, but not log after log like a primary. A Standby database does not write Redo or use Redo logs, it uses Standby Redo logs. Since Redo logs are not used, archive is not written.
Why it is manadatory to enable archive log in standby?Smart design I'm thinking. Why would Oracle make us add this complex step to a failover/switchover?
Keep it simple if possible.
Data Guard Concepts and Administration 11g Release 2 (11.2) E10700-02
Database Concepts
http://docs.oracle.com/cd/E11882_01/server.112/e25789/process.htm
Best Regards
mseberg

SGEN & database archive log mode

Hi Experts,
To apply ABAP support packs, I disabled archive log mode of databse and successfully applied support packs.
As post processing, I kicked off SGEN.
Is it required that database be in "NO Archive log mode" while SGEN is running or can I enable it.
Thanks
Putla

Not sure what database it is.. but if it is ORACLE...
$sqlplus / as sysdba
SQL> shutdown immediate;
SQL> startup mount;
SQL> Alter database noarchivelog;
SQL> alter database open;
After the completion of SGEN.....
$sqlplus / as sysdba
SQL> shutdown immediate;
SQL> alter database mount;
SQL> alter database archivelog;
SQL> alter database open;

Standby database Archive log destination confusion

Hi All,
I need your help here..
This is the first time that this situation is arising. We had sync issues in the oracle 10g standby database prior to this archive log destination confusion.So we rebuilt the standby to overcome this sync issue. But ever since then the archive logs in the standby database are moving to two different locations.
The spfile entries are provided below:
*.log_archive_dest_1='LOCATION=/m99/oradata/MARDB/archive/'
*.standby_archive_dest='/m99/oradata/MARDB/standby'
Prior to rebuilding the standby databases the archive logs were moving to /m99/oradata/MARDB/archive/ location which is the correct location. But now the archive logs are moving to both /m99/oradata/MARDB/archive/ and /m99/oradata/MARDB/standby location, with the majority of them moving to /m99/oradata/MARDB/standby location. This is pretty unusual.
The archives in the production are moving to /m99/oradata/MARDB/archive/ location itself.
Could you kindly help me overcome this issue.
Regards,
Dan

Hi Anurag,
Thank you for update.
Prior to rebuilding the standby database the standby_archive_dest was set as it is. No modifications were made to the archive destination locations.
The primary and standby databases are on different servers and dataguard is used to transfer the files.
I wanted to highlight one more point here, The archive locations are similar to the ones i mentioned for the other stndby databases. But the archive logs are moving only to /archive location and not to the /standby location.

Is the only way to import large amount of data and database objects into a primary database is to shutdown the standby, turn off archive log mode, do the import, then rebuild the standby?

I have a primary database that need to import large amount of data and database objects. 1.) Do I shutdown the standby? 2.) Turn off archive log mode? 3.) Perform the import? 4.) Rebuild the standby? or is there a better way or best practice?

Instead of rebuilding the (whole) standby, you take an incremental (from SCN) backup from the Primary and restore it on the Standby. That way, if, for example
a. Only two out of 12 tablespaces are affected by the import, the incremental backup would effectively be only the blocks changed in those two tablespaces (and some other changes in system and undo) {provided that there are no other changes in the other ten tablespaces}
b. if the size of the import is only 15% of the database, the incremental backup to restore to the standby is small
Hemant K Chitale

Archive log mode in 3 node rac database

Sir I am using oracle 10.2.0.1 and created 3 node cluster setup on.OS i am using linux 4
I am too much confuse in setting up this cluster in archive log mode bec why we need to false cluater_database parameter to setup cluster in archive log mode.
I have search lot of documents but all are saying we not need setting this parameter flase perior to 10.2.But what is the actual concept behind setting this parameter to false in early release and why we need not to set it false.Please help me.
I know how to set up in archive log mode but this parameter create confusion.
Thanks sir in advance

I also dont't know all the details about this but I'll try to explain what I know. Setting cluster_database to false in a rac environment is usually done when you need to mount the database from one instance exclusively. This is still needed when you upgrade the catalog, for example during release update (from 10.2.0.1 to 10.2.0.4 for example). Now with switching archivelog mode someone at oracle must have discovered that it is sufficient when the database is mounted by only one instance and you can actually save one step.
As I (and propably most of you) don't switch archiving on or off on a daily basis, I don't worry about this a lot, simply turn this on when I create a new database and then leave it on forever.
Bjoern

When creating a tablespace why should we enable LOGGING when a database is already on ARCHIVE LOG mode

Question :
When creating a tablespace why should we enable LOGGING when a database is already on ARCHIVE LOG mode ?
Example:
Create Tablespace
CREATE SMALLFILE TABLESPACE "TEST_DATA"
LOGGING
DATAFILE '+DG_TEST_DATA_01(DATAFILE)' SIZE 10G
AUTOEXTEND ON NEXT 500K MAXSIZE 31000M
EXTENT MANAGEMENT LOCAL
SEGMENT SPACE MANAGEMENT AUTO;
LOGGING: Generate redo logs for creation of tables, indexes and partitions, and for subsequent inserts. Recoverable
Are they not logged and not recoverable if we do not enable LOGGING? What is that ARCHIVELOG mode does?

What is that ARCHIVELOG Mode Does?
Whenever your database is in archive log mode , Oracle will backup the redo log files in the form of Archives so that we can recover the database to the consistent state in case of any failure.
Archive logging is essential for production databases where the loss of a transaction might be fatal.
Why Logging?
Logging is safest method to ensure that all the changes made at the tablespace will be captured and available for recovery in the redo logs.
It is just the level at which we defines:
Force Logging at DB level
Logging at Tablespace Level
Logging at schema Level
Before the existence of FORCE LOGGING, Oracle provided logging and nologging options. These two options have higher precedence at the schema object level than the tablespace level; therefore, it was possible to override the logging settings at the tablespace level with nologging setting at schema object level.

Clone database with no archive log mode and downtime with new file structure

We need to clone database with following business requirements :
No downtime at all can be afford
databases are in no archive log mode
data-file locations need to be change to new mount points while cloning for space management factor
Please suggest the best possible methods for same ?

Can you post your version of oracle in 4 digits and OS for better understandig
I dont think you can move the No Archive database to a new location without shutting down.
You just want to move them to the new mount points is it?
1. How big are your datafiles are?
2.How do you backup this DB?
When you move the datafilles then it becomes inconsistent and you need redo logs and probably archive logs to be there to make the file consistent or else it would be prompting for recovery. The chances are your redolog will be overwritten and hence you wont be able to recover.
You need downtime.

Switching database to archive log mode

1.When I switch the database to archive log mode,
I have to do full offline(consistent) backup.
2.When the database is working in archive log mode
I can do inconsistent(online) backups.
Why is there consistent backup needed after swiching
to archive log mode, is there not inconsistent backup
enough after switching (the databease operates
in archive log mode and as in point 2 I can make inconsistent backups).

Hello,
Oracle recommands to do offline backup after switching to archivelog as an immediate crash-recovery procedure. Look at the following example:
1/ You switch your base to archivelog.
2/ Work is started right away.
3/ Your DB crashes => You got your archived redo logs, but none of the other files.
Now, let's put a
1b/ Backup (offline) your database.
Now, in 3, youg got everything you need to restore the base, because 3 can happen WHILE your are ONLINE Backing up the base.
That's the point.
Regards,
Yoann.

Changing archive log mode without shutting down database

Hi all,
Is there any way to set the database to archive log mode before shutting down the database and when the database shuts and starts, the database should be automatically in archive log mode?
because we can not shutdown the database in weekdays and we have system reboot on weekend and we are not here on that day. So is there a way to set the database in archive log at the memory level so that when the database reboots, it should automatically start in archive log mode.
my environment is windows server 2008 R2 with oracle 11.2.0.3
Thanks in advance.
Edited by: 931643 on Dec 5, 2012 10:37 AM

931643 wrote:
thank you for the reply Max Seleznev,
First I thought of writing script in order to include in that process. But we can not run any commands in the sqlplus using the windows jobs. for eg:
you can write a batch file as below:
cd \
sqlplus / as sysdba
select name,open_mode from v$database;
when you run this, it will open until sqlplus prompt but then will not execute the query.
What did you expect? Well, actually, I know what you expected. But think about it for a second. You have a batch file with the mentioned three lines. How does that batch file get processed .. what is happening when it is being processed?
It is not being processed by sqlplus, it is being processed by the windows command processor. Just like the cmd.exe. Each line is read by the command processor and executed accordingly. So ....
cd \the command processor calls 'cd' , and passes the value '\' to do with as it sees fit. 'cd' then changes the current directory of the session to whatever is indicated by the passed parameter. in this case, that value is '\' , so the resulting current directory is the base (root, in *nix terms) of the current drive. When 'cd' has finished, it returns control to the command processor, who then reads the next line ....
sqlplus / as sysdbathe command processor calls sqlplus.exe and passes it the command line parms '/ as sysdba' to do with as it (sqlplus) sees fit. sqlplus does whatever it does with what it has been given In this case it tries to connect to whatever local database is indicated by the value of ORACLE_SID, then waits for more input. Whenever sqlplus exits (how does it know to exit?) it returns control to the command processor, who then reads the next line ....
select name,open_mode from v$database;The command processor will read this line and attempt to find an executable file named 'select' and pass it the rest of the command line 'name,open_mode from v$database;'
Hmm, what do you suppose will happen with that operation?
that is the reason I am figuring out whether there is an alternate way.yes but you have to use the proper technique. And since you are building this into a production stop/start without testing the actual stop/start commands ... what do you suppose will be the outcome if something goes wrong?
After hours and weekend work is one reason DBA's make more money than developers.
>
Thanks

For streams , database in Archive log mode or non archive log mode?

Hello ,
I have a basic question,
To set up oracle streams, what should be the the database mode (archive log or non archive log mode)?
Thanks in advance,
Raj

It needs to be in archive log mode..thts the place frm where it captures the necessary information....
Kapil

Running a physical standby database in noarchivelog mode

Primary Database: 2 node rac cluster, 11.2.0.2 GI and RDBMS
Standby Database: single instance 11.2.0.2
OS: AIX 7.1
Hello,
I'm in the process of implementing a data guard standby system. To make this system simpler to admin, I want to run the standby database in NOARCHIVELOG mode. This standby is used only as a mirror of production (to be copied to a 3rd site for separate user activity) and will never be switched to active mode. Maintaining another set of archive logs seems to be redundant to me and another point of failure, so I want to disable archiving. I wanted to ask if any of the DG experts on the forums have ever had experience with this? Does anyone know if this is recommended? I've searched the Oracle Data guard documentation online... it says that the primary obviously needs to be in archive mode, but I'm not seeing anything specific about the standby. Please let me know if anyone has experience with this.
Thanks

Hello again;
If this is the case, then I have nothing to worry about here. Does that sound right to you?Yes.
For this :
b) monthly, shutdown this system and copy it to a 3rd site to host a separate set of business activityI would consider RMAN Duplicate in which case you may avoid the shutdown.
And for this :
resync the "mirror" with productionAll you have to do if DEFER the primary to the standby, then ENABLE and Data Guard will catch up.
--- Will post a detailed example here in a moment.
Right at the first of the year they wanted to work on our Primary server room ( Power ). What I did was switchover to the Standby but I kept log_archive_dest_state_2 on the new primary set to DEFER. Then I shutdown
all the databases at the Primary site. At the end of work two days later I started the databases at the Primary site in standby mode. Switched log_archive_dest_state_2 to ENABLE. When the databases were back in SYNC
I did another switchover and it was done. I used TAF and none of the users even noticed.
Best Regards
mseberg

Starting Physically Standby Database in Mount Mode

Hi All
I have configured Data Guard using Oracle 10g 10.2.0.4.0 (64 bits) on Windows 2008 Server (64 bits) Release 2 Enterprise.
Data guard configuration was OK as the message from "Enable Configuration DG1" was "SUCCESS" for both
Primary and Standby Database. I have also set both Databases and TNS to start Automatically whenever Windows Starts.
The Problem is as long as the Standby Server is running, there is No issue.
But when we Restarts the Backup Server, Physically Standby Database is Started and TNS is also Started,
but Archives are not received until I physically do the following steps so that it can received the Archives.
SQL> startup nomount;
SQL> alter database mount standby database;
SQL> alter database recover managed standby database disconnect from session;
Is there a way to start Physically Standby Database in Mount mode when windows started.
Regards
Thunder2777

Hi Mihael
I have created 2 files. 1 Bat file 2nd sql file which contains all commands as written above.
When I execute start.bat file
1. set ORACLE_HOME=C:\oracle\product\10.2.0\db_1
2. set ORACLE_SID=UMISBK
3. sqlplus / [email protected]
1 & 2 executed properly. At 3 it just display SQL help for login as shown below.
SQL*Plus: Release 10.2.0.4.0 - Production
Copyright (c) 1982, 2007, Oracle. All Rights Reserved.
Usage 1: sqlplus -H | -V
    -H             Displays the SQL*Plus version and the usage help.
    -V             Displays the SQL*Plus version.
Usage 2: sqlplus [ [<option>] [<logon>] [<start>] ]
<option> is: [-C <version>] [-L] [-M "<options>"] [-R <level>] [-S]
It Did Not execute start.sql file to excute sql commands.
Regards
Thunder2777

Question about import in archive log mode

Hello.
I am a developer, I have ordered to write a script that makes the import of a schema of a database (release 9.2.0.7). That import will be done once a day. I have seen that in my development environment the import creates 54 archivers files (10M aprox. each), that means more that half a Gb a day, it seems too much to me.
I cannot see why all those archivers can be useful. Would a good way of proceeding the following?
1. Forcing an archiver just before the import (I do not know how to do that) so that a backup could be done to the state before the import.
2. Disabling archive log mode during the import and enabling it just after the import (I do not know how to do that).
3. Forcing a new archiver just after the import (I do not know how to do that).
Thanks in advance.

540M is not that much.
One would question why you need to import every day,
there must be better ways to do this.
The three steps you propose look like an awful
scenario, as it would require the database to switch
from archivelog to noarchivelog and vice versa.
This would require the database to close twice a
day.
The scenario is also incomplete as one would need to
take a backup after the import
If you can convince your DBA to close the database
twice a day, he should write the script, which he can
easily derive from the docs.
But likely he will visit Billy Verreynne to borrow
his lead pipe, and rightly so ;)
Sybrand Bakker
Senior Oracle DBAThanks for the answer.
A few things:
- Sorry for my ignorance, I have no experience in database backups, I do not understand why I need to backup just after the import.
- That database is not critical, it is just for a team who will test on that database several applications, so the database will only need to be open during the office schedule.
- I have no dba. The client has a dba for several databases but I have no contact with him/her nor my boss has.

Standby Database (Archive Log Mode)

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