Standby log files in Oracle Dataguard

Hi,
What is the difference between standby log files and online redo log files in a Dataguard environment?
What is the use of standby log files?
Thanks,
Charith.

You're probably familiar with the Online Redo Logs (ORLs). Transaction changes are written from the Log Buffer to the ORLs by the LGWR process.
If you are setting up a physical standby, then you will want to create Standby Redo Logs (SRLs) in the standby database. When SRL's are in place, a process called LNS will transport redo from the Log Buffer of the primary to the RFS process on the standby which will write the redo to the SRLs. If the SRL does not exist, RFS can't do this. The biggest benefit of using SRLs is that you will experience much less data loss, even in MAX PERFORMANCE mode. Redo will constantly be shipped. You won't have to wait for ARCH to transport a full archived redo log.
Cheers,
Brian

Similar Messages

Standby log files

I want to convert our old script based primary /standby database into a dataguard config using the LGWR as log transport.
I already have old log files on the standby database, but the data in them is from 2004. Not entirely interesting since the database gets recovered from the arch log files every night.
Point is, can I use these as standby log files, or do I have to (somehow) drop these and re-create new standby logfiles. I cant drop them anyway since when I try, I get "ORA-01624, log 1 needed for crash recovery". (Like h*ll, since the data is older than Noah).
Will these just get re-written?
null
null

Note:219344.1 This note from metalink gives "Usage, Benefits and Limitations of Standby Redo Logs (SRL)".
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.
The great Advantage of Standby Redo Logs is that every Entry written into
the Online RedoLogs of the Primary Database is transfered to the Standby
Site and written into the Standby Redo Logs at the same time; threfore, you
reduce the probability of Data Loss on the Standby Database.

I'm a bit confused about standby log files

Hi all,
I'm a bit confused about something and wondering if someone can explain.
I have a Primary database that ships logs to a Logical Standby database.
Everything appears to be working properly. If I check the v$archived_log table in the Primary and compare it to the dba_logstdby_log view in the Logical Standby, I'm seeing that logs are being applied.
On the logical standby, I have the following configured for log_archive_dest_n parameters:
*.log_archive_dest_1='LOCATION=/u01/oracle/archivedlogs/ORADB1
VALID_FOR=(ALL_LOGFILES,ALL_ROLES) DB_UNIQUE_NAME=PNX8A_GMD'
*.log_archive_dest_2='LOCATION=/u02/oracle/archivedlogs/ORADB1
VALID_FOR=(ALL_LOGFILES,ALL_ROLES) DB_UNIQUE_NAME=PNX8A_GMD'
*.log_archive_dest_3='LOCATION=/u03/oracle/archivedlogs/ORADB1
VALID_FOR=(ALL_LOGFILES,ALL_ROLES) DB_UNIQUE_NAME=PNX8A_GMD'
*.log_archive_dest_4='SERVICE=PNX8A_WDC ASYNC VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=PNX8A_WDC'
*.log_archive_dest_5='LOCATION=/u01/oracle/standbylogs/ORADB1
VALID_FOR=(STANDBY_LOGFILES,STANDBY_ROLE) DB_UNIQUE_NAME=PNX8A_GMD'
*.log_archive_dest_6='LOCATION=/u02/oracle/standbylogs/ORADB1
VALID_FOR=(STANDBY_LOGFILES,STANDBY_ROLE) DB_UNIQUE_NAME=PNX8A_GMD'
*.log_archive_dest_7='LOCATION=/u03/oracle/standbylogs/ORADB1
VALID_FOR=(STANDBY_LOGFILES,STANDBY_ROLE) DB_UNIQUE_NAME=PNX8A_GMD'
Here is my confusion now. Before converting from a Physical standby database to a Logical Standby database, I was under the impression that I needed the standby logs (i.e. log_archive_dest_5, 6 and 7 above) because a Physical Standby database would receive the redo from the primary and write it into the standby logs before applying the redo in the standby logs to the Physical standby database.
I've now converted to a Logical Standby database. What's happening is that the standby logs are accumulating in the directory pointed to by log_archive_dest_6 above (/u02/oracle/standbylogs/ORADB1). They do not appear to be getting cleaned up by the database.
In the Logical Standby database I do have STANDBY_FILE_MANAGEMENT parameter set to AUTO. Can anyone explain to me why standby log files would continue to accumulate and how I can get the Logical Standby database to remove them after they are no longer needed on the LSB db?
Thanks in advance.
John S

JSebastian wrote:
I assume you mean in your question, why on the standby database I am using three standby log locations (i.e. log_archive_dest_5, 6, and 7)?
If that is your question, my answer is that I just figured more than one location would be safer but I could be wrong about this. Can you tell me if only one location should be sufficient for the standby logs? The more I think of this, that is probably correct because I assume that Log Transport services will re-request the log from the Primary database if there is some kind of error at the standby location with the standby log. Is this correct?As simple configure as below. Why more multiple destinations for standby?
check notes Step by Step Guide on How to Create Logical Standby [ID 738643.1]
>
LOG_ARCHIVE_DEST_1='LOCATION=/arch1/boston VALID_FOR=(ONLINE_LOGFILES,ALL_ROLES) DB_UNIQUE_NAME=boston'
LOG_ARCHIVE_DEST_2='SERVICE=chicago LGWR ASYNC VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=chicago'
LOG_ARCHIVE_DEST_3='LOCATION=/arch2/boston/ VALID_FOR=(STANDBY_LOGFILES,STANDBY_ROLE) DB_UNIQUE_NAME=boston'
The following table describes the archival processing defined by the initialization parameters shown in Example 4-2.
     When the Boston Database Is Running in the Primary Role      When the Boston Database Is Running in the Logical Standby Role
LOG_ARCHIVE_DEST_1      Directs archival of redo data generated by the primary database from the local online redo log files to the local archived redo log files in /arch1/boston/.      Directs archival of redo data generated by the logical standby database from the local online redo log files to the local archived redo log files in /arch1/boston/.
LOG_ARCHIVE_DEST_2      Directs transmission of redo data to the remote logical standby database chicago.      Is ignored; LOG_ARCHIVE_DEST_2 is valid only when boston is running in the primary role.
LOG_ARCHIVE_DEST_3      Is ignored; LOG_ARCHIVE_DEST_3 is valid only when boston is running in the standby role.      Directs archival of redo data received from the primary database to the local archived redo log files in /arch2/boston/.
>
Source:-
http://docs.oracle.com/cd/B19306_01/server.102/b14239/create_ls.htm

[SOLVED] Writting to log file on Oracle AS in ADF BC

Hi!
I'm trying to write some information to any of the log files on Oracle Application Server but can't seem to get it working.
I have a http servlet class in which I try to log records like this:
Logger loLogger = Logger.getAnonymousLogger();
loLogger.info("HttpServlet: doGet start!");This code displays
1.4.2008 9:44:02 package.HttpServlet doGet
INFO: HttpServlet: doGet start!
in JDeveloper output window, but after deployment to AS it is not written to any of the files. I do not use a custom logger or log files in my application so my question is: how can I write information to any of the log files on AS (for example logs in <ORACLE_HOME>\opmn\logs folder or in log.xml file in oc4j folder of j2ee home log)?
I've been reading about j2ee logging but as I said, can't get it to work. Are there any ADF classes to do this?
Thanks,
regards!

Hi!
Thank you both for your effort. Both ways work now, I messed something up at the beginning.
Logger loLogger = Logger.getAnonymousLogger();
loLogger.info("method start!");writes to 'default_group~home~default_group~1.log' file in opmn/logs directory, while
ADFLogger loADFLogger = ADFLogger.createADFLogger("oracle");
loADFLogger.log(ADFLogger.NOTIFICATION, "method start!");writes to 'log.xml' in j2ee\home\log\home_default_group_1\oc4j directory.
Now I just have to decide which is better for me ;).
BB

Log File in oracle network log directory,

Hello,
in the oracle\network\log directory there we can find the file [SIDNAME].log.
I think only in case for network troubles, oracle will log some informations in this log file.
For what is this file needed and can I delete this file?
Thanks for your help.

thanks for feedback...
the input of the file is like the following:
11-JUN-2010 10:23:51 * service_register * WMS * 0
11-JUN-2010 10:24:03 * service_update * WMS * 0
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11-JUN-2010 10:24:27 * service_update * WMS * 0
11-JUN-2010 10:24:30 * service_update * WMS * 0
11-JUN-2010 10:25:05 * ping * 0
11-JUN-2010 10:25:05 * (CONNECT_DATA=(CID=(PROGRAM=)(HOST=)(USER=SYSTEM))(COMMAND=status)(ARGUMENTS=64)(SERVICE=(ADDRESS=(PROTOCOL=TCP)(HOST=PCWI)(PORT=1521)))(VERSION=169869568)) * status * 0
11-JUN-2010 10:25:16 * (CONNECT_DATA=(SID=WMS)(CID=(PROGRAM=C:\Programme\Oracle\DB10g\perl\5.8.3\bin\MSWin32-x86-multi-thread\perl.exe)(HOST=PCWI)(USER=SYSTEM))(SERVER=dedicated)) * (ADDRESS=(PROTOCOL=tcp)(HOST=192.168.14.194)(PORT=2538)) * establish * WMS * 0
11-JUN-2010 10:25:51 * (CONNECT_DATA=(SID=WMS)(CID=(PROGRAM=C:\Programme\Oracle\DB10g\perl\5.8.3\bin\MSWin32-x86-multi-thread\perl.exe)(HOST=PCWI)(USER=SYSTEM))(SERVER=dedicated)) * (ADDRESS=(PROTOCOL=tcp)(HOST=192.168.14.194)(PORT=2542)) * establish * WMS * 0
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can I deactivate this traces?
thanks for feedback

Log file in Oracle

Hi All,
As like SAP log files stored in \usr\sap\<SID>\DVEBMGS00\log if I am wrong correct it.And we can view system log through sm21
I want to know the log file path for Oracle.(Oracle log file path ,SAP)
Also I want the Oracle file system details like /oracle/<Ora SID>/......
oraarch file used for ..
orainit file user for ...
like way all oracle file system.
Thanks,
Anil

> As like SAP log files stored in \usr\sap\<SID>\DVEBMGS00\log if I am wrong correct it.And we can view system log through sm21
That is the system log. Other logs are stored in the database (transaction SLG1).
> I want to know the log file path for Oracle.(Oracle log file path ,SAP)
> Also I want the Oracle file system details like /oracle/<Ora SID>/......
>
> oraarch file used for ..
> orainit file user for ...
I suggest you read the installation guides as well as getting an Oracle class or use the 2 day DBA course at
http://www.oracle.com/pls/db102/homepage?remark=tahiti
Markus

LDB files or log files in ORACLE database ?

Hi Experts,
Like LDB files in MIcrosoft Access do we have any sort of files in ORACLE which records the transactions and updates done in a particular database.
Pls help me if you have any idea on this.
Thanks in advance.

If you are comparing Access with Oracle, then you are in for many shocks and surprises. In Oracle we have a database, in which there are logiical things called as tablespaces which have data files, a physical file at operating system level, which store data, and then transactions are also protected by the redo logs and for the old image we have undo tablespaces and so on...
regards

Can not remove standby log file, please help

Hi,
My v$logfile
GROUP# STATUS TYPE MEMBER
IS_RECOVERY_DEST_FILE
3 ONLINE /u01/app/oracle/oradata/orcl/redo03.log
NO
2 ONLINE /u01/app/oracle/oradata/orcl/redo02.log
NO
1 ONLINE /u01/app/oracle/oradata/orcl/redo01.log
NO
GROUP# STATUS TYPE MEMBER
IS_RECOVERY_DEST_FILE
4 STANDBY /u01/app/oracle/oradata/orcl/stdlog01.log
NO
5 STANDBY /u01/app/oracle/oradata/orcl/stdlog02.log
NO
And when i clear standby log 5
SQL> alter database clear logfile group 5;
alter database clear logfile group 5
ERROR at line 1:
ORA-00600: internal error code, arguments: [2130], [0], [8], [2], [], [], [],[]
Please help me :(

I hoping you can provide more information. v$log should not return information on standby, V$STANDBY_LOG will.
Are you preforming the query on the primary or standby side?
What version of Oracle are you using?
Why do you need to remove the standby log?
You should only have to clear a logfile if it has become corrupt, what make you think this is the case?
If you can provide more details if would be very helpful.
Best Regards
mseberg
Since you have posted the exact same question in the GENERAL DATABASE section and refuse to supply version information there you really have provide more details before anybody will help you.
Remove standby redo log, get ORA-00600
Edited by: mseberg on Apr 9, 2011 5:35 AM

Display / setup user defined log file in Oracle AS 10.1.3 ascontrol.

Hello,
One of my requirement is to display user defined log file into asconsole (OAS 101.3 EM) from $OH/j2ee/home/log/<myapplication>.log into OAS EM.
Please suggest.
Thanks,
Kam

As a sanity test, can you do the following: cd /home/oracle/product/10.1.3/OracleAS_1/j2ee/home
cd applications/xmjfcx/xmjfcx/WEB-INF/lib
jar tvf commons-validator.jar
jar xvf commons-validator.jar META-INF/MANIFEST.MFI use two "cd" just to make it more readable. Then use you editor to check the file MANIFEST.MF. Anything problem?

Can I generate .txt / .log file from Oracle Diagnostic Logging?

Hi all,
on my application I need to limit the size of application log, I've read this [http://download.oracle.com/docs/cd/B25221_04/web.1013/b14432/logadmin.htm#CHDJHHHB|http://download.oracle.com/docs/cd/B25221_04/web.1013/b14432/logadmin.htm#CHDJHHHB] that using ODL, but generated file is .xml, but I need .log / .txt file. How can I do this??
thanks in advance.
Regards,
Kahlil

ODL generates log files in XML format only. Using ODL you can not have plain text format log files. You have to decide what is more desired - log rotation (that ODL provides) or text format (which is the default, non-ODL, format). If text format is more desired than don't enable ODL and write your own shell script to rotate application log (but that can only be done while OC4J is down).
At the same time if you are concern about readability of log file (i.e. text format is easier to read vs. xml format) than you might consider using one the log viewer tool (log viewer in EM or printlogs command line) provided by Oracle. Both of these tools help you view the logs in much more readable format than just looking at xml format log file.
(printlogs utility is under $OH/diagnostic/bin directory. Run "printlogs -help" to read about it).
Hope this helps.
Thanks
Shail

Generating a log file from oracle db

I want to generate a log file in which i want to dump some useful messages, when anyone does a dml operation on a table, and also, i want to have a switch like YES or NO (may be an environment variable,,) if i switch it to YES the log file should get generated, if NO then, no log file will be generated..
can anyone help, how can you do this task ?
thanks a lot in advance..
srini

You can use a Trigger and UTL_FILE to write to a file (on the server).
Example:
create or replace trigger test_file
after insert or delete or update on test_case
for each row
declare
v_logfile utl_file.file_type;
begin
v_logfile := utl_file.fopen('\myfiles','test_file.log','a');
if inserting then
     utl_file.put_line(v_logfile,'Inserting to table');
elsif deleting then
     utl_file.put_line(v_logfile,'Deleting to table');
else
     utl_file.put_line(v_logfile,'Updating to table');
end if;
utl_file.fclose(v_logfile);
end test_file;
I want to generate a log file in which i want to dump some useful messages, when anyone does a dml operation on a table, and also, i want to have a switch like YES or NO (may be an environment variable,,) if i switch it to YES the log file should get generated, if NO then, no log file will be generated..
can anyone help, how can you do this task ?
thanks a lot in advance..
srini

Managing and configuring log files for Oracle 9ias

Hi all,
I'm wondering where I can find documentation on managing and configuring log files like:
ORACLE_HOME/admin/ sid/*dump/* ORACLE_HOME/assistants/opca/install.log ORACLE_HOME/webcache/logs/*
ORACLE_HOME/dcm/logs/*
ORACLE_HOME/ldap/log/*
ORACLE_HOME/opmn/logs/*
ORACLE_HOME/sysman/log/*
ORACLE_HOME/j2ee/ OC4J_instance/log/*/* ORACLE_HOME/config/schemaload.log ORACLE_HOME/config/useinfratool.log
because I didn't find anything in document like:
Oracle9 i Application Server
Administrator�s Guide
Release 2 (9.0.2)
May 2002
Part No. A92171-02
So, if anyone has any idea...
Thanks in advance

Does anyone know how or if it is possible to send the stdout and/or stderr to the log4j type of logging? I already capture the stdout and stderr to the flat file. But I would like to timestamp every line to compare and diagnose problems with each application that encounters problems. Each web app is using log4j to their own application log4j log file. When they encounter errors or resource draining problems, I would like to see the container logs and see what was occuring inside the container at around that same time.
Any ideas?

Standby Redo Log Files and Directory Structure in Standby Site

Hi Guru's
I just want to confirm, i know that if the Directory structure is different i need to mention these 2 parameter in pfile
on primary site:
DB_CONVERT_DATAFILE='standby','primary'
LOG_CONVERT_DATAFILE='standby','primary'
On secondary Site:
DB_CONVERT_DATAFILE='primary','standby'
LOG_CONVERT_DATAFILE='primary','standby'
But i want to confirm this wheather i need to issue the complete path of the directory in both the above paramtere:
like:
DB_CONVERT_DATAFILE='/u01/oracle/app/oracle/oradata/standby','/u01/oracle/app/oracle/oradata/primary'
LOG_CONVERT_DATAFILE='/u01/oracle/app/oracle/oradata/standby','/u01/oracle/app/oracle/oradata/primary'
Second Confusion:-
After transferring Redo Standby log files created on primary and taken to standby on the above mentioned directory structure and after restoring the backup of primary db alongwith the standby control file will not impact the physical standby redo log placed on the above mentioned location.
Thanks in advance for your help

Hello,
Regarding your 1st question, you need to provide the complete path and not just the directory name.
On the standby:
db_file_name_convert='<Full path of the datafiles on primary server>','<full path of the datafiles to be stored on the standby server>';
log_file_name_convert='<Full path of the redo logfiles on primary server>','<full path of the redo logfiles on the standby server>';
Second Confusion:-
After transferring Redo Standby log files created on primary and taken to standby on the above mentioned directory structure and after restoring the backup of primary db alongwith the standby control file will not impact the physical standby redo log placed on the above mentioned location.
How are you creating the standby database ? Using RMAN duplicate or through the restore/recovery options ?
You can create the standby redo logs later.
Regards,
Shivananda

Resizing redo log files on a 3 node RAC with single node standby database

Hi
On a 3 node 11g RAC system,I have to resize the redo logs on primary database from 50M to 100M. I was planning to do the following steps:
SQL> select group#,thread#,members,status from v$log;
GROUP# THREAD# MEMBERS STATUS
1 1 3 INACTIVE <-- whenefver INACTIVE, logfile group can be dropped
2 1 3 CURRENT & resized, switch logfile can change logfile group
3 1 3 INACTIVE
4 2 3 INACTIVE
5 2 3 INACTIVE
6 2 3 CURRENT
7 3 3 INACTIVE
8 3 3 INACTIVE
9 3 3 CURRENT
9 rows selected.
SQL> alter database drop logfile group 1;
Database altered.
SQL> ALTER DATABASE ADD LOGFILE THREAD 1
GROUP 1 (
'/PROD/redo1/redo01a.log',
'/PROD/redo2/redo01b.log',
'/PROD/redo3/redo01c.log'
) SIZE 100M reuse; 2 3 4 5 6
Database altered.
However I am not sure what needs to be done for the standby. The standby_file_management is set to auto and it is single instance standby.
SQL> select group#,member from v$logfile where type='STANDBY';
GROUP#
MEMBER
10
/PROD/flashback/PROD/onlinelog/o1_mf_10_7b44gy67_.log
11
/PROD/flashback/PROD/onlinelog/o1_mf_11_7b44h7gy_.log
12
/PROD/flashback/PROD/onlinelog/o1_mf_12_7b44hjcr_.log
Please let me know.
Thanks
Sumathy

Hello;
For Redo and Standby redo this won't help :
standby_file_management is set to auto
On the Standby cancel recovery, then drop and recreate the redo and or Standby redo.
Then start recovery again.
Example ( I have a habit of removing the old file at the OS to avoid REUSE and conflicts )
SQL> ALTER DATABASE RECOVER MANAGED STANDBY DATABASE CANCEL;
SQL> ALTER SYSTEM SET STANDBY_FILE_MANAGEMENT='MANUAL';
alter database add standby logfile group 4
('/u01/app/oracle/oradata/orcl/standby_redo04.log') size 100m;
ALTER SYSTEM SET STANDBY_FILE_MANAGEMENT='AUTO'
Notes worth reviewing :
Online Redo Logs on Physical Standby [ID 740675.1]
Error At Standby Database Ora-16086: Standby Database Does Not Contain Available Standby Log Files [ID 1155773.1]
Example of How To Resize the Online Redo Logfiles [ID 1035935.6]
Best Regards
mseberg

Physical Standby Online Redo log files,

Hi,
I'm trying to create a physical standby database (10.2.0.3). I'm a little confused about the requirement for online redo logs on the standby.
in my standby alert log I get the following when I issue:
SQL> alter database recover managed standby database disconnect from session
"ORA-00313: open failed for members of log group 1 of thread 1
ORA-00312: online log 1 thread 1: '/appl/oradata/prod/prod_1_redo_01_02.log'
ORA-27037: unable to obtain file status
SVR4 Error: 2: No such file or directory
Additional information: 3"
/appl/oradata/prod/prod_1_redo_01_02.log is the path to the location of the online redo logs on the production system. This file does not exist on the standby filesystem so the error is correct.
I assume that it gets this information from the standby control file I created on the production system and copied over to the standby.
Do I need to copy the online redo logs from the primary over to the standby site or do I need to create online redo logs on the standby?
Does the standby need to have redo log files?
I'm not talking about 'standby log files' of the type created using 'alter database add standby log file'. I've not got that far yet.
I just need to establish if a physical standby requires online redo log files?
Thanks in advance,
user234564

I wanted to update this thread since I've been dealing with the exact same errors. The basic question is: "does a physical standby need the online redo logs?"
Answer: Not really, until one wants to switchover or failover (and become a primary database). Furthermore, whenever the MRP process is started, Oracle prepares for a possible switchover/failover by "clearing" the online redo logs (MetaLink note# 352879.1). It is not a big deal, since Oracle will build the actual redo files when the "alter database open resetlogs" is accomplished during a "role transition."
In our situation, we have decided to use our standby for nightly exports. We stop MRP, open the database read-only, then restart MRP. We built these standby DBs with RMAN. The RMAN duplicate process will not build the online redo log files until the database is opened for read/write (with resetlogs). However, we haven't had a need for read/write (i.e. a switchover).
Thus, every morning we have been getting the same errors that "user234564" posted above. At first the errors seemed scary, then we realized they were just a nusiance. In order to clean things up, all I did was just "cp" our stanby redo logs (SRL) into our online redo directories ensuring the names matched what was in v$logfile. When I restarted MRP, the alert log clearly showed Oracle clearing these "newly found" online redo logs.

Standby log files in Oracle Dataguard

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