Duplexing the Archive Log - is there a potential performance hit

Good Afternoon Oracle People -
I apologize if this question is silly or out of place.
Basically, we are looking at options for implementing a (cheap) DR solution for our Oracle Database.
Bottom line objective is to have a second copy of our production system (not running, offline) with a usable archive log to recover from at a remote site with a similar set of disk technologies etc.
The sites are linked by 100MBPs link - so any access to secondary site is relatively fast.
What I was thinking of doing is creating an iSCSI target on the destination SAN and adding this as a disk into the production database. Then, I was going to go in and define a duplex archive log destination to this iSCSI target.
My fear is that if the archiver waits for the write to the destination, I would imagine that this would slow down database access. Is this a valid concern? Or does Oracle treat the Duplex as a replicated (slower) copy?
Again, sorry if this question is stupid - i have tried the google machine but couldn't find anything, and it isn't all that clear from the documentation.
Kind Regards,
Aleksei

Or does Oracle treat the Duplex as a replicated (slower) copy?
Oracle treats it in a way you tell Oracle to treat it – please take a look at LOG_ARCHIVE_DEST_n parameters such as MANDATORY and OPTIONAL, MAX_FAILURE, etc
There are two major things to consider:
->Is the throughput of the destination enough to handle max archive log generation?
You need to take a look at the size of archive logs and how frequently they are
generated during peak load.
->What happens when the destination is not available?
HTH,
Iordan Iotzov

Similar Messages

How to find out who deleted the archive logs

Hi All,
Recently some archive logs were deleted from one of our servers. Is there any way to find out which user has deleted the archive logs through OS or through database ?
OS Version :-
SunOS Generic_Virtual sun4u sparc SUNW,SPARC-Enterprise
Database Version:-
SQL*Plus: Release 9.2.0.8.0 - Production on Mon Apr 9 01:12:15 2012

888132 wrote:
Hi All,
Recently some archive logs were deleted from one of our servers. Is there any way to find out which user has deleted the archive logs through OS or through database ?
OS Version :-
SunOS Generic_Virtual sun4u sparc SUNW,SPARC-Enterprise
Database Version:-
SQL*Plus: Release 9.2.0.8.0 - Production on Mon Apr 9 01:12:15 2012As explained by others, from oracle database there is no record if they are deleted from OS.
But you can probably find the history of OS command been run with history command :). You can get the date and time.
Following link can help
http://stackoverflow.com/questions/99755/how-do-i-get-the-command-buffer-in-solaris-10
http://www.cyberciti.biz/faq/unix-linux-bash-history-display-date-time/
http://www.linuxquestions.org/questions/solaris-opensolaris-20/in-solaris-command-line-how-to-get-the-previous-commands-573814/
But i suggest you to post in Sun OS forum to get more details as its nothing to do with Database(in this scenario)

*HOW TO DELETE THE ARCHIVE LOGS ON THE STANDBY*

HOW TO DELETE THE ARCHIVE LOGS ON THE STANDBY
I have set the RMAN CONFIGURE ARCHIVELOG DELETION POLICY TO APPLIED ON STANDBY; on my physical standby server.
My archivelog files are not deleted on standby.
I have set the CONFIGURE ARCHIVELOG DELETION POLICY TO NONE; # default on the Primary server.
I've checked the archivelogs with the FRA and they are not beign deleted on the STANDBY. Do I have to do something for the configuation to take effect? Like run a RMAN backup?
I've done a lot ofresearch and i'm getting mixed answers. Please help. Thanks in advanced.
J

Setting the Policy will not delete the Archive logs on the Standby. ( I found a thread where the Data Guard product manager says "The deletion policy on both sides will do what you want" ). However I still
like to clean them off with RMAN.
I would use RMAN to delete them so that it can use that Policy are you are protected in case of Gap, transport issue etc.
There are many ways to do this. You can simply run RMAN and have it clean out the Archive.
Example :
#!/bin/bash
# Name: db_rman_arch_standby.sh
# Purpose: Database rman backup
# Usage : db_rman_arch_standby <DBNAME>
if [ "$1" ]
then DBNAME=$1
else
echo "basename $0 : Syntax error : use . db_rman_full <DBNAME> "
exit 1
fi
. /u01/app/oracle/dba_tool/env/${DBNAME}.env
echo ${DBNAME}
MAILHEADER="Archive_cleanup_on_STANDBY_${DBNAME}"
echo "Starting RMAN..."
$ORACLE_HOME/bin/rman target / catalog <user>/<password>@<catalog> << EOF
delete noprompt ARCHIVELOG UNTIL TIME 'SYSDATE-8';
exit
EOF
echo `date`
echo
echo 'End of archive cleanup on STANDBY'
mailx -s ${MAILHEADER} $MAILTO < /tmp/rmandbarchstandby.out
# End of ScriptThis uses ( calls an ENV) so the crontab has an environment.
Example ( STANDBY.env )
ORACLE_BASE=/u01/app/oracle
ULIMIT=unlimited
ORACLE_SID=STANDBY
ORACLE_HOME=$ORACLE_BASE/product/11.2.0.2
ORA_NLS33=$ORACLE_HOME/ocommon/nls/admin/data
LD_LIBRARY_PATH=$ORACLE_HOME/lib:/lib:/usr/lib
LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/usr/local/lib
LIBPATH=$LD_LIBRARY_PATH:/usr/lib
TNS_ADMIN=$ORACLE_HOME/network/admin
PATH=$ORACLE_HOME/bin:$ORACLE_BASE/dba_tool/bin:/bin:/usr/bin:/usr/ccs/bin:/etc:/usr/sbin:/usr/ucb:$HOME/bin:/usr/bin/X11:/sbin:/usr/lbin:/GNU/bin/make:/u01/app/oracle/dba_tool/bin:/home/oracle/utils/SCRIPTS:/usr/local/bin:.
#export TERM=linux=80x25 wrong wrong wrong wrong wrong
export TERM=vt100
export ORACLE_BASE ORACLE_SID ORACLE_TERM ULIMIT
export ORACLE_HOME
export LIBPATH LD_LIBRARY_PATH ORA_NLS33
export TNS_ADMIN
export PATH
export MAILTO=?? your email hereNote use the env command in Unix to get you settings.
There are probably ten other/better ways to do this, but this works.
other options ( you decide )
Configure RMAN to purge archivelogs after applied on standby [ID 728053.1]
http://www.oracle.com/technetwork/database/features/availability/rman-dataguard-10g-wp-1-129486.pdf
Maintenance Of Archivelogs On Standby Databases [ID 464668.1]
Tip I don't care myself but in some of the other forums people seem to mind if you use all caps in the subject. They say it shouting. My take is if somebody is shouting at me I'm probably going to just move away.
Best Regards
mseberg
Edited by: mseberg on May 8, 2012 11:53 AM
Edited by: mseberg on May 8, 2012 11:56 AM

I accidently delete the archived log, how to recover?

There was old archived log file in a directory, I delete the directory, so when I backup whole archived log with RMAN, I often got error like this,
RMAN-06059: expected archived log not found, lost of archived log compromises recoverabiligy
ora-196525: error identifying file G:\oracle\oradata\archive\arc00081.001
I am using oracle 9.2 on windows XP
Edited by: user8117130 on Jun 14, 2009 9:35 PM

HI..
I delete the directory, so when I backup other archived log with RMAN, I often got error like this From metalink:-
Error:     RMAN-06059 (RMAN-6059)Text:     expected archived log not found, lost of archived log compromises
     recoverability
Cause:     The archived log was not found. The repository thinks it does
     exist. If the archived log has in fact been lost and there is no
     backup, then the database is no longer recoverable across the
     point in time covered by the archived log. This may occur because
     the archived log was removed by an outside utility without
     updating the repository.
Action:     If the archived log has been removed with an outside utility and
     the archivelog has already been backed up, then you can
     synchronize the repository by running CROSSCHECK ARCHIVELOG ALL.
     If the archivelog has not been previously backed up, then you
     should take a full backup of the database and archivelogs to
     preserve recoverability. Previous backups are not fully
     recoverable.
>
Anand

Unable to tranfer the Archive log to DR Setup

Hi All ,
Out Database Team reports that unable to transfer the archive log from Production database server to DR database Server.
For example, while transferring 70 MB of file, the connection is getting aborted after transferring 11 MB.
We confirm from the network team, that there is no issue with router or PIX.
Please provide the suggestion.
Regards,
R. Rajesh Kannan.

Hi,
You can sending few files of different sizes eg 10MB,20MB,30MB.....
and you will know the problem is from the SIZE of the file or something else.
I our case we are using compression boxes to ship data between production and DR site.
Regards
MMU

Why the flashback log'size smaller than the archived log ?

hi, all . why the flashback log'size smaller than the archived log ?

Lonion wrote:
hi, all . why the flashback log'size smaller than the archived log ?Both are different.
Flash logs size depends on parameter DB_FLASHBACK_RETENTION_TARGET , how much you want to keep.
Archive log files is dumped file of Online redo log files, It can be either size of Online redo log file size or less depending on online redo size when switch occurred.
Some more information:-
Flashback log files can be created only under the Flash Recovery Area (that must be configured before enabling the Flashback Database functionality). RVWR creates flashback log files into a directory named “FLASHBACK” under FRA. The size of every generated flashback log file is again under Oracle’s control. According to current Oracle environment – during normal database activity flashback log files have size of 8200192 bytes. It is very close value to the current redo log buffer size. The size of a generated flashback log file can differs during shutdown and startup database activities. Flashback log file sizes can differ during high intensive write activity as well.
Source:- http://dba-blog.blogspot.in/2006/05/flashback-database-feature.html
Edited by: CKPT on Jun 14, 2012 7:34 PM

Where to keep the archived log in a cluster environment.

Hi
Where it is good to keep the archive log file. on shared storage or on local instance.
thanks.

Where it is good to keep the archive log file. on shared storage or on local instance.
It is always good to keep the archivelog files at shared storage location. This location is accessible to all instances, so in case of failure you can recover the database from any of the instances.
Rgds.

How to delete the archive logs.

Hi,
I need to delete the archive logs in standby database which has been generated after created the restore point.
SEQUENCE# APPLIED
17 YES
18 YES
1 NO
2 NO
19 YES
18 YES
21 YES
22 YES
20 YES
23 YES
24 YES
sequence 1,2 has been generated after created the restore point,how can i remove sequence# 1 and 2 from the v$archived_log;
ways i have tried
1.dropped the restore point during that time only the flashback logs has been deleted not the archive log
2.manually tried from rman ,but i was not working.
please help me out....
***points are waiting for you guys****

Hi,
I need to delete the archive logs in standby database which has been generated after created the restore point.
SEQUENCE# APPLIED
17 YES
18 YES
1 NO
2 NO
19 YES
18 YES
21 YES
22 YES
20 YES
23 YES
24 YES
sequence 1,2 has been generated after created the restore point,how can i remove sequence# 1 and 2 from the v$archived_log;
ways i have tried
1.dropped the restore point during that time only the flashback logs has been deleted not the archive log
2.manually tried from rman ,but i was not working.
please help me out....
***points are waiting for you guys****

How to disable the archive logs in SAP IDES(Windows) using SQL Server

can any body tell us How to disable the archive logs in SAP IDES(Windows 2003) using SQL Server 2000.SP4.?

Hi,
Unfortunately, SQL Server does not have the option to turn off transaction logging. You can set the recovery mode to SIMPLE, instead of FULL. This will result in the transaction log being truncated on checkpoint.
http://support.microsoft.com/kb/873235 - check this microsoft article
This will help in reduction of the size of the transcation log.
- Regards, Dibya

Where are the archived log?

I've set my server to archive mail logs every 7 days, but I cannot find where they are archived. I do not see anything other than the normal complement of log files in /var/log. Yes it has been more than a week. But where do they go and what are they called?

It appears that you're assuming rather more around the word "archive" than exists here.
The archives that you seek are (also) stored in the /var/log directory.
The log files use the extension .log, and the log archive files use extensions such as .bz2 or .gz, and the associated data compression schemes.
The following shell command:
$ sudo find / -name ipfw -print
will show you all files with the substring ipfw in the filename. Which will show you a few files here and there on your disk that are related to the firewall, including the man pages, and the /var/log directory.
But no secret archives.
Run some tests with the archive settings over a week or two, and watch what happens in the /var/log directory.

How to backup the archived log after a crosscheck .

Hi all,
Here is the scenario:
My archive area got full, I moved some archived logs to another destination. My main script to backup archive log raised a error informing that some files were missing, so I issued a crosscheck archivelog all command.
I realized that I did something insane and is there any way to fix it? I mean, how could I backup the missed sequence? Because I'll need to send them to a tape and also register the files in the RMAN's catalog.
Regards and thanks in advance,
Emerson

user11983913 wrote:
Hi all,
Here is the scenario:
My archive area got full, I moved some archived logs to another destination. My main script to backup archive log raised a error informing that some files were missing, so I issued a crosscheck archivelog all command.
I realized that I did something insane and is there any way to fix it? I mean, how could I backup the missed sequence? Because I'll need to send them to a tape and also register the files in the RMAN's catalog.
Regards and thanks in advance,
EmersonHi Emerson
Use the following command to register moved archived redo logs to RMAN repository
CATALOG ARCHIVELOG '';

How to recover the database when some of the archive log file get deleted.

I am facing a problem with Oracle database, which is related to archivelogs.
Our development database is running in archivelog mode, but we don't have backups scheduled and have no recovery catalog.
When the database was in running condition, disk got full, so some archivelogs were deleted manually.
After this they restarted the DB, and now DB is not coming up. Errors are as follows:
SQL> startup
ORACLE instance started.
Total System Global Area 1444383504 bytes
Fixed Size 731920 bytes
Variable Size 486539264 bytes
Database Buffers 956301312 bytes
Redo Buffers 811008 bytes
Database mounted.
ORA-01589: must use RESETLOGS or NORESETLOGS option for database open
SQL> alter database open resetlogs;
alter database open resetlogs
ERROR at line 1:
ORA-01113: file 1 needs media recovery
ORA-01110: data file 1: '/export/home/oracle/dev/ADVFRW/ADVFRW.system'
SQL> recover datafile '/export/home/oracle/dev/ADVFRW/ADVFRW.system'
ORA-00283: recovery session canceled due to errors
ORA-01610: recovery using the BACKUP CONTROLFILE option must be done
SQL> recover database using backup controlfile;
ORA-00279: change 215548705 generated at 09/02/2008 17:06:10 needed for thread
1
ORA-00289: suggestion :
/export/home/oracle/dev/ADVFRW/ADVFRW.archivelog1/LOG_ADVFRW_1107_1.ARC
ORA-00280: change 215548705 for thread 1 is in sequence #1107
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
/export/home/oracle/dev/ADVFRW/ADVFRW.archivelog1/LOG_ADVFRW_1107_1.ARC
ORA-00308: cannot open archived log
'/export/home/oracle/dev/ADVFRW/ADVFRW.archivelog1/LOG_ADVFRW_1107_1.ARC'
ORA-27037: unable to obtain file status
SVR4 Error: 2: No such file or directory
Additional information: 3
Specify log: {<RET>=suggested | filename | AUTO | CANCEL}
CANCEL
Media recovery cancelled.
SQL>
1. How to recover the database and bring it online
Any help will be highly appreciated.
With Regards
Hemant Joshi
Edited by: hem_Kec on Sep 7, 2008 9:07 AM

Hi,
Archive log files are the copies of redolog files.As redo log files are circularly overwritten,oracle generates archive log file of the corresponding redo logfiles being overwritten.So if you have a backup that dates back to 10 am in the morning and if your database creashed at 3 pm,you cannot use the redo log files alone as they have incomplete information.To completely recover the database upto 3 pm,you need archive log files generated between 10 am to 3 pm. In your case since you are missing one archive log file,you cannot perform complete recovery and hence would suffer data loss.

How can i see the Archive log backup contens from th tapes

hello
I am taking Archive log Backup regularly
i want ot chk my backup contents from tape through the db2 command
From DB13 it is showing successfully Completed
but for the comfirmation where and how i can see the contents of tape
Point in advance from me
Jayesh

Hello Jayesh ,
using db2tapemgr you can display the tape header DB2TAPEMGR.HEADER using
db2tapemgr SHOW TAPE HEADER <tape device>
in "contents:" field you can see , which logfiles are on tape at which position .
see
[db2tapemgr - Manage log files on tape command|http://publib.boulder.ibm.com/infocenter/db2luw/v9r5/index.jsp?topic=/com.ibm.db2.luw.admin.cmd.doc/doc/r0011704.html]
[IBM DB2 Universal Database for UNIX and Windows:New Log File Management|https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/50c7d3ef-5a59-2a10-a3ab-fb3b0887f479]
Best regards
dirk

How can I remove the crash logs? There's so many, no more room to write new ones.

From the system log
Feb 19, 2012 7:42:21 PM - ReportCrash [255] (Error): Failed to save memory report to /Library/Logs/CrashReporter/LowMemory-2012-02-19-194221.plist using uid: 0 gid: 0, euid: 0 egid: 0. 100 logs already present.
You eee, every day my ipad ios 5.01 crashes multiple times. Usually in safari. But now even atomic browser is starting with the same thing. What ever happened to apple?

I always shut down apps. Usually only have safari and settings. I clear data and history. Hard reboot Turned off all use of icloud Etc etc. nothing works.
I should simply accept this buggy OS? Wow. Okay. Sure. Youre right. No choice but to. That seems to be apples intention. After all, the next big thing is... Next couple weeks right?
Whatever happened to apple?

How does oracle suggest the archive log

Hi All,
My question is about user managed backup and recovery.
For User managed hot database refreshes.
We create a new controlfile and do cancel based recovery.
How does oracle suggest the next archive to apply when we do "recover database using backup controlfile until cancel;"
I mean we created a new control file ..rt.
where is the information about the archivelogs stored.
Thanks,
Silver

In the controlfile.
The "using backup controlfile" means using a backed up controlfile, and you want to fool Oracle into thinking a point in time recovery will happen so don't use what would be the controlfiles current scn time to automatically say the recovery is complete. If you have created a new controlfile, all it can know about is where the logs should be and compare to what log sequences the datafile headers have. So it uses the init.ora parameters and what the data file headers have in them to figure it out. http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:3151992035532#36651366990046
If you backup controlfile to trace you can see log files that have the incarnation history. See "Recovering Through a RESETLOGS with a Created Control File" in Performing User-Managed Recovery: Advanced Scenarios

Duplexing the Archive Log - is there a potential performance hit

Similar Messages

Maybe you are looking for