Performance deteriorates with archivelog mode

hi,
i want to implement an incremental backup procedure for a 9i database, but the database is in noarchivelog mode.
switching to archivelog mode results in a considerable loss of performance.
is there anything that can be done to either make incremental backups in it's current state, or speed up performance once it is in archivelog mode?
thanks
santosh sewlal

You will be able to get a lot of information about all books in this link :
http://otn.oracle.com/pls/db92/db92.docindex?remark=homepage
[email protected]
Joel P�rez

Similar Messages

OLAP in 10G with ARCHIVELOG mode

Can we place 10G database in ARCHIVELOG mode with OLAP? Currently we are at 9204 and our database is running in NOARCHIVELOG mode. I am new here and I was told that there is some issue with the OLAP that prevents placing the database in ARCHIVELOG mode. Is it true? If it is true then has it been fixed in 10G as we want to take advantage of FLASHBACK query option of 10G and that will require the database to be in ARCHIVE mode?
Thanks

it's a slight misunderstanding.
You can recover the cold backup and switch it on. -therefore you will have a database from the point of the cold backup.
if you want to use the archivelogs to restore then that's a little more involved

Coldbackup with Archivelog mode

I am running database in archive mode and I also take a coldbackup once a week. I was wondering if I ever need to recover this database from backup, how am I going to apply archive logs created after cold backup taken. since restoring database from cold backup will be in consistent state. Do i need to restore backup controlfile and do incomplete recovery?

it's a slight misunderstanding.
You can recover the cold backup and switch it on. -therefore you will have a database from the point of the cold backup.
if you want to use the archivelogs to restore then that's a little more involved

Performance hit when running in ARCHIVELOG mode.

What is the performance hit when running in ARCHIVELOG mode?
Thank you,
David

I am not one to disagree with Tom Kyte (unless I think he is wrong :) ), and I am not going to disagree here. I do caution the simplistic answer that the hit is negligible. I commend the respondent who qualified that answer with a discussion of I/O.
I have come across more than one situation where archive logging was a performance hit because of the associated I/O. Many want to put archive logs on cheaper storage and do not recognize that not only can this slow a system but that it could become a major issue resulting in a system that hangs until the logs are written. A better solution for these folks is to write to fast storage and have a secondary process that offloads those logs to the slower storage.
Let us also not assume that the archive location is local disk. It might be that an archive location is remote, such as with log shipping or NFS. Network latency can become an issue.
There are many things to consider as there always are. I suppose with any answer, even if simple, one could spin it with some obscure situation that makes the simple answer inappropriate. Having seen some burned by this issue, I chose to elaborate, and I appreciate your indulgence.
Chris

Adobe Reader Performance with Protect Mode On

We are getting very poor performance in opening PDF documents with Adobe Reader XI with Protected Mode on, particularly for users remote from our central server. With Protected Mode off, performance is much better (10-20X faster opening). Note that we are running Windows 7 with Application Data Roaming and Adobe Reader XI with Protected Mode on, Protected View off, and Advanced Security on. We have diagnosed the problem as follows: We are using the Windows 7 Application Roaming Data feature to house some profile data for our remote users, and when they try to open a PDF document with Protected Mode on, Adobe sends numerous I/O packets (approximatel 6000!) across the "wire" for security checking against the Application Roaming data file on the central server, thus greatly slowing PDF opening. We would like to know the following: 1) Is there a way to turn-off Protected Mode for company server stored documents, while keeping it active for documents received from external sources (e.g. from the internet, e-mail, etc.). 2) is there a way to have Protect Mode security verification done only on the local machine profile data and not on the centrally stored Application Roaming Data file (thus greatly reducing the "across the wire" I/O traffic). Thanks for any help, CCB.

I don't think any of the scenarios you are envisaging are possible. Protected Mode is enabled/disabled on a user basis (in HKEY_USERS).

Rman backup with no archivelog mode

Hi Friend,
I did this backup many times before, to backup a test db which is not in archivelog mode.
My procedure are the following:
$ rman target /
rman> run {
shutdown immediate;
startup mount;
backup format '/u02/RMAN/%d_LVL0_%T_%u_s%s_p%p' database;
delete obsolete;
But strange I got now error:
ORA-19602: cannot backup or copy active file in NOARCHIVELOG mode
Thanks a lot

Hi,
Paste the snap shot of what you actually doing and what error messages are coming. That will help to analyze the problem.
This basically happens when your shutdown is not normal or clean.
One way is to again startup the database and then issue shutdown Normal.
Regards,
Edited by: Navneet on Sep 30, 2008 3:21 AM

Restore using incremental backup with noarchivelog mode

Hello experts,
We are running SAP on Oracle databse(IN NOARCHIVELOG MODE) for which we are having full offline backup on every sunday and post which incremental backups on rest of the days. We have scenario to do restore db to the state till last friday's incremental backup.
Please let us know the procedure for restoring till that point. If possible using brtools utility(which is SAP specific).
Thank You
Regards,
Venkateshwar

If you do not want to read the whole doc This is the snippet for you.
Recovering a NOARCHIVELOG Database with Incremental Backups
Restoring a database running in NOARCHIVELOG mode is similar to restoring a database in ARCHIVELOG mode. The main differences are:
Only consistent backups can be used in restoring a database in NOARCHIVELOG mode.
Media recovery is not possible because no archived redo logs exist.
You can perform limited recovery of changes to a database running in NOARCHIVELOG mode by applying incremental backups. The incremental backups must be consistent, like all backups of a database run in NOARCHIVELOG mode, so you cannot make backups of the database when it is open.
When you are recovering a NOARCHIVELOG database, specify the NOREDO option on the RECOVER command to indicate that RMAN should not attempt to apply archived redo logs. Otherwise, RMAN returns an error.
To recover a NOARCHIVELOG database with incremental backups:
After connecting to the target database and the recovery catalog, place the database in a mounted state:
STARTUP FORCE MOUNT
Restore and recover the database.
For example, you can perform incomplete recovery with the following commands:
RESTORE DATABASE
FROM TAG "consistent_whole_backup";
RECOVER DATABASE NOREDO;
Open the database with the RESETLOGS option.
For example, enter the following command:
ALTER DATABASE OPEN RESETLOGS;

Backup in ARCHIVELOG Mode

Dear Sirs,
Actually I've a non archivelog mode RDBMS, but I wan't to make a
hot backup. Could I make a hot backup after I turn the
ARCHIVELOG mode ON, then turn it off again after Back - Up ?
And how do I make the hot backup ?
Thank you for the attention and help.
Regards,
Tonny

You could turn archivelog mode on, do the backup, and then turn
archivelog mode off. This really defeats the purpose of hot
backups though. You would have to know the SCN, archivelog
file, or time to do a point-in-time recovery manually, or if you
are using RMAN knowing the time will help. I think RMAN will
recover until the last archivelog if you don't specify a time or
SCN. Keep in mind that you will lose all the changes since the
last backup if you turn archivelog mode off after the backup and
your database crashes inbetween the next scheduled backup. If
you are going through the trouble for turning archivelog mode on
and then off I would perform a cold backup. You have to
shutdown the database with normal or immediate, mount the
database, turn archvelog mode on/off and then open the
database. So why not just do a cold backup?

ARCHIVELOG MODE --- Please assist

dear experts,
I have this doubt in my mind and would like you guys to advise on.
Is it true that when a database is in ARCHIVELOG MODE, database recovery using archived logs & hotbackup is possible to the last commit?
probably using the command: recover database using backup controlfile until cancel; (to apply all the arhive logs to last hotbackup)
From my point of view, i feel that the database recovery using the ARCHIVED LOGS and hotbackup is possible only up to the last redo log switch. In order to recover the database to the last commit, I have to recover the database using both the ARCHIVED LOGS as well as the last ACTIVE REDO LOG.
It is because the most recent commited transactions on the current redo log might not be written to archive log (as the active log is not full and no alter system switch logfile performed) at the point of time when the db crashed.
Please advise.
thanks all!

Also, by using RMAN you can approach more to the last commit with RMAN parameters like SCN, etc.
It's quite easy!

Archivelog mode features

Hello,
Can I get a complete list of the tasks which can not be performed in noarchive log mode ? I mean in which tasks / features in different Oracle versions i.e. enterprise/standard and version numbers 10.2.0.1 to 11.2.0.1; db must be in archivelog mode.
i.e.
I can not do in noarchive log mode :
1.standby db
2.tablespace in begin backup mode
3.tablespace PITR
4.rman catalog
Can you add more please? or please correct above list ?
One more last question :
From which Oracle Version, Oracle introduced archive log mode.
Thank you.

I would like to add below tasks/features :
ALTER DATABASE DATAFILE '/u02/oracle/rbdb1/stuff01.dbf' OFFLINE;
The database must be in ARCHIVELOG mode if you are creating a guaranteed restore point.
Oracle Error: ORA-01239 : Database must be in ARCHIVELOG mode to use external cache
For LogMiner the database must be in archivelog mode with supplemental logging enabled.
To use RMAN recover ... block command, because RMAN need the archivelog to perfom block recovery.
Asynchronous Distributed Change Data Capture (CDC) requires archivelogs.
Hot cloning.
@ Sybrand :
Thank you Sybrand for the historical information.
Regards
Girish Sharma

Archivelog Mode Disadvantages

Hello,
We have a 9i DB running Bussiness Objects taking up 15 TB of space.
We need to take hot backups, therefore we need to switch to Archivelog mode.
What are the main disadvantages of doing that? (Performance, Space, etc.)
Please do let me know what info you need regarding the performance of the DB so you can make an arpox estimation.
Thank you in advance.

Chinar wrote:
You have 15 TB database with NOARCHIVELOG mode and that is very dangerous.That decision can only be made given the requirement and risk analysis of the content of that database.
The nature of data in the database is very much relevant here. Not all data is critical business data. Data can be transient in nature - in other words, data with a short TTL (time-to-live). And transient data is often pretty large in volume too (think along the lines of telemetry type data where the requirement is for a 5 minute semi-realtime processing window) .
Yes, the majority of corporate information systems are not like this. But one cannot make a blanket statement that a database not running archivelog mode, is "+dangerous+".
Oracle is not just used in the run-of-the-mill databases dealing with HR, financials and the like. Archive logging should be a conscious decision taking requirements and risks into account - and not an automatic mandatory requirement. Yes, in most cases archive logging will be decided on. And that is not the issue - the issue is that the decision was based on actual requirement analysis and not a "+rule of thumb+" that seems to be a good idea..

Performance issues with version enable partitioned tables?

Hi all,
Are there any known performance issues with version enable partitioned tables?
Ive been doing some performance testes with a large version enable partitioned table and it seems that OCB optimiser is choosing very expensive plans during merge operations.
Tanks in advance,
Vitor
Example:
     Object Name     Rows     Bytes     Cost     Object Node     In/Out     PStart     PStop
UPDATE STATEMENT Optimizer Mode=CHOOSE          1          249
UPDATE     SIG.SIG_QUA_IMG_LT
NESTED LOOPS SEMI          1     266     249
PARTITION RANGE ALL                                   1     9
TABLE ACCESS FULL     SIG.SIG_QUA_IMG_LT     1     259     2               1     9
VIEW     SYS.VW_NSO_1     1     7     247
NESTED LOOPS          1     739     247
NESTED LOOPS          1     677     247
NESTED LOOPS          1     412     246
NESTED LOOPS          1     114     244
INDEX RANGE SCAN     WMSYS.MODIFIED_TABLES_PK     1     62     2
INDEX RANGE SCAN     SIG.QIM_PK     1     52     243
TABLE ACCESS BY GLOBAL INDEX ROWID     SIG.SIG_QUA_IMG_LT     1     298     2               ROWID     ROW L
INDEX RANGE SCAN     SIG.SIG_QUA_IMG_PKI$     1          1
INDEX RANGE SCAN     WMSYS.WM$NEXTVER_TABLE_NV_INDX     1     265     1
INDEX UNIQUE SCAN     WMSYS.MODIFIED_TABLES_PK     1     62
/* Formatted on 2004/04/19 18:57 (Formatter Plus v4.8.0) */
UPDATE /*+ USE_NL(Z1) ROWID(Z1) */sig.sig_qua_img_lt z1
SET z1.nextver =
SYS.ltutil.subsversion
(z1.nextver,
SYS.ltutil.getcontainedverinrange (z1.nextver,
'SIG.SIG_QUA_IMG',
'NpCyPCX3dkOAHSuBMjGioQ==',
4574,
4575
4574
WHERE z1.ROWID IN (
(SELECT /*+ ORDERED USE_NL(T1) USE_NL(T2) USE_NL(J2) USE_NL(J3)
INDEX(T1 QIM_PK) INDEX(T2 SIG_QUA_IMG_PKI$)
INDEX(J2 WM$NEXTVER_TABLE_NV_INDX) INDEX(J3 MODIFIED_TABLES_PK) */
t2.ROWID
FROM (SELECT /*+ INDEX(WM$MODIFIED_TABLES MODIFIED_TABLES_PK) */
UNIQUE VERSION
FROM wmsys.wm$modified_tables
WHERE table_name = 'SIG.SIG_QUA_IMG'
AND workspace = 'NpCyPCX3dkOAHSuBMjGioQ=='
AND VERSION > 4574
AND VERSION <= 4575) j1,
sig.sig_qua_img_lt t1,
sig.sig_qua_img_lt t2,
wmsys.wm$nextver_table j2,
(SELECT /*+ INDEX(WM$MODIFIED_TABLES MODIFIED_TABLES_PK) */
UNIQUE VERSION
FROM wmsys.wm$modified_tables
WHERE table_name = 'SIG.SIG_QUA_IMG'
AND workspace = 'NpCyPCX3dkOAHSuBMjGioQ=='
AND VERSION > 4574
AND VERSION <= 4575) j3
WHERE t1.VERSION = j1.VERSION
AND t1.ima_id = t2.ima_id
AND t1.qim_inf_esq_x_tile = t2.qim_inf_esq_x_tile
AND t1.qim_inf_esq_y_tile = t2.qim_inf_esq_y_tile
AND t2.nextver != '-1'
AND t2.nextver = j2.next_vers
AND j2.VERSION = j3.VERSION))

Hello Vitor,
There are currently no known issues with version enabled tables that are partitioned. The merge operation may need to access all of the partitions of a table depending on the data that needs to be moved/copied from the child to the parent. This is the reason for the 'Partition Range All' step in the plan that you provided. The majority of the remaining steps are due to the hints that have been added, since this plan has provided the best performance for us in the past for this particular statement. If this is not the case for you, and you feel that another plan would yield better performance, then please let me know and I will take a look at it.
One suggestion would be to make sure that the table was been recently analyzed so that the optimizer has the most current data about the table.
Performance issues are very hard to fix without a reproducible test case, so it may be advisable to file a TAR if you continue to have significant performance issues with the mergeWorkspace operation.
Thank You,
Ben

Cannot Install Windows 7 with AHCI mode

Hello,
Having just submitted a support ticket to MSI, I was curious to see if anyone else has experienced a similar issue or may be able to suggest a possible resolution.
I recently purchased a MSI Z87-G41 PC Mate for an htpc build.
I've ran into an issue of not being able to install Windows 7 Ultimate 64 bit onto my ANY SATA 3 hard drive with SATA mode - AHCI enabled in bios.
Main parts for the build are:
Motherboard: MSI Z87-G41 PC Mate
CPU: Intel Core i3-4130 3.4 3 FCLGA 1150
RAM: G.SKILL Ares Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600
PSU: Corsair Builder Series CX 600
OS HD: Crucial M500 SSD
During Windows install and selecting the SSD in which to install windows onto..
Windows will prompt with: “Windows cannot be installed to Disk x Partition x. (Show details)
Afterwards, I’ll select ‘Load driver’ and select the “Intel Rapid Storage Technology Driver for 8x series,” provided by MSI drivers download page. Confirmed as a valid driver for the SATA AHCI controller.
"Select the driver to be installed" lists: “Intel(r) 8 Series/C220 Chipset Family SATA AHCI Controller” Looks good, then progress...
Followed by clicking on next- “Setup was unable to create a new system partition or locate an existing system partition. See the setup log files for more information.”
I've tried installing Windows 7 Ultimate 64 bit via USB drive and OEM disc to no avail.
Performed a test using the same install procedure with my primary desktop computer which uses a MSI z68A-GD65 (G3) motherboard (AHCI enabled.) I was able to install windows to my Crucial M500 SSD without issue.
Confirmed the issue occurs while testing with different hard drives. I have yet to be able to install windows with AHCI enabled on this motherboard.
HDDs tested include:
WD Black WD5002AALX 500GB
Seagate ST3100524AS 1TB
Once I change SATA mode from AHCI to IDE, I was able to install windows without the need of pre-loading the Intel 8 Series SATA/AHCI driver.
Afterwards having installed windows, I decided to test by switching SATA mode back to AHCI. Doing so will cause the machine to bsod upon booting to windows. Later, I performed the registry edit to change IDE to AHCI mode within windows. Followed by again enabling AHCI in bios.
I was able to boot while in AHCI mode temporarily a couple of times until this method stopped working. Any attempt past the bios post, windows will not boot.
I've also tested the manual and XMP profile RAM settings as suggested by the sticky'd thread here https://forum-en.msi.com/index.php?topic=178019.0
I would like to possibly resolve the issue in regards to utilizing AHCI mode for optimal performance for my hard drives and hot swap capability.
When I have more time, I suppose I can run a RAM test; but so far I simply believe it may just be a SATA controller or driver conflict with the motherboard.
tl;dr Cannot install Windows 7 onto any hard drive with AHCI enabled. Works fine with IDE mode.

** Update as of 6/3/2014 ** Issue resolved.
Received my replacement motherboard from RMA. Replacement is working without any issues with SATA mode set to AHCI.
Tested by running Windows 7 and Windows 8 install - both detected my SATA SSD and other HDDs as applicable drives to install Windows onto. Pre-loading the SATA controller drivers was not necessary. Windows boots up immediately without any delay now. Benchmarks are showing valid stats for SATA3 devices.
Also to note, the replacement motherboard came with bios version 1.5, compared the one I sent back which came with 1.6. In case if that had anything to do with it. Not going to risk updating the bios at this point.
Video of issue:
Benchmarks from the old motherboard on the Crucial M500 SSD taken with Crystal DiskMark
Benchmark from MSI Z87-G41 PC Mate (MS-750)
on SATA 3 port set to AHCI
CrystalDiskMark 3.0.3 x64 (C) 2007-2013 hiyohiyo
Crystal Dew World
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]
Sequential Read : 264.792 MB/s
Sequential Write : 143.991 MB/s
Random Read 512KB : 250.614 MB/s
Random Write 512KB : 142.545 MB/s
Random Read 4KB (QD=1) : 24.176 MB/s [ 5902.3 IOPS]
Random Write 4KB (QD=1) : 82.152 MB/s [ 20056.5 IOPS]
Random Read 4KB (QD=32) : 210.018 MB/s [ 51274.0 IOPS]
Random Write 4KB (QD=32) : 134.663 MB/s [ 32876.6 IOPS]
Test : 100 MB [C: 35.4% (39.6/111.8 GB)] (x5)
Date : 2014/05/24 3:25:19
OS : Windows 7 Ultimate SP1 [6.1 Build 7601] (x64)
Benchmark from MSI Z87-G41 PC Mate (MS-750)
on SATA 3 port set to IDE
CrystalDiskMark 3.0.3 x64 (C) 2007-2013 hiyohiyo
Crystal Dew World
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]
Sequential Read : 181.472 MB/s
Sequential Write : 141.275 MB/s
Random Read 512KB : 177.430 MB/s
Random Write 512KB : 141.393 MB/s
Random Read 4KB (QD=1) : 21.646 MB/s [ 5284.6 IOPS]
Random Write 4KB (QD=1) : 68.922 MB/s [ 16826.7 IOPS]
Random Read 4KB (QD=32) : 25.411 MB/s [ 6203.9 IOPS]
Random Write 4KB (QD=32) : 108.275 MB/s [ 26434.3 IOPS]
Test : 100 MB [C: 35.4% (39.6/111.8 GB)] (x5)
Date : 2014/05/24 3:41:42
OS : Windows 7 Ultimate SP1 [6.1 Build 7601] (x64)
Benchmark from MSI Z87-G41 PC Mate (MS-750) **Replacement from RMA**
on SATA 3 port set to AHCI
CrystalDiskMark 3.0.3 x64 (C) 2007-2013 hiyohiyo
Crystal Dew World
* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]
Sequential Read : 469.045 MB/s
Sequential Write : 138.655 MB/s
Random Read 512KB : 419.083 MB/s
Random Write 512KB : 135.032 MB/s
Random Read 4KB (QD=1) : 26.454 MB/s [ 6458.5 IOPS]
Random Write 4KB (QD=1) : 89.189 MB/s [ 21774.7 IOPS]
Random Read 4KB (QD=32) : 252.818 MB/s [ 61723.0 IOPS]
Random Write 4KB (QD=32) : 129.909 MB/s [ 31716.1 IOPS]
Test : 100 MB [C: 37.1% (41.5/111.8 GB)] (x5)
Date : 2013/03/10 10:02:50
OS : Windows 7 Ultimate SP1 [6.1 Build 7601] (x64)

Problem running oracle 9i database in archivelog mode - database freezes

Greetings,
I recently needed to change a (test) database to archivelog mode to make online back-ups of this database. This posed no real problem although I seem to be unable to set the database to automatic archiving eventhough I edited the init.ora file (translation of the "archive log list" output between square brackets):
SQL> archive log list
Databaselogmodus Archiveermodus [Databaselogmode: Archivemode]
Automatisch archiveren Gedeactiveerd [Automatic archiving: Deactivated]
Archiveerbestemming O:\oracle\ora92\RDBMS [Archivedestionation: O:\oracle\ora92\RDBMS]
Oudste on-line logreeks 12306
Volgende logreeks voor archivering 12306
Huidige logreeks 12308
I added this to my init.ora file:
# Archvie Log Destinations
log_archive_start=TRUE
log_archive_dest_1=%ORACLE_HOME%\database\archive
log_archive_format="%%ORACLE_SID%%t_%s.arc"
However, this is not the real problem (maybe it has something to do with it, which is why I mention it aswell), the real problem is that my database freezes when the archive log file is "full". When the archive file reaches ~102.400Kb it just freezes up and I need to restart the database.
The following error is written to the alert_sid.log file:
Thu Apr 17 09:19:55 2008
Thread 1 cannot allocate new log, sequence 12309
All online logs needed archiving
Current log# 2 seq# 12308 mem# 0: O:\ORACLE\ORADATA\O\REDO02.LOG
The problem seems to be that the oracle service can't start a new logfile when the previous one is full. Does anybody know how I could fix this?
Thanks in advance,
Bram

Hello Maran, thanks for your quick response.
I added the output of archivelog list in the original post, but it's in dutch so here's the (loose) translation of the output:
SQL> archive log list
Databaselog mode Archive mode
Automatic archiving Deactivated
Archive destionation O:\oracle\ora92\RDBMS
Oldest on-line logsequence 12307
Next logsequence for archiving 12307
Current logsequence 12309
Maybe something that can help with the troubleshooting:
The archivelog file is written to O:\oracle\ora92\RDBMS but only AFTER the reboot, I've checked SYSTEM rights to the folder and it has full control.
Babu, thanks aswell for your quick response.
The location exists and space is available but the database doesn't seem to load (that part of) the ora.init file because the output of archive log list still refers to %ORACLE_HOME%\rdbms instead of %ORACLE_HOME%\database\archive.
I've now executed alter system archive log all; and am executing the import where the database usually freezes to see if it still happens. So far I already had this written to the alert_sid.log file after executing the command:
Completed: alter database open
Thu Apr 17 10:00:11 2008
ARCH: Evaluating archive log 1 thread 1 sequence 12307
ARCH: Beginning to archive log 1 thread 1 sequence 12307
Creating archive destination LOG_ARCHIVE_DEST_1: 'O:\ORACLE\ORA92\RDBMS\ARC12307.001'
ARCH: Completed archiving log 1 thread 1 sequence 12307
ARCH: Evaluating archive log 2 thread 1 sequence 12308
ARCH: Beginning to archive log 2 thread 1 sequence 12308
Creating archive destination LOG_ARCHIVE_DEST_1: 'O:\ORACLE\ORA92\RDBMS\ARC12308.001'
ARCH: Completed archiving log 2 thread 1 sequence 12308
And new log files were written to the directory (O:\oracle\ora92\RDBMS) and this time I didn't have to reboot for it to happen. Both were 100mb files without the database actually doing all that much though.
Message was edited by:
user616266

Database in Archivelog mode

Hi
All,
I have oracle 9.2.0.6 at my workplace.right now my database running in ARCHIVELOG MODE. I want to set it to NOARCHIVELOG MODE.
can I do on the fly? in other way, Do I need to shutdown and restart database?
Any help will be appreciated.
Thanks,
Vishal

Hi,
Issue the following commands to put a database into NOARCHVELOG mode:
1) Take Back up of Present SPfile by creating pfile
create pfile from present spfile.
2) Shutdown the database by SUTDOWN IMMEDIATE.
3) Take Cold backup of the database.
4) Change the parameter in the pfile.
log_archive_start = FALSE
#log_archive_dest_1 = 'LOCATION='Your location'
log_archive_dest_state_1 = DISABLE
#log_archive_format = %d_%t_%s.arc
5) And make a spfile from the modified pfile in default location .
6) Start the database with spfile.
SQL> CONNECT sys AS SYSDBA
SQL> STARTUP MOUNT ;
SQL> ALTER DATABASE ARCHIVELOG;
SQL> ARCHIVE LOG START;
SQL> ALTER DATABASE OPEN;
NOTE 1: Remember to take a baseline database backup right after disabling archivelog mode. Without it one would not be able to recover.
Regards
Jafar

Performance deteriorates with archivelog mode

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