How to setup redo logfile

I have Oracle 10g on Windows Server 2003. I need to set my redo log file to use 200MB to each group. Also, I need to setup 10groups. Need your assistance.

Dear mrp!
Please don't mind if I ask you about your knowlege about redo logs? Seems that you don't know much about it so I would suggest you to read the Oracle Onlinedocumentation about this topic. Never the less the answer to your question is not as easy as you might think.
1.) Every Redo Log Group consists of one or more memberbs. Oracle recommends to have a minimum of two memberms in each group. So my question to you is: Should every member have a size of 200M or should the whole group have a size of 200M?
2.) You told us that you want to configure 10 Groups. That would generate a very big of head (10 x 200 M of reado logs). Do you really really need 10 groups?
3.) Oracle suggest to multiplex the members of a group to more than one drive for security reasons. Have you thought about this?
Please answer these questions and read ab out online redo logs in the Oracle documentation. After that I may be able to help you.
Yours sincerely
Florian W.

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How to change redo log size in oracle 10g

Hi Experts,
Can anybody confirm how to change redo log size in oracle 10g?
Amit

Dear Amit,
You can enlarge the size of existing Online Redo log files, by adding new groups with different size of files (origlog$/mirrlog$) and then carefully droping the old groups with their associated inactive files.
Please refer SAP Note 309526 - Enlarging redo log files to perform the activity.
Steps to perform:
STEP-1. Analyze the exisiting situation and prepare an action plan.
A. You have to ensure that no more than one log switch per minute occurs during peak times.
It may also be necessary to increase the size of the online redo logs until they are large enough.
Too many log switches lead to too many checkpoints, which in turn lead to a high writing load in the I/O subsystem.
Use ST04 -> Additional Functions --> Display GV$-Views
There you can select
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> list the status(INACTIVE/CURRENT/ACTIVE) /size/sequence no. of existing online redolog files
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Group No.         Redo Log File Locations u201C/oracle/<SID>/u201D                  Size
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15                        log_g15m1.dbf         log_g15m2.dbf               100 MB
17                        log_g17m1.dbf            log_g17m2.dbf               100 MB
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16                       log_g16m1.dbf          log_g16m2.dbf            100 MB
18                       log_g18m1.dbf            log_g18m2.dbf            100 MB
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How to setup oracle database to archivelog mode and auto delete ?

Oracle 11g R2
- How to setup database to archive log mode and have oracle only save 24 hours of archive logs
and delete the rest. So at any given time I will have only 24 hours of archive log and not more.
So only 1 day of archive logs.
- Let me know the database parameters I need to setup to accomplish this.
- I don't want to use the RMAN
- I am not setting up the database to archive log mode for recovery purpose. I am setting up archive log mode
so we can use the log miner tool to dig up achives to see log activity for any performance & tuning.
Edited by: johnpau2013 on May 9, 2012 6:09 PM

johnpau2013 wrote:
Thanks everyone for there responses.
I need to rephrase and explain everyone as what I wanted to do exactly. This might help everyone understand and suggest me.
We have oracle database 11g r2. Its a test database. Nothing is critical. We use EXPDP utility to backup the entire database every night. Which is enough for us to recover incase something happens. Even if we loose some data. That's fine.
We are testing our web application on this oracle test database for performance & tuning.
One thing we have noticed is that the redo logs are switching very frequently. 50MB each log file and there are 5 logs. each log switches every 40 seconds. So we wanted to see what is getting written in this redo logs. We wanted to use the LOG MINER tool in OEM to read the logs. It needed our database to be setup in archive log mode. So the log miner can read the archive logs and show us the sql's within the archive logs.
Now when we setup the archive log mode on our database. By default the archive logs destination was set to flash recovery area ( may be oracle default archive log location is flash recovery area folder).
We have setup the db_recovery_file_dest_size to 100GB. Now within 2 days we have filled up the flash recovery area folder. Database was frozen. Then we realized that its because oracle couldn't write archive logs. Because it reached the 100GB. Then we physically deleted files in the flash recovery area folder. Thinking it would help us start the frozen oracle database. But it didn't . The we realized that we are doing something wrong. As Oracle does not know that at OS level we deleted the files. Then temporarily we changed the db_recovery_file_dest_size to 130GB and were able to start the oracle database. Later we turned OFF the archive log mode.
Being a rookie DBA we would have not read something properly.
Finally:
We wanted to know how to always keep only 1 day of archive logs (only for our performance tuning ) and not more than that. All we need this 1 day of archive logs is to use the log miner to read them. Backup is NOT our priority here. Only be able to read the archive logs from LOG MINER is PRIORITY.
Correct me if I am wrong.Okay, so its making much more sense now, thanks for explaining your requirement.
Database won't honor anything that you would do over the o/s without telling it. Your deletion of the archive log from the o/s location is NOT updated in the control file of the database and that's why, even when you had deleted the entire 100GB , from the db perspective, the space was still marked as used. This is the same which would happen even if you would increase the space from 100gb to whatever size as well. To delete the space, you would need to update the database's control file and that you can do from RMAN using its two commands , crosscheck backup following with deleted expired backup . The first command would find that which database backup files are NOT on the o/s which are shown in the control file and would mark all of them as expired. The second command would simply delete those expired files. This would update the control file and you would have your 100gb or whatever space, given back to you.
To keep the archive logs of just one day, set up that Retention Policy for RMAN to either number of copies using the Redundancy option(default and set to 1) or Recovery Window. I believe for you Redundancy would be a suitable choice but you can have a read and play around with it. Setting it up would mark the files as Obsoleted and finally, you can write a small RMAN script to delete those obsoleted files.
Now, what I don't understand is that why you want to keep on generating the archive logs just for the log miner? If you would have generated them once and figure out the reason for extensive redo generation(did you try increasing the redo log file size, 50mb seems to be smallish) , I don't think that there is any reason to keep on generating the archive logs still .
And last part, for your question asked about that whether we can use RMAN to put the db in the archive log and is it a backup tool, yes and yes.
HTH
Aman....

How to reduce redo space wait

os:x86_64 x86_64 x86_64 GNU/Linux
oracle:9.2.0.6
running : Data guard
Problem : Redo space wait is very high
Init.ora paramaeters
*.background_dump_dest='/u01/app/oracle/admin/PBPR01/bdump'
*.compatible='9.2.0'
*.control_files='/s410/oradata/PBPR01/control01.ctl','/s420/oradata/PBPR01/control02.ctl','/s430/oradata/PBPR01/control03.ctl'
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*.db_block_size=8192
*.db_cache_size=576000000
*.db_domain='cc.com'
*.db_file_multiblock_read_count=16
*.db_files=150
*.db_name='PBPR01'
*.db_writer_processes=1
*.dbwr_io_slaves=2
*.disk_asynch_io=false
*.fast_start_mttr_target=1800
*.java_pool_size=10485760
*.job_queue_processes=5
*.log_archive_dest_1='LOCATION=/s470/oraarch/PBPR01'
*.log_archive_dest_3='service=DR_PBPR01 LGWR ASYNC=20480'
*.log_archive_format='PBPR01_%t_%s.arc'
*.log_archive_start=true
*.log_buffer=524288
*.log_checkpoints_to_alert=true
*.max_dump_file_size='500000'
*.object_cache_max_size_percent=20
*.object_cache_optimal_size=512000
*.open_cursors=500
*.optimizer_mode='CHOOSE'
*.processes=500
*.pga_aggregate_target=414187520
*.replication_dependency_tracking=false
*.undo_management=AUTO
*.undo_retention=10800
*.undo_tablespace=UNDOTBS1
*.undo_suppress_errors=TRUE
*.session_cached_cursors=20
*.shared_pool_size=450000000
*.user_dump_dest='/u01/app/oracle/admin/PBPR01/udump'
SGA :
SQL> show sga
Total System Global Area 1108839248 bytes
Fixed Size 744272 bytes
Variable Size 520093696 bytes
Database Buffers 587202560 bytes
Redo Buffers 798720 bytes
SQL>
I created log groups with 2 memebers each and with size 25 mb.
Redo space waits shows as
SQL> SELECT name, value
FROM v$sysstat
WHERE name = 'redo log space requests';
NAME VALUE
redo log space requests 152797
this is running between 140000 and 160000
some of the trace file error
[oracle@hipclora6b bdump]$ cat PBPR01_lns0_23689.trc
Dump file /u01/app/oracle/admin/PBPR01/bdump/PBPR01_lns0_23689.trc
Oracle9i Enterprise Edition Release 9.2.0.6.0 - 64bit Production
With the Partitioning, OLAP and Oracle Data Mining options
JServer Release 9.2.0.6.0 - Production
ORACLE_HOME = /u01/app/oracle/product/9.2.0.6
System name: Linux
Node name: hipclora6b.clickipc.hipc.clickcommerce.com
Release: 2.4.21-37.EL
Version: #1 SMP Wed Sep 7 13:32:18 EDT 2005
Machine: x86_64
Instance name: PBPR01
Redo thread mounted by this instance: 1
Oracle process number: 34
Unix process pid: 23689, image: [email protected]
*** SESSION ID:(82.51071) 2008-04-14 23:40:04.122
*** 2008-04-14 23:40:04.122 46512 kcrr.c
NetServer 0: initializing for LGWR communication
NetServer 0: connecting to KSR channel
: success
NetServer 0: subscribing to KSR channel
: success
*** 2008-04-14 23:40:04.162 46559 kcrr.c
NetServer 0: initialized successfully
*** 2008-04-14 23:40:04.172 46819 kcrr.c
NetServer 0: Request to Perform KCRRNSUPIAHM
NetServer 0: connecting to remote destination DR_PBPR01
*** 2008-04-14 23:40:04.412 46866 kcrr.c
NetServer 0: connect status = 0
A Sample alert Log
Thread 1 advanced to log sequence 275496
Current log# 1 seq# 275496 mem# 0: /s420/oradata/PBPR01/redo01a.log
Current log# 1 seq# 275496 mem# 1: /s420/oradata/PBPR01/redo01b.log
Tue Apr 15 09:10:03 2008
ARC0: Evaluating archive log 4 thread 1 sequence 275495
ARC0: Archive destination LOG_ARCHIVE_DEST_3: Previously completed
ARC0: Beginning to archive log 4 thread 1 sequence 275495
Creating archive destination LOG_ARCHIVE_DEST_1: '/s470/oraarch/PBPR01/PBPR01_1_275495.arc'
Tue Apr 15 09:10:03 2008
Beginning global checkpoint up to RBA [0x43428.3.10], SCN: 0x0000.3c1594fd
Completed checkpoint up to RBA [0x43428.2.10], SCN: 0x0000.3c1594fa
Completed checkpoint up to RBA [0x43428.3.10], SCN: 0x0000.3c1594fd
Tue Apr 15 09:10:03 2008
ARC0: Completed archiving log 4 thread 1 sequence 275495
Tue Apr 15 09:29:15 2008
LGWR: Completed archiving log 1 thread 1 sequence 275496
Creating archive destination LOG_ARCHIVE_DEST_3: 'DR_PBPR01'
LGWR: Beginning to archive log 5 thread 1 sequence 275497
Beginning log switch checkpoint up to RBA [0x43429.2.10], SCN: 0x0000.3c15bc33
Tue Apr 15 09:29:16 2008
ARC1: Evaluating archive log 1 thread 1 sequence 275496
ARC1: Archive destination LOG_ARCHIVE_DEST_3: Previously completed
ARC1: Beginning to archive log 1 thread 1 sequence 275496
Creating archive destination LOG_ARCHIVE_DEST_1: '/s470/oraarch/PBPR01/PBPR01_1_275496.arc'
Tue Apr 15 09:29:16 2008
Thread 1 advanced to log sequence 275497
Current log# 5 seq# 275497 mem# 0: /s420/oradata/PBPR01/redo05a.log
Current log# 5 seq# 275497 mem# 1: /s420/oradata/PBPR01/redo05b.log
Tue Apr 15 09:29:16 2008
ARC1: Completed archiving log 1 thread 1 sequence 275496
Log file size
SQL> select GROUP#,MEMBERS ,sum(bytes)/(1024*1024) from v$log group by
2 GROUP#,MEMBERS;
GROUP# MEMBERS SUM(BYTES)/(1024*1024)
1 2 25
2 2 25
3 2 25
4 2 25
5 2 25
Pl. give your view what can be thought of to reduce redospace wait

Below are my suggestion:
Increase log buffer between [ 5Mb and 15Mb]
differ the the commit: COMMIT_WRITE=NOWAIT,BATCH
You can also increase your redo log fil, but read the following
Sizing Redo Logs with Oracle 10g
Oracle has introduced a Redo Logfile Sizing Advisor that will recommend a size for our redo logs that limit excessive log switches, incomplete and excessive checkpoints, log archiving issues, DBWR performance and excessive disk I/O. All these issues result in transactions bottlenecking within redo and performance degradation. While many DBAs' first thought is throughput of the transaction base, not very many give thought to the recovery time required in relation to the size of redo generated or the actual size of the redo log groups. With the introduction of Oracle's Mean Time to Recovery features, DBAs can now specify through the FAST_START_MTTR_TARGET initialization variable just how long a crash recovery should take. Oracle will then try its best to issue the proper checkpoints during normal system operation to help meet this target. Since the size of redo logs and the checkpointing of data have a key role in Oracle's ability to recover within a desired time frame, Oracle will now use the value of FAST_START_MTTR_TARGET to suggest an optimal redo log size. In actuality, the setting of FAST_START_MTTR_TARGET is what triggers the new redo logfile sizing advisor, and if you do not set it, Oracle will not provide a suggestion for your redo logs. If you do not have any real time requirement for recovery you should at least set this to its maximum value of 3600 seconds, or one hour and you will then be able to take advantage of the advisory. After setting the FAST_START_MTTR_TARGET initialization parameter a DBA need only query the V$INSTANCE_RECOVERY view for the column OPTIMAL_LOGFILE_SIZE value, in MEG, and then rebuild the redo log groups with this recommendation.
Simple query to show the optimal size for redo logs
SQL> SELECT OPTIMAL_LOGFILE_SIZE
FROM V$INSTANCE_RECOVERY
OPTIMAL_LOGFILE_SIZE
64
A few notes about setting FAST_START_MTTR_TARGET
•     Specify a value in seconds (0-3600) that you wish Oracle to perform recovery within.
•     Is overridden by LOG_CHECKPOINT_INTERVAL:
Since LOG_CHECKPOINT_INTERVAL requests Oracle to checkpoint after a specified amount of redo blocks have been written, and FAST_START_MTTR_TARGET basically attempts to size the redo logs in such a way as to perform a checkpoint when they switch, you can easily see that these two parameters are of conflicting interest. You will need to unset LOG_CHECKPOINT_INTERVAL if you wish to use the redo log sizing advisor and have checkpoints occur with log switches. This is how it was recommended to be done in the v7 days and really I can't quite see any reason for anything else.
•     Is overridden by LOG_CHECKPOINT_TIMEOUT:
LOG_CHECKPOINT_TIMEOUT controls the amount of time in between checkpoints if a log switch or the amount of redo generated has not yet triggered a checkpoint. Since our focus is now on Mean Time to Recovery (MTTR) this parameter is no longer of concern because we are asking Oracle to determine when to checkpoint based on our crash recovery requirements.
•     Is overridden by FAST_START_IO_TARGET:
Actually, the FAST_START_IO_TARGET parameter is deprecated and you should switch over to the FAST_START_MTTR_TARGET parameter
Thanks

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