Redo log groups/files on the local disk for RAC DB

Whether is it possible/supported to place redo log files/groups on the local disk for a RAC databases ?
Thank you,

Hi Mufalani,
are you sure about this one? I'd think that this only works as long as the nodes don't restart/crash. I can imagine this like this:
The nodes store redo logs on local disks which are NFS-exported to the other node. Everything should be fine. But when one node crashes/reboots, the other one has to perform crash recovery for the crashed instance but this won't work when the NFS mount (with redo logs) is unaccessible. So I would not want to do this.
Bjoern

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Abot loss online Redo log group

Hi,
Is there different from recovering between loss CURRENT online redo log group and ACTIVE online redo log group?
Both of them are needed to incomplete recovery, right?

For CURRENT redolog recovery:
startup mount
recover database until cancel;
alter database open resetlogs;
For ACTIVE redolog recovery:
If the database is still running, force a checkpoint by issuing the following command:
alter system checkpoint;
If above was successful and if the lost group has been archived then issue:
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Shared Disks For RAC

Hi,
I plan to use shared disks to create Oracle RAC using ASM. What options do I have? OCFS2? or any other option?
Can some one lead me to a documnet on how can I use the shared disks for RAC?
Thanks.

javed555 wrote:
I plan to use shared disks to create Oracle RAC using ASM. What options do I have? You have two options:
1. Create shared virtual, i.e. file-backed disks. These files will be stored in /OVS/sharedDisk/ and made available to each guest
2. Expose physical devices directly to each guest, e.g. an LVM partition or a multipath LUN.
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Usage of Redo Log Groups & Disk Contention

Hi,
I have a peculiar problem here.
I have the redo log groups/members configured in the following manner.Please note that the disks are in the A-B-A-B-A-B sequence for successive redo groups.
GROUP#      MEMBER
11      /origlogA/log_g11m1.dbf
11      /mirrlogA/log_g11m2.dbf
12      /origlogB/log_g12m1.dbf
12      /mirrlogB/log_g12m2.dbf
13      /origlogA/log_g13m1.dbf
13      /mirrlogA/log_g13m2.dbf
14      /origlogB/log_g14m1.dbf
14      /mirrlogB/log_g14m2.dbf
15      /origlogA/log_g15m1.dbf
15      /mirrlogA/log_g15m2.dbf
16      /origlogB/log_g16m1.dbf
16      /mirrlogB/log_g16m2.dbf
17      /origlogA/log_g17m1.dbf
17      /mirrlogA/log_g17m2.dbf
18      /origlogB/log_g18m1.dbf
18      /mirrlogB/log_g18m2.dbf
19      /origlogA/log_g19m1.dbf
19      /mirrlogA/log_g19m2.dbf
20      /origlogB/log_g20m1.dbf
20      /mirrlogB/log_g20m2.dbf
21      /origlogA/log_g21m1.dbf
21      /mirrlogA/log_g21m2.dbf
22      /origlogB/log_g22m1.dbf
22      /mirrlogB/log_g22m2.dbf
23      /origlogA/log_g23m1.dbf
23      /mirrlogA/log_g23m2.dbf
24      /origlogB/log_g24m1.dbf
24      /mirrlogB/log_g24m2.dbf
But oracle uses these groups in a zig-zag manner(pls refer the list below).Here, after group# 15, it is group# 11 , which is used. And the members of these two groups are in the same set of disks ie; "/origlogA and /mirrlogA"
(Note:The following result is ordered by sequence #)
GROUP# SEQUENCE#      MEMBER
16      263076           /origlogB/log_g16m1.dbf
16      263076           /mirrlogB/log_g16m2.dbf
17      263077           /origlogA/log_g17m1.dbf
17      263077           /mirrlogA/log_g17m2.dbf
18      263078           /origlogB/log_g18m1.dbf
18      263078           /mirrlogB/log_g18m2.dbf
19      263079           /origlogA/log_g19m1.dbf
19      263079           /mirrlogA/log_g19m2.dbf
20      263080           /origlogB/log_g20m1.dbf
20      263080           /mirrlogB/log_g20m2.dbf
21      263081           /origlogA/log_g21m1.dbf
21      263081           /mirrlogA/log_g21m2.dbf
22      263082           /origlogB/log_g22m1.dbf
22      263082           /mirrlogB/log_g22m2.dbf
23      263083           /origlogA/log_g23m1.dbf
23      263083           /mirrlogA/log_g23m2.dbf
24      263084           /origlogB/log_g24m1.dbf
24      263084           /mirrlogB/log_g24m2.dbf
13      263085           /origlogA/log_g13m1.dbf
13      263085           /mirrlogA/log_g13m2.dbf
14      263086           /origlogB/log_g14m1.dbf
14      263086           /mirrlogB/log_g14m2.dbf
15      263087           /origlogA/log_g15m1.dbf
15      263087           /mirrlogA/log_g15m2.dbf
11      263088           /origlogA/log_g11m1.dbf
11      263088           /mirrlogA/log_g11m2.dbf
12      263089           /origlogB/log_g12m1.dbf
12      263089           /mirrlogB/log_g12m2.dbf
Is there anyway, which we can force oracle to use the log groups in the right succession of log groups ? (like 11-12-13-14-15-16-17-18-19-20 etc.).
I want to make sure that there will be no chances of contention, due to the "archiving of the offline redo log & LGWR writing to the online redo log" happening on the same disk.
Thanks in advance,
Don

Hi,
There's no way to achieve what you're trying to do except:
1/ switch logfile till the current group is the last one.
2/ drop groups from 1 to (last - 2)
3/ create groups 1, 2, 3 (or 11, 12, 13, 14, ... don't care)
4/ Switch logfile Twice
5/ Alter system checkpoint
6/ Drop the former 2 or 3 remaining groups (19, 20, 21, ...)
7/ Recreate them.
But i'd like to point that having them go in order is perfectly useless.
And that you're a priori doing something dangerous. Having your log members on the same disk for the different groups. usually I'd choose to
. Put member 1 on disk 1
. Put member 2 on disk 2
. Increase the number of archiver processes
. ensure disk 1 and 2 are not RAID disk(click)
Regards,
Yoann.

"file not on the local disk" warning when it absolutely is

Using DreamweaverCC2014 for the first time. Working on an older MacPro running Yosemite.
I define a new site, specifying the directory in which my site's files are stored. The site has a single page, called index.htm, in the root directory, which has a link to a CSS stylesheet named "main.css" in a directory called "_css." The CSS file is contained within the directory, and appears in the Files tab of Dreamweaver as expected. The link to the stylesheet is properly formed on the index.htm page.
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As this issue was diminishing my confidence in using the software for a mission-critical project, I contacted Adobe technical support for assistance.
This is a known issue.
The problem has to do with DW getting "confused" if there is any other file in the site root disk that may have the same name. In my case, there was (I tend to name the CSS files for my sites with the terribly generic "main" designation). The rep suggested that I create an entirely new site root, put my file structure into that, and see if the problem resolves. I did two things:
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So, I hope that my experience (and the solution) is helpful in the event others encounter this same issue. Again, this is a known issue at Adobe, so chances are good one of you out there will have this problem. The solution is to place your files in a completely new site root apart from any other that might have similar file names, so as not to "confuse" DW.

Deleting the old Archive Log Files from the Hard Disk

Hello All,
I want to delete the old archive files of Oracle. These files are very old and consuming very huge disk space.
Is there any way by which I can delete these files from the Hard Disk?
Can I directly delete them using the Operating System Command?
Will it cause any dilfference to the normal functioning of my Database?
If I need to delete these files, do I need to bring the database down?
Please guide me.
I need to do this activity to make some space free on the Hard Disk.
Thanks in advance.
Himanshu

Hi.
Keep archived logs from time of last backup and forward to currenct time on disk together with the backup itself. And keep older archived logs together with older warm/cold backupfiles on tape as long as there is enough capasity or following your recovery strategy. This way you might be able to roll forward a recovery without restoring these files from tape which often the faster.
Older archived logs can be deleted manually, with scheduled OS script or automatically with RMAN.
Good luck
rgds
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I am a developer in Web Flash Game.( I use AS3.0 )
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I want to know the other techniques of only using AS3.0.)

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Redo Log Groups

Call me stupid, but for some reason I've decided to get certified as a DBA even though I have always been a developer. Honestly, its not my fault. The choices in the development track are pretty boring...
Anyway, while pouring through the Backup/Recovery documentation, I run across this:
Every database must have at least two online redo log groups.
Each redo log group contains at least one online redo log member,
which is a physical file containing the redo records.I decided to check and see if I have "at least two online redo log groups" for my play database. Now, I am very very confused.
I think this query shows my 3 log members, but for some reason the 1st column makes me think I have 3 log groups:
select group#, member from v$logfile
    GROUP# MEMBER
         3 /var/opt/oracle/oradata/db92/redo03.log
         2 /var/opt/oracle/oradata/db92/redo02.log
         1 /var/opt/oracle/oradata/db92/redo01.logI only know of one place where my online redo is located:
ls $ORACLE_BASE/oradata/db92
redo01.log redo02.log redo03.logCan someone help me figure out if I have one-group and three-members??
Any comments are welcome,
Stan

This information can help you:
Adding Redo Log File Groups: Examples
The following statement adds a redo log file group with two members and identifies it with a GROUP parameter value of 3:
ALTER DATABASE
ADD LOGFILE GROUP 3
('diska:log3.log' ,
'diskb:log3.log') SIZE 50K;
The following statement adds a redo log file group containing two members to thread 5 (in a Real Application Clusters environment) and assigns it a GROUP parameter value of 4:
ALTER DATABASE
ADD LOGFILE THREAD 5 GROUP 4
('diska:log4.log',
'diskb:log4:log');
Dropping Log File Members: Example
The following statement drops one redo log file member added in the previous example:
ALTER DATABASE
DROP LOGFILE MEMBER 'diskb:log3.log';
The following statement drops all members of the redo log file group 3:
ALTER DATABASE DROP LOGFILE GROUP 3;
Adding Redo Log File Group Members: Example
The following statement adds a member to the redo log file group added in the previous example:
ALTER DATABASE
ADD LOGFILE MEMBER 'diskc:log3.log'
TO GROUP 3;
Renaming a Log File Member: Example
The following statement renames a redo log file member:
ALTER DATABASE
RENAME FILE 'diskc:log3.log' TO 'diskb:log3.log';
The preceding statement only changes the member of the redo log group from one file to another. The statement does not actually change the name of the file 'diskc:log3.log' to 'diskb:log3.log'. You must perform this operation through your operating system.
Joel P�rez

Why multiplex redo log group ?

Hello,
Why should we multiplex redo log groups if we have only file system which is already mirrored. Is there any one who had an incident when he has only one redo log member per group placed on a mirrored file system but still got corrupted and he felt better to have multiple members even if they reside on the same file system (which is mirrored)
Thanks
Salman

Ansiktet wrote:
EdStevens wrote:
Salman Qureshi wrote:
Hello,
Why should we multiplex redo log groups if we have only file system which is already mirrored. Is there any one who had an incident when he has only one redo log member per group placed on a mirrored file system but still got corrupted and he felt better to have multiple members even if they reside on the same file system (which is mirrored)
Thanks
SalmanThe mirror won't protect you from an SA who deletes '/u01/oradata/redo01.log' because he is running out of space on /u01 and figures its safe to delete a log file.
Or similar types of errors.
The redo and control files are simply too critical to put all your eggs in one basket when planning their protection.:) Thats why you should not use Oracle default .log on redo, instead .dbf or .dbl can be used. THat's why I use the older (pre-10g) default of .rdo for redo logs
However, has this happend anyone for real, that a SA delete Oracle files? Where do you think I came up with the example?
HOw about an SA (or maybe the kind of "fresher" we often see here, Taking a look at a "log" file with notepad?
If he is isnt stupid he should know that Oracle resides on /u01 partion (for example), and should not delete files there without consulting the DBA."should" is the operative word there. There is no accounting for corporate cultures and attitudes.
But end the end, my example was to illustrate that not all problems with redo and control files are mitigated with disk mirroring.

Redo log groups on ASM

Hi All
Is there any difference between creating redo log groups on ASM and creating the same redo log groups on Cluster file system ? if yes , can you please give me an example ?
Thanks

ASM supports redo log files like cluster filesystems. But as far as I know Oracle strongly recommends to place redo log files on different physical disks than the datafiles and the archivelogs also. So if you are planning to place your redo logs on the ASM maybe it is better to create a seperate ASM diskgroup.
ASM also has the ability to stripe and mirror the disks under a diskgroup so this functionality also gives you better performance according to the configuration you already have or planning to have. Of course it depends on your cluster disk infrastructure and ASM infrastructure also.
You should also check the configuration of the storage and the LUN architecture to avoid double stripe issues.

Confused about standby redo log groups

hi masters,
i am little bit confuse about creating redo log group for standby database,as per document number of standby redo group depends on following equation.
(maximum number of logfiles for each thread + 1) * maximum number of threads
but i dont know where to fing threads? actually i would like to know about thread in deep.
how to find current thread?
thanks and regards
VD

is it really possible that we can install standby and primary on same host??
yes its possible and i have done it many times within the same machine.
For yours confusion about spfile ,i agree document recommend you to use spfile which is for DG broker handling if you go with DG borker in future only.
There is no concern spfile using is an integral step for primary and standby database implementation you can go with pfile but good is use spfile.Anyhow you always keep pfile on that basis you created spfile,i said you make an entry within pfile then mount yours standby database with this pfile or you can create spfile from this pfile after adding these parameter within pfile,i said cause you might be adding this parmeter from SQL prompt.
1. logs are not getting transfered(even i configure listener using net manager)
2.logs are not getting archived at standby diectory.
3.'ALTER DATABASE RECOVER MANAGED STANDBY DATABASE DISCONNECT FROM SESSION' NEVER COMPLETE ITS RECOVERY
4. when tried to open database it always note it 'always' said system datafile is not from sufficiently old backup.
5.i tried 'alter database recover managed standby database camncel' also.Read yours alert log file and paste the latest log here..
Khurram

Standby redo log group for particular thread

hi masters,
actually i am performing an experiment to create physical standbyt database on the same machine as my primary database.
i ma going according to 'data guard admin guide'. while section for ading standby redo log group,it says that you have to add standby redo log group to "thread"....
what is this thread? and how can i foind to which thread i have to assign the next redo log group??
how can i find current thread??
what if i dont add "to thread' clause in my statement:-
ALTER DATABASE ADD STANDBY LOGFILE THREAD 5
2> ('/oracle/dbs/log1c.rdo','/oracle/dbs/log2c.rdo') SIZE 500M;
thanks and regards
VD

Vikrant,
First a question: Do you have a RAC instance? If so the paragraph even doesn't apply to you and I'm not sure why you are questioning it.
Secondly
"The THREAD clause is required only if you want to add one or more standby redo log
file groups to a specific primary database thread. If you do not include the THREAD
clause and the configuration uses Real Application Clusters (RAC), Data Guard will
automatically assign standby redo log file groups to threads at runtime as they are
needed by the various RAC instances."
this means you dont have to specify thread for RAC,as it will allocate one according to current thread.
Your conclusion is incorrect.
Where do you read the word 'current'?
Oracle will likely simply make sure each instance has sufficient standby redolog groups, the requirement is 1 standby redolog group per group + 1 extra.
Sybrand Bakker
Senior Oracle DBA

Online redo log group needed??

hey guys!
Am about to recreate the clone file of the clone db, open it using recover it until cancel using backup controlfile and apply all necessary archive logs!
My question is, does ai need to have online redo log group of the production db? since ai have all the archive log, so ai think while recraeting the control file, online redo log group will be created too?
Thanks!

while recraeting the control file, online redo log group will be created tooWhile creating control file, online redo log group doesn't get created. After applying all the archivel logs you have to open the database with RESET LOG option and then oracle will create redo logs for you.
Best of Luck !!
Daljit Singh

Redo Logs Groups and Members

Hi -
I have a few questions regarding redo log groups and naming conventions I was hoping someone could address or point me to some docs.
I am multiplexing my control file and redo logs across HDDs for an XE installation.
The original logs created at install have the naming form of:
O1_MF_1_462H1GK7_.LOG.
1. What is behind the naming scheme (specifically the _462H1GK7_ section)?
2. Is there a generally recognized naming scheme for adding new group members in XE?
3. I noticed that with any XE install I have done, the redo logs groups default to Group 1 and Group 3, with no Group 2 to be found. Is this normal/required? If not, is it best to add group 2 and then remove group 3? I'm not sure if has much bearing here, but the 10gR2 docs state that skipping group numbers will consume space in the control files.
Thanks in advance for any assistance,
Scott

The odd-looking filename is from using Oracle Managed Files (OMF). You can override the naming scheme or create your own groups and members. Very common to include "redo" in the file name along with group and member identifiers. An example would be:
<path>/redo01a.log
<path>/redo01b.log
<path>/redo02a.log
etc.
You can see group 01 has two members, a and b. Can also include the SID in the file name as well, but that can be identified via the path. 462H1GK7 is a unique identifier generated by Oracle. It has no meaning.
I don't know about XE not creating a group 2. Were there group 2 file(s) left over from a previous install (although the OMF probably would have ignored the existing files)? If creating the files manually, you can use "reuse" to use existing files.

Redo log groups/files on the local disk for RAC DB

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