difference between redo log .rdo .log extension

Dear Sir.

There is a difference in the speed o If we create the log to roll forward with .rdo or .log extension?

Kind regards

Previous versions of db Oracle used to talk about the extension as *.rdo but now its *. log. But whatever the extension, it makes no difference in the work. You can even do *.txt, there would still be a Redo Log files.

Aman...

Tags: Database

Similar Questions

What is the difference between vmware.log vmware - 1.log, vmware - 2.log... Why are there different logs created

Experts of HI, need some advice what is the difference between vmware.log vmware - 1.log, vmware - 2.log... Why are there different logs created. I understand the vmware.log is to check when the VM not suite or something, but not sure the rest feed files. Thank you

Log files are rotated once a virtual computer is turned on or when the file reaches a certain size. The vmware.log (without number) is the current log file. By default, the old files are kept for purposes of troubleshooting. You can - even if I do not - recommend disable this behavior, or even configure the virtual machine to do not create the log files at all.

André

PS: I forgot to attach the KB article: http://kb.vmware.com/kb/8182749

Difference between redo logfiles, Undo Tablespace, Archive log data file
Can some please highlight the difference between Undo and Redo Logs
Also why we need to separate the archive logs when the recovery log data can be written directly in data files...

Help you will be highly appreciated...
Hello

Ed gave you a very good answer.

Rememeber database files are online and they are written to by DBWR process. So we have the database files, redo log files and archive logs.
In order to avoid all the crawl log when you perform a recovery, database performs control points that summarize the State of the database. This operation of control point provides a shortcut to the recovery. At the checkpoint, the database knows that all incorrect pages were written to disk (for example, database files). At the time of recovery, the log (which includes-finished and unfinished transactions) is used to bring the database to a consistent state. The system locates the time of the last checkpoint and returned to this position in the log file. Then he restores forward all completed transactions (read committed) that occurred after the last checkpoint and rolls back all transactions that were not committed, but that began before the last checkpoint. This is where online log files are used.

Now imagine that you need to back up your database GB 100 + all 10 minutes. It would be a waste of space! So you take a backup of your database at time t and backups of archiver process redo logs periodically to check the newspapers so that redo log files can be replaced and RMAN will use the last backup and archive the log files to recover your database at the time.

Now, I mentioned the checkpoint process. The Checkpoint process regularly launches a control point that uses DBWR to rewrite all the blocks Sales in the data files, so synchronize the database. Imagine one dam is running and have exhausted all the redo log files. At this point, Oracle will wait until all Sales already queued blocks have been written to the buffer on disk (database files) foremost him redo log files can be considered as superfluous and available for re-use (i.e. can be overwritten). This will result in the following message in the alert.log:
```
Thread 1 advanced to log sequence 17973
  Current log# 3 seq# 17973 mem# 0: /oracle/data/HAM1/log3aHAM1.dbf
  Current log# 3 seq# 17973 mem# 1: /oracle/data/HAM1/log3bHAM1.dbf
Thread 1 cannot allocate new log, sequence 17974
Checkpoint not complete
  Current log# 3 seq# 17973 mem# 0: /oracle/data/HAM1/log3aHAM1.dbf
  Current log# 3 seq# 17973 mem# 1: /oracle/data/HAM1/log3bHAM1.dbf
Thread 1 advanced to log sequence 17974
```
I am sure you have done the following:
```
alter database mount;

Database altered.
```
When you mount a database, Oracle combines the instance started the database. Oracle control files are opened and read. However, no checking such as the restore/recovery is performed
```
alter database open;

Database altered.
```
An open command opens the data files, recovery logs, it performs automatic and consistency of database recovery. At this point, the database is now ready to be used by all valid users.

HTH,

Mich

Published by: Mich Talebzadeh on November 19, 2011 16:57

relationship between redo log buffer, journal of redo and undo tablespace files
What is the relationship between the redo log buffer, redo log files and undo tablespace?

what I understand is

redo log buffer is the logical area where all the news of recovery were stored until they are transferred by LGWR bank roll forward log online... but y at - it report any with the undo tablespace with these two?

Please correct me if I'm wrong

Thanks in advance
redo log buffer is the logical area where all the news of recovery were stored until they are transferred by LGWR bank roll forward log online... but y at - it report any with cancellations

tablespace with these two?

There is a link between files redo log and buffer, but the undo tablespace is something else entirely.

spend it here with this links

REDO LOG FILES
http://www.DBA-Oracle.com/concepts/redo_log_files.htm

BUFFER REDOLOG
http://www.DBA-Oracle.com/concepts/redo_log_buffer_concepts.htm

UNDO TABLESPACE
Undo tablespace to cancel files to undo or roll back uncommitted changes pray the database.

Hope you understood.

difference between .rman and .rcv file extension?
What is the difference between .rman and .rcv extension. According to what I understand you can run only two extensions using RMAN of files using cron. Is it typo? Or am I wrong?

Thank you.
What is the difference between .rman and .rcv extension. According to what I understand you can run only two extensions using RMAN of files using cron. Is it typo? Or am I wrong?

ORACLE does not care the files extension. Same control/data/redo or any other scripting RMAN. You too keep file as "full_backup.aymanzone". No problems.

But makesure the file name and extension you created. Is the same that you use/run.

difference between online redolog files and archived log files
What is the fundamental difference between archived log files and online redo log files? .. .plz keep things simple as m a newbie
Online redo log:

Redo online Oracle log files are filled with records of restoration by progression. A record of remake, also called entrance to roll forward, is composed of a group of agents of change, each of which is a description of a change to a single block in the database. Each instance of an Oracle database has an associated online redo log to protect data in case of failure of the instance.

See here,
http://download.Oracle.com/docs/CD/B10500_01/server.920/a96521/onlineredo.htm

Archived redo log:

Oracle Database allows you to save files to one or more destinations offline newspapers filled with repeat groups, known collectively as the archived redo log. An archived redo log file is a copy of one of the members of a group of redo log filled.

See here,
http://download.Oracle.com/docs/CD/B19306_01/server.102/b14231/archredo.htm

Thank you

difference between switch logfile and checkpoint
Hi all
What is the difference between
Forcing log switches:
ALTER SYSTEM switch logfile;

and
ALTER SYSTEM checkpoint;

When I use one and don't use the other

Thank you very much
Its similar comparison mangoes with tomatoes. Checkpoint is a number that is used to make sure that everything is in harmony with the other data files, control files. They are used in different places for different reasons.
The newspaper fles, as mentioned by Satish, Siwtching is used when it is necessary to create a log file to archive. The only link between this and the control point is that this event causes also point of control and full control point to arrive.
HTH
Aman...

Difference between log sales and Complex Event Processing
Dear all,

Can anyone let me know the difference between

Business-> http://docs.oracle.com/cd/E21764_01/integration.1111/e10224/obe_intro.htm#CHDIBHBE event

and

Complex Event Processing-> http://docs.oracle.com/cd/E21764_01/ doc.1111 /e14476/Overview.htm#g1024628

Here are 2 identical?

Thank you
Hello.
Complex event processing (CEP) server is a complete product.
Business Event/event delivery network is just a part of email/event of the SOA Infrastructure component.

So, if you are interested on the correlation of events from different sources, high performance on the analysis of these events plus operations among the data generated on these events, CEP is your option.
Hope this helps

Difference between the SNA and log sequence number
Hi all

Please, is there a difference between the number of number (SCN) and sequence of journal system change ?

Thank you.
Query V$ LOG_HISTORY or V$ ARCHIVED_LOG
```
select sequence#, first_change# from v$log_history order by 1;
select sequence#, first_change# from v$archived_log order by 1;
```
Hemant K Collette
http://hemantoracledba.blogspot.com

What is the purpose of waiting for redo log files
Hello

What is the purpose of the log files waiting for redo in the Dr?

What happens if the standby redo log files are created? or else is not created?

Please explain

Thank you
Re: what is the difference between onlinelog and standbylog

I mentioned the goal of the eve of the redo log in RD files in above thread.

Concerning
Girish Sharma

Redo log and members groups
Hi I got very confused by looking at the documentation of redo log groups and members of 11g.

Please could someone help me with that?

-What is the difference between a group of newspapers of restoration by progress and members within the Group?

-How does add a member help protect / multiplex a group?

-I am course I've read that if all members of the current redo log group are damaged, then 2 other groups does not bring the database back to how it was? ... so what's the point of having them?

Any help would be appreciated
806595 wrote:
OK thanks, so again an allows for example, we had only one newspaper group and the database was NOT in archivelog mode, once the newspaper filled redo id, it would be re-written and proevious changes would be lost?

Before you start, don't forget not that whenever you would need redolog groups, this will be the mandatory requirement, 2:1, and that means that 2 groups of newspaper with 1 member of each. Now, the newspaper group is a logic thing. There is no such thing actually exists. His way to the club/join/merge/combine/group multiple and physics redo log files that are written together. A minimum of a physical member is a must in a group, therefore 2:1.

Now, groups of newspapers (and in their midst, the log files are in fact) are written sequentially by LGWR, which means that LGWR would write about a group and all its members at the same time, fill it out completely and then made a switch (called a LOG SWITCH) to the next group of inactive log and keeps current processes. This is why a minimum of paper two groups are needed for the LGWR to work. The ius of work done on a single group and when the switch happens, work of the previous, filled will be controlled for the data files and will be marked as inactive thereafter, which makes even elgible for the LGWR to write to.

HTH
Aman...

Waiting for redo log file missing when restore main database using RMAN backup that was taken on the database physical standby

Here's my question after tons of research and test without have the right solutions.
Target:
(1) I have a 12.1.0.2 database unique main enterprise 'testdb' as database instance running on the server "node1".
(2) I created physical standby database "stbydb" on the server "node2".
(3) DataGuard running on the mode of MaxAvailability (SYNC) with roll forward in real time 12 default c apply.
(4) primary database has 3 groups of one-man redo. (/oraredo/testdb/redo01.log redo02.log redo03.log)
(5) I've created 4 standby redo logfiles (/oraredo/testdb/stby01.log stby02.log stby03.log stby04.log)
(6) I do RMAN backup (database and archivelog) on the site of relief only.
(7) I want to use this backup for full restore of the database on the primary database.
He is a DR test to simulate the scenario that has lost every primary & Eve total servers.
Here is how to save, on the database pending:
(1) performance 'alter database recover managed standby database Cancel' to ensure that compatible data files
(2) RMAN > backup database;
(3) RMAN > backup archivelog all;
I got elements of backup and copied to primary db Server something like:
/Home/Oracle/backupset/o1_mf_nnndf_TAG20151002T133329_c0xq099p_.BKP (data files)
/Home/Oracle/backupset/o1_mf_ncsnf_TAG20151002T133329_c0xq0sgz_.BKP (spfile & controlfile)
/Home/Oracle/backupset/o1_mf_annnn_TAG20151002T133357_c0xq15xf_.BKP (archivelogs)
So here's how to restore, on the main site:
I clean all the files (data files, controlfiles oder all gone).
(1) restore spfile from pfile
RMAN > startup nomount
RMAN > restore spfile from pfile ' / home/oracle/pfile.txt' to ' / home/oracle/backupset/o1_mf_ncsnf_TAG20151002T133329_c0xq0sgz_.bkp';
(2) modify pfile to convert to db primary content. pFile shows below
*.audit_file_dest='/opt/Oracle/DB/admin/testdb/adump '
* .audit_trail = "db".
* full = '12.1.0.2.0'
*.control_files='/oradata/testdb/control01.ctl','/orafra/testdb/control02.ctl'
* .db_block_size = 8192
* .db_domain = "
*.db_file_name_convert='/testdb/','/testdb /'
* .db_name = "testdb".
* .db_recovery_file_dest ='/ orafra'
* .db_recovery_file_dest_size = 10737418240
* .db_unique_name = "testdb".
*.diagnostic_dest='/opt/Oracle/DB '
* .fal_server = "stbydb".
* .log_archive_config = 'dg_config = (testdb, stbydb)'
* .log_archive_dest_2 = "service = stbydb SYNC valid_for = (ONLINE_LOGFILE, PRIMARY_ROLE) db_unique_name = stbydb'"
* .log_archive_dest_state_2 = 'ENABLE '.
*.log_file_name_convert='/testdb/','/testdb /'
* .memory_target = 1800 m
* .open_cursors = 300
* runoff = 300
* .remote_login_passwordfile = "EXCLUSIVE."
* .standby_file_management = "AUTO".
* .undo_tablespace = "UNDOTBS1.
(3) restart db with updated file pfile
SQLPLUS > create spfile from pfile='/home/oracle/pfile.txt'
SQLPLUS > the judgment
SQLPLUS > startup nomount
(4) restore controlfile
RMAN > restore primary controlfile to ' / home/oracle/backupset/o1_mf_ncsnf_TAG20151002T133329_c0xq0sgz_.bkp';
RMAN > change the editing of the database
(5) all elements of backup catalog
RMAN > catalog starts by ' / home/oracle/backupset / '.
(6) restore and recover the database
RMAN > restore database;
RMAN > recover database until the SNA XXXXXX; (this YVERT is the maximum in archivelog backups that extends beyond the scn of the backup of the data file)
(7) open resetlogs
RMAN > alter database open resetlogs;
Everything seems perfect, except one of the file log roll forward pending is not generated
SQL > select * from v$ standby_log;
ERROR:
ORA-00308: cannot open archived log ' / oraredo/testdb/stby01.log'
ORA-27037: unable to get file status
Linux-x86_64 error: 2: no such file or directory
Additional information: 3
no selected line
I intended to use the same backup to restore primary basic & helps record traffic and the downtime between them in the world of real output.
So I have exactly the same steps (except STANDBY restore CONTROLFILE and not recover after database restore) to restore the database pending.
And I got the same missing log file.
The problem is:
(1) complete alert.log filled with this error, not the concern here
(2) now repeat it in real time apply won't work since the Party shall LGWR shows always "WAITING_FOR_LOG."
(3) I can't delete and re-create this log file
Then I tried several and found:
The missing standby logfile was still 'ACTIVE' at present RMAN backup was made.
For example, on db standby, under Group #4 (stby01.log) would be lost after the restoration.
SQL > select GROUP #, SEQUENCE #, USE (s), the STATUS from v$ standby_log;
GROUP # SEQUENCE # USED STATUS
---------- ---------- ---------- ----------
4 19 ACTIVE 133632
5 0 0 UNASSIGNED
6 0 0 not ASSIGNED
7 0 0 UNASSIGNED
So until I take the backup, I tried on the primary database:
SQL > alter system set log_archive_dest_state_2 = delay;
This was the Group of standby_log side Eve #4 was released:
SQL > select GROUP #, SEQUENCE #, USE (s), the STATUS from v$ standby_log;
GROUP # SEQUENCE # USED STATUS
---------- ---------- ---------- ----------
4 0 0 UNASSIGNED
5 0 0 UNASSIGNED
6 0 0 not ASSIGNED
7 0 0 UNASSIGNED
Then, the backup has been restored correctly without missing standby logfile.
However, to change this primary database means break DataGuard protection when you perform the backup. It's not accept on the production environment.
Finally, my real questions come:
(1) what I do may not do on parameter change?
(2) I know I can re-create the control file to redo before delete and then recreate after. Is there any simple/fast to avoid the standby logfile lost or recreate the lost one?
I understand that there are a number of ways to circumvent this. Something to keep a copy of the log file waiting restoration progress and copy up one missing, etc, etc...
And yes I always have done no real-time applies "to the aid of archived logfile" but is also not accept mode of protection of production.
I just want proof that the design (which is displayed in a few oracle doc Doc ID 602299.1 is one of those) that backs up data backup works effectively and can be used to restore the two site. And it may be without spending more time to resume backups or put the load on the primary database to create the database before.
Your idea is very much appreciated.
Thank you!

Hello

1--> when I take via RMAN backup, RMAN does not redo log (ORL or SRL) file, so we cannot expect ORLs or SRL would be restored.

2nd--> when we opened the ORL database should be deleted and created

3rd--> Expecting, SRL should not be an issue.we should be able to do away with the fall.

DR sys@cdb01 SQL > select THREAD #, SEQUENCE #, GROUP #, STATUS from v$ standby_log;

THREAD # SEQUENCE # GROUP # STATUS

---------- ---------- ---------- ----------

1 233 4 ACTIVE

1 238 5 ACTIVE

DR sys@cdb01 SQL > select * from v$ logfile;

GROUP # STATUS TYPE MEMBER IS_ CON_ID

---------- ------- ------- ------------------------------ --- ----------

3 /u03/cdb01/cdb01/redo03.log no. 0 online

/U03/cdb01/cdb01/redo02.log no. 0 2 online

1 /u03/cdb01/cdb01/redo01.log no. 0 online

4 /u03/cdb01/cdb01/stdredo01.log WATCH No. 0

/U03/cdb01/cdb01/stdredo02.log EVE 5 No. 0

DR sys@cdb01 SQL > ! ls - ltr /u03/cdb01/cdb01/stdredo01.log

method: cannot access the /u03/cdb01/cdb01/stdredo01.log: no such file or directory

DR sys@cdb01 SQL >! ls - ltr /u03/cdb01/cdb01/stdredo02.log

-rw - r-. 1 oracle oinstall 52429312 17 Oct 15:32 /u03/cdb01/cdb01/stdredo02.log

DR sys@cdb01 SQL > alter database force claire logfile 4;

change the database group claire logfile 4

*

ERROR on line 1:

ORA-01156: recovery or current flashback may need access to files

DR sys@cdb01 SQL > alter database recover managed standby database cancel;

Database altered.

DR sys@cdb01 SQL > change the database group claire logfile 4;

Database altered.

DR sys@cdb01 SQL > ! ls - ltr /u03/cdb01/cdb01/stdredo01.log

-rw - r-. 1 oracle oinstall 52429312 17 Oct 15:33 /u03/cdb01/cdb01/stdredo01.log

DR sys@cdb01 SQL >

If you do, you can recreate the controlfile without waiting for redo log entry...

If you still think it's something is not acceptable, you must have SR with support to analyze why he does not abandon SRL when controlfile_type is "underway".

Thank you

Will the DB down if INACTIVE redo log group is deleted?

Platform: Oracle Linux 6.5

DB version: 11.2

If I delete one or all members of a Redo Log group online that is IDLE, manually (using the rm command) will be the DB crash?

Instead of everybody speculating, why not just run a test?

Oracle 11.2.0.1, Enterprise Edition, 64-bit on OL 5, running in archivelog mode

SQL> select group#,
  2 sequence#,
  3 archived,
  4 status
  5  from v$log
  6 order by group#
  7  ;
    GROUP# SEQUENCE# ARC STATUS
---------- ---------- --- ----------------
 1    1 YES INACTIVE
 2    2 YES INACTIVE
 3    3 NO  CURRENT
3 rows selected.
SQL> --
SQL> insert into scott.mytest values (sysdate);
1 row created.
SQL> commit;
Commit complete.
SQL> alter system switch logfile;
System altered.
SQL> select * from v$logfile;
    GROUP# STATUS  TYPE MEMBER  IS_
---------- ------- ------- ------------------------------ ---
 3 ONLINE /oradata/tulsa/redo03.rdo  NO
 2 ONLINE /oradata/tulsa/redo02.rdo  NO
 1 ONLINE /oradata/tulsa/redo01.rdo  NO
3 rows selected.
SQL>
SQL> select group#,
  2 sequence#,
  3 archived,
  4 status
  5  from v$log
  6 order by group#
  7  ;
    GROUP# SEQUENCE# ARC STATUS
---------- ---------- --- ----------------
 1    4 NO  CURRENT
 2    2 YES INACTIVE
 3    3 NO  ACTIVE
3 rows selected.

Group 2 is inactive, so delete the

SQL> !rm /oradata/tulsa/redo02.rdo
SQL> !ls -l /oradata/tulsa/redo02.rdo
ls: /oradata/tulsa/redo02.rdo: No such file or directory

And continue the activity of db. Keep an eye on the #2 group

SQL> select group#,
  2 sequence#,
  3 archived,
  4 status
  5  from v$log
  6 order by group#
  7  ;
    GROUP# SEQUENCE# ARC STATUS
---------- ---------- --- ----------------
 1    4 NO  CURRENT
 2    2 YES INACTIVE
 3    3 YES ACTIVE
3 rows selected.
SQL> insert into scott.mytest values (sysdate);
1 row created.
SQL> commit;
Commit complete.
SQL> alter system switch logfile;
System altered.
SQL> --
SQL> select group#,
  2 sequence#,
  3 archived,
  4 status
  5  from v$log
  6 order by group#
  7  ;
    GROUP# SEQUENCE# ARC STATUS
---------- ---------- --- ----------------
 1    4 NO  ACTIVE
 2    5 NO  CURRENT
 3    3 YES ACTIVE
3 rows selected.
SQL> insert into scott.mytest values (sysdate);
1 row created.
SQL> commit;
Commit complete.
SQL> alter system switch logfile;
System altered.
SQL> --
SQL> select group#,
  2 sequence#,
  3 archived,
  4 status
  5  from v$log
  6 order by group#
  7  ;
    GROUP# SEQUENCE# ARC STATUS
---------- ---------- --- ----------------
 1    4 YES INACTIVE
 2    5 NO  ACTIVE
 3    6 NO  CURRENT
3 rows selected.
SQL> insert into scott.mytest values (sysdate);
1 row created.
SQL> commit;
Commit complete.
SQL> alter system switch logfile;
System altered.
SQL> --
SQL> select group#,
  2 sequence#,
  3 archived,
  4 status
  5  from v$log
  6 order by group#
  7  ;
    GROUP# SEQUENCE# ARC STATUS
---------- ---------- --- ----------------
 1    7 NO  CURRENT
 2    5 NO  ACTIVE
 3    6 NO  ACTIVE
3 rows selected.
SQL> insert into scott.mytest values (sysdate);
1 row created.
SQL> commit;
Commit complete.
SQL> alter system switch logfile;

At this point, the SWTICH LOGFILE command has been attached, and in the alerts log, we see this:

CJQ0 started with pid=26, OS id=4817
Sat Sep 19 10:48:11 2015
Thread 1 advanced to log sequence 4 (LGWR switch)
  Current log# 1 seq# 4 mem# 0: /oradata/tulsa/redo01.rdo
Sat Sep 19 10:48:11 2015
Archived Log entry 1 added for thread 1 sequence 3 ID 0xdaf1e381 dest 1:
Sat Sep 19 10:48:44 2015
Thread 1 advanced to log sequence 5 (LGWR switch)
  Current log# 2 seq# 5 mem# 0: /oradata/tulsa/redo02.rdo
Sat Sep 19 10:48:44 2015
Archived Log entry 2 added for thread 1 sequence 4 ID 0xdaf1e381 dest 1:
Thread 1 cannot allocate new log, sequence 6
Checkpoint not complete
  Current log# 2 seq# 5 mem# 0: /oradata/tulsa/redo02.rdo
Thread 1 advanced to log sequence 6 (LGWR switch)
  Current log# 3 seq# 6 mem# 0: /oradata/tulsa/redo03.rdo
Sat Sep 19 10:48:48 2015
Errors in file /u01/app/oracle/diag/rdbms/tulsa/tulsa/trace/tulsa_arc3_4789.trc:
ORA-00313: open failed for members of log group 2 of thread 1
ORA-00312: online log 2 thread 1: '/oradata/tulsa/redo02.rdo'
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3
Errors in file /u01/app/oracle/diag/rdbms/tulsa/tulsa/trace/tulsa_arc3_4789.trc:
ORA-00313: open failed for members of log group 2 of thread 1
ORA-00312: online log 2 thread 1: '/oradata/tulsa/redo02.rdo'
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3
Thread 1 advanced to log sequence 7 (LGWR switch)
  Current log# 1 seq# 7 mem# 0: /oradata/tulsa/redo01.rdo
ARCH: Archival stopped, error occurred. Will continue retrying
ORACLE Instance tulsa - Archival Error
Thread 1 cannot allocate new log, sequence 8
Checkpoint not complete
  Current log# 1 seq# 7 mem# 0: /oradata/tulsa/redo01.rdo
ORA-16038: log 2 sequence# 5 cannot be archived
ORA-00312: online log 2 thread 1: '/oradata/tulsa/redo02.rdo'
Errors in file /u01/app/oracle/diag/rdbms/tulsa/tulsa/trace/tulsa_arc3_4789.trc:
ORA-16038: log 2 sequence# 5 cannot be archived
ORA-00312: online log 2 thread 1: '/oradata/tulsa/redo02.rdo'
Sat Sep 19 10:48:48 2015
Errors in file /u01/app/oracle/diag/rdbms/tulsa/tulsa/trace/tulsa_arc0_4777.trc:
ORA-00313: open failed for members of log group 2 of thread 1
ORA-00312: online log 2 thread 1: '/oradata/tulsa/redo02.rdo'
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3
Errors in file /u01/app/oracle/diag/rdbms/tulsa/tulsa/trace/tulsa_arc0_4777.trc:
ORA-00313: open failed for members of log group 2 of thread 1
ORA-00312: online log 2 thread 1: '/oradata/tulsa/redo02.rdo'
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3
Sat Sep 19 10:48:48 2015
Errors in file /u01/app/oracle/diag/rdbms/tulsa/tulsa/trace/tulsa_m000_4864.trc:
ORA-00313: open failed for members of log group 2 of thread 1
ORA-00312: online log 2 thread 1: '/oradata/tulsa/redo02.rdo'
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3
Checker run found 2 new persistent data failures
ORACLE Instance tulsa - Can not allocate log, archival required
Thread 1 cannot allocate new log, sequence 8
All online logs needed archiving
  Current log# 1 seq# 7 mem# 0: /oradata/tulsa/redo01.rdo
Sat Sep 19 10:48:59 2015
Errors in file /u01/app/oracle/diag/rdbms/tulsa/tulsa/trace/tulsa_arc2_4785.trc:
ORA-00313: open failed for members of log group 2 of thread 1
ORA-00312: online log 2 thread 1: '/oradata/tulsa/redo02.rdo'
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3
Errors in file /u01/app/oracle/diag/rdbms/tulsa/tulsa/trace/tulsa_arc2_4785.trc:
ORA-00313: open failed for members of log group 2 of thread 1
ORA-00312: online log 2 thread 1: '/oradata/tulsa/redo02.rdo'
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3
Sat Sep 19 10:48:59 2015
Errors in file /u01/app/oracle/diag/rdbms/tulsa/tulsa/trace/tulsa_arc1_4781.trc:
ORA-00313: open failed for members of log group 2 of thread 1
ORA-00312: online log 2 thread 1: '/oradata/tulsa/redo02.rdo'
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3
Errors in file /u01/app/oracle/diag/rdbms/tulsa/tulsa/trace/tulsa_arc1_4781.trc:
ORA-00313: open failed for members of log group 2 of thread 1
ORA-00312: online log 2 thread 1: '/oradata/tulsa/redo02.rdo'
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3
Sat Sep 19 10:49:59 2015
Errors in file /u01/app/oracle/diag/rdbms/tulsa/tulsa/trace/tulsa_arc2_4785.trc:
ORA-00313: open failed for members of log group 2 of thread 1
ORA-00312: online log 2 thread 1: '/oradata/tulsa/redo02.rdo'
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3
Errors in file /u01/app/oracle/diag/rdbms/tulsa/tulsa/trace/tulsa_arc2_4785.trc:
ORA-00313: open failed for members of log group 2 of thread 1
ORA-00312: online log 2 thread 1: '/oradata/tulsa/redo02.rdo'
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3
Sat Sep 19 10:49:59 2015
Errors in file /u01/app/oracle/diag/rdbms/tulsa/tulsa/trace/tulsa_arc3_4789.trc:
ORA-00313: open failed for members of log group 2 of thread 1
ORA-00312: online log 2 thread 1: '/oradata/tulsa/redo02.rdo'
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3
Errors in file /u01/app/oracle/diag/rdbms/tulsa/tulsa/trace/tulsa_arc3_4789.trc:
ORA-00313: open failed for members of log group 2 of thread 1
ORA-00312: online log 2 thread 1: '/oradata/tulsa/redo02.rdo'
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3
Sat Sep 19 10:49:59 2015
Errors in file /u01/app/oracle/diag/rdbms/tulsa/tulsa/trace/tulsa_m000_5163.trc:
ORA-00313: open failed for members of log group 2 of thread 1
ORA-00312: online log 2 thread 1: '/oradata/tulsa/redo02.rdo'
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3

One group of standby Redo Log is ACTIVE

Hi guys,.
I have successfully configured a custodian of data between a primary database (oradb) and a database ensures Physics (oradb_s8).
However, I have noticed that in V$ STANDBY_LOG only one group of standby Redo Log is ACTIVE, regardless of how many times I go log in the primary database.
' The following was stated in the documentation:
When a switch of newspaper occurs on the database of the source again, redo incoming is then written to the next group of waiting for redo log, and the group used newspaper before again Eve is archived by a foreground ARCn process.
Source.
So, I guess that group of standby Redo Log is turned on when the Redo Log is enabled in the primary database.
Could you please clarify it for me?
It's the Oracle 11 g R2 (11.2.0.1) on Red Hat Server 5.2.
On autonomy in standby:
SQL > SELECT GROUP #, THREAD #, SEQUENCE #, ARCHIVED, STATUS FROM V$ STANDBY_LOG
GROUP # THREAD # SEQUENCE # ARC STATUS
---------- ---------- ---------- --- ----------
4 1 248 YES ACTIVE <-this is the only group that is still ACTIVE
5 1 0 NOT ASSIGNED NO.
6 0 YES 0 UNASSIGNED
7 0 YES 0 UNASSIGNED
SQL > SELECT SEQUENCE #, APPLIED, FIRST_TIME NEXT_TIME
V $ ARCHIVED_LOG
SEQUENCE ORDER #;
SEQUENCE # FIRST_TIM NEXT_TIME APPLIED
---------- --------- --------- ---------
232 06-06-SEPT.-15-15-SEP YES
233 06-06-SEPT.-15-15-SEP YES
234 06-06-SEPT.-15-15-SEP YES
235 06-06-SEPT.-15-15-SEP YES
236 06-06-SEPT.-15-15-SEP YES
237 06-06-SEPT.-15-15-SEP YES
238 06-06-SEPT.-15-15-SEP YES
239 07-06-SEPT.-15-15-SEP YES
240 YES 15-SEP-07 07-SEVEN.-15
241 YES 15-SEP-07 07-SEVEN.-15
242 YES 15-SEP-07 07-SEVEN.-15
YES 243 15-SEP-07 07-SEVEN.-15
244 YES 15-SEP-07 07-SEVEN.-15
245 YES 15-SEP-07 07-SEVEN.-15
246 YES 15-SEP-08 15-SEP-07
247 15 - SEP - 08 IN-MEMORY 15-SEP-08
16 selected lines.
On the primary:
SQL > SELECT SEQUENCE #, APPLIED, FIRST_TIME NEXT_TIME
V $ ARCHIVED_LOG
WHERE NAME = 'ORADB_S8 '.
SEQUENCE ORDER #;
SEQUENCE # FIRST_TIM NEXT_TIME APPLIED
---------- --------- --------- ---------
232 06-06-SEPT.-15-15-SEP YES
233 06-06-SEPT.-15-15-SEP YES
234 06-06-SEPT.-15-15-SEP YES
235 06-06-SEPT.-15-15-SEP YES
236 06-06-SEPT.-15-15-SEP YES
237 06-06-SEPT.-15-15-SEP YES
238 06-06-SEPT.-15-15-SEP YES
239 07-06-SEPT.-15-15-SEP YES
240 YES 15-SEP-07 07-SEVEN.-15
241 YES 15-SEP-07 07-SEVEN.-15
YES 07-SEP-15 242 07-SEP-15
YES 243 15-SEP-07 07-SEVEN.-15
244 YES 15-SEP-07 07-SEVEN.-15
245 YES 15-SEP-07 07-SEVEN.-15
246 YES 15-SEP-08 15-SEP-07
247 NO. 15-SEP-08 08 - SEPT.-15

If you have a large DML activity on primary, you see more than one group # in v$ active standby_log.

RFS will always try to assign the next available standby log, because your group changes # 4 are already applied, it allocates this group again after the switch.

Check metalink doc: bug 2722195 and 219344.1

Bandwidth of the network for the redo log switches

Hi all
I'm using Oracle 11 g R2, I want to clarify the necessary bandwidth of my primary site to the secondary site (using Oracle Data guard)
My database is an Oracle RAC 2 nodes each node has a log size to 2 GB again. listen to this file in operation every 5 minutes. It means that I'm spending a 2 GB redo log file every 5 minutes from each node. This means that 4 GB in total every 5 minutes.
I'm planing to set up Oracle Dataguard in maximum performance mode. Is that mean I need a link between the primary and secondary site that is able to transfer files of 2 GB + 2 GB every 5 minutes?
I do the calculation below and need your advice:
4 GB / (5x60s) = 13981 KByte/s
This means that I need to link to 13981x8bites/s = 111, 848Kbit/s?
Is the above correct? your advice please
Kind regards

Please check below two

http://www.Oracle.com/au/products/database/MAA-WP-10gR2-dataguardnetworkbestpr-134557.PDF

How to calculate bandwidth transfer network required recovery in care of data (Doc ID 736755.1)

difference between redo log .rdo .log extension

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