One group of standby Redo Log is ACTIVE

Similar Questions

• Standby redo logs must be configured on the primary

  Oracle 11.2.0.4, 4 CARS on primary node

  Oracle 11.2.0.4, node 4 CARS waiting

  Configured with oracle Data Guard using Data Guard Broker

  I use the latest version or orachk 12.1.0.2.4

  In the orachk report, I see the following error message:

  Standby redo logs must be configured on the primary

  +RECO/finprd1/onlinelog/group_13.2146.881183157

  +RECO/finprd1/onlinelog/group_14.2143.881183159

  +RECO/finprd1/onlinelog/group_15.5008.881183161

  +Data/finprd1/onlinelog/group_16.1660.881183161

  +RECO/finprd1/onlinelog/group_16.5003.881183161

  +RECO/finprd1/onlinelog/group_17.4999.881183163

  +RECO/finprd1/onlinelog/group_18.2096.881183163

  +RECO/finprd1/onlinelog/group_19.2094.881183305

  +RECO/finprd1/onlinelog/group_20.1778.881183305

  +RECO/finprd1/onlinelog/group_21.4994.881183307

  +RECO/finprd1/onlinelog/group_22.4992.881183307

  +RECO/finprd1/onlinelog/group_23.2049.881183307

  +RECO/finprd1/onlinelog/group_24.1454.881183309

  +RECO/finprd1/onlinelog/group_25.4983.881183309

  +RECO/finprd1/onlinelog/group_26.1688.881183309

  +RECO/finprd1/onlinelog/group_27.4973.881183311

  +RECO/finprd1/onlinelog/group_28.4969.881183311

  But when I check the primary database, I see that there are waiting for redo logs. So, why the error? Any ideas?

  [SYS@FINPRD11] SQL > select

  2 lg.group #.

  LG.type,

  3 4 lg.member

  l.bytes/1024/1024 as SIZE_MB

  Of

  5 6 7 v$ logfile lg,.

  v 8 $log l

  9 where

  10 lg.group #= l.group #.

  Union of all the

  11 12 select

  LG.Group # 13,

  LG.type 14,

  15 lg.member,

  16 st.bytes/1024/1024 as SIZE_MB

  17 of

  18 v$ logfile lg,.

  19 v$ standby_log st

  where the 20

  21 lg.group #= st.group #;

  GROUP # TYPE MEMBER SIZE_MB

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

  1 +DATA/finprd1/onlinelog/group_1.286.876507139 on LINE 512

  1 +RECO/finprd1/onlinelog/group_1.706.876507139 on LINE 512

  +DATA/finprd1/onlinelog/group_2.384.876507141 online 2 512

  +RECO/finprd1/onlinelog/group_2.737.876507141 online 2 512

  +DATA/finprd1/onlinelog/group_7.451.876507495 online 7 512

  +RECO/finprd1/onlinelog/group_7.714.876507497 online 7 512

  +DATA/finprd1/onlinelog/group_8.450.876507497 online 8 512

  +RECO/finprd1/onlinelog/group_8.1162.876507497 online 8 512

  +DATA/finprd1/onlinelog/group_5.449.876507499 online 5 512

  +RECO/finprd1/onlinelog/group_5.355.876507499 online 5 512

  +DATA/finprd1/onlinelog/group_6.448.876507499 online 6 512

  +RECO/finprd1/onlinelog/group_6.818.876507501 online 6 512

  +DATA/finprd1/onlinelog/group_3.447.876507501 online 3 512

  +RECO/finprd1/onlinelog/group_3.1188.876507501 online 3 512

  4 +DATA/finprd1/onlinelog/group_4.446.876507503 on LINE 512

  4 +RECO/finprd1/onlinelog/group_4.385.876507503 on LINE 512

  +DATA/finprd1/onlinelog/group_9.1653.881182905 online 9 512

  +RECO/finprd1/onlinelog/group_9.5058.881182905 online 9 512

  +DATA/finprd1/onlinelog/group_10.1654.881182985 online 10 512

  +RECO/finprd1/onlinelog/group_10.2206.881182985 online 10 512

  +DATA/finprd1/onlinelog/group_11.1655.881182985 online 11 512

  +RECO/finprd1/onlinelog/group_11.2205.881182987 online 11 512

  +DATA/finprd1/onlinelog/group_12.1656.881182987 online 12 512

  +RECO/finprd1/onlinelog/group_12.5045.881182987 online 12 512

  +RECO/finprd1/onlinelog/group_13.2146.881183157 EVE 13 512

  +RECO/finprd1/onlinelog/group_14.2143.881183159 EVE 14 512

  +RECO/finprd1/onlinelog/group_15.5008.881183161 EVE 15 512

  +DATA/finprd1/onlinelog/group_16.1660.881183161 EVE 16 512

  +RECO/finprd1/onlinelog/group_16.5003.881183161 EVE 16 512

  +RECO/finprd1/onlinelog/group_17.4999.881183163 EVE 17 512

  +RECO/finprd1/onlinelog/group_18.2096.881183163 EVE 18 512

  +RECO/finprd1/onlinelog/group_19.2094.881183305 standby 19 512

  +RECO/finprd1/onlinelog/group_20.1778.881183305 EVE 20 512

  +RECO/finprd1/onlinelog/group_21.4994.881183307 EVE 21 512

  22 +RECO/finprd1/onlinelog/group_22.4992.881183307 ENSURES 512

  +RECO/finprd1/onlinelog/group_23.2049.881183307 EVE 23 512

  +RECO/finprd1/onlinelog/group_24.1454.881183309 EVE 24 512

  +RECO/finprd1/onlinelog/group_25.4983.881183309 EVE 25 512

  26 +RECO/finprd1/onlinelog/group_26.1688.881183309 ENSURES 512

  +RECO/finprd1/onlinelog/group_27.4973.881183311 EVE 27 512

  +RECO/finprd1/onlinelog/group_28.4969.881183311 EVE 28 512

  41 selected lines.

  [SYS@FINPRD11] SQL > SELECT GROUP #, THREAD #, SEQUENCE #, ARCHIVED, STATUS FROM V$ STANDBY_LOG

  2;

  GROUP # THREAD # SEQUENCE # ARC STATUS

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

  13 1 0 UNASSIGNED YES

  14 1 0 UNASSIGNED YES

  15 1 0 UNASSIGNED YES

  16 1 0 UNASSIGNED YES

  17 2 0 UNASSIGNED YES

  18 2 0 UNASSIGNED YES

  19 2 0 UNASSIGNED YES

  20 2 UNASSIGNED YES 0

  21 3 0 UNASSIGNED YES

  22 3 0 UNASSIGNED YES

  23 3 0 UNASSIGNED YES

  GROUP # THREAD # SEQUENCE # ARC STATUS

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

  24 3 0 UNASSIGNED YES

  25 4 0 UNASSIGNED YES

  26 4 0 UNASSIGNED YES

  27 4 0 UNASSIGNED YES

  28 4 0 UNASSIGNED YES

  IT would be difficult to debug, better you trigger SR in support to verify the code. Good thing is you know again sleep exists, so why worry.

  You can ignore it.

• Standby redo logs

  Hi all

  For the installation of dataguard, supposed to docs create standby redo logs on the standby server.

  It does not mention to create logs to redo waiting on the primary server.

  So what happens if I pass of the day before?

  Then my primary db now becomes the day before db. But there is no waiting for redo logs?

  Kindly shed lights...

  Thank you very much

  JC

  Jenna_C wrote:

  Hi Sysas and ALL,

  the rule is to create a group of newspapers waiting to roll forward pending Eve more than the number of redo log group in the primary.

  Do you mean > the rule is to create a group of newspapers waiting to roll forward pending Eve more than the number of the Group of online redo logs in the primary?

  So, if I have 3 ONLINE redo log groups and 4 STANDBY redo log at the primary level, 3o + 4 s = 7

  I'll create 3 groups of online redo logs and 1 redo log group ENSURES the standby?     3O + 1 s = 4

  Why not just create everything as even with the main number?  3O + 4 s = 7 for sleep?

  Thank you.

  Sorry... If you have 3 groups of newspapers online redo (in primary and standby), and then create 4 STANDBY redo record groups (primary and standby).

  Concerning

• Creating standby Redo Log

  DB version: 11.2
  OPERATING SYSTEM: AIX 6.1
  
  We have a 2 RAC node. We have a disk group for all files of data, tempfiles, recovery logs... etc.
  Currently in our primary database Redo logs look like
  

  SQL> SELECT a.group#, b.thread#, a.member, b.bytes
  FROM v$logfile a, v$log b WHERE a.group# = b.group#
  order by a.group# , b.thread#  2    3  ;
  
           GROUP#         THREAD# MEMBER                                BYTES
  --------------- --------------- -------------------------------- ---------------
                1               1 +ORCL_DG/orcl/orcl_log01.dbf         104857600
                2               1 +ORCL_DG/orcl/orcl_log02.dbf         104857600
                3               1 +ORCL_DG/orcl/orcl_log03.dbf         104857600
                4               2 +ORCL_DG/orcl/orcl_log04.dbf         104857600
                5               2 +ORCL_DG/orcl/orcl_log05.dbf         104857600
                6               2 +ORCL_DG/orcl/orcl_log06.dbf         104857600
  
  6 rows selected.
  
  1 member per group
  3 group per instance

  We need to create a physical standby DB for DB above with real time applies. For standby Redo logs, I need a log file additional for each Instance.
  
  So, I'll add
  Group # 7 for thread 1
  and
  Group # 8 for thread 2
  
  Finally, SRls will look like
  
  

           GROUP#         THREAD# MEMBER                                BYTES
  --------------- --------------- -------------------------------- ---------------
                1               1 +ORCL_DG/orcl/orcl_log01.dbf         104857600
                2               1 +ORCL_DG/orcl/orcl_log02.dbf         104857600
                3               1 +ORCL_DG/orcl/orcl_log03.dbf         104857600
                
             7               1 +ORCL_DG/orcl/orcl_log07.dbf         104857600  ------->  Additional
  
                4               2 +ORCL_DG/orcl/orcl_log04.dbf         104857600
                5               2 +ORCL_DG/orcl/orcl_log05.dbf         104857600
                6               2 +ORCL_DG/orcl/orcl_log06.dbf         104857600
                
             8               2 +ORCL_DG/orcl/orcl_log08.dbf         104857600  ------->  Additional

  Something wrong with my creation SRL project?

  Super good

  1 member by regular group raises a different issue.

  Generating all you need is 1.

  Best regards

  mseberg

• Standby Redo logs and the Directory Structure in the Backup Site

  Hi guru

  I just want to confirm, I know that if the directory structure is different, I need to talk about these 2 settings in the file pfile

  on the main site:

  DB_CONVERT_DATAFILE = 'sleep', 'primary '.

  LOG_CONVERT_DATAFILE = 'sleep', 'primary '.

  On the secondary Site:

  DB_CONVERT_DATAFILE = 'primary', 'sleep '.

  LOG_CONVERT_DATAFILE = 'primary', 'sleep '.

  But I want to confirm this weather I have to deliver the full path of the directory in the two paramtere above:

  as:

  DB_CONVERT_DATAFILE = ' / u01/oracle/app/oracle/oradata/sleep ', ' / u01/oracle/app/oracle/oradata/primary.

  LOG_CONVERT_DATAFILE = ' / u01/oracle/app/oracle/oradata/sleep ', ' / u01/oracle/app/oracle/oradata/primary.

  Second Confusion: -.

  After that transfer standby Redo logs creates primary and made to sleep on the foregoing, mentioned the directory structure and after restoring the alongwith primary db backup, that ensures the control file will not affect the journal of physics again placed watch on the above mentioned location.

  Thanks in advance for your help

  vk82 wrote:

  In fact, I create the day before by using the RMAN Duplicate command. but where I am confused is the point if I transfer the backup that i taken the pri on the C:\backup_files path. and after that, I transfer the backups to the waiting on C:\backup_files. After that when I restore it will create datafile and other stuff in another directory I mentioned using DB_FILE_NAME_CONVERT as LOG_FILE_NAME_CONVERT. I think Yes but need your advice during the same period.

  Hello

  Yes, files should be created under the directory mentioned in the path of the parameters 'db_file_name_convert' and 'log_file_name_convert.

  Kind regards
  Shivananda

• All groups of redo log is active

  Hello dear gurus!
  
  After the closing of the database with the option "Cancel".
  We have unconsisten State of data files.
  I ask to explain:
  (1) - ARCH background processes flashes all redo buffer in redolog?
  (In other words how achieved consistency if all redo log groups was in Active state before you stop?)
  
  (2) where the content buffer in this case are being dumped?
  
  Thank you and best regards,
  Pavel
  
  Published by: Pavel on July 19, 2012 21:49

  Pavel wrote:
  After the closing of the database with the option "Cancel".
  We have unconsisten State of data files.
  I ask to explain:
  (1) - ARCH background processes flashes all redo buffer in redolog?
  (In other words how achieved consistency if all redo log groups was in Active state before you stop?)

  He is the author of newspaper (lgwr) that copies the buffer log in log files - but if you make a judgment that the last piece of information in the log buffer is not copied, he lost.
  Note: one of your log files will be CURRENT, that's the one that the editor of newspaper is written, ASSETS are simply online redo logs that are still necessary for recovery and therefore can not be overwritten.

  (2) where the content buffer in this case are being dumped?

  See (1) - they are not.

  Concerning
  Jonathan Lewis

• the stubborn standby redo log

  I have a dowstreams that has four groups of log roll forward pending. one of these groups is always in a redo of the day 23/04/2010. This former roll forward is not filed, always there.
  This implies that the endorsements of the database are working with three groups of redo log and some oacaciones all that is in the active State and at this time that the view v $ archived_dest returns the error for that destination (natural).
  
  the question is:
  
  How can I eliminate this newspaper waiting for redo which is more archived.
  
  Thank you very much for your attention

  You have error messages in the alert log?

  See this Metalink Note:
  Alert.log watch no. standby redo Logfiles of size 153600 available blocks [405836.1 ID]

• Standby redo log query

  Hello team,

  I have a query:

  When I add or delete redo Eve journal/primary group is that ensure redo log group corresponding is added / removed pending?

  Kind regards

  As already answer, this change will be automatically in standby mode.

  This section of the documentation discusses steps to add redo log files to a database of pending. I find that to be a little lack of detail, so you can also visit Metalink Note 740675.1 online Redo Logs in physical availability.

  HTH,

  Brian

• I have to create the new group for waiting for redo log files?

  I have 10 group of files redo log with 2 members of each group for my primary database, I need to create new group for redo log files for the database of relief pending

  Group # members

  ==============

  1              2

  2              2

  3             2

  4             2

  5             2

  6             2

  7             2

  8             2

  9             2

  2 of 10

  If so, the following statement is correct? or nto

  ALTER DATABASE ADD STANDBY LOGFILE GROUP 1 ('D:\Databases\epprod\StandbyRedoLog\REDO01.) LOG',D:\Databases\epprod\StandbyRedoLog\REDO01_1.log');

  Please correct me if am doin wrong

  because when I run the statement I have error message saying: the group is already created.

  Thanks John

  I just found the answer

  Yes, it of recomeded to add the new group, for instnace if I have 10 group of 1 to 10, then the wait should be from 11 to 20

  Thanks I found the answer.

• How do I know if there's bottleneck in the redo logs?

  Hi all

  EBS R12.2

  11 GR 2

  OL 6.5

  We have two groups of log of size 1 GB.

  and oyour archiving logs generates 13 newspapers every hour.

  -rw - r-. 1 oraprod s/n 956896768 Jan 25 14:00 1_3372_898613761.dbf

  -rw - r-. 1 oraprod s/n 1004083200 Jan 25 14:03 1_3373_898613761.dbf

  -rw - r-. 1 oraprod s/n 928530432 Jan 25 14:10 1_3374_898613761.dbf

  -rw - r-. 1 oraprod s/n 928728576 Jan 25 14:12 1_3375_898613761.dbf

  -rw - r-. 1 oraprod s/n 967805952 Jan 25 14:20 1_3376_898613761.dbf

  -rw - r-. 1 oraprod s/n 916065792 Jan 25 14:22 1_3377_898613761.dbf

  -rw - r-. 1 oraprod s/n 951790592 Jan 25 14:30 1_3378_898613761.dbf

  -rw - r-. 1 oraprod s/n 978358272 Jan 25 14:32 1_3379_898613761.dbf

  -rw - r-. 1 oraprod s/n 974519808 Jan 25 14:40 1_3380_898613761.dbf

  -rw - r-. 1 oraprod s/n 960421376 Jan 25 14:42 1_3381_898613761.dbf

  -rw - r-. 1 oraprod s/n 917438976 Jan 25 14:49 1_3382_898613761.dbf

  -rw - r-. 1 oraprod s/n 920794624 Jan 25 14:51 1_3383_898613761.dbf

  -rw - r-. 1 oraprod s/n 920704000 Jan 25 14:59 1_3384_898613761.dbf

  I got this alert saves messages:

  Mon Jan 25 15:08:37 2016

  Filled checkpoint up to RBA [0xd3b.2.10], RCS: 5978324588151

  Mon Jan 25 15:10:57 2016

  Thread 1 cannot allot of new newspapers, sequence 3388

  Private stream flush is not complete

  Currently journal # 1, seq # 3387 mem # 0: /home/oraprod/PROD/data/log01a.dbf

  Currently journal # 1, seq # 3387 mem # 1: /home/oraprod/PROD/data/log01b.dbf

  Beginning log switch checkpoint up to RBA [0xd3c.2.10], RCS: 5978324634623

  Thread 1 Advanced for you connect to sequence 3388 (switch LGWR)

  Currently Journal # 2 seq # 3388 mem # 0: /home/oraprod/PROD/data/log02a.dbf

  Currently Journal # 2 seq # 3388 mem # 1: /home/oraprod/PROD/data/log02b.dbf

  Mon Jan 25 15:11:01 2016

  LNS: Standby redo log file selected for thread 1 sequence 3388 for destination LOG_ARCHIVE_DEST_2

  Mon Jan 25 15:11:04 2016

  Archived journal 6791 extra for each sequence 1 3387 ID thread entry 0 x 12809081 dest 1:

  Mon Jan 25 15:11:17 2016

  Filled checkpoint up to RBA [0xd3c.2.10], RCS: 5978324634623

  Mon Jan 25 15:13 2016

  Additional checkpoint up to RBA to RBA [0xd3c.1a8e82.0] [0xd3c.18d210.0], current journal line

  Mon Jan 25 15:13:04 2016

  Thread 1 cannot allot of new newspapers, sequence 3389

  Private stream flush is not complete

  Currently Journal # 2 seq # 3388 mem # 0: /home/oraprod/PROD/data/log02a.dbf

  Currently Journal # 2 seq # 3388 mem # 1: /home/oraprod/PROD/data/log02b.dbf

  Beginning log switch checkpoint up to RBA [0xd3d.2.10], RCS: 5978324673444

  Thread 1 Advanced for you connect to 3389 (switch LGWR) sequence

  Currently journal # 1, seq # 3389 mem # 0: /home/oraprod/PROD/data/log01a.dbf

  Currently journal # 1, seq # 3389 mem # 1: /home/oraprod/PROD/data/log01b.dbf

  Mon Jan 25 15:13:07 2016

  LNS: Standby redo log file selected for thread 1 sequence 3389 for destination LOG_ARCHIVE_DEST_2

  Mon Jan 25 15:13:09 2016

  Archived journal 6793 extra for each sequence 1 3388 ID thread entry 0 x 12809081 dest 1:

  Mon Jan 25 15:13:11 2016

  Filled checkpoint up to RBA [0xd3d.2.10], RCS: 5978324673444

  Is it a sign of botteneck? Users complained that each 15:00 they encounter performance degradation.

  Kind regards

  JC

  Jenna_C wrote:

  We have two groups of size 1 GB log and our archiving logs generates 13 newspapers every hour.

  Is it a sign of botteneck? Users complained that each 15:00 they encounter performance degradation.

  If your users are complaining about slow at 15:00 then look at what is happening on the system at this point in time.  Use the Active Session history, providing that you have the license, at 3 pm to see if there is a problem.  Or take snapshots of the AWR manually around 15:00 in an attempt to capture any anomaly.  Or capture instant V$ SESSION yourself manually around 15:00 and see so many sessions is pending or not.

  I have seen problems like this on shared physical infrastructure systems where the activity on a system can interfere with each other.  Attention to this kind of thing, because if it is caused by another system then you will never find the cause of the problem inside the Oracle.  Examples include backups are made at a specific time, causing large amounts of sequential disk i/o and slows down access to the drive for everything else.  Such a scenario could cause some writing redo log time to increase significantly.  Or the backup could be another system completely who shares the same disks in the same drive bay or the SAN and Bay drives or SAN is inundated by applications e/s backup.  But as it's another system, that you will not see what is happening on your Oracle database system.

  Or a virtualized with environment sharing CPU and memory where another virtual machine running a CPU intensive job and steals the Oracle system CPU capacity.  I saw the same thing with memory so - Vmware has a strange way to virtualize memory, which means it can use all of the memory on the physical hardware and run out, and then he had to intervene to release somehow little memory.  What ends up slowing things down.

  It could be a network problem - is something that the network of the floods at 15:00?  Still, backups can be a common cause of this, during the transfer of data over the network to another system.  Is there a work extracted regularly data which runs at 15:00 for example extract given OLTP to feed into a data warehouse, which is copied on the network?

  It could be many different things, causing the slowdown.  I would definitely recommend watching any expected sessions know and see if this gets worse around 15:00, or if it remains the same, in which case the problem is elsewhere.  You must also eliminate everything else - the disks, network, etc.

  Good luck

  John Brady

• 11.2.0.3 Pri RAC ASM with failover standby Post normal FileSys Active

  The architecture consists of two node rac asm primary and a normal file system active standby on Oracle 11 g 2 11.2.0.3. With the Basic Configuration of broker.
  
  Made a move to the managed broker and not the file system Normal has the main role and the eve consists of two node rac asm. I want to switchback, i.e., former principal-> former role primary and Standby-> role of Eve.
  
  However, my broker contains the following:
  DGMGRL > show configuration detailed;
  
  Configuration - DG_PRI_CFG
  
  Protection mode: MaxPerformance
  Databases:
  EVE - primary database
  WARNING: ORA-16829: accelerated failover configuration is trolling
  
  KEMETRAC - (*) Physical standby database
  Error: ORA-16810: multiple errors or warnings found for the database
  
  (*) Fast failover target
  
  Properties:
  FastStartFailoverThreshold = "95"
  OperationTimeout = "30"
  FastStartFailoverLagLimit = "95"
  CommunicationTimeout = "180"
  FastStartFailoverAutoReinstate = 'TRUE '.
  FastStartFailoverPmyShutdown = 'TRUE '.
  BystandersFollowRoleChange = "ALL".
  
  Fast-Start Failover: ENABLED
  
  Threshold: 95 seconds
  Target: KEMETRAC
  Observer: emcc.respecti.com
  Offset limit: 95 seconds
  Primary closure: TRUE
  Auto-Rétablir: TRUE
  
  The configuration status:
  ERROR
  
  
  
  I found a recommendation to increase the value of FastStartFailoverThreshold = '90';
  Although I still meet the above configuration error.
  
  Recommendations are appreciated!
  
  Published by: 783527 on March 12, 2012 19:41

  Hello

  According to the guidelines of your output, you can see log files waiting for new primary forward, but you haven't posted from sleep mode if you have set up the standby redo log files or not?
  This problem occurs only if there is an incorrect configuration , reconfigure then again by abandonment & recreating.

  Sleep mode: -.

  SQL > select group #, sequence #, bytes/1024/1024, used condition, stored in v$ standby_log;
  SQL > select group #, thread #, sequence #, bytes/1024/1024, archived, the journal of v status $;

  Check out these links
  http://docs.Oracle.com/CD/E11882_01/server.112/e17022/log_transport.htm#BABCBEGJ
  http://www.Pythian.com/news/581/Oracle-standby-redo-logs/

• Question about how Oracle manages the Redo logs

  Hello
  
  Assuming a configuration which consists of 2 redo log groups (groups A and B), each group of 2 disks (disks A1 and A2 for Group A) and B1 and B2 disks for Group B. Additionally, assume that each redo log file resides by itself in a disk storage device and that the device is dedicated to her. So in the situation described above, there are 4 discs, one for each redo log file, and each disc contains nothing other than a redo log file. Also, assume that the database is in ARCHIVELOG mode and the files from archive is stored on another different set of devices.
  
  kind of graphically:
  

      GROUP A             GROUP B
  
        A1                  B1
        A2                  B2

  The question is: when the disks that make up the Group A are filled and Oracle switches to the disks in the Group B, can the group drives to take offline, perhaps even physically removed from the system if necessary without affecting the functioning of the database? Can the archiver process temporarily delayed until the disks (which have been removed) are presented online or is the DBA have to wait until the end of the process to archive a copy of the redo log file creating in archive?
  
  Thank you for your help,
  
  John.

  Hello
  A journal of the groups fall

  To remove a group of online redo logs, you must have the ALTER DATABASE system privilege. Before you delete a line redo log group, consider the following precautions and restrictions:

  * An instance requires at least two groups of files logging online, regardless of the number of members in the groups. (A group is one or more members.)
  * You can delete a group of newspapers online redo only if it is inactive. If you need to drop the current group, first force a log switch occurs.
  * Make sure a group of online redo logs is archived (if archiving is enabled) before dropping. To see if this happens, use the view LOG V$.

  SELECT GROUP #, ARCHIVED, STATUS FROM V$ LOG;

  GROUP # ARC STATUS
  --------- --- ----------------
  1 ACTIVE YES
  2. NO CURRENT
  3 INACTIVE YES
  4 INACTIVE YES

  Delete a group of newspapers online redo with the SQL ALTER DATABASE statement with the DROP LOGFILE clause.

  The following statement drops redo log group number 3:

  ALTER DATABASE, DROP LOGFILE GROUP 3;

  When a group of online redo logs is deleted from the database, and you do not use Oracle managed files, operating system files are not removed from the disk. Instead, control of the associated database files are updated to remove members of the Group of the database structure. After deleting a group of online redo logs, make sure the drop completed successfully and then use the command of operating system appropriate to delete the dropped online redo log files.

  When you work with files managed by Oracle, the cleaning of operating system files is done automatically for you.
  Your database will not be affected as you can work with 2 files, redo log in each group, as the minimum number of redo log in a database file is two because the process LGWR (newspaper writer) writes in the redo log in a circular way. If the process crashes because you have 2 groups only if you want to remove 1 Add a third and make that the current group and remove the one you want to be offline.

  Please refer to:
  http://download.Oracle.com/docs/CD/B10500_01/server.920/a96521/onlineredo.htm#7438
  Kind regards
  Mohamed
  Oracle DBA

• How to create Redo Log as a good way to avoid the problem of performance

  Hi Experts,

  I work in the following environment.

  OS - Windows server 2012

  version - 11.2.0.1.0

  Server: production server

  1 to 10 of each month, we have huge process. Like many DML and ddl involve.

  I've implemented the RMAN also.

  My Alerts log entry is as below,

  Kills Sep 08 17:05:34 2015

  Thread 1 cannot allot of new newspapers, 88278 sequence

  Private stream flush is not complete

  Currently journal # 1, seq # 88277 mem # 0: D:\APP\ADMINISTRATOR\ORADATA\AWSPROCESS\REDO01. JOURNAL

  Thread 1 Advanced to record the sequence 88278 (switch LGWR)

  Currently Journal # 2 seq # 88278 mem # 0: D:\APP\ADMINISTRATOR\ORADATA\AWSPROCESS\REDO02. JOURNAL

  Kills Sep 08 17:05:38 2015

  Archived journal 81073 extra for each sequence 1 88277 0x38b3fdf6 dest ID thread entry 1:

  Kills Sep 08 17:05:52 2015

  Thread 1 cannot allot of new newspapers, sequence 88279

  Checkpoint is not complete

  Currently Journal # 2 seq # 88278 mem # 0: D:\APP\ADMINISTRATOR\ORADATA\AWSPROCESS\REDO02. JOURNAL

  Thread 1 Advanced to record the sequence 88279 (switch LGWR)

  Currently Journal # 3 seq # 88279 mem # 0: D:\APP\ADMINISTRATOR\ORADATA\AWSPROCESS\REDO03. JOURNAL

  Kills Sep 08 17:05:58 2015

  Archived journal 81074 extra for each sequence 1 88278 0x38b3fdf6 dest ID thread entry 1:

  Kills Sep 08 17:06:16 2015

  Thread 1 cannot allot of new newspapers, sequence 88280

  Checkpoint is not complete

  When I check in the internet I found a few points and need clarity also by the following.

  -It is recommended that this switch Redo log 5 times maximum per hour, but I have this time of maximum peak about 100 redo log changes occur.

  -It is recommended to have the large size of the Redo log. But I have 3 Group of redo and each size is 50 MB by default.

  -My group of Redo log not multiplexed and it by default with each group have only a single Member

  Group 1 - D:\APP\ADMINISTRATOR\ORADATA\AWSPROCESS\REDO01. JOURNAL

  Group 2 - D:\APP\ADMINISTRATOR\ORADATA\AWSPROCESS\REDO02. JOURNAL

  Group 3 - D:\APP\ADMINISTRATOR\ORADATA\AWSPROCESS\REDO03. JOURNAL

  And advised by experts with add that again group will give more performance in the other location. Is it mean that I need to add the Redo log as a different group, player or Redo Log itself I need to replace the other location.

  Say in the end, My Live server works with the location and size of restore default. I'm trying to create a better way and get all confused

  How to do it perfectly.

  Experts, please share your comments to my environment to log redo instance as better through your comment or recommended weblink based on my above needs, or a document.

  Thanks in advance, if you need more information to help me, then ask me, I'll share you.

  Hello

  You can't resize an existing redo log group.

  You will need to create 3 new redo log groups and drop old log redo (with 200 MB size) groups.

  Here you can find a good explanation: DBA for Oracle tips Archives

• bottleneck during the passage of the redo log files.

  Hi all
  
  I'm using Oracle 11.2.0.3.
  
  The enforcement team has indicated that they are facing slow at some point.
  
  I followed the database and I found that at some passage of redo log files (not always), I am facing a slow at the application level.
  
  I have 2 son since my database is CARS, each thread has 3 groups of multiplexed redo logs the FIU, with size of 300 MB each.
  
  Is it possible to optimize the switch of the redo log files? knowing that my database is running in ARCHIVELOG mode.
  
  Kind regards

  Hello

  Yes, Oracle recommends 1 validation by 30 calls from users or less. Of course, every database is different, so this rule cannot be taken too literally, but in your case, this rule seems to apply. In any case State, 900 undertakes seconds it looks like a very large number and the need for a high number of transactions should be questioned. You should talk to your analysts/application management/enterprise architect if warranted - that is to say if the application does in fact almost 2 000 business transactions per second.

  What about DB CPU: here is a link to a blog that I wrote on this subject, it should help to better understand this number:

  http://Savvinov.com/2012/04/06/AWR-reports-interpreting-CPU-usage/

  But briefly: DB processor isn't a real event, it is simply an indication that the sessions are on CPU (or waiting for CPU) rather than wait on i/o requests or events in the database. It is not necessarily a bad thing, because the database must perform tasks and he cannot do without loading the CPU. It may indicate a problem in two cases: when the CPU usage is close to the limit of the host (OS stats section indicates that you are very far from there) or when the CPU is a % of DB time - in the latter case, this could mean that you are making too many logical reads due to inefficient plans or analysis too. In any case, this does not apply to you, because 20 percent is not very high a number.

  Other items in the list of the top 5 deserve attention, too - gc buffer busy acquire, gc current block busy, enq: TX - line lock conflict.

  To summarize, your database under a lot of stress - whether it is the legitimate workload, and if this is the case, you may need to upgrade your hardware later. There is chance that it isn't - for example a high number of runs may indicate that rather than to bulk operations database code using PL/SQL loops, which is a big performance killer. Check "Top SQL by executions" about whether or not this is the case.

  Good luck!

  Best regards
  Nikolai

• 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