Impossible to move a group of Redo Log
HelloMy database is running on version 11.1.0.7 on platform OEL.
I am trying to remove one of the Redo Log group Active, it fails with the error below. Could someone please help me solve this problem?
SQL > select * from v$log;
GROUP# THREAD# SEQUENCE# BYTES MEMBERS ARCHIVED STATUS FIRST_CHANGE# FIRST_TIME
---------- ---------- ---------- ---------- ---------- --------- ------------------------------------------------ ------------- --------------------------
10 1 8017 524288000 2 YES INACTIVE 1.2120E+13 17-JUN-2012 19:43:49
11 1 8018 524288000 2 YES INACTIVE 1.2120E+13 18-JUN-2012 06:49:45
12 1 8019 524288000 2 YES INACTIVE 1.2120E+13 18-JUN-2012 16:56:43
13 1 8021 524288000 2 YES INACTIVE 1.2120E+13 18-JUN-2012 23:18:07
14 1 8020 524288000 2 YES INACTIVE 1.2120E+13 18-JUN-2012 23:14:27
15 1 8022 524288000 2 NO CURRENT 1.2120E+13 19-JUN-2012 01:07:27
16 2 6835 524288000 2 YES INACTIVE 1.2120E+13 18-JUN-2012 23:15:46
17 2 6836 524288000 2 YES INACTIVE 1.2120E+13 18-JUN-2012 23:18:04
18 2 6837 524288000 2 YES INACTIVE 1.2120E+13 18-JUN-2012 23:20:22
19 2 6838 524288000 2 YES INACTIVE 1.2120E+13 18-JUN-2012 23:22:38
20 2 6839 524288000 2 NO CURRENT 1.2120E+13 19-JUN-2012 01:07:24
21 2 6832 524288000 2 YES INACTIVE 1.2120E+13 18-JUN-2012 23:11:45
22 3 3771 524288000 2 YES INACTIVE 1.2103E+13 09-SEP-2011 22:04:11
23 3 3772 524288000 2 YES INACTIVE 1.2103E+13 09-SEP-2011 23:55:55
24 3 3773 524288000 2 YES ACTIVE 1.2103E+13 09-SEP-2011 23:55:59
25 3 3766 524288000 2 YES INACTIVE 1.2103E+13 08-SEP-2011 22:05:29
26 3 3767 524288000 2 YES INACTIVE 1.2103E+13 08-SEP-2011 22:05:50
27 3 3768 524288000 2 YES INACTIVE 1.2103E+13 09-SEP-2011 14:02:05
SQL > archive log list;
Database log mode Archive Mode
Automatic archival Enabled
Archive destination /archive/MYCSMA/MYCSMA2
Oldest online log sequence 6832
Next log sequence to archive 6839
Current log sequence 6839
SQL > archive log all;
ORA-00271: there are no logs that need archiving
SQL > ALTER SYSTEM ARCHIVE LOG GROUP 24;
ALTER SYSTEM ARCHIVE LOG GROUP 24
*
ERROR at line 1:
ORA-16013: log 24 sequence# 3773 does not need archiving
SQL > alter database drop LOGFILE group 24;
alter database drop LOGFILE group 24
*
ERROR at line 1:
ORA-01623: log 24 is current log for instance MYCSMA3 (thread 3) - cannot drop
ORA-00312: online log 24 thread 3: '/u247/oradata/MYCSMA/redo24_1.log'
ORA-00312: online log 24 thread 3: '/u247/oradata/MYCSMA/redo24_2.log'
It was previously a node 3 CARS, and when he was moved to another machine, he got to build with a 2 RAC nodes.So, 3 wire is no more necessary. This is why I intend to drop these of Redo Log groups.
Thank you!
Try
ALTER DATABASE DISABLE THREAD 3.
Tags: Database
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I'm testing a disk failure scenario. I had recovery multiplexes on three sites (Windows drive letters) logs; one of the three locations also contained the data files. I deleted the Windows player that contained data files and saw a restoring with RMAN. All is well except that redo log members who are found on the occult Windows disk are of course still missing; the database opens, etc., but puts messages like this in the ALERT.log:
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Is how important it?
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See 'Recover after losing a member of a group of Redo Logs online multiplexed'
at http://docs.oracle.com/cd/E11882_01/backup.112/e10642/osadvsce.htm#sthref2205
Hemant K Collette
-
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 21:49Pavel 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 -
Loss/Corruption of a Redo Log multiplex group member
Grid infrastructure: 11.2.0.4
DB version: 11.2.0.4
OS: RHEL 6.5
All recovery logs are multiplexed IE once. Copy of a mirror
I created a document on how to cope with the loss of a member of a group of Redo Log multiplex. It applies to DBs in ASM or Linux Filesystem.
If a member of a multiplex redo logs group is lost/damaged is in State assets or CURRENT (v$ log.status), will be the following work?
Assuming that the DB would not crash (well that's the whole point of multiplexing)
Step 1. Switch redo log group and bring him to the INACTIVE State IE. LGWR is not written for her now
Step 2. Remove the Member lost/damaged.
ALTER DATABASE DROP LOGFILE MEMBER "+ DATA_DG1/mbhsprd/onlinelog/group_1.256.834497203";
Apparently, this command does not actually remove the log file at the level of the ASM/OS; It updates only the control file
Step 3. If it is a corrupt then log file physically remove the damaged location ASM/OS file
Step 4. I hope the below will create a mirror copy of the survivor
ALTER DATABASE ADD LOGFILE MEMBER '+ DATA_DG1/mbhsprd/onlinelog/group_1.256.834497203' to GROUP 3.
The above steps won't work?
There is no point in writing in the document if you do not actually test what you write
It seems that you are working with Oracle managed files. In this case:
You will find that your "apparently" in step 2 is not correct, and that your step 4 will throw an ora-01276.
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I want just the steps if only 1 member of a multiplex group is lost/damaged.
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Group # members
==============
1 2
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3 2
4 2
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6 2
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Hi people,
Version of database - 10.1.0.4.0
Version of the OS - AIX 5.3
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We had 4 groups of log roll forward of any size on the two nodes.yesterday, I added 4 new larger size groups using pl/sql developer tool and deleted the old 2 redolog groups. But I'm not able to remove the rest of the 2 groups of old.
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all redo check journal... from v$ session, v$ logfile, v$ archvied_log
If you mean the idea to determine approximately the size of the log to roll forward... you can check newspaper alerts.
or
ALTER session set nls_date_format = "YYYY/MM/DD HH24:MI:SS;
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version - 11.2.0.1.0
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Kills Sep 08 17:05:34 2015
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Group 3 - D:\APP\ADMINISTRATOR\ORADATA\AWSPROCESS\REDO03. JOURNAL
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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
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the question is:
How can I eliminate this newspaper waiting for redo which is more archived.
Thank you very much for your attentionYou 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] -
Hello
We will soon migrate our database in an environment with active archivelogs. Common sense is, if possible, recovery logs and the archivelogs must reside in independent storage subsystems. But I wanted to know if there is an advantage of performance for storage to different groups of newspapers in the subsystems of storage independent also.
Thank you.Some slightly possible advantage if you have very high Redo write rate.
So, if your 3 groups of Redo Log Online are on Disk_1, Disk_2, and Disk_3 (each being a physical separate disk / disk group), then your ArchiveLogs go to Disk_AL what can happen is
LGWR writes in Disk_1
First group ended and LGWR switches
LGWR began writing at Disk_2
ARC starts to read Disk_1 and write to Disk_AL
Second group ended and LGWR switches
LGWR began writing at Disk_2 - sorry, Disk_3
When ARK ends wrote Group1 to Disk_AL, he now began reading Disk_2In this way, it is there never discord IO disc between LGWR writes a group of newspapers online redo and ARCH read an online Redo Log group - which could happen otherwise, if all the Oneline Redo Log groups are on the same disk / DiskGroup.
This type of design is to 'extreme '!
Published by: Hemant K Collette on May 20, 2009 17:51
Published by: Hemant K Collette on May 20, 2009 22:13
Update of the third LGWR write on disk as Disk_3 -
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
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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.
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
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Windows Server 2008 64 bit - Oracle 11g (11.02.0)
We have our first oracle database implementation.
The go live is supposed to happen in March or April.
Our Oracle courses will begin next week, but because of the performance, I need to change the size of redo log groups.
Users are just load data of the year 2010 in the database, but the performance is terrible.
I would like to know if it is possible to do using the Manager of the company.
I was able to modify the storage spaces and their files, but I don't succeed with redo log groups.
I have 3 groups with 50 MB each. I would change the 500 MB each.
When I try to change groups, it does not open the possibility of change.
Do I have to stop the database? do I have to clean the Group? How can I change the size of them?
EduardoHello
As vmalepati says, you can't resize redo log groups.
Create three new newspaper groups, with the size you need.
As the database is through the loggroups, you will be able to drop the 'old' (small ones).(1) find the instance in OEM
2) enter the tab "Server".
(3) with the 'storage', press 'Redo log groups'
(4) connect the database with a strong user
(5) use the "create as.
(6) change the size and all the other things you need and press "ok".
(7) repeat 5 & 6 until you have the number of new redo log groups you need
(8) remove the old redologs. Choose those showing "inactive".To force a logswitch, newspaper in sqlplus as user hard (System, for example) and run the command
alter system switch logfile;Best regards
Anders. -
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 appreciated806595 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...
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