Can i see dropped object details in redo log files ?

Good morning !
This redo log records all changes made in datafiles.
If i drop any object , How can i check this entry in redo log file ?
Please help me.

HI,
You wrote two places this question . Written in response to this form. Please see: https://forums.oracle.com/thread/2598633
Thank you

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Can I use old dbf, ctl and redo.log files on re-installation? URGENT

Hello,
DB: 10.2.0.1.0
Because of some reasons I am reinstalling Oracle DB in our test server.
Prior to install I removed all files under ORACLE_HOME.
But I am keeping my old datafiles, redo.log & cntrl file.
Is it ok that to define same Database files location where my old files existed?
we have dbf, redo.log, ctl files in that location.
I wonder if I used the same files than I probably do not need to create new data files and also do not need to required import data. This is our test database.
D

If all database files are intact then you can reinstall the Oracle software and just start the pre-existing database. All the files would include the spfile or a copy of the init.ora.
In fact that is one way of doing a version upgrade by overlaying $ORACLE_HOME with the new version. We like to install in a new home since we usually run multiple versions at one time and then start the existing databases using the new release and running the database upgrade scripts one at a time when the release proves stable.
HTH -- Mark D Powell --

Redo log file contents

How can I check the contents of the redo log files?
I recently install 10g. We haven't used the db yet, but the redo logs are very active.
Is there a query to determine what activity is filling the redo log files?
Thank you for any help.
Take Care.
S

The Automatic Workload Repository takes snapshots of
statistics, via scheduled job, at hourly intervals.
This is probably responsible for some of the redo.
You can see if this feature is turned on by checking
the job queue (simply: select * from dba_jobs).
The default settings on AWR can be managed using the
DBMS_WORKLOAD_REPOSITORY built-in package.
Hope this helps.
Kailash.

How does LGWR write redo log files, I am puzzled!

The document says:
The LGWR concurrently writes the same information to all online redo log files in a group.
my undestandint of the sentence is following for example
group a includes file(a1, a2)
group b includes file(b1, b2)
LGWR write file sequence: write a1, a2 concurrently; afterwards write b1, b2 concurrently.
my question is following:
1、 my understanding is right?
2、 if my understanding is right, I think that separate log file in a group should save in different disk. if not, it cann't guarantee correctly recovery.
my opinion is right?
thanks everyone!

Hi,
>>That is multplexing...you should always have members of a log file in more than 1 disk
Exactly. You can keep multiple copies of the online redo log file to safeguard against damage to these files. When multiplexing online redo log files, LGWR concurrently writes the same redo log information to multiple identical online redo log files, thereby eliminating a single point of redo log failure. In addition, when multiplexing redo log files, it is preferable to keep the members of a group on different disks, so that one disk failure will not affect the continuing operation of the database. If LGWR can write to at least one member of the group, database operation proceeds as normal.
Cheers
Legatti

Can't see EJB objects in Application Navigator after migration

Hello
I can't see any objects in Application Navigator after migration from previous version of JDeveloper (9.2.0.5), in System Navigator view I can see all sources. Has somebody any idea what the reason is?
Tom

In the application navigator you should see one node per EJB, when you stand on it you'll see the various source files in the structure window.

What is a redo log file? can anyone explain in simple terms

I am confused between redo log file and physical datafile can anyone explain in simple terms
Thank u
Regards,
Vijay

See Overview of Physical Database Structures

Restore in noarchivelog mode ( redo log files have been dropped )

1, A full backup taken using RMAN is available on disk.
2, The current control files were NOT damaged and do not need to be restored.
3, All data files are damaged .
4, The database is in NOARCHIVELOG mode.
I restore database :
1. RMAN> STARTUP MOUNT
2. RMAN> RESTORE DATABASE;
3. RMAN> recover database;
in this step , I got the information about needing redo log files ; but the redo log
files have been dropped , what should i do ?
else
I want to know there is the command 'recover database using backup control file'
in rman or not ?
Tks

Possibly loss of data (because information in online redo logs is lost):
recover database until cancel;
(cancel immediately)
alter database open resetlogs; (to build a new set of redo logs)
It's not necessary to use a backup controlfile here.

How to remove a redo log file

Hi Experts,
I want to remove a wrong redo log file from 10G R2 database in window.
how to do that without loss data?
my steps as
1. alter system switch logfile;
2. select * from v$log;
which ARC and sataus do I can drop redo log file based on above SQL
no archive and active status?
ALso Which account should I do above action?
fExamp, system account added redo log file, i only
can drop by system? how about sys?
Thanks help in detail steps
Jim
Edited by: user589812 on Dec 23, 2008 4:35 PM

Jim,
Check this link out for how to drop a redo log file
Make sure a redo log group is archived (if archiving is enabled) before dropping it. To see whether this has happened, use the V$LOG view.
http://download.oracle.com/docs/cd/B19306_01/server.102/b14231/onlineredo.htm#i1006489
SELECT GROUP#, ARCHIVED, STATUS FROM V$LOG;
   GROUP# ARC STATUS
        1 YES ACTIVE
        2 NO CURRENT
        3 YES INACTIVE
        4 YES INACTIVE
Drop a redo log group with the SQL statement ALTER DATABASE with the DROP LOGFILE clause.
The following statement drops redo log group number 3:
ALTER DATABASE DROP LOGFILE GROUP 3;

Status of online redo log file INVALID warning appears during online backup

Hi All,
I have a peculiar problem in one of the SAP ECC 6.0 systems. The daily online backup is getting completed with warnings.
Please find below the warnings in DB12 logs:
BR0335W Status of online redo log file /oracle/AS0/mirrlogB/log_g18m2.dbf is INVALID
BR0274W File '/oracle/AS0/mirrlogB/log_g18m2.dbf' not found
BR0335W Status of online redo log file /oracle/AS0/mirrlogA/log_g50_m2.dbf is INVALID
BR0274W File '/oracle/AS0/mirrlogA/log_g50_m2.dbf' not found
BR0335W Status of online redo log file /oracle/AS0/mirrlogB/log_g51_m2.dbf is INVALID
BR0274W File '/oracle/AS0/mirrlogB/log_g51_m2.dbf' not found
BR0335W Status of online redo log file /oracle/AS0/mirrlogA/log_g52_m2.dbf is INVALID
BR0274W File '/oracle/AS0/mirrlogA/log_g52_m2.dbf' not found
BR0335W Status of online redo log file /oracle/AS0/mirrlogA/log_g53_m2.dbf is INVALID
BR0274W File '/oracle/AS0/mirrlogA/log_g53_m2.dbf' not found
BR0335W Status of online redo log file /oracle/AS0/mirrlogA/log_g54_m2.dbf is INVALID
BR0274W File '/oracle/AS0/mirrlogA/log_g54_m2.dbf' not found
BR0335W Status of online redo log file /oracle/AS0/mirrlogA/log_g55_m2.dbf is INVALID
BR0274W File '/oracle/AS0/mirrlogA/log_g55_m2.dbf' not found
BR0335W Status of online redo log file /oracle/AS0/mirrlogA/log_g56_m2.dbf is INVALID
BR0274W File '/oracle/AS0/mirrlogA/log_g56_m2.dbf' not found
BR0335W Status of online redo log file /oracle/AS0/mirrlogB/log_g57_m2.dbf is INVALID
BR0274W File '/oracle/AS0/mirrlogB/log_g57_m2.dbf' not found
BR0335W Status of online redo log file /oracle/AS0/mirrlogA/log_g58_m2.dbf is INVALID
BR0274W File '/oracle/AS0/mirrlogA/log_g58_m2.dbf' not found
BR0335W Status of online redo log file /oracle/AS0/mirrlogB/log_g59_m2.dbf is INVALID
BR0274W File '/oracle/AS0/mirrlogB/log_g59_m2.dbf' not found
For the above mentioned alerts I followed the recommendations of SAP Note 491160. I dropped and recreated the mirrorlog files. But the next day again when I checked the backup it finished with warnings. At the database level there is no problem
SQL> select * from v$logfile;
    GROUP# STATUS TYPE
MEMBER
IS_
        59         ONLINE
/oracle/AS0/origlogB/log_g59_m1.dbf
NO
        59         ONLINE
/oracle/AS0/mirrlogB/log_g59_m2.dbf
NO
    GROUP# STATUS TYPE
MEMBER
IS_
        58         ONLINE
/oracle/AS0/origlogA/log_g58_m1.dbf
NO
        58         ONLINE
/oracle/AS0/mirrlogA/log_g58_m2.dbf
    GROUP# STATUS TYPE
MEMBER
IS_
NO
        57         ONLINE
/oracle/AS0/origlogB/log_g57_m1.dbf
NO
        57         ONLINE
    GROUP# STATUS TYPE
MEMBER
IS_
/oracle/AS0/mirrlogB/log_g57_m2.dbf
NO
        56         ONLINE
/oracle/AS0/origlogA/log_g56_m1.dbf
NO
    GROUP# STATUS TYPE
MEMBER
IS_
        56         ONLINE
/oracle/AS0/mirrlogA/log_g56_m2.dbf
NO
        55         ONLINE
/oracle/AS0/origlogA/log_g55_m1.dbf
NO
        54         ONLINE
/oracle/AS0/origlogA/log_g54_m1.dbf
    GROUP# STATUS TYPE
MEMBER
IS_
NO
        54         ONLINE
/oracle/AS0/mirrlogA/log_g54_m2.dbf
NO
        53         ONLINE
    GROUP# STATUS TYPE
MEMBER
IS_
/oracle/AS0/origlogA/log_g53_m1.dbf
NO
        53         ONLINE
/oracle/AS0/mirrlogA/log_g53_m2.dbf
NO
    GROUP# STATUS TYPE
MEMBER
IS_
        52         ONLINE
/oracle/AS0/origlogA/log_g52_m1.dbf
NO
        52         ONLINE
/oracle/AS0/mirrlogA/log_g52_m2.dbf
NO
    GROUP# STATUS TYPE
MEMBER
IS_
        51         ONLINE
/oracle/AS0/origlogB/log_g51_m1.dbf
NO
        51         ONLINE
/oracle/AS0/mirrlogB/log_g51_m2.dbf
    GROUP# STATUS TYPE
MEMBER
IS_
NO
        50         ONLINE
/oracle/AS0/origlogA/log_g50_m1.dbf
NO
        50         ONLINE
    GROUP# STATUS TYPE
MEMBER
IS_
/oracle/AS0/mirrlogA/log_g50_m2.dbf
NO
         8         ONLINE
/oracle/AS0/origlogB/log_g18m1.dbf
As you can see from the above output at the database level everything is fine. So why during backup it is giving me warnings in DB12. Any help with this regard will be appreciated.
Regards
Mitesh Nair

Hi Joe,
My OS is HP-UX. I dont think its a permission problem. Please find below the contents of origlogA and mirrlogA
predbci2:/oracle/AS0/origlogA#ls -rtl
total 1433712
drwxrwxrwx   2 oraas0     dba             96 Oct 15 03:27 cntrl
-rw-rw----   1 oraas0     dba        104858624 Dec 4 01:50 log_g52_m1.dbf
-rw-rw----   1 oraas0     dba        104858624 Dec 4 03:51 log_g50_m1.dbf
-rw-rw----   1 oraas0     dba        104858624 Dec 4 05:51 log_g54_m1.dbf
-rw-rw----   1 oraas0     dba        104858624 Dec 4 07:52 log_g53_m1.dbf
-rw-rw----   1 oraas0     dba        104858624 Dec 4 09:50 log_g55_m1.dbf
-rw-rw----   1 oraas0     dba        104858624 Dec 4 10:50 log_g56_m1.dbf
-rw-rw----   1 oraas0     dba        104858624 Dec 4 12:41 log_g58_m1.dbf
predbci2:/oracle/AS0/mirrlogA#ls -rtl
total 1433728
-rw-rw----   1 oraas0     dba        104858624 Dec 4 01:50 log_g52_m2.dbf
-rw-rw----   1 oraas0     dba        104858624 Dec 4 03:51 log_g50_m2.dbf
-rw-rw----   1 oraas0     dba        104858624 Dec 4 05:51 log_g54_m2.dbf
-rw-rw----   1 oraas0     dba        104858624 Dec 4 07:52 log_g53_m2.dbf
-rw-rw----   1 oraas0     dba        104858624 Dec 4 09:50 log_g55_m2.dbf
-rw-rw----   1 oraas0     dba        104858624 Dec 4 10:50 log_g56_m2.dbf
-rw-rw----   1 oraas0     dba        104858624 Dec 4 12:41 log_g58_m2.dbf
Regards
Mitesh

Checksum problem in redo log file.

hi,
I hv a checksum problem in my redo log file.
Details.
1. I m unable to open the database but able to mount it.
2. Error says checksum error in current redolog group 2, so can't recover thread 1.
3. Error in group 2 which is active group.
In Mount stage ...
4. I Can't switch group as database is not open.
5. I . can't drop as group is active/current.
6. I can't clear logfile as thread 1 is not recovered.
7. I . can't recover through " Recover Database" command
Pls help,
Thanks in adv.
Rup

Try out these steps provided below, this would make your problem gone.
sql > shutdown immediate ;
sql > startup mount ;
sql > recover database until cance ;
sql > alter database open resetlogs ;
make sure to take database backup
hare krishna
Alok

Multiplexing Redo Log Files question

If you are running RAC on ASM on a RAID system, is this required? We are using an HP autoraid which mirrors at the block level and in the documentation about Multiplexing Redo Log Files it says that you do it to protect against media failure. The autoraid that we are using gives us multiple levels of redundancy against media failure so I was wondering if Multiplexing would be adding more overhead than is needed. Thanks for your input.

ASM is quite compex and I'm not going to outline all the advantages or reasons for ASM, but under ASM you can drop and add devices to maintain your capacity needs online without loosing data, which you cannot do using RAID, which requires a re-initialize, for example, regardless of redundancy. Please see the documentation. ASM, like pretty much everything Oracle will add complexity and you will have to check your requirements. ASM is however pretty much the standard. If you use external RAID, make sure your storage is not using RAID 5 or 0. Regarding logical errors, you could for example overwrite or delete a file by mistake, in which case file redundancy does not protect you. If you are looking for reasons or ways not to use ASM, I'm sure you will find them, but what's the point?

Question about how Oracle manages Redo Log Files

Good morning,
Assuming a configuration that consists of 2 redo log groups (Group A and B), each group consisting of 2 disks (Disks A1 & A2 for Group A and Disks B1 and B2 for group B). Further, let's assume that each redo log file resides by itself in a disk storage device and that the device is dedicated to it. Therefore in the above scenario, there are 4 disks, one for each redo log file and, each disk contains nothing else other than a redo log file. Furthermore, let's assume that the database is in ARCHIVELOG mode and that the archive files are stored on yet another different set of devices.
sort of graphically:
    GROUP A             GROUP B
      A1                  B1
      A2                  B2The question is: When the disks that comprise Group A are filled and Oracle switches to the disks in Group B, can the disks in Group A be taken offline, maybe even physically removed from the system if necessary, without affecting the proper operation of the database ? Can the Archiver process be temporarily delayed until the disks (that were removed) are brought back online or is the DBA forced to wait until the Archiver process has finished creating a copy of the redo log file into the archive ?
Thank you for your help,
John.

Hello,
Dropping Log Groups
To drop an online redo log group, you must have the ALTER DATABASE system privilege. Before dropping an online redo log group, consider the following restrictions and precautions:
* An instance requires at least two groups of online redo log files, regardless of the number of members in the groups. (A group is one or more members.)
* You can drop an online redo log group only if it is inactive. If you need to drop the current group, first force a log switch to occur.
* Make sure an online redo log group is archived (if archiving is enabled) before dropping it. To see whether this has happened, use the V$LOG view.
SELECT GROUP#, ARCHIVED, STATUS FROM V$LOG;
GROUP# ARC STATUS
1 YES ACTIVE
2 NO CURRENT
3 YES INACTIVE
4 YES INACTIVE
Drop an online redo log group with the SQL statement ALTER DATABASE with the DROP LOGFILE clause.
The following statement drops redo log group number 3:
ALTER DATABASE DROP LOGFILE GROUP 3;
When an online redo log group is dropped from the database, and you are not using the Oracle Managed Files feature, the operating system files are not deleted from disk. Rather, the control files of the associated database are updated to drop the members of the group from the database structure. After dropping an online redo log group, make sure that the drop completed successfully, and then use the appropriate operating system command to delete the dropped online redo log files.
When using Oracle-managed files, the cleanup of operating systems files is done automatically for you.
Your Database wont be affected as you can operate with 2 redo log files in each group as The minimum number of redo log files required in a database is two because the LGWR (log writer) process writes to the redo log files in a circular manner. so the process will hang becuase you are having 2 only groups if you want to remove 1 add a third one and make it the current group then 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

Problem in creating database -Missing Redo log file

I am try to create a new database using DBCA .While creating a database it shows the error oracle instance terminated.Force Disconnected.
My alert log file is
Errors in file /u01/app/oracle/diag/rdbms/oracl/oracl/trace/oracl_ora_5424.trc:
ORA-00313: open failed for members of log group 1 of thread 1
ORA-00312: online log 1 thread 1: '/u01/app/oracle/oradata/oracl/redo01.log'
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3
Wed Nov 06 10:07:27 2013
Errors in file /u01/app/oracle/diag/rdbms/oracl/oracl/trace/oracl_ora_5424.trc:
ORA-00313: open failed for members of log group 2 of thread 1
ORA-00312: online log 2 thread 1: '/u01/app/oracle/oradata/oracl/redo02.log'
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/oracl/oracl/trace/oracl_ora_5424.trc:
ORA-00313: open failed for members of log group 3 of thread 1
ORA-00312: online log 3 thread 1: '/u01/app/oracle/oradata/oracl/redo03.log'
ORA-27037: unable to obtain file status
Linux-x86_64 Error: 2: No such file or directory
Additional information: 3
Wed Nov 06 10:07:38 2013
Setting recovery target incarnation to 2
Wed Nov 06 10:07:38 2013
Assigning activation ID 1876274518 (0x6fd5ad56)
Thread 1 opened at log sequence 1
Current log# 1 seq# 1 mem# 0: /u01/app/oracle/oradata/oracl/redo01.log
Successful open of redo thread 1
Wed Nov 06 10:07:38 2013
MTTR advisory is disabled because FAST_START_MTTR_TARGET is not set
Wed Nov 06 10:07:38 2013
SMON: enabling cache recovery
Errors in file /u01/app/oracle/diag/rdbms/oracl/oracl/trace/oracl_ora_5424.trc (incident=1345):
ORA-00600: internal error code, arguments: [kpotcgah-7], [12534], [ORA-12534: TNS:operation not supported
Incident details in: /u01/app/oracle/diag/rdbms/oracl/oracl/incident/incdir_1345/oracl_ora_5424_i1345.trc
Wed Nov 06 10:07:46 2013
Trace dumping is performing id=[cdmp_20131106100746]
Errors in file /u01/app/oracle/diag/rdbms/oracl/oracl/trace/oracl_ora_5424.trc:
ORA-00600: internal error code, arguments: [kpotcgah-7], [12534], [ORA-12534: TNS:operation not supported
Error 600 happened during db open, shutting down database
USER (ospid: 5424): terminating the instance due to error 600
Instance terminated by USER, pid = 5424
ORA-1092 signalled during: alter database "oracl" open resetlogs...
ORA-1092 : opiodr aborting process unknown ospid (5424_47935551851664)
Wed Nov 06 10:07:47 2013
ORA-1092 : opitsk aborting process
251,1 95%

>I am try to create a new database using DBCA
>Please help me to resolve this issue.My redo log file was missing
DROP and recreate the database. It is a *new* database without any data.
Check what datafile locations and redo log file locations you specify when creating the new database. Check if you have permissions and enough disk space.
Hemant K Chitale

Errors reported in alert log file regarding redo log files

Hi,
In my database i see the following entries regarding the redo log files frequently.
Thread 1 advanced to log sequence 88
Current log# 3 seq# 88 mem# 0: D:\ORACLE\PRODUCT\10.2.0\ORADATA\PELICAN\REDO03.LOG
Thread 1 advanced to log sequence 89
Current log# 1 seq# 89 mem# 0: D:\ORACLE\PRODUCT\10.2.0\ORADATA\PELICAN\REDO01.LOG
Thread 1 cannot allocate new log, sequence 90
Checkpoint not complete
I have 3 redo log files of 50MB each. My database is 10g.
What is the reason?
What do i need to do ?
Thanks.

Hi,
It is clearly stated that checkpoint is not complete. Thats why it could not allocate new sequence number to group 1.
We can understand that your redo log group size is insufficient. or increase the number of redo log groups.
Just test adding one more redo log group or test by increasing the size of redo log groups.

How to increase the size of Redo log files?

Hi All,
I have 10g R2 RAC on RHEL. As of now, i have 3 redo log files of 50MB size. i have used redo log size advisor by setting fast_start_mttr_target=1800 to check the optimal size of the redologs, it is showing 400MB. Now, i want to increase the size of redo log files. how to increase it?
If we are supposed to do it on production, how to do?
I found the following in one of the article....
"The size of the redo log files can influence performance, because the behavior of the database writer and archiver processes depend on the redo log sizes. Generally, larger redo log files provide better performance, however it must balanced out with the expected recovery time.Undersized log files increase checkpoint activity and increase CPU usage."
I did not understand the the point however it must balanced out with the expected recovery time in the above given paragraph.
Can anybody help me?
Thanks,
Praveen.

You dont have to shutdown the database before dropping redo log group but make sure you have atleast two other redo log groups. Also note that you cannot drop active redo log group.
Here is nice link,
http://www.idevelopment.info/data/Oracle/DBA_tips/Database_Administration/DBA_34.shtml
And make sure you test this in test database first. Production should be touched only after you are really comfortable with this procedure.

Can i see dropped object details in redo log files ?

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