Recovery of Database -- Restore from Cold Backup
Hi All
I was trying to understand the possible failures so as to enhance my recovery capabilities of Oracle database 10.2.0.4.
We take weekly hot back up of the database on every sunday including archive logs. Archive logs are also backed up when the log_archive_dest_1 disk space utilization grows beyond 80%. All the backup goes into an alterate disk made available on the host. The archive back up is triggered mostly twice a week, on one of the thursday/friday/Saturday depending on the redo generation in that week.
Imagine we have a failure on thursday leading me to restore the complete database from backup taken on the earlier sunday. I also realise there is 1 archive log from tuesday missing and its not backed up for sure. I restore from backup and try to recover. As all the archive logs are available since Sunday till the point of failure except for that one missing file from Tuesday, I want to recover the database until the point of failure although there is one log sequence missing in archive destination. how can I do that? Is it possible? Please advice.
I remember reading on net that recover database command can be hinted by an init parameter so as it does not check for sequece numbers and continue to apply archives (does not check sequence numbers) as they are available. But I am not able to recollect it exactly. while I was searching on net, I came to this forum hoping if some one knew it.
Let me know if you know how to go about this. Thanks in advance.
Sarat.
You cannot skip an archivelog (there is no init parameter to do so).
Think about this :
Imagine that there is one very long transaction. A transaction that deletes or updates 1 million records. With the redo logs being, say, 100MB each, the transaction spans multiple redo logs.
These redo logs are archived as, say, sequence #121 to 128.
Supposing that sequnece #123 is deleted by mistake.
Can you recover the database with sequence# 121, 122, 124-128 ? Can that transaction be consistent ?
OR think about this :
A redo log file is 99% full. A transaction for 1000 rows begins. All the redo entries for that transaction do not fit into that last 1%. The transaction spans into the next redo log file.
Can recovery be done with either of these missing ?
If you think through these scenarios, you will see that there will almost always be transactions spanning redo logs. That means, that you cannot skip redo logs during recovery.
Hemant K Chitale
http://hemantoracledba.blogspot.com
Similar Messages
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Database Restore from COLD Backup
Dear all,
I .m trying to restore a production database from a COLD backup. Before the COLD BAckup, we have take a HOT backup as usual and then shutdown the database to perform the Cold Backup.
After restirong all the oracle files and arch redo log, i have tried to restart the datbase but it failed with the followgin error message:
SVRMGR> connect internal
Connected.
SVRMGR> startup
ORACLE instance started.
Total System Global Area 625729520 bytes
Fixed Size 69616 bytes
Variable Size 133795840 bytes
Database Buffers 491520000 bytes
Redo Buffers 344064 bytes
Database mounted.
ORA-01113: file 1 needs media recovery
ORA-01110: data file 1: '/usr/oracle/8.1.6/disk1/IF1/system01.dbf'
SVRMGR> exit
Server Manager complete.
root@dbserver#su - oracle
Sun Microsystems Inc. SunOS 5.8 Generic Patch October 2001
Then i have recovered but it seems that the Oracle process do not started and here is what i have found in alert log file:
Errors in file /usr/oracle/8.1.6/admin/IF1/bdump/if1_smon_609.trc:
ORA-00600: internal error code, arguments: [4194], [52], [52], [], [], [], [], []
Mon Mar 8 11:42:46 2004
Recovery of Online Redo Log: Thread 1 Group 1 Seq 29954 Reading mem 0
Mem# 0 errs 0: /usr/oracle/8.1.6/disk2/IF1/redo1a.rdo
SMON: terminating instance due to error 600
Instance terminated by SMON, pid = 609
WARNING! Recovering data file 1 from a fuzzy backup. It might be an online
backup taken without entering the begin backup command.
WARNING! Recovering data file 2 from a fuzzy backup. It might be an online
backup taken without entering the begin backup command.
WARNING! Recovering data file 3 from a fuzzy backup. It might be an online
backup taken without entering the begin backup command.
WARNING! Recovering data file 4 from a fuzzy backup. It might be an online
backup taken without entering the begin backup command.
WARNING! Recovering data file 5 from a fuzzy backup. It might be an online
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WARNING! Recovering data file 7 from a fuzzy backup. It might be an online
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WARNING! Recovering data file 8 from a fuzzy backup. It might be an online
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WARNING! Recovering data file 9 from a fuzzy backup. It might be an online
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WARNING! Recovering data file 26 from a fuzzy backup. It might be an online
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WARNING! Recovering data file 27 from a fuzzy backup. It might be an online
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WARNING! Recovering data file 29 from a fuzzy backup. It might be an online
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Media Recovery Log
Could someone explain to me what i did wrong?
Thank you
ORA-01113
ORA-01110
ORA-00600: internal error code, arguments: [4194], [52], [52], [], [], [], [], []Please do not confuse between the backup copies you have. Ensure that you have the latest copy whether cold or hot. If you have COLD copy then simply replace all the data files, redo log files, and the control files and start the database it should start. I do not understand your back up strategy because if you have a Hot backup then why do you need a cold backup. Please let me know in what mode your database is running?
Regards,
DJ -
Restore from cold backup (rac server)
Hi All,
Oracle version : 10g
OS : SunOS dixie1 5.10 Generic_118855-36 i86pc i386 i86pc
I am having cold backup of RAC server (2 nodes), I want to restore from cold backup.
The problem is that : when i performed the cold backup using rman at that time Oracle was having 3 ASM diskgroups.But unforunately that disk is no more in use due to some fault.
Now my question is how can i restore from the cold backup as when i'll restore from the cold backup this will ask for the same ASM diskgroups.Even more if i creates the same diskgroup with the same name and same configuration then my doubt is that rman will allow me to restore the same from the cold backup as ASM disk header changed now ?
Thanks,
VipinVipinK wrote:
Hi All,
Oracle version : 10g
OS : SunOS dixie1 5.10 Generic_118855-36 i86pc i386 i86pc
I am having cold backup of RAC server (2 nodes), I want to restore from cold backup.
The problem is that : when i performed the cold backup using rman at that time Oracle was having 3 ASM diskgroups.But unforunately that disk is no more in use due to some fault.
Now my question is how can i restore from the cold backup as when i'll restore from the cold backup this will ask for the same ASM diskgroups.Even more if i creates the same diskgroup with the same name and same configuration then my doubt is that rman will allow me to restore the same from the cold backup as ASM disk header changed now ?
Yes.You can do these and restore/recover your database.First you need startup your ASM instance then create your ASM disk groups and do following:
1.Edit pfile and change controlfile location to diskgroup(Consder that +dgr1)
2.Restore controlfile to this disk group using backup of controlfiles(you say that is cold backup)
rman target /
/*Instance need starting up from pfile*/
startup nomount ;
/*then restore controlfile,give full path of controlfile from coldbackup*/
restore controlfile from 'coldbackup_location\coltrolfile';
alter database mount;
catalog start with 'coldbackup_location';
backup as copy database format '+dgr1';
switch database to copy;
alter database open; -
Database refresh from cold backup and hotbackup.
How can we perform Database refresh from cold backup and hotbackup?
OracleM wrote:
How can we perform Database refresh from cold backup and hotbackup?I understand that you have Cold/hot backup and you need recover(refresh) this backup?If yes then restore cold/hot backup and
sqlplus "/as sysdba"
startup mount;
recover database using backup controlfile unil cancel;
/*then apply all available archive logs*/
alter database open resetlogs; -
ORA-00313: open failed for members during restore from COLD backup
Hi all,
I took a cold backup of an 11.1 database using RMAN (database in mount state).
I used the following command to restore it:
restored the controlfile and then
RESTORE DATABASE FROM TAG 'TAGxxxxxxxxxx';
Now I'm restoring it and it's taking too much time. When checking alert log it says:
ORA-51106: check failed to complete due to an error. See error below
ORA-48318: ADR Relation [HM_FINDING] of version=3 cannot be supported
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RMAN is still in progress, why does it complain about redo?
I'm not doing recovery since it was a cold backup.
Thanks in advance.Hi Michael,
Yes, it's the correct one because it says "full restore complete":
ORA-00312: online log 1 thread 1: '/oracle1/oradata/******/redo1_01.log'
ORA-27037: unable to obtain file status
HPUX-ia64 Error: 2: No such file or directory
Additional information: 3
Tue Apr 30 14:38:14 2013
Full restore complete of datafile 32 /oracle1/oradata/******/apr_sesm_index_01.dbf. Elapsed time: 1:25:42
checkpoint is 12652187135448
last deallocation scn is 12651877642745
Tue Apr 30 15:38:04 2013
Full restore complete of datafile 34 /oracle1/oradata/******/apr_stage_data_01.dbf. Elapsed time: 6:42:52
checkpoint is 12652187135448
last deallocation scn is 12651877637877
thanks, -
A question about restoring from cold backup(control file backup not clear)
Hi,
I had another question about restoring the cold backup. My database is in noarchivelog mode and after taking a consistent cold backup, all I need to do is to restore the backup right? -Why I got this question is because: when I backup my control file to trace, I see statements like this:-----
-- Commands to re-create incarnation table
-- Below log names MUST be changed to existing filenames on
-- disk. Any one log file from each branch can be used to
-- re-create incarnation records.
-- ALTER DATABASE REGISTER LOGFILE '/uo1/app1/arch1_1_647102958.dbf';
-- Recovery is required if any of the datafiles are restored backups,
-- or if the last shutdown was not normal or immediate.
RECOVER DATABASE
-- Database can now be opened normally.
ALTER DATABASE OPEN;
My database is in noarchivelog mode now so don't know why these statements (of register the logfile) is there in the backup of control file? so when I restore the cold backup of this database, it will still work correct? (there is no logfile I have only CRD files in cold backup -no archive log files.)
thanks
NiravThanks for your inputs! It is most useful to me.
Regards
Nirav -
Test Restore Database Instance from Cold backup
Hi - I have a customer who is using an Oracle database instance not in archivelog mode
currently, I have managed to persuade them to backup at least weekly using an RMAN cold backup.
Prior to my being allowed to do anything else they want to perform a test restore from the cold backup
I want to find a simple procedure to do this which will enable me to tick the box then hopefully I may be able to persuade them that Hot Backups are the way to go.
Has anyone got any good suggestions for this please?Ah if only things were quite so simple - my hands are tied somewhat there isn't a second machine available at the moment so I was hoping to be able to run a test restore to the same machine !
No they do not worry about data in this situation - Oracle is used almost as a query engine maybe a very odd solution as the actual data is not really held within this oracle database but the resultant queries are!
Anyway I think I will just do a virtual restore using the restore database validate command then armtwist a couple of managers!
One of the areas they had difficulty with is that apparently they had archivelogging on but the rate of writing archivelogs was huge and it was affecting performance. I am not knowledgeable enough to know how to tune that problem!! -
RMAN Restore from cold backup ?
Hi ,
I am trying to restore the database from production db using the RMAN cold Backup. Both the prod and test(Restore database) are on the same machine. And also I wanted to have the restore db name should be different.
And the restore db name should be different. What are the options I have ?refer the thread:-
RMAN Restore using RMAN COLD Backup!!
RMAN Restore using RMAN COLD Backup!! -
Partial restore from Cold backup
Hi,
I want to create a copy of our dev database to another server.
We have Oracle 10.2.0.4 server running on Solaris 10 OS.
This database is @ 120GB in size and has got lots of application data.
Now I want to create a copy of this DB without having the application data.
Can I do the following?
1. Take cold backup of this database.
2. copy the oracle binaries, controlfile, logfile to target server.
3. copy the datafiles only for SYSTEM, UNDO, TEMP and SYSAUX tablespace to target.
4. restore / create the new database? - will you pls provide me the steps for this?
Thanks,
DRHi,
In order to create a clone of your dev database trough the copy procedure you have to follow these steps:
1. Take a cold backup of your database files (and i mean ALL the files: controlfile, data files, etc)
2. Take a "cold" backup of oracle binaries (with your instance down, copy $ORACLE_HOME dir)
3 You have to ensure you have the directory structure in the new server.
4. The new server must accomplish with all the libraries requiered for clean installation (that's because you have to relink oracle binaries)
5. Once the oracle binaries are in $ORACLE_HOME, run "relink all". If everything is fine, you don't have to see any errors; if not, check the log.
6. After a succesful relink, you have to copy the database files on their corresponding directories.
7. Start the instance.
I know, it's not a friendly process, but it works.
I offer you another way.
1. Install another engine (same as your dev server).
2. Clone your dev database with one of the following procedures:
2.a. RMAN Clone
2.b. Directly import with oracle data pump.
regards -
ORA-00314 - Restoring from Cold Backup. ( Redologs on Raw Disk startup)
Greetings,
We're running Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - 64bit Production ( Solaris Sparc )
we've recently switched to redologs on raw disks to improve DB write performance. Have taken a cold backup of db , But db denies to open normally after restoration.
Any ideas what could be wrong? and how to fix this?
TIA,
SQL> startup;
ORACLE instance started.
Total System Global Area 1.0737E+10 bytes
Fixed Size 1996520 bytes
Variable Size 3640658200 bytes
Database Buffers 7063207936 bytes
Redo Buffers 31555584 bytes
Database mounted.
ORA-00314: log 1 of thread 1, expected sequence# doesn't match
ORA-00312: online log 1 thread 1: '/dev/rdsk/c1t4d0s3'
ORA-00312: online log 1 thread 1: '/dev/rdsk/c1t5d0s3'Try this ..
First i create a backup of control file:
SQL> alter database backup controlfile to trace;
Database altered.
Then i check udump directory. There are some trace files To find out which one contains control file, i simply make a text search :
testdb oracle@aurora:/data06/app/oracle/admin/testdb/udump> grep 'CREATE CONTROLFILE REUSE DATABASE' *.*
testdb_ora_181267.trc:CREATE CONTROLFILE REUSE DATABASE "testdb" NORESETLOGS NOARCHIVELOG
testdb_ora_181267.trc:CREATE CONTROLFILE REUSE DATABASE "testdb" RESETLOGS NOARCHIVELOG
I execute the commands which is included with CREATE CONTROLFILE REUSE DATABASE
SQL> startup nomount
ORACLE instance started.
Total System Global Area 314572800 bytes
Fixed Size 1302944 bytes
Variable Size 106700384 bytes
Database Buffers 205520896 bytes
Redo Buffers 1048576 bytes
SQL> CREATE CONTROLFILE REUSE DATABASE "testdb" RESETLOGS NOARCHIVELOG
2 MAXLOGFILES 4
3 MAXLOGMEMBERS 4
4 MAXDATAFILES 1000
5 MAXINSTANCES 1
6 MAXLOGHISTORY 4544
7 LOGFILE
8 GROUP 1 '/data07/oradata/testdb/redo01.log' SIZE 50M,
9 GROUP 2 '/data07/oradata/testdb/redo02.log' SIZE 50M,
10 GROUP 3 '/data07/oradata/testdb/redo03.log' SIZE 50M
11 DATAFILE
12 '/data07/oradata/testdb/system01.dbf',
13 '/data07/oradata/testdb/undo01.dbf',
14 '/data07/oradata/testdb/sysaux01.dbf',
15 '/data07/oradata/testdb/users01.dbf',
16 '/data07/oradata/testdb/data01.dbf',
17 '/data07/oradata/testdb/work01.dbf',
18 '/data07/oradata/testdb/ascs01.dbf',
19 '/data07/oradata/testdb/uccs_data01.dbf',
20 '/data07/oradata/testdb/uccs_index01.dbf'
21 CHARACTER SET WE8ISO8859P9
22 ;
Control file created.
Then recover db.
SQL> RECOVER DATABASE USING BACKUP CONTROLFILE -
How to do media recovery from cold backup?????????/
Hi
i take cold backup of my 9i database ....
in case my database is up .....
how will i recover my database if i lose a single database file and i want to recover it from cold backup......
Thanks in advance
GaganHere you go
These are the steps:
1. Restore the lost file from a backup.
2. If the database is down, mount it.
SVRMGR> STARTUP MOUNT PFILE=<location_of_pfile>;
3. Issue the following query:
SVRMGR> SELECT V1.GROUP#, MEMBER, SEQUENCE#,
FIRST_CHANGE#
FROM V$LOG V1, V$LOGFILE V2
WHERE V1.GROUP# = V2.GROUP# ;
This will list all your online redolog files and their respective
sequence and first change numbers.
4. If the database is in NOARCHIVELOG mode, issue the query:
SVRMGR> SELECT FILE#, CHANGE# FROM V$RECOVER_FILE;
If the CHANGE# is GREATER than the minimum FIRST_CHANGE# of your logs,
the datafile can be recovered. Just keep in mind that all the logs to
applied will be online logs, and move on to step 5.
If the CHANGE# is LESS than the minimum FIRST_CHANGE# of your logs, the
file cannot be recovered. Your options at this point would be to restore
the most recent full backup (and thus lose all changes to the database
since) or recreate the tablespace as explained in scenario a.
5. Recover the datafile:
SVRMGR> RECOVER DATAFILE '<full_path_file_name>'
6. Confirm each of the logs that you are prompted for until you receive the
message "Media recovery complete". If you are prompted for a non-existing
archived log, Oracle probably needs one or more of the online logs to
proceed with the recovery. Compare the sequence number referenced in the
ORA-280 message with the sequence numbers of your online logs. Then enter
the full path name of one of the members of the redo group whose sequence
number matches the one you are being asked for. Keep entering online logs
as requested until you receive the message "Media recovery complete"
7. If the database is at mount point, open it. -
Hi,
We take Hot backup everyday, but I took a cold backup using the same catalog. If I want to restore the cold backup I took, what is the proceedure. We are running on 10g in HP Unix.
Thanks.Hi Rock2,
If you want to restore the cold backup you need to know the tag belonging to this backup.
Using the logfile of the coldbackup or <list backup summary;> in rman you should be able to get this info.
The restore would be similar as:
connect catalog rman/pwd@define_rcv;
# check in catalog database for the dbid.
# If so set the appropriate dbid by unhashing the line directly below using the current dbid
# set dbid = define_dbid
connect target /;
STARTUP NOMOUNT;
run {
allocate channel tc1 type 'SBT_TAPE'; # or 'DISK'
allocate channel tc2 type 'SBT_TAPE'; # or 'DISK'
# adjust the TAG in the following lines
restore controlfile from tag TAG0000001;
sql 'alter database mount';
restore database from tag TAG0000001;
sql 'alter database open resetlogs';
release channel tc1;
release channel tc2;
Regards,
Tycho -
How to Create new database from cold backup files.
Dear Experts,
I have an oracle 10g databae on windows 2003 server.
The database is in Archive log mode and backup strategy is Taking cold backup ever night.
Backup steps:
shut down database.
copy data files, control files, redo logs, archive logs and parameter files to safe location.
Startup.
I have taken a backup at Tuesdaay 1AM and I have archive logs also.
On Wednesday, I want to Create a new database on another server with the available cold backup files and archive logs. I want to recover the database upto 4PM Wednesday. How can I do this.
I am not using control file auto backup or control file backup to trace.
Please help me how can I do this. I am new to oracle database Administration.
--ThanksThe steps :
shut down database.
copy data files, control files, redo logs, archive logs and parameter files to safe location -- you mean the alternate location for the new databaseare correct (except that I would say "alternate location for the new database").
If you do not have controlfile backups, you cannot either OPEN the database or RECOVER the database until and unless you CREATE the Controlfiles. You have to generate a CREATE CONTROLFILE script using a BACKUP CONTROLFILE TO TRACE from the Production serer and create the controlfile on the new server.
BEFORE the Startup, I would use
RECOVER DATABASE USING BACKUP CONTROLFILE UNTIL CANCEL;The "using backup controlfile" tells Oracle to continue attempting Recovery -- ie doing a RollForward -- till the last archivelog made available to it.
For the Recover command, you then keep applying the ArchiveLogs from the Tuesday 1am ColdBackup upto Wednesday 4pm.
Once you have applied the last ArchiveLog, you do an
ALTER DATABASE OPEN RESETLOGS;Here are my notes of doing a RollForward "Recovery" from a Cold Backup :
http://hemantoracledba.blogspot.com/2007/05/rollforward-from-cold-backup.html
If you are attempting all these steps on a different server from your current Production database, you should be safe.
Once you OPEN the database, you can use CREATE CONTROLFILE or the NID utility to rename the database.
If you are attempting to create the new database on the same server there are many other precautions you have to take and unless you have experience with cloning databases, I would advice you against doing so (only the RMAN DUPLICATE DATABASE command has a safer method of cloning a database).
Hemant K Chitale
http://hemantoracledba.blogspot.com -
Restoring tigger from cold backup.
Hi
I have one problem..... recently i have drooped 1 trigger by mistake of one of my user in database. Now the problem is... we never take the logical backup of that DB.
Backup mechanism of the database is Cold Backup and size is *2TB*.
Now i have to restore that trigger from the cold backup with minimum effort , do i have to create the Clone database with the Cold backup using all the datafiles ...? or System tablespace ( or datafile) and default Schema tablespace(Schema which holds the trigger and its tables) in enough for restoring the trigger ?
I hope i am clear with my question. please let me know if you need more details.
Please suggest some best and fast way to solve this problem.
Thanks,You need to restore enough to OPEN the DB can you please elaborate this clearly....
The version is :
Oracle Database 11g Release 11.1.0.7.0 - 64bit Production
PL/SQL Release 11.1.0.7.0 - Production
CORE 11.1.0.7.0 ; Production
TNS for Linux: Version 11.1.0.7.0 - Production
NLSRTL Version 11.1.0.7.0 - Production I have dropped in this Monday. Flashback is not implemented.
Edited by: user10915512 on May 10, 2011 7:15 AM -
iPhone 4 went into recovery mode when trying to restore it. Now the only option iTunes allows is for "restore & upgrade", it is not offer an option to restore from a backup, says that must first do the upgrade, when attempting to do the upgrade the iPhone won't accept it.
How can I restore from a back up in recovery mode when the only option is "restore and upgrade"?
Please help.You don't you must restore your phone first and then you will have the option to restore from your backup.
If you can't update or restore your iPhone, iPad, or iPod touch - Apple Support
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