Backup and Logical Corruption
Hello,
I am running a backup and checking for any logical corruption -
RMAN> backup check logical database;
Starting backup at 03-MAR-10
allocated channel: ORA_SBT_TAPE_1
channel ORA_SBT_TAPE_1: SID=135 device type=SBT_TAPE
channel ORA_SBT_TAPE_1: Data Protection for Oracle: version 5.5.1.0
allocated channel: ORA_SBT_TAPE_2
channel ORA_SBT_TAPE_2: SID=137 device type=SBT_TAPE
channel ORA_SBT_TAPE_2: Data Protection for Oracle: version 5.5.1.0
allocated channel: ORA_SBT_TAPE_3
channel ORA_SBT_TAPE_3: SID=138 device type=SBT_TAPE
channel ORA_SBT_TAPE_3: Data Protection for Oracle: version 5.5.1.0
channel ORA_SBT_TAPE_1: starting full datafile backup set
channel ORA_SBT_TAPE_1: specifying datafile(s) in backup set
input datafile file number=00014 name=/oracle1/data01/TESTDB/TESTDB_compress_test_01.dbf
input datafile file number=00006 name=/oracle/TESTDB/data01/TESTDB_shau_01.dbf
input datafile file number=00015 name=/oracle/product/11.1/dbs/ILM_TOOLKIT_IML_TEST_TAB_A.f
channel ORA_SBT_TAPE_1: starting piece 1 at 03-MAR-10
channel ORA_SBT_TAPE_2: starting full datafile backup set
channel ORA_SBT_TAPE_2: specifying datafile(s) in backup set
input datafile file number=00003 name=/oracle/TESTDB/data02/TESTDB_undo_01.dbf
input datafile file number=00013 name=/oracle/TESTDB/data01/TESTDB_roop_01.dbf
input datafile file number=00012 name=/oracle/TESTDB/data01/TESTDB_example_01.dbf
input datafile file number=00005 name=/oracle/TESTDB/data01/TESTDB_sysaud_tab_1m_01.dbf
channel ORA_SBT_TAPE_2: starting piece 1 at 03-MAR-10
channel ORA_SBT_TAPE_3: starting full datafile backup set
channel ORA_SBT_TAPE_3: specifying datafile(s) in backup set
input datafile file number=00004 name=/oracle/TESTDB/data01/TESTDB_users_01.dbf
input datafile file number=00001 name=/oracle/TESTDB/data01/TESTDB_system_01.dbf
input datafile file number=00002 name=/oracle/TESTDB/data01/TESTDB_sysaux_01.dbf
input datafile file number=00025 name=/oracle/export_files/TESTDB_users_02.dbf
channel ORA_SBT_TAPE_3: starting piece 1 at 03-MAR-10
channel ORA_SBT_TAPE_3: finished piece 1 at 03-MAR-10
piece handle=5ul7ltsd_1_1 tag=TAG20100303T204356 comment=API Version 2.0,MMS Version 5.5.1.0
channel ORA_SBT_TAPE_3: backup set complete, elapsed time: 00:05:15
channel ORA_SBT_TAPE_2: finished piece 1 at 03-MAR-10
piece handle=5tl7ltsd_1_1 tag=TAG20100303T204356 comment=API Version 2.0,MMS Version 5.5.1.0
channel ORA_SBT_TAPE_2: backup set complete, elapsed time: 00:06:56
channel ORA_SBT_TAPE_1: finished piece 1 at 03-MAR-10
piece handle=5sl7ltsd_1_1 tag=TAG20100303T204356 comment=API Version 2.0,MMS Version 5.5.1.0
channel ORA_SBT_TAPE_1: backup set complete, elapsed time: 00:08:16
Finished backup at 03-MAR-10
Starting Control File and SPFILE Autobackup at 03-MAR-10
piece handle=c-2109934325-20100303-0c comment=API Version 2.0,MMS Version 5.5.1.0
Finished Control File and SPFILE Autobackup at 03-MAR-10
Question: By looking at the output, how can I say that RMAN did an Logical Check for the corruption? This output looks same as a simple backup without logical corruption check. Please advice how to check about this?
Thanks!
hi
I think you won't see any summary on this, only when corruption is found.
There is also one related setting that can be incorporated here - see example:
Example 2-25 Specifying Corruption Tolerance for Datafile Backups
This example assumes a database that contains 5 datafiles. It uses the SET MAXCORRUPT command to indicate than no more than 1 corruption should be tolerated in each datafile. Because the CHECK LOGICAL option is specified on the BACKUP command, RMAN checks for both physical and logical corruption.
RUN
+{+
SET MAXCORRUPT FOR DATAFILE 1,2,3,4,5 TO 1;
BACKUP CHECK LOGICAL
DATABASE;
+}+
use this to see clear output:
-- Check for physical corruption of all database files.
VALIDATE DATABASE;
-- Check for physical and logical corruption of a tablespace.
VALIDATE CHECK LOGICAL TABLESPACE USERS;
eg.
List of Datafiles
File Status Marked Corrupt Empty Blocks Blocks Examined High SCN
+1 FAILED 0 3536 57600 637711+
File Name: /disk1/oradata/prod/system01.dbf
Block Type Blocks Failing Blocks Processed
Data 1 41876
Index 0 7721
Other 0 4467
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Questions on Logical corruption
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My DB version is 10g+ - 11.2.0.3 on various different OS. We are in process of deploying RMAN on our system and i am having a hard time on testing/get a grip around the whole logical corruption... from what i understand(please correct me if i am wrong)
1. I can have a check logical syntax in my backup cmd(and that will check both physical and logical corruption)...But how much overhead dose it have, Seems to be anywhere from 14-20% overhead on backup time.
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7. any best practices when it comes for checking logical corruption for DB in 50+ TB
I have actually searched on here and on google, but i could not find any way to reproducing logical corrpution(maybe there is none), but i wanted to ask the community about it....
Thank you in advance for your time.General info:
http://www.oracle.com/technetwork/database/focus-areas/availability/maa-datacorruption-bestpractices-396464.pdf
You might want to google "fractured block" for information about it without RMAN. You can simulate that by writing a C program to flip some bits, although technically that would be physical corruption. Also see Dealing with Oracle Database Block Corruption in 11g | The Oracle Instructor
One way to simulate is to use nologging operations and then try to recover (this is why force logging is used, so google corruption force logging). Here's an example: Block corruption after RMAN restore and recovery !!! | Practical Oracl Hey, no simulate, that's for realz!
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Logical backup and recovery using export/import
Hi,
Anyone provide me the clear steps and command to take logical backup and recovery using the import and export method...??.
im using oracle 9i database and redhat linux server version 4.0.........???.
thanks,
vasanth.......user12864080 wrote:
Hi,
Anyone provide me the clear steps and command to take logical backup and recovery using the import and export method...??.
im using oracle 9i database and redhat linux server version 4.0.........???.
thanks,
vasanth.......Vasant,
Though you have got links already for using the exp/imp , I would strongly suggest that when you mention backup/recovery, RMAN is the tool that you should be using. Exp/imp is/was never considered as a backup tool. You should read this paper to get the answer of "why rman" ?
http://www.evdbt.com/TD_Rman.pdf
Aman.... -
i am using the latest version of itunes. and running ios7 on my iphone 5s.
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I'm a little confused by this?
Final cut now opens if launch older projects. But if I actually click on the project it crashes. Im not sure what you mean by events? I've moved them from the events folder.
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Dv6775us HP Backup and Recovery Manager software corrupted - can't find download
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****Please click on Accept As Solution if a suggestion solves your problem. It helps others facing the same problem to find a solution easily****
2015 Microsoft MVP - Windows Experience Consumer -
In attempting to update my phone software, the program tells me that the backup has been corrupted and needs to be deleated first. How do I do that?
Launch iTunes. Go to Preferences, Devices pane. Click on a backup and click Delete.
-
when i try to make a backup of my iphone, it says here that the backup is corrupt, delete backup and then try again. how do i solve this problem? i cant backup my phone for now, i have no idea how you delete backup. please if anyone could help
Using iTunes on your computer, open Preferences (under the leftmost item in iTunes menu). Choose "Devices" on top. Find your backup listed there, highlight it, and select "Delete Backup".
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Im trying to backup my 3gs on itunes, it syas that the backup is corrupted, to delete and try again. How do i delete?
iTunes prefs > Devices.
Select a backup and delete it.
FYI-> iOS: Transferring information from your current iPhone, iPad, or iPod touch to a new device -
Camera roll empty but shows 6.1 gb. Restored to original settings after backing up. When I restored the backup camera roll still shows 6.1 gb and is still empty. I imagine that the backup contains some corruption
Hi cfgolf,
Thanks for contacting Apple Support Communities. I agree with your assessment that something is going on with that previous backup. If you restored from that backup and the issue continues, I would recommend restoring and Set up as new. Before you restore, make sure you Transfer content so that you can sync it back after setting up as new. The instructions on how to Transfer content and Set up as new are both listed in this article.
iOS: How to back up your data and set up your device as a new device
http://support.apple.com/kb/ht4137
2. Transfer content
Before you erase your device, take a few minutes to transfer your content from your device to your computer to ensure that all your critical data is safe.
6. Set up as new
Complete the setup assistant. When prompted to set up your device, select Set Up as New iPhone and tap Next to continue.
Skip the Apple ID sign-in, in case the original issue was related to any of your content on iCloud.
Note: After setting up as new, you will need to enter the Visual Voicemail password for iPhone (on carriers that support Visual Voicemail). If you've forgotten the password, contact your carrier to help you reset it.
After erasing and setting up as a new device, your device is now in a factory configuration. Test to determine if erasing and setting up as a new device resolved the issue. Content on the device may have caused unexpected behavior.
If the issue is still present, you may want to contact Apple Support.
If the issue is now resolved, sync one type of content at a time back to the device. For example, if you had an issue playing music, add songs from iTunes and confirm they will play. If your contacts weren't loading successfully, add the contacts back. After each sync, test to see if the issue has returned.
Cheers,
-Joe -
Physical and logical data corruption - use case approach
Hi, can anyone advise me any book or other source where data loss situations are well defined and confronted with oracle backup and recovery solutions ? I mean something what considers many cases and brings solution analysis.
I don't want anything that starts with oracle mechanisms. I want something that starts with a problem to solve and shows how these mechanisms can be helpful in this case.
Edited by: 874392 on 2011-07-22 07:01also you can start with oracle documentation
1.basic and recovery basics and
2.backup and recovery advanced user's guide
if you would like refer
Oracle8i Backup & Recovery by Rama Velpuri
http://www.amazon.com/Oracle8i-Backup-Recovery-Rama-Velpuri/dp/product-description/0072127171 -
How do I delete the current backup file of iphone in itunes?
(This is a really old thread, but I'm answering anyhow because I see 11 "I have this question too!" )
If you go to the iTunes Preferences menu, there should be a "Devices" tab. In the Devices section, you'll see a list of all of your devices' backups and you can delete the problematic one.
If you don't see the backup, see the section "Where Your Backups Are Stored" on this support page: Create and delete iPhone, iPad, and iPod touch backups in iTunes - Apple Support -
Logical corruption found in the sysaux tablespace
Dear All:
We lately see the logical corruption error when running dbverify command which shows the block corruption. It is always on the the sysaux tablespace. The database is 11g and platform is Linux.
we get the error like:error backing up file 2 block xxxx: logical corruption and this comes to alert.log out of the automated maintenance job like sqltunning advisor running during maintenance window.
Now As far as I know,we can't drop or rename the sysaux tablespace. there is a startup migrate option to drop the SYSAUX but it does not work due to the presence of domain indexes. you may run the rman block media recovery but it ends with not fixing since rman backups are more of physical than maintain the logical integrity.
Any help, advise, suggestion will be highly appreciated.If you let this corruption there then you are likely to face a big issue that will compromise database availability sooner or later. The sysaux is a critical tablespace, so you must proceed with caution.
Make sure you have a valid backup and don't do any thing unless you are sure about what you are doing and you have a fall back procedure.
if you still have a valid backup then you can use rman to perform a db block level recovery, this will help you in fixing the block. Otherwise try to restore and recover the sysaux. In case you cannot fix the block by refreshing the sysaux tablespace then I suggest you to create a new database and use aTransportable Tablespace technique to migrate all tablespaces from your current database to the new one and get rid of this database.
~ Madrid
http://hrivera99.blogspot.com
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