How to tell tablespace is in backup mode?

Ive issued the command:
alter tablespace example begin backupMy problem is that I can't find a table/view that shows the tablespace is now in backup mode. Is there somewhere I can find this information?
Regards,
Warren

Hi,
U can check from v$backup about the status of the tablespace which is under begin backup mode.

Similar Messages

How to exclude tablespace UNDOTBS1 from backup in OEM

I use OEM to backup our database (11.2 on Redhat 2.6.18-92.el5 ). It take quite a bit time and disk space (32gb) to backup the UNDOTBS1 table space. I do not think that we need undo tablespace for a recovery. If this is correct how can I excludeit from the backup. OEM allow to exclude data tablespace from backup but not UNDOTBS1.
Thanks

To create a physical standby you need the entire database. Not just parts of it. The only thing at the standby system that will be different is the controlfile (it will be a standby controlfile) and the spfile. Everything else will be exactly the same. Locations of the files can differ of course if you set the appropriate parameters.
Please make sure you have read Chapter 3 "http://download.oracle.com/docs/cd/E11882_01/server.112/e10700/create_ps.htm#i63561" of the Data Guard Concepts and Administration manual.
You can use the RMAN qualifier FROM ACTIVE DATABASE to the DUPLICATE FOR STANDBY command to avoid the need for interim storage for the backup. That method streams the backup from the Primary directly into the standby server. Refer to Chapter 2 of our book "Oracle Data Guard 11g Handbook (http://www.amazon.com/Oracle-Guard-Handbook-Osborne-ORACLE/dp/0071621113)" for details.
Since you are using OEM, make sure you are using 10.2.0.4/5 Grid Control. The Data Guard standby creation wizard has a new option to use this RMAN option. It is the first selection on the type of backup page. (To get to the DG pages select your Primary database from the Database Targets page and then select the Availability tab, and then under Data Guard select the Add Standby Database link).
As for block change tracking, since we all thought you were just doing a backup and did not realize you were trying to create standby BCT can help make it faster. However it does not apply in this case.
Larry

How to restore TABLESPACE not in backup set?

I was playing with RMAN on one of my test databases. Here's what I did.
1) Performed full backup on an ARCHIVELOG enabled database
2) I created a table space named TBLSP
3) shutdown the database
4) Corrupted the only data file in TBLSP
5) startup
As you all guessed database won't open. I was pretty sure that if I restore last full backup and roll archive logs forward, I would be able to recover my corrupted tablespace.
6) rman target /
7) restore datafile 'D:\oracle\oradata\training\tmptbl01.dbf';
8) I get
RMAN-06023: no backup or copy of datafile 14 found to restore
9) Then I tried following and both worked(?) fine.
RMAN> RESTORE DATABASE UNTIL TIME "TO_DATE('09/04/2006 12:20:00','MM/DD/YYYY HH:MI:SS')";
RMAN> RECOVER DATABASE UNTIL TIME "TO_DATE('09/04/2006 12:20:00','MM/DD/YYYY HH:MI:SS')";
10) Now I can do ALTER DATABASE OPEN RESETLOGS;
Database is opened but I lost tblsp tablespace. What should I do to recover corrupted tablespace until its last consistent state.
Thanks...

From the error you received, I would assume you are not on 10g?
If you are on 10g, once you determine the tablespace containing the corrupted datafile, you could rename the datafile on the file system and issue the following in RMAN:
RMAN> startup mount;
RMAN> restore tablespace tblsp;
RMAN> recover tablespace tblsp;
RMAN> alter database open;or
RMAN> startup mount;
RMAN> restore datafile <corrupt_datafile_#>;
RMAN> recover datafile <corrupt_datafile_#>;
RMAN> alter database open;

The Consequences of putting a tablespace into Hot Backup mode--Link to Doc

http://www.dizwell.com/prod/node/10
This article will help beginners who want to know what exactly happens when the Tablespace is put in Backup mode

Good point.
If we only know Enterprise Manager, we will be stuck when confronted with a telnet session. In like manner, if we only know RMAN, we will never know half of why it is so useful and efficient.
Besides which, there is a lot of use for manual recovery techniques, even in a world of RMAN doing all the backups, so knowing the entire backup/recovery universe is a Good Thing.

How SCN sync after the tablespace is put back to END Backup mode

When we put the tablespace in begin backup mode, the scn get forzen and it will not be further updated, until it is put back to end backup.
Question is : If at the time of being backup , say the snc forzed at 45. Before we put back the tablespace to end back up , we had genrerated 10 SCN. Then the current scn is 55. If we put the tablespace in end backup , does the datafile will start with scn 56 ( by maintaint it previous scn at 45)
Or after we put back the tsp in end back up , does the datafile will be updated from 46 to 55 , before it is updated with scn 56.
In the above example i am considering by db has one datafile only.
Thanks
Naveen

Are you implying that the "Checkpoint number" is a different series of numbers --
seperate from SCNs ?
Are you implying that when a checkpoint occurs it is this "Checkpoint number"
that is incremented and written to the datafile headers ?
There really is no such thing as a "Checkpoint number".
If you look at the definitions of V$DATABASE , V$DATAFILE and V$DATAFILE_HEADER, you would see that a Checkpoint increments the SCN.
A header can have multiple entries -- a Checkpoint SCN (called CHECKPOINT_CHANGE#) , ArchiveLog SCN (called ARCHIVELOG_CHANGE#),
the Current SCN (called CURRENT_SCN), SCN of last Unrecoverable (Nologging)
(called UNRECOVERABLE_CHANGE#) etc etc. They are all derived from SCNs
only.
The SCN is used as the single point of reference. Thus, we can compare
CHECKPOINT_CHANGE# with CURRENT_SCN with UNRECOVERABLE_CHANGE# etc.

Update & select query when tablespace in backup mode

Hi,
I have a query related to the DML statement when tablespace is in backup mode. Suppose when put the tablespace in begin backup mode then during the time one user run an update statement against this tablespace and commit the transaction and other user run the select query on the same data then which image the user will get and from where the data will be taken to display.
steps:
alter tablespace users begin backup;
update emp set sal=4000 where empno=101;
commit;
select * from emp where empno=101;
Now what result user will get and from where the data will fetch.
Thanks,
Gulshan

Hi,
alter tablespace users begin backup;
update emp set sal=4000 where empno=101;
commit;
select * from emp where empno=101;AFAIK, the database would work normally and you will not find the difference from transactions perspective. If you check from Oracle architecture and process, fuzzy bit will be setted at up and additional redo vectors would be saved up in the online redo logs - due to which size of redo would higher when compared to normal transactions. Secondly, you must be worried about the backup - which might not be consistent. So better opt for RMAN instead of User managed Backups.
- Pavan Kumar N

Blocking session in hot backup mode?

In 8.1.7.4 Some time While in hot backup mode, blocking session occuring by checkpoint session background process. Can we issue the alter system checkpoint command in this
Situation ? how to handle this?

best way is to try and see but checkpointing frequently wont help in my opinion, a better workaround may be ensuring you only place one tablepspace at a time in backup mode and bring the tablespace out of backup mode as soon as you have backed it up.

Where do changed data values goto if DB is in BACKUP mode for LONG PERIODs

Where does oracle write if put the database in begin backup mode for LONG PERIODs. Lets say I issued a "ALTER DATABASE BEGIN BACKUP" command in a busy database and forgot about it for a long time.
I understand that when the DB IS IN BEGIN BACKUP MODE, "the database copies whole changed data blocks into the redo stream." (Page 503 of 11.1 backup and recovery guide). But the redo stream is limited by the number of online redologs. After some time redologs also wont be sufficient for the changed data values after a begin backup is issued. I understand that there are archived redologs.
Lets say there are 2 redolog groups in this database and Lets say 10 archive log files got generated since the ALTER DATABASE BEGIN BACKUP was issued.
When i finally issue the "ALTER DATABASE END BACKUP" command, will Oracle sync the datafiles with the changed data blocks reading the data from these 10 archived log files ? What happens if i delete these archive redologs from the archive log destination. ??
page 504 of 598 in the backup and recovery guide
Caution : If you fail to take the tablespace out of backup mode,
then Oracle Database continues to write copies of data blocks in
this tablespace to the online redo logs, causing performance
problems. Also, you receive an ORA-01149 error if you try to shut
down the database with the tablespaces still in backup mode.
it just says "performance problems", nothing more than that.*
Any answers ? I am sure this question would have popped to some of you senior DBA people out there.

user13076519 wrote:
Where does oracle write if put the database in begin backup mode for LONG PERIODs. Lets say I issued a "ALTER DATABASE BEGIN BACKUP" command in a busy database and forgot about it for a long time. It writes just like it always does, plus it puts some extra in the redo log the [url http://oraclenz.com/2008/07/11/logging-or-nologging-that-is-the-question-part-ii/]first time a block is changed.
>
>
I understand that when the DB IS IN BEGIN BACKUP MODE, "the database copies whole changed data blocks into the redo stream." (Page 503 of 11.1 backup and recovery guide). But the redo stream is limited by the number of online redologs. After some time redologs also wont be sufficient for the changed data values after a begin backup is issued. I understand that there are archived redologs. This appears to be a typo (incompleteness, really) in the backup and recovery guide.
The redo stream is not limited by the number of of redo logs, only the volume of data. When a log fills up, it gets archived. If all the logs get filled up before the first one is finished archiving, the db will stall until the next redo becomes available. The only limit to archiving is disk space (and bandwidth if that is an issue, which it can be in some configurations).
>
Lets say there are 2 redolog groups in this database and Lets say 10 archive log files got generated since the ALTER DATABASE BEGIN BACKUP was issued.
When i finally issue the "ALTER DATABASE END BACKUP" command, will Oracle sync the datafiles with the changed data blocks reading the data from these 10 archived log files ? What happens if i delete these archive redologs from the archive log destination. ??Archived logs are archived, Oracle only reads them in recovery. You do not understand archive logs, read the concepts manual.
>
page 504 of 598 in the backup and recovery guide
Caution : If you fail to take the tablespace out of backup mode,
then Oracle Database continues to write copies of data blocks in
this tablespace to the online redo logs, causing performance
problems. Also, you receive an ORA-01149 error if you try to shut
down the database with the tablespaces still in backup mode.
it just says "performance problems", nothing more than that.*Because it is overgeneralizing.
>
Any answers ? I am sure this question would have popped to some of you senior DBA people out there.Oh, you want to send me a gift for showing where in oracle it's documented? See [url http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:271815712711]here for something over a decade old.

RMAN and Begin backup mode

Hi guys I have a couple of questiopns...
I want to know whether data is written to datafiles by DBWR when the datafile is in begin backup mode.
What is the difference in archive log creation during normal operation of a database and operation of a database during RMAN backup?

user13087302 wrote:
Normally, Oracle should write only changes into redolog files. But if tablespace is in backup mode, then entire block will be put into redolog as soon as this change it is 1st change occured on that block after enabling backup mode. That is why, we face massive redo log generation if the tablespace is in backup mode. So, logically you should be able to recover to the last SCN you have in hands.What do you mean by last SCN.Is it the SCN before puttting the tablespace in backup mode?Does that mean data present in other files will also be lost even though they are written in datafiles..Pls, look:
SQL> create tablespace myts1 datafile 'C:\app\oracle\oradata\testdb\myts1.dbf' size 10m;
Tablespace created.
SQL> create tablespace myts2 datafile 'C:\app\oracle\oradata\testdb\myts2.dbf' size 10m;
Tablespace created.
SQL> create table myt1 tablespace myts1 as select * from dba_objects where rownum<10001;
Table created.
SQL> create table myt2 tablespace myts2 as select * from dba_objects where rownum<10001;
Table created.
SQL> alter tablespace myts1 begin backup;
Tablespace altered.
SQL> create table myt1_1 tablespace myts1 as select * from dba_objects where rownum<10001;
Table created.
SQL> create table myt2_1 tablespace myts2 as select * from dba_objects where rownum<10001;
Table created.
SQL> create table myt1_3 tablespace myts1 as select * from dba_objects where rownum<10001;
Table created.Backup database:
C:\Documents and Settings\Administrator>rman target /
Recovery Manager: Release 11.2.0.1.0 - Production on Wed Nov 3 15:46:55 2010
Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved.
connected to target database: TESTDB (DBID=2517263760)
RMAN> backup database;
Starting backup at 03-NOV-10
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=44 device type=DISK
channel ORA_DISK_1: starting full datafile backup set
channel ORA_DISK_1: specifying datafile(s) in backup set
input datafile file number=00001 name=C:\APP\ORACLE\ORADATA\TESTDB\SYSTEM01.DBF
input datafile file number=00002 name=C:\APP\ORACLE\ORADATA\TESTDB\SYSAUX01.DBF
input datafile file number=00003 name=C:\APP\ORACLE\ORADATA\TESTDB\UNDOTBS01.DBF
input datafile file number=00005 name=C:\APP\ORACLE\ORADATA\TESTDB\EXAMPLE01.DBF
input datafile file number=00006 name=C:\APP\ORACLE\ORADATA\TESTDB\MYTS1.DBF
input datafile file number=00007 name=C:\APP\ORACLE\ORADATA\TESTDB\MYTS2.DBF
input datafile file number=00004 name=C:\APP\ORACLE\ORADATA\TESTDB\USERS01.DBF
channel ORA_DISK_1: starting piece 1 at 03-NOV-10
channel ORA_DISK_1: finished piece 1 at 03-NOV-10
piece handle=C:\APP\ORACLE\FLASH_RECOVERY_AREA\PRIM_DB\BACKUPSET\2010_11_03\O1_MF_NNNDF_TAG20101103T154701_6F2LXQ5C_.BKP tag=TAG20101103T154701 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:01:35
channel ORA_DISK_1: starting full datafile backup set
channel ORA_DISK_1: specifying datafile(s) in backup set
including current control file in backup set
including current SPFILE in backup set
channel ORA_DISK_1: starting piece 1 at 03-NOV-10
channel ORA_DISK_1: finished piece 1 at 03-NOV-10
piece handle=C:\APP\ORACLE\FLASH_RECOVERY_AREA\PRIM_DB\BACKUPSET\2010_11_03\O1_MF_NCSNF_TAG20101103T154701_6F2M0PJ3_.BKP tag=TAG20101103T154701 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:01
Finished backup at 03-NOV-10
Recovery Manager complete.
SQL> select current_scn from v$database;
CURRENT_SCN
    1466019
SQL> drop table myt1_3 purge;
Table dropped.So, we dropped table MYT1_3 and now trying incomplete recovery.
SQL> shutdown abort;
ORACLE instance shut down.
SQL> startup mount;
ORACLE instance started.
Total System Global Area 431038464 bytes
Fixed Size                  1375088 bytes
Variable Size             322962576 bytes
Database Buffers          100663296 bytes
Redo Buffers                6037504 bytes
Database mounted. C:\Documents and Settings\Administrator>rman target /
Recovery Manager: Release 11.2.0.1.0 - Production on Wed Nov 3 15:51:51 2010
Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved.
connected to target database: TESTDB (DBID=2517263760, not open)
RMAN> run
2> {
3> set until scn 1466019;
4> restore database;
5> recover database;
6> sql 'alter database open resetlogs';
7> }
executing command: SET until clause
Starting restore at 03-NOV-10
using target database control file instead of recovery catalog
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=20 device type=DISK
channel ORA_DISK_1: starting datafile backup set restore
channel ORA_DISK_1: specifying datafile(s) to restore from backup set
channel ORA_DISK_1: restoring datafile 00001 to C:\APP\ORACLE\ORADATA\TESTDB\SYS
TEM01.DBF
channel ORA_DISK_1: restoring datafile 00002 to C:\APP\ORACLE\ORADATA\TESTDB\SYSAUX01.DBF
channel ORA_DISK_1: restoring datafile 00003 to C:\APP\ORACLE\ORADATA\TESTDB\UNDOTBS01.DBF
channel ORA_DISK_1: restoring datafile 00004 to C:\APP\ORACLE\ORADATA\TESTDB\USERS01.DBF
channel ORA_DISK_1: restoring datafile 00005 to C:\APP\ORACLE\ORADATA\TESTDB\EXAMPLE01.DBF
channel ORA_DISK_1: restoring datafile 00006 to C:\APP\ORACLE\ORADATA\TESTDB\MYTS1.DBF
channel ORA_DISK_1: restoring datafile 00007 to C:\APP\ORACLE\ORADATA\TESTDB\MYTS2.DBF
channel ORA_DISK_1: reading from backup piece C:\APP\ORACLE\FLASH_RECOVERY_AREA\
PRIM_DB\BACKUPSET\2010_11_03\O1_MF_NNNDF_TAG20101103T154701_6F2LXQ5C_.BKP
channel ORA_DISK_1: piece handle=C:\APP\ORACLE\FLASH_RECOVERY_AREA\PRIM_DB\BACKUPSET\2010_11_03\O1_MF_NNNDF_TAG20101103T154701_6F2LXQ5C_.BKP tag=TAG20101103T154701
channel ORA_DISK_1: restored backup piece 1
channel ORA_DISK_1: restore complete, elapsed time: 00:01:45
Finished restore at 03-NOV-10
Starting recover at 03-NOV-10
using channel ORA_DISK_1
starting media recovery
media recovery complete, elapsed time: 00:00:03
Finished recover at 03-NOV-10
sql statement: alter database open resetlogs
RMAN>Now, check tables:
SQL> select count(*) from myt1;
COUNT(*)
     10000
SQL> select count(*) from myt2;
   COUNT(*)
     10000
SQL> select count(*) from myt1_3;
COUNT(*)
     10000
SQL> select count(*) from myt2_1;
COUNT(*)
     10000So, it does not matter what is the status of any tablespace: in backup mode or not. Incomplete recovery uses archivelogs + redologs.

How to backup only one tablespace in cold backup noarchivelog mode

Hi,
How to backup only one tablespace in cold backup noarchivelog mode
Reagrds,
Rushang

We have to restore all 50 GB database if we fail in scripts meanwhile to start again the data load.
Out scripts populater only two tablespaces.
That's why if i take backup of those tabblespace then i have to restore only those tablespace not whole database.
Regards,
Rushang

Tablespace or Datafile in Backup mode

Hi,
Can anyone explain me what happen at the background when a tablespace or a datafile is in backup mode.
Thanks in advance
Regards
Aruna
Edited by: user11144654 on May 8, 2009 3:10 AM

The tablespace is checkpointed, the checkpoint SCN marker in the datafile headers cease to increment with checkpoints, and full images of changed DB blocks are written to the redologs.
Those three actions are all that is required to guarantee consistency once the file is restored and recovery is applied. By freezing the checkpoint SCN in the file headers, any subsequent recovery on that backup copy of the file will know that it must commence at that SCN. Having an old SCN in the file header tells recovery that the file is an old one, and that it should look for the redolog file containing that SCN, and apply recovery starting there. Note that checkpoints to datafiles in hot backup mode are not suppressed during the backup, only the incrementing of the main checkpoint SCN flag. A “hot backup checkpoint” SCN marker in the file header continues to increment as periodic or incremental checkpoints progress normally.
There is a confusing side effect of having the checkpoint SCN artificially frozen at an SCN earlier than the true checkpointed SCN of the datafile. In the event of a system crash or a ‘shutdown abort’ during hot backup of a tablespace, the automatic crash recovery routine at startup will think that the files for that tablespace are quite out of date, and will actually suggest the application of old archived redologs in order to bring them back into sync with the rest of the database. It is unnecessary, in this case, to heed Oracle’s suggestion. With the database started up in mount mode, simply check v$backup and v$datafile to determine which datafiles were in backup mode at the time the database crashed. For each file in backup mode, issue an ‘alter database datafile '<file name>' end backup;’ This action will update the checkpoint SCN in the file headers to be the same as the hot backup checkpoint SCN (which is a true representation of the last SCN to which the datafile is truly checkpointed. Once this action is taken, it allows normal crash recovery to proceed during the ‘alter database open;’ command.
By initially checkpointing the datafiles that comprise the tablespace and logging full block images to redo, Oracle guarantees that any blocks changed in the datafile while in hot backup mode will also be available in the redologs in case they are ever used for a recovery.
It is well understood by much of the Oracle user community that during hot backup mode, a greater volume of redo is generated for changes to the tablespace being backed up than when the tablespace is not in backup mode. This is the result of the logging of full images of changed blocks in these tablespaces to the redologs. Normally, Oracle logs an entry in the redologs for every change in the database, but it does not log the whole image of the database block. By logging full images of changed DB blocks to the redologs during backup mode, Oracle eliminates the possibility of the backup containing irresolvable split blocks. To understand this reasoning, you must first understand what a split block is.
Typically, Oracle database blocks are a multiple of O/S blocks. For instance, most Unix filesystems have a default block size of 512 bytes, while Oracle’s default block size is 2k. This means that the filesystem stores data in 512 byte chunks, while Oracle performs reads and writes in 2k chunks, or multiples thereof. While backing up a datafile, your backup script makes a copy of the datafile from the filesystem, using O/S utilities such as copy, dd, cpio, or OCOPY. As it is making this copy, it is reading in O/S-block sized increments. If the database writer happens to be writing a DB block into the datafile at the same time that your script is reading that block’s constituent O/S blocks, your backup copy of the DB block could contain some O/S blocks from before the database performed the write, and some from after. This would be a split block.
By logging the full block image of the changed block to the redologs, it guarantees that in the event of a recovery, any split blocks that might be in the backup copy of the datafile will be resolved by overlaying them with the full legitimate image of the block from the redologs. Upon completion of a recovery, any blocks that got copied in a split state into the backup will have been resolved through application of full block images from the redologs.

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Tablespace begin backup mode,

Whether redo-logfiles get created during tablespace begin backup mode.? is that really possible?

a9362c69-5635-4bf2-a548-4a13a7cba11b wrote:
Whether redo-logfiles get created during tablespace begin backup mode.? is that really possible?
Database Concepts
Continuing to flood the forum with documentation questions -- especially after repeated warnings -- will continue to result in nothing more than links to the documentation you should be reading.

I have a 4th gen iPod touch that won't power up! I tried all the traditional stuff. I want to know how to tell if the battery is good. itunes see's the ipod in recovery mode. Tried dfu mode and did not work. Any ideas?

I have a 4th gen iPod touch that won't power up! I tried all the traditional stuff. I want to know how to tell if the battery is good. itunes see's the ipod in recovery mode. Tried dfu mode and did not work. Any ideas? I can hear the PC beep when plugging it in! I suspect a bad battery and trying to charge it ina wall charger made it hot!

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How to tell tablespace is in backup mode?

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