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.
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I put my macbook into target disk mode and now it won't start up in regular mode
I put my macbook into target disk mode and now it won't start up in OSX. I have used my install disk and repaired the drive. I have held down the option key to choose the system. I have tried to start in safe mode with same result. The apple screen appears, but the gear just keeps turning. I can get it back into target disk mode by connecting it by firewaire to my macbook pro. It will start up in Windows when I choose that system. What can I do to get it to start up with OSX?
Thanks for your help.Try this from MacFixIt as well:
In the case of drive directory damage or problems with permissions, the solution is usually to use Apple's Disk Utility to repair the disk. Of course, you won't be able to perform this operation normally (simply launching the Disk Utility application, located in Applications/Utilities, and initiating a disk repair) if your system will not startup. So two options exist:
* Insert your Mac OS X 10.4.x (Tiger) media (DVD or CD) and restart the computer while holding down the "C" key. Once the computer has booted from the installation disc, select "Utilities" from the menubar and open Disk Utility. Repair the disk, then quit Disk Utility and restart your system.
* Alternatively, you can repair the disk while booted in single user mode if you do not have access to a retail Mac OS X 10.4.x (Tiger) DVD/CD. To startup in single user mode, hold down the "Command" and "S" keys simultaneously at startup. Once properly booted, type the command fsck at the prompt. Repeat these process until no errors appear. -
Time Machine crashes whenever the computer goes to sleep or into screen saver mode.
Apologies if there is an obvious answer or post about this. Every time I try to initialize Time Machine, it will begin backing up until the computer goes to sleep or the screen saver kicks in. When I wake the computer up, I get a message that says "The backup was not performed because an error occurred while copying files to the backup disk." The message also tells me that the problem might be temporary and to try Disk Utility to repair the backup disk if the problem persists.
When I run Disk Utility, I am told that the volume cannot be repaired and that it needs to be reformatted. I reformat the disk, try to run Time Machine again, and get the same problem whenever the computer goes to sleep or into screen saver mode. Lather, rinse, repeat.
I managed to get an initial backup only if I turned off the screen saver and the sleep function. However, once I turned them back on, I ran into the same problem when Time Machine tried to update the backup.
I am running OS X v.10.6.8 on an iMac5,1. The backup is a Toshiba 1TB USB external HD. I saw this same problem posted in the Lion forum (and I cribbed the title of this post from there). Nobody has offered a solution yet, but it was a very recent post.
Thanks in advance.Oh yeah I forgot to say I use an ETHERNET connection.
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Performance effect during HOT backup mode
Dear Experts,
Oracle 10gR2, Windows Server 2003 ,I.4TB database size
Our backup team put database in hot backup mode (alter tablespace begin......).
Is it cause some performance issue in the database ?
Thanks & Regards
Sunil Kumarsunil kumar wrote:
Dear Aman,
As I told you I just joined and same thing I told to upper level, I need some definite proof so that I can prove my point because it always happens here: Database always put in hot backup mode and application here went very slow. I am a new DBA, so I need some some proof(what kind I don't know :)
Aman, hot backup with RMAN is more preferable as compare to alter tablespace begin backup...... command.
Why ?
and if so why we still using OS commands to take backup;
Thanks & Regards
Sunil Kumar
:)You have the answers to your other questions. As to "why we still using OS commands to take backup"? Well, um..... ;-) You'd have to ask you're organization that question. I can tell you there is no defensible reason to do so ..... ;-) -
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.
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GUIDE: How to put your iPhone into Recovery/DFU Mode
As most iPhone owners will be aware, you can reset your device by holding down both the home button and sleep/wake button together until the device reboots. This will cure the majority of crashes and issues.
However, there may also be occasions where the phone goes seriously wrong and may appear to be 'dead'. Not everybody is aware that there is a second method which can be used to bring a phone back to life when all else seems lost. Consider it a 'last resort' if you like!
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MarkMI5 wrote:
Last one I did asked me to log in with original apple ID after I'd restored the firmware.Weird? The only thing I can think of is that the staff who had the iPhones didn't use an Apple ID, but then they must have done as they would have needed to have downloaded a couple of apps for work! We'll call it an 'anomaly'.. -
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,
WarrenHi,
U can check from v$backup about the status of the tablespace which is under begin backup mode. -
Kindle App Store has an app names Child's Place. It lets you add only the apps you want your child to access and requires a passcode to exit it. That way your child cannot access any other content except what you have allowed in this particular app. Does anyone know if Apple App store has anything comparable? I know you can set up restrictions in settings but this is different.
ThanksSorry but no, that is not possible in iOS. Other than what is offered in the Restrictions, there is no way to lock apps in general unless the app itself has a password feature. You can in iOS 6 lock the iPad into a single app, but that's your only option.
It's a tradeoff; apps can't affect each other except in very restrictive ways in iOS which makes such features from third parties impossible, but it also renders getting malware infecting your iOS device extremely unlikely, something not the case with Android-based devices.
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I have searched everywhere for this answer. Kiosk mode/assigned access is excellent. But it appears that you can only use IE Modern (Metro) for assigned access and the problem with that is I have found no way to completely lock down IE Modern.
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IE connect
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Hi,
i have a doubt in hot backup concept. when we perform hot backup and put the tablespace in begin backup mode the headers are freezed and all the entries for the headers are stored in redlogs. My doubt is if the redolog is archieved will the database applies the entries from archived log on the headers after end backup mode of tablespace???
Regards,
007Hi,
i have a doubt in hot backup concept. when we perform hot backup and put the tablespace in begin backup mode the headers are freezed and all the entries for the headers are stored in redlogs. My doubt is if the redolog is archieved will the database applies the entries from archived log on the headers after end backup mode of tablespace??? Putting a tablespace INTO hot backup mode does indeed cause a checkpoint to take place for that tablespace. But when the tablespace is out of hot backup mode does NOT. The SCNs in the headers of that tablespace will re-synchronize next time there is a system-wide checkpoint, but not until then.
Refer to thread : User managed hot backup
where HJR provided the demo.
- Pavan Kumar N
Edited by: Pavan Kumar on Jul 6, 2011 12:48 AM -
Hot backup getting delayed everyday
Hi All,
Everyday our hot backup job is getting delayed by a significant time. Before the tablespaces are placed into begin backup mode we spotted the alert log flooded with the below message ,
Mon May 21 00:23:46 2012
Incremental checkpoint up to RBA [0x396b.3365.0], current log tail at RBA [0x396
b.3386.0]
Mon May 21 00:54:03 2012
Incremental checkpoint up to RBA [0x396b.3b81.0], current log tail at RBA [0x396
b.3b98.0]
Mon May 21 01:24:21 2012
Incremental checkpoint up to RBA [0x396b.495a.0], current log tail at RBA [0x396
b.497a.0]
Mon May 21 01:54:47 2012
Incremental checkpoint up to RBA [0x396b.5109.0], current log tail at RBA [0x396
b.5137.0]
Mon May 21 02:25:13 2012
Incremental checkpoint up to RBA [0x396b.6771.0], current log tail at RBA [0x396
b.67b6.0]
Also after the tablespaces are placed into begin backup mode before the end backup occurs the altert log is also flooded with the below messages,
Incremental checkpoint up to RBA [0x396b.24107.0], current log tail at RBA [0x39
6b.24afe.0]
Mon May 21 05:58:39 2012
Incremental checkpoint up to RBA [0x396b.2569e.0], current log tail at RBA [0x39
6b.257f2.0]
Mon May 21 06:28:56 2012
Incremental checkpoint up to RBA [0x396b.2815a.0], current log tail at RBA [0x39
6b.28925.0]
Mon May 21 06:59:14 2012
Incremental checkpoint up to .
Then the tablespaces are placed into end backup mode resulting in significant delay.
Please help how we can reduce the backup time and also please throw some light on these checkpoint related messages.Hi Jonathon ,
Thanks for your valuable suggestion.
Here in our environment all the tablespaces go into hot backup mode at a time instead of one by one through a script.
Previously when the hot backup used to work fine the number of incremental checkpoints between begin backup and end backup were significantly less. It is also evident from the excerpt of the alert log file.
alter tablespace PROAIMIS01 begin backup
Completed: alter tablespace PROAIMIS01 begin backup
Mon Apr 19 01:02:47 2010
alter tablespace SYSTEM begin backup
Completed: alter tablespace SYSTEM begin backup
Mon Apr 19 01:02:47 2010
alter tablespace MAPDS01 begin backup
Completed: alter tablespace MAPDS01 begin backup
Mon Apr 19 01:02:47 2010
alter tablespace ADMN01 begin backup
Completed: alter tablespace ADMN01 begin backup
Mon Apr 19 01:02:47 2010
alter tablespace PACESIS01 begin backup
Completed: alter tablespace PACESIS01 begin backup
Mon Apr 19 01:02:47 2010
alter tablespace CTPDS01 begin backup
Completed: alter tablespace CTPDS01 begin backup
Mon Apr 19 01:07:47 2010
***Completed checkpoint up to RBA [0x1ced.2.10], SCN: 10912956469916***
***Mon Apr 19 01:14:13 2010***
***Incremental checkpoint up to RBA [0x1ced.fd.0], current log tail at RBA [0x1ced.***
***10a.0]***
***Mon Apr 19 01:44:32 2010***
***Incremental checkpoint up to RBA [0x1ced.73f.0], current log tail at RBA [0x1ced***
***.89e.0]***Mon Apr 19 01:51:58 2010*alter tablespace CTPIS01 end backup*Mon Apr 19 01:51:58 2010
Completed: alter tablespace CTPIS01 end backup
Mon Apr 19 01:51:58 2010
alter tablespace MAPDS01 end backup
Completed: alter tablespace MAPDS01 end backup
Mon Apr 19 01:51:58 2010
alter tablespace SYSAUX end backup
Completed: alter tablespace SYSAUX end backup
Mon Apr 19 01:51:58 2010
alter tablespace AUDT01 end backup
Completed: alter tablespace AUDT01 end backup
Mon Apr 19 01:51:59 2010
alter tablespace PROAIMIS01 end backup
Completed: alter tablespace PROAIMIS01 end backup
Mon Apr 19 01:51:59 2010
alter tablespace MAPIS01 end backup
Completed: alter tablespace MAPIS01 end backup
Mon Apr 19 01:51:59 2010
alter tablespace UNDO01 end backup
Completed: alter tablespace UNDO01 end backup
Mon Apr 19 01:51:59 2010
alter tablespace USER01 end backup
Completed: alter tablespace USER01 end backup
Mon Apr 19 01:51:59 2010
alter tablespace PROAIMDS01 end backup
Completed: alter tablespace PROAIMDS01 end backup
Mon Apr 19 01:51:59 2010
alter tablespace PACESIS01 end backup
Completed: alter tablespace PACESIS01 end backup
Mon Apr 19 01:52:00 2010
alter tablespace XDB01 end backup
Completed: alter tablespace XDB01 end backup
Mon Apr 19 01:52:00 2010
alter tablespace ADMN01 end backup
Completed: alter tablespace ADMN01 end backup
Mon Apr 19 01:52:00 2010
alter tablespace SYMANTEC_I3_ORCL end backup
Completed: alter tablespace SYMANTEC_I3_ORCL end backup
Mon Apr 19 01:52:00 2010
alter tablespace CTPDM01 end backup
Completed: alter tablespace CTPDM01 end backup
Mon Apr 19 01:52:00 2010
alter tablespace PACESDS01 end backup
Completed: alter tablespace PACESDS01 end backup
Mon Apr 19 01:52:00 2010
alter tablespace SYSTEM end backup
Completed: alter tablespace SYSTEM end backup
Mon Apr 19 01:52:01 2010
alter tablespace CTPDS01 end backup
Completed: alter tablespace CTPDS01 end backup
Mon Apr 19 01:52:01 2010
alter tablespace PERF01 end backup
Completed: alter tablespace PERF01 end backup
Mon Apr 19 01:52:01 2010
alter database backup controlfile to trace
Completed: alter database backup controlfile to trace
Mon Apr 19 01:52:01 2010
alter database backup controlfile to '$CTLBKPDIR/$ORACLE_SID-$dt-$tm.ctl'
Completed: alter database backup controlfile to '$CTLBKPDIR/$ORACLE_SID-$dt-$tm.
ctl'
Mon Apr 19 01:52:03 2010
Beginning log switch checkpoint up to RBA [0x1cee.2.10], SCN: 10912957698129
Thread 1 advanced to log sequence 7406
Completed: alter tablespace PACESDS01 end backup
Mon Apr 19 01:52:00 2010
alter tablespace SYSTEM end backup
Completed: alter tablespace SYSTEM end backup
Mon Apr 19 01:52:01 2010
alter tablespace CTPDS01 end backup
Completed: alter tablespace CTPDS01 end backup
Mon Apr 19 01:52:01 2010
alter tablespace PERF01 end backup
Completed: alter tablespace PERF01 end backup
Mon Apr 19 01:52:01 2010
alter database backup controlfile to trace
Completed: alter database backup controlfile to trace
alter tablespace ADMN01 end backup
Completed: alter tablespace ADMN01 end backup
Completed: alter tablespace CTPDS01 begin backup
Mon Apr 19 01:07:47 2010
Completed checkpoint up to RBA [0x1ced.2.10], SCN: 10912956469916
Mon Apr 19 01:14:13 2010
Incremental checkpoint up to RBA [0x1ced.fd.0], current log tail at RBA [0x1ced.
10a.0]
Mon Apr 19 01:44:32 2010
Incremental checkpoint up to RBA [0x1ced.73f.0], current log tail at RBA [0x1ced
.89e.0]
Mon Apr 19 01:51:58 2010
alter tablespace CTPIS01 end backup
Mon Apr 19 01:51:58 2010
Completed: alter tablespace CTPIS01 end backup
Mon Apr 19 01:51:58 2010
alter tablespace MAPDS01 end backup
Completed: alter tablespace MAPDS01 end backup
Mon Apr 19 01:51:58 2010
alter tablespace SYSAUX end backup
Completed: alter tablespace SYSAUX end backup
Mon Apr 19 01:51:58 2010
alter tablespace AUDT01 end backup
Completed: alter tablespace AUDT01 end backup
Mon Apr 19 01:51:59 2010
alter tablespace PROAIMIS01 end backup
Completed: alter tablespace PROAIMIS01 end backup
Mon Apr 19 01:51:59 2010
alter tablespace MAPIS01 end backup
Completed: alter tablespace MAPIS01 end backup
Mon Apr 19 01:51:59 2010
alter tablespace UNDO01 end backup
Completed: alter tablespace UNDO01 end backup
Mon Apr 19 01:51:59 2010
alter tablespace USER01 end backup
Completed: alter tablespace USER01 end backup
Mon Apr 19 01:51:59 2010
alter tablespace PROAIMDS01 end backup
Completed: alter tablespace PROAIMDS01 end backup
Mon Apr 19 01:51:59 2010
alter tablespace PACESIS01 end backup
Completed: alter tablespace PACESIS01 end backup
Mon Apr 19 01:52:00 2010
alter tablespace XDB01 end backup
Completed: alter tablespace XDB01 end backup
Mon Apr 19 01:52:00 2010
alter tablespace ADMN01 end backup
Completed: alter tablespace ADMN01 end backup
Mon Apr 19 01:52:00 2010
alter tablespace SYMANTEC_I3_ORCL end backup
Completed: alter tablespace SYMANTEC_I3_ORCL end backup
Mon Apr 19 01:52:00 2010
alter tablespace CTPDM01 end backup
Completed: alter tablespace CTPDM01 end backup
Mon Apr 19 01:52:00 2010
alter tablespace PACESDS01 end backup
Completed: alter tablespace PACESDS01 end backup
Mon Apr 19 01:52:00 2010
alter tablespace SYSTEM end backup
Completed: alter tablespace SYSTEM end backup
Mon Apr 19 01:52:01 2010
alter tablespace CTPDS01 end backup
Completed: alter tablespace CTPDS01 end backup
Mon Apr 19 01:52:01 2010
alter tablespace PERF01 end backup
Completed: alter tablespace PERF01 end backup
But for the last couple of days the number of incremental checkpoints seem to be higher between begin backup and end backup like below,
Incremental checkpoint up to RBA [0x396d.3129.0], current log tail at RBA [0x396
d.366c.0]
Tue May 22 03:14:23 2012
Incremental checkpoint up to RBA [0x396d.147a8.0], current log tail at RBA [0x39
6d.15ac8.0]
Tue May 22 03:44:45 2012
Incremental checkpoint up to RBA [0x396d.1c679.0], current log tail at RBA [0x39
6d.1d177.0]
Tue May 22 04:15:08 2012
Incremental checkpoint up to RBA [0x396d.20387.0], current log tail at RBA [0x39
6d.205dd.0]
Tue May 22 04:45:30 2012
Incremental checkpoint up to RBA [0x396d.20dcf.0], current log tail at RBA [0x39
6d.2109e.0]
Tue May 22 05:15:48 2012
Incremental checkpoint up to RBA [0x396d.23af5.0], current log tail at RBA [0x39
6d.23d6a.0]
Tue May 22 05:46:05 2012
Incremental checkpoint up to RBA [0x396d.245e3.0], current log tail at RBA [0x39
6d.245ef.0]
Tue May 22 05:47:08 2012
Also the parameter log_checkpoint_interval is set to zero here.
log_checkpoint_interval integer 0
And the parameter fast_start_mttr_target is set to 300
fast_start_mttr_target integer 300
Please suggest .. -
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
NaveenAre 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. -
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Error 1 is a very bad Hardware Error of the Baseband Chip. There is no fix. If you have Warranty or AppleCare Coverage, make Genius Reservation and take iPhone to Apple for resolution.
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Where is the official Oracle documentation that describes Hot Backup?
I have used the woefully inadequate Metalink search utilities and Google but the nearest thing I have found is a description on "Ask Tom".
I am looking for the official Oracle documentation that describes what happens internally during a Hot Backup. There are a lot of web sites and blogs out there that describe it but I am looking for the description from Oracle themselves. The only things I have found in the Oracle documentation so far is how to start and stop Hot Backup but not what happens internally. Preferably 11gR2 if it makes any difference.
Thanks in advance.Thanks mseberg. This is what I was looking for. I had read this manual before but apparently glossed over this paragraph:
"When performing a user-managed online backup, you must place your datafiles into
backup mode with the ALTER DATABASE or ALTER TABLESPACE statement with the
BEGIN BACKUP clause. When a tablespace is in backup mode, the database writes the
before image for an entire block to the redo stream before modifying a block. The
database also records changes to the block in the online redo log. Backup mode also
freezes the data file checkpoint until the file is removed from backup mode. Oracle
Database performs this safeguard because it cannot guarantee that a third-party
backup tool copies the file header before copying the data blocks."
Hot backup is still quite useful and Rman doesn't cover all cases. What we are doing with it is using storage-based replication (Shadow Image) to another set of LUNS which we then mount on another server and backup using Rman. This removes the overhead of Rman on the Production Database server and extends our backup window to almost 24 hours. -
How to take a Hot backup of Oracle database
1: put the db in archive log mode
2: set the db_sid to correct one
3: login to sqlplus
4: verify the name of the db that you are connected to
select name from v$database;
5: check if the db is in archive log made
select log_mode from v$database;
if not in archive log mode
another command to check
archive log list;
6: find where on disk oracle writes archive log when it is in archive log mode
sql> show parameter log_archive_dest_1;
if the value is found to be 0, that means no values will be recorded, so we need to change it
sql> alter system set log_archive_dest_1='LOCATION=c:\database\oradata\finance\archived_logs\'
scope=spfile;
7: shutdown immediate; < this is done just to prepare the db for hot backups >
8: startup the db in mount mode
startup mount;
( 3 startup types : nomount - just starts the instance, mount - locates the control files and open up according to the values, open - finds the datafiles from the control files and opens up the db )
9: put the db in archive log mode
alter database archivelog;
10: open the database
alter database open;
11: check the status of the db
select log_mode from v$database;
SQL> archive log list;
12: create a directory for archived log
check if its empty, if empty we need to switch
sql> alter system archive log current;
run it 5 times < need to put / and enter > , then check the archive log dir , we will find files
13: make a table in the database and insert data in it
create table employees (fname varchar(2));
check the table
desc employees;
insert values
insert into employees values ('Mica');
14: tablespace must be in hot backup mode
check the status
select * from v$backup;
if found not active, then we need to change
we cannot put the db in hot backup mode, unless it is archive log mode
change to hot backup mode
alter database begin backup;
check the status
select * from v$backup;
15: now we can only COPY DBF FILES
copy *dbf <distination location>
16: need to take the db out to hot backup mode
alter database end backup;
17: need to make another archive log switch
alter system archive log current;
18: need to copy control files now, need to do a binary bckup
alter database backup controlfile to '<location>\controlbackup';
19: insert more values to the table
insert into employess values ('NASH')
COMMIT;
make another archive log switch : alter system archive log current;
do the same process for more values
20 : backup all the archive logs to a new location
21: shutdown the db and simulate a hw error, delete all the files from the database folder
22: try to start the sqlplus and db ::: error
23: copy all the backups to the db dir
need to copy the control files, rename the binary backup of the control file and make the copies as needed
24: try to mount the db, error < must use reset logs or noreset logs >
25: need to do a recovering of the database
shutdown
restore the archive logs
startup mount;
recover database until cancel using backup controlfile;
it will ask for a log file :
yes for recovery
cancel for cancelling recovery
26: check status: open the database in readonly
alter database open read only;
check the tables to see the data
shutdown immediate
shartup mount;
recover again : recover database until cancel using backup controlfile;
if oracle is asking for a log that do nto exist , all we have to do is type cancel
27: open the database
alter database open;
need to do reset logs
alter database open resetlogs;
28: check the db that you are connected, check the tables
thanks and regards
VKN
site admin
http://www.nitrofuture.comA very long list ... let me make it shorter.
SQL> archive log list;If I see this:
Database log mode No Archive ModeI put the database into archivelog mode and leave it there forever.
If it is in archivelog mode:
RMAN> TARGET SYS/<password>@<service_name> NOCATALOG
RMAN> BACKUP DATABASE PLUS ARCHIVELOG;Though there are a lot of things one could do better such as incrementals with block change tracking, creating an RMAN catalog, etc.
Maybe you are looking for
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