Smaller databases HOT backups

Similar Questions

• A development database hot backup

  RDBMS version: 10.2.0.4
  Operating system: Solaris 5.10
  
  One of our development database is in NOARCHIVELOG mode, and we want to keep it this way. Every Sunday, we want to make a complete this DB RMAN backup. Since developers (WE, India, China) could be working from home on Sunday and need to connect to the DB, we cannot stop this DB. I think to create a hot RMAN backup script that will be

  1. Place the DB in ARCHIVELOG mode temporarily
  2. Startup (OPEN) the DB and Take a FULL BACKUP including the archive logs with a script
   run {
   allocate channel m1 TYPE DISK connect 'sys/fls'  FORMAT   '/u05/rbkp/ptcp_%U.rmb';
   backup as compressed backupset database tag 'full'  plus archivelog; 
  }
  
  3. After the Hot backup is done, the shell script should place the DB in MOUNT stage and revert back to NOARCHIVELOG mode   and startup

  The RMAN full backup taken using the strategy above held for restoration and recovery?
  
  I can't put the commands for the placement of the DB in ARCHIVELOG mode in the RMAN run block. I can?

  You have a valid backup, but you will not be able to perform a FULL restore. You said that you will return noarchivelog mode after the backup. When your database requires recovery of the media in this mode, you will have more often a gap between the last saved archivelog and real online newspaper. If you can only make one point incomplete recovery - until the last archivelog available in the backupset.

  Werner

• hot backup managed user problem

  Jin
  
  A few days ago, I took the managed user my database hot backup. And then, to check if the data file are in correct mode, I ran the query:
  
  SQL > select * sauvegardΘ v$.
  
  FOLDER # STATUS CHANGES # TIMES
  ---------- ------------------ ---------- ---------
  1. NO ASSETS 6302304272 23 JANUARY 10
  2. NO ASSETS 6302305573 23 JANUARY 10
  3. NO ASSETS 6302304259 23 JANUARY 10
  4. NO ASSETS 6302305573 23 JANUARY 10
  5. NO ASSETS 6302305573 23 JANUARY 10
  6 0 NO ASSETS
  7 0 NO ASSETS
  
  
  
  And, I didn't know that all data files have completed end backup mode. But today, when I query v$ datafile_header to check the column fuzzy then I was shocked to see the result below:
  
  SQL > select fuzzy from v$ datafile_header;
  
  FUZ
  ---
  YES
  YES
  YES
  YES
  YES
  YES
  YES
  
  7 selected lines.
  
  I use oracle 9.2.0.8 on windows server 2003.
  
  
  Although the view of backup $ v shows the same 'NOT ACTIVE' because all data files.this make me very confused.
  
  
  Please give me some feedback...
  
  Kind regards

  V$ BACKUP and V$ DATAFILE_HEADER are two different views. Why confuse yourself? They are there to meet different requirements.

  V$ BACKUP is used to check if a data file is in backup mode.

  V$ DATAFILE_HEADER is used to check the header of a data file. Of course a datafile is BLURRED when the database is OPENED - independently of the question whether an online backup is running or has run earlier.

  Hemant K Collette
  http://hemantoracledba.blogspot.com

• Is make Journal required for backup of database hot and cold water?

  Hi Experts,

  Please explain--again it takes to backup of database hot and cold water?

  Thank you

  Did you backup managed user or RMAN backup. In RMAN backup, you only need logs archived. But in the cold backup managed user, you don't need the redolog also if the PB was properly arrested. Jut copy the DBF and controlfile and put it there to the target server and during the recovery of redolog files will be created automatically.

  Please note that the database must be correctly stopped before cold backup is taken.

• UNDOTABLESPACE and TABLESPACE TEMP in cold or hot backup database

  Hello
  
  I have a BACKUP, including logs generated after the backup archive. What is the use of the UNDOTABLESPACE and TABLESPACE TEMP datafile data file backup? When it is used?
  
  
  Kind regards
  
  007

  >
  I have the archives which have all entries are committed in it. Undoinformation is necessary for the restoration and recovery of the database? Can u explain more clearly?
  >

  The archives are as congested entries of redo logs. And the redo logs contain all changes to the database. Information cancellation will be there in the segments of cancellation that there can be some uncommitted transactions active in the segments of cancellation. Cancellation information is necessary to put the database in a consistent state. It is one of very important storage similar to the control file and system tablespace to bring a database

  Edited: Imagine a scenario. You make a backup hot at 07:00. And there are a lot of transactions happening before and during hot backup. For ex, I run a massive update to a table. This will cause the recovery to write logs of recovery that will be eventually written to logs archived. Now, you finish the backup mode. But I have not validated or cancelled my transaction. Say to the reasoning, I roll back the transaction.

  Now, you restore the backup. Do you think that my transaction will be in inconsistent state? Redo logs and archiveed newspapers had my transaction changes/redo entries. If you are not using undo in recovery segments, what will happen to my operation that I rolled back? Without cancel, half of my transaction (even if they were not truly committed) will be sitting in the database. This is where undo tablespace helps us in rolling back the transaction during your recovery. Remember, the cancellation information "peuvent" not all in recovery if you do not a complete database recovery. But Oracle should know that. If you need to undo tablespace in your backup set.

  I hope it's clear now

  Published by: VenkatB on Sep 15, 2011 10:17

• stop the database when the HOT backup running

  Hello
  
  Can someone pls tell... WHT can impact on the database if the database will get stop accidentally during the hot running backup...
  
  Thank you

  There will be no impact on db; because its ORACLE database; very smart and easy to use.

  What happens if the instance goes down for the tablespaces into backup mode?

  When you start the database after that, Oracle will say that it requires recovery. It's because the RCS has been frozen and this is the expected behavior, because if you restore the file copied, it needs to be recovered. (and the only way that oracle has to set its value in the copy is put in the current file while it is copied)

  In this case, you can issue:

  ALTER DATABASE END BACKUP; ALTER DATABASE OPEN; to open the database.

  But your backup is not usable, it must do it again.

  Source: http://knol.google.com/k/oracle-begin-backup-end-backup#

  HTH
  Girish Sharma

• HOT backup database 10g express edition

  Dear Sir
  I use oracle database 10g express edition with 3.2.1 apex.
  
  I'm planing to db.here hot backup entire database is 24 x 7 running... fashion archive
  Info
  
  pFile, control, password file
  System datafile
  SYSAUX datafile
  Undo tablespace file
  temporary tablespace file
  redo log files
  application data tablespace file
  application index tablespace file
  
  for backup of the entire database HOT including apex WORKSPACE... which tablespace or files are REQUIRED for backup?
  
  Thank you
  Engr.M.K Chowdhury

  Hello

  To be convinced, you can do the following:

  alter database begin backup;
  

  Then, you check the backup status of your datafilles with the following query:

  select file#, status
  from v$backup
  order by file#;
  

  If the status is ACTIVE, this means that the data files are in backup mode, and you can copy them.

  The redologs online, you can save them but this is not mandatory, because you have logs archived.

  It is important to get all archived logs generated during (and after) the backup.

  To do this, you can run the following right after the hot data files backup:

  alter system archive log current;
  

  It will generate a log archived that you need to include in your backup.

  If you lose all your data (including the redologs online), after you restore the data files, you need to retrieve
  the database. During this operation, you apply all archived logs and then you reset the redologs. It is a
  incomplete recovery.

  However, for the online redo logs, it is important to multiplex to another disk. So, if you lose members on
  a single disk, you can perform a full restore with their copy on the second disc.

  Hope this helps.
  Best regards
  Jean Valentine

• More redo generation during hot backup

  Hi all
  I want to know more over the generation of redo during hot backup.
  I know that in this case the data file headers are frozen. But I want to know how the whole thing goes. All did this experiment practically?
  Did any problems of performance because of this?
  
  
  
  Thank you
  Rafi.

  Hmm well, it basically means like this, assuming you have a block filled with 1s like that,

  ----
  1
  ----
  1
  ----
  1
  ----
  

  And this is the copy of the block that was sent to the backup by you and was taken over by the command cp o/s. While the cp command will make a backup of the block as it can be read much more small piece that, suppose that he would start with the 1st part of the block and starts copying to the o/s somewhere. At the same time feel, DBWR peaks upwards again and written on block 2, like that.

  ----
  1
  ----
  2
  ----
  1
  ----
  

  It can from the flie is always online and is available to be used by the database. Now, you have a problem. The image you sent for backup isn't th that is here now. Next time what cp command would return, he would find 2 instead of one in the 2nd part of blok and copy it since it is a mute command when comes to oracle. So now that you have in what you wanted in the backup and the backup are not the same images. You have a cracked now block which is of no use for the recovery. To this end, in the case of the hot backup, the first image of the block time is copied and is maintained. This saves us from the State to have 2 there. We have all the 1s who sent us. Now, if in the case, dbwr also changes the block, the original help oracle reover the block properly.

  HTH
  Aman...

• The hot backup process

  Hello
  
  I have a Dev on Oracle 10 g (10.2.0.3 on Solaris 8) db, for which I want to set up a simple backup process hot. My question is: for simplicity, instead of putting each tablespace in backup mode and to take it out of backup mode, can I put the entire db in backup mode and copy the data files and control and take the Pb of backup mode:
  
  -J' my intention to do so hours offline when activities are lower and db is small and there is enough space to make it so again is generated (compared to each tablespace in backup mode) that this is acceptable. Thus, the following process is valid:
  
  (1) connecting to the db as sys
  (2) alter database begin backup
  (3) copy all of the files and control the db for the backup
  (4) change the backup of the end
  - or after it is necessary to issue the - modify the statement of system switch logfile also? -If so, what is the purpose of this statement?
  
  Also another question is: I don't have enough space on the db server hosting backups so after you put the db in backup mode, I transfer the file in Microsoft windows server for solaris. -Is possible with rman?
  The reason why I go to managed user backup, of rman is that we do not store the backup on the db Server nor we have any tape, but we have a windows machine that can be used to store backups. so in this case, is it possible that rman can be used?
  
  Thank you very much
  Cedric

  When you use RMAN, you don't have to put a tablespace (or database) in BACKUP Mode.

  With RMAN, you can create of BACKUPSETs, in this case, backups can be smaller than the actual database files as RMAN does not save the blocks that have never been used (that is to say, the blocks above the last measure in a data file). In addition, you can create AS COMPRESS in order to introduce more compression.
  Alternatively, you can creat backup as Copy, in which case backups are the same size as the data files that you might have with scripted backups (UserManaged).

  You MUST run your database in ArchiveLog mode.
  You MUST save each ArchiveLog.
  You must save your controlfiles as backup controlfile separate. However, even if you do not configure CONTROLFILE AUTOBACKUP ON, whenever you back up the SYSTEM Tablespace (that I advice every day), the controlfile is going to get backed up in the same backup set. For added convenience, I prefer controlfiles backup as separate backups so that they save files are easily identifiable.

• Closed APB hot backup

  Hello

  Could someone please help me to clarify the following:

  

  The above is the new guide features 12 c University student.

  Is not "alter database begin backup" called "backup of user management?

  "Hot backup" AFAIK means online of RMAN backup and requires that the database is in log mode archive.

  Also the instructer said "If the PDB is closed, you take a hot backup, that APB is not save, because the files are not in line.» "If the file is not open to the database, RMAN cannot hot backup.

  I just test rman backup in 12.1.0.1 when the PIC is opened and it included also all the PDB, including those that have been closed and in mounted condition. So what is the correct history?

  Thank you!

  Unfortunately, I can ask is no longer the instructor, but I noticed yesterday that I have actually ask your instructor about the same question a year ago. The answer was however really does not correspond to the question. In any case I guess it was just some confusion about the context.

  From what I understand, there are two ways to make a hot backup. One is called "user managed backup" by putting the database in backup mode by using the "alter database begin backup" statement and the other is to use RMAN. Two hot backupl methods require that the database is in log mode archive, but RMAN, by default, unlike "user managed backup" includes storage in offline mode.

  This means while a database is hot backup mode using "user managed backup", cannot close a PDB file and doing so will trigger an error ORA-01149. RMAN however has no such restrictions and will automatically include the backup of the PDB closed.

  I hope that my conclusion is correct and I am considering this thread supposed replied.

• Hot backup cloning

  Hi all

  I have HOT backu cloning. After taking backup 100000 transaction in the source database.

  I can't open the database cloning.

  SQL > startup pfile='/u01/app/oracle/product/10.2.0/db_1/dbs/inithotdb.ora' nomount;

  ORACLE instance started.

  Total System Global Area 884998144 bytes

  Bytes of size 1222432 fixed

  226494688 variable size bytes

  654311424 of database buffers bytes

  Redo buffers 2969600 bytes

  SQL > @/ home/sham/conttrol.sql.

  Created control file.

  SQL > alter database open resetlogs until cancel;

  ALTER database open resetlogs until cancel

  *

  ERROR on line 1:

  ORA-02288: invalid OPEN mode

  > > Option 2:

  SQL > restore database using backup controlfile until cancel;

  ORA-00279: change 481440 September at 14/04/2014 10:09:15 necessary to screw 1

  ORA-00289: suggestion:

  /U01/app/Oracle/product/10.2.0/Db_1/flash_recovery_area/HOTDB/ARCHIVELOG/2014_04_14/o1_mf_1_2_%U_.arc

  ORA-00280: change 481440 thread 1 is in sequence #2

  Specify the log: {< RET > = suggested |} Filename | AUTO | CANCEL}

  Cancel

  ORA-01547: WARNING: RECOVER succeeded but OPEN RESETLOGS would get below error

  ORA-01195: online backup of file 1 needs a recovery more match

  ORA-01110: data file 1:

  ' / u01/app/oracle/product/10.2.0/db_1/oradata/hotdb/system01.dbf'

  ORA-01112: media recovery not started

  I generated archives

  SQL > select name from v$ archived_log where first_change # > = & change_no;

  Enter the value of change_no: 481399

  old 1: select name from v$ archived_log where first_change # > = & change_no

  new 1: select name from v$ archived_log where first_change # > = 481399

  NAME

  --------------------------------------------------------------------------------

  /U01/app/Oracle/product/10.2.0/Db_1/flash_recovery_area/db3/ARCHIVELOG/2014_04_1

  4/o1_mf_1_3_9nptbnb5_.arc

  /U01/app/Oracle/product/10.2.0/Db_1/flash_recovery_area/db3/ARCHIVELOG/2014_04_1

  4/o1_mf_1_4_9npvc3jb_.arc

  /U01/app/Oracle/product/10.2.0/Db_1/flash_recovery_area/db3/ARCHIVELOG/2014_04_1

  4/o1_mf_1_5_9npvc4of_.arc

  /U01/app/Oracle/product/10.2.0/Db_1/flash_recovery_area/db3/ARCHIVELOG/2014_04_1

  4/o1_mf_1_6_9npvcbr3_.arc

  NAME

  --------------------------------------------------------------------------------

  /U01/app/Oracle/product/10.2.0/Db_1/flash_recovery_area/db3/ARCHIVELOG/2014_04_1

  4/o1_mf_1_7_9npvcdmw_.arc

  /U01/app/Oracle/product/10.2.0/Db_1/flash_recovery_area/db3/ARCHIVELOG/2014_04_1

  4/o1_mf_1_8_9npvcfpq_.arc

  /U01/app/Oracle/product/10.2.0/Db_1/flash_recovery_area/db3/ARCHIVELOG/2014_04_1

  4/o1_mf_1_9_9npvcmp7_.arc

  /U01/app/Oracle/product/10.2.0/Db_1/flash_recovery_area/db3/ARCHIVELOG/2014_04_1

  NAME

  --------------------------------------------------------------------------------

  4/o1_mf_1_10_9npvcoy8_.arc

  /U01/app/Oracle/product/10.2.0/Db_1/flash_recovery_area/db3/ARCHIVELOG/2014_04_1

  4/o1_mf_1_11_9npvcqcs_.arc

  /U01/app/Oracle/product/10.2.0/Db_1/flash_recovery_area/db3/ARCHIVELOG/2014_04_1

  4/o1_mf_1_12_9npvcx6j_.arc

  /U01/app/Oracle/product/10.2.0/Db_1/flash_recovery_area/db3/ARCHIVELOG/2014_04_1

  4/o1_mf_1_13_9npvd26l_.arc

  NAME

  --------------------------------------------------------------------------------

  /U01/app/Oracle/product/10.2.0/Db_1/flash_recovery_area/db3/ARCHIVELOG/2014_04_1

  4/o1_mf_1_14_9npvdcfc_.arc

  /U01/app/Oracle/product/10.2.0/Db_1/flash_recovery_area/db3/ARCHIVELOG/2014_04_1

  4/o1_mf_1_15_9npvdkr6_.arc

  /U01/app/Oracle/product/10.2.0/Db_1/flash_recovery_area/db3/ARCHIVELOG/2014_04_1

  4/o1_mf_1_16_9npvdmkn_.arc

  This:

  >/u01/app/oracle/flash_recovery_area/ORCL/archivelog/2014_04_15/o1_mf_1_13_%u_.arc

  would be entered as

  > /u01/app/oracle/flash_recovery_area/ORCL/archivelog/2014_04_15/o1_mf_1_13_9nsh7x1g_.arc

  Should be pretty obvious.  Oracle not knows not the exact file name, %u is a placeholder. You KNOW the exact name of the file.

  Hemant K Collette

• HOT backup done but the archive deleted after the end, so need to backup from backup

  Hello team,
  
  I did the sequence up to CLONE HOT: -.
  
  ALTER database begin backup; and golbal change #= 12564
  
  alter database end backup; and sequence # 12675 = Street
  
  Now the problem is that my archives are deleted between 12564 and 12675, street
  
  
  I want to take backup for production sequences, how do I do?

  920092 wrote:
  I'm not"allow corruption" and force resetlogs. and export all data damage shortly after?

  That would be foolish.

  Published by: JohnWatson on November 24, 2012 15:14
  Sorry, I'll try to be constructive. Ever, you can restore and recover that backup. Your suggested course of action would result in a corrupted database, so I can't imagine never work. You will be absent from the changes not only to the user data, but a number of data dictionary changes, too. The contradictions are not fixable.

• Hot backup question

  Our DBA functions are currently outsourced, and I'm just curious about something.
  
  We asked them to copy a schema from our database of Production (during the day) to its equivalents in the acceptance and Test environments. We found a problem in that the maximum value of a primary key on a table was 100121, and the sequence used to generate the value of the primary key is only 100081.
  
  Is a risk to a backup in hot and any annex a backup must be taken after hours? Or maybe did something wrong?
  
  
  Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bi

  If the request was to copy only a single schema, then it is unlikely that a "hot" backup would have been used. Most likely exp/imp or expdp/impdp would have been used to export the Production schema and import it into the other two databases.

  The sequences are always 'a problem' when export - import is used when the database is active. Export of the sequence and the export of the table (or tables) using the sequence are not at the same time / SNA so that the values can differ as they have updated in the source database.
  The plan is to restore order in the target database by manually incrementing until it reaches the desired target (100122).

  Hemant K Collette

• Hot backup

  We take the backup hot at 18:00 (daily, filled in 1-2 hours).
  At 23:30 all archive log files will be separately BackupExec backup and the log files are deleted from the file archive of the Oracle.
  
  Day before yesterday, for some reason, the copy of the data file hung up (after alter database begin backup has been published in the Hot backup script)
  That the copy has been hung up, 'alter database end backup' has been issued, the PB was in backup mode.
  The average while the deleted BackupExec database journal archive file Archive of the Oracle.
  
  Yesterday hot backup was completed successfully, only alter database begin backup failed (ORA-01146: cannot start online backup - folder 1 is already in the backup)
  After the hot backup 'alter database end backup' was published successfully.
  
  Given that logs archiving failed whien database is always in backup mode, will all the data generated duing the applied to the data file backup mode?
  
  Please notify.
  
  Thanks in advance,
  
  Arul

  You hear all changes (including the dml, ddl) applied to the database during the backup mode...

  YES.
  See http://www.bluegecko.net/oracle/oracle-tablespace-hot-backup-mode-revisited/

  Hemant K Collette

• When use REUSE/SET, no.-ARCHIVELOGS in create controlfile in HOT BACKUP?

  I am an Oracle DBA intern and I have the following queries. Good response with detailed explanations, I want to get my deleted concepts!
  
  T1 > > while a user managed hot backup, when we create a path for recovery (CREATE CONTROLFILE) control file when we use the control file created with the following options:
  * 1. REUSE / SET *.
  * 2. ARCHIVELOGS / NOARCHIVELOGS *.
  
  T2 > > in what scenarios re - create the control file while recovering the data from a hot backup files?
  
  Thanks a ton!
  Kind regards
  Blabla

  Specify REUSE to indicate that existing control files identified by CONTROL_FILES initialization parameter can be reused and overwritten.

  SET the DATABASE to change the name of the database.