disadvantages and advantages of flashback database

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• Disadvantages and advantages of Golden Gate ETL

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  kazyskiyn0w wrote:

  Hi all

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  kazyskiyn0w wrote:

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• With the help of Yosemite, I like Photos app in general; have big Aperture library, although I use rarely opening Tools. Advantages, disadvantages and pitfalls related to the migration of Photos?

  With the help of Yosemite, I like Photos app in general; have big Aperture library, although I use rarely opening Tools. Advantages, disadvantages and pitfalls related to the migration of Photos?

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• CSALTER and Flashback Database

  In 10.2.0.4, is it possible to use Flashback Database to cancel a character occupies change that was made through CSALTER? I think it fits very well, especially with CSALTER, it's just changes to the dictionary and the remapping is not the characters, but I wonder if anyone is aware of any questions/limitation in such a scenario.

  Yes. Flashback Database literally back the database to a previous point in time.

  That said... I've never tried it with CSALTER so my advice would be to validate on a test area first.

• CAN I RECOVER DELETED DATA FILE AND ITS TABLESPACE BY USING FLASHBACK DATABASE

  Hello!
  
  I CREATED THE TABLESPACE WITH ITS DATA FILE.
  
  SQL > create tablespace usmantbs datafile 'E:\oracle\product\10.2.0\oradata\orcl\usman.dbf' recording petit_fichier the size of 10 M extent management local segment space management auto;
  
  THEN, I CREATED A USER AND HIM ENTRUST THIS TABLESPACE.
  
  SQL > create default profil_utilisateur identified by Neil Leal Microsoft account unlock default tablespace usmantbs;
  SQL > grant connect, resources for Neil;
  
  I CONNECTED WITH Neil as USER AND CREATED a TABLE.
  
  SQL > conn Leal/Leal
  SQL > create table baseball (id number (9));
  
  SQL > select current_scn from v$ database;
  
  CURRENT_SCN
  ---------------------
  545863
  
  Then I deleted the tablespace including contents and data files...
  
  SQL > drop tablespace usmantbs including content and data files;
  
  I have no backup of this data file, but my database is in archive log...
  
  So I can... .flashback database to the SNA 545863 as it was before the fall... to get back my along its tablespace data file
  Wil I get my datafile back or not? Help, please...

  You can test it by yourself easily :) You will not be able to open your database
  After getting the error, just rename this data file and flashback again. Then open your database

  C:\Documents and Settings\Administrator>sqlplus "/as sysdba"
  
  SQL*Plus: Release 10.2.0.1.0 - Production on Sat Aug 1 14:20:34 2009
  
  Copyright (c) 1982, 2005, Oracle.  All rights reserved.
  
  Connected to:
  Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
  With the Partitioning, OLAP and Data Mining options
  
  SQL> shutdown immediate
  Database closed.
  Database dismounted.
  ORACLE instance shut down.
  SQL> startup mount
  ORACLE instance started.
  
  Total System Global Area  293601280 bytes
  Fixed Size                  1248624 bytes
  Variable Size              96469648 bytes
  Database Buffers          192937984 bytes
  Redo Buffers                2945024 bytes
  Database mounted.
  
  SQL> alter database archivelog;
  
  Database altered.
  
  SQL> alter database flashback on;
  
  Database altered.
  
  SQL> alter database open;
  
  Database altered.
  
  SQL> create tablespace tb datafile 'c:\tb.df' size 1m;
  
  Tablespace created.
  
  SQL> create user tb identified by tb;
  
  User created.
  
  SQL> grant dba to tb;
  
  Grant succeeded.
  
  SQL> alter user tb default tablespace tb;
  
  User altered.
  
  SQL> create table tb (id number);
  
  Table created.
  
  SQL> select current_scn from v$database;
  
  CURRENT_SCN
  -----------
       547292
  
  SQL> drop tablespace tb including contents and datafiles;
  
  Tablespace dropped.
  
  SQL> shutdown immediate
  Database closed.
  Database dismounted.
  ORACLE instance shut down.
  SQL> startup mount
  ORACLE instance started.
  
  Total System Global Area  293601280 bytes
  Fixed Size                  1248624 bytes
  Variable Size              96469648 bytes
  Database Buffers          192937984 bytes
  Redo Buffers                2945024 bytes
  Database mounted.
  
  SQL> flashback database to scn 547292;
  flashback database to scn 547292
  *
  ERROR at line 1:
  ORA-38795: warning: FLASHBACK succeeded but OPEN RESETLOGS would get error
  below
  ORA-01245: offline file 5 will be lost if RESETLOGS is done
  ORA-01111: name for data file 5 is unknown - rename to correct file
  ORA-01110: data file 5: 'C:\ORACLE\PRODUCT\10.2.0\DB_1\DATABASE\UNNAMED00005'
  
  SQL> alter database open resetlogs;
  alter database open resetlogs
  *
  ERROR at line 1:
  ORA-01245: offline file 5 will be lost if RESETLOGS is done
  ORA-01111: name for data file 5 is unknown - rename to correct file
  ORA-01110: data file 5: 'C:\ORACLE\PRODUCT\10.2.0\DB_1\DATABASE\UNNAMED00005'
  
  SQL> select name from v$datafile;
  
  NAME
  --------------------------------------------------------------------------------
  
  C:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST1\SYSTEM01.DBF
  C:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST1\UNDOTBS01.DBF
  C:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST1\SYSAUX01.DBF
  C:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST1\USERS01.DBF
  C:\ORACLE\PRODUCT\10.2.0\DB_1\DATABASE\UNNAMED00005
  
  SQL> alter database create datafile 'C:\ORACLE\PRODUCT\10.2.0\DB_1\DATABASE\UNNAMED00005' as 'c:\tb.dbf';
  
  Database altered.
  
  SQL> flashback database to scn 547292;
  
  Flashback complete.
  
  SQL> alter database open resetlogs;
  
  Database altered.
  
  SQL>
  
  SQL> select * from tb;
  
  no rows selected
  
  SQL> select name from v$datafile;
  
  NAME
  --------------------------------------------------------------------------------
  
  C:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST1\SYSTEM01.DBF
  C:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST1\UNDOTBS01.DBF
  C:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST1\SYSAUX01.DBF
  C:\ORACLE\PRODUCT\10.2.0\ORADATA\TEST1\USERS01.DBF
  C:\TB.DBF
  
  SQL> select name from v$tablespace;
  
  NAME
  ------------------------------
  SYSTEM
  UNDOTBS1
  SYSAUX
  USERS
  TEMP
  TB
  
  6 rows selected.
  
  SQL>
  

  - - - - - - - - - - - - - - - - - - - - -
  Kamran Agayev a. (10g OCP)
  http://kamranagayev.WordPress.com
  [Step by step installation Oracle Linux and automate the installation by using Shell Script | http://kamranagayev.wordpress.com/2009/05/01/step-by-step-installing-oracle-database-10g-release-2-on-linux-centos-and-automate-the-installation-using-linux-shell-script/]

  Published by: Kamran Agayev, a., July 27, 2009 14:38

• DataGuard and Flashback database

  Any sense to run a database (using the flashback database) when using Dataguard.
  We don't talk about uptime

  When to use database of flashback? (to decline the upgrades?)
  0 protection against human errors
  1 flashback database
  2 flashback Data Archive

  also should we run dataguard in a physical standby or a logical standby configuration
  1 physical standby
  And effect seen use "logical standby".

  Kind regards
  Taj

• ARCHIVELOG and flashback database

  Hello world
  
  I do not understand why the flashback database feature requires in archivelog mode.
  
  Could someone explain the reason?
  
  Thanks in advance

  This is explained in the documentation: Sur Flashback Database

  Therefore, at regular intervals, the database copy images of each block modified in each data file in the flashback logs. These block images can later be used to restore the contents of the data file from any time during which the logs were captured.

  When a database is restored to its State at some time target using Flashback Database, each block has changed since that time is restored from the copy of the block in the flashback logs more immediately before the time of the desired target. The redo log is then used to re - apply the changes since the time this block was copied in flashback logs.

  Note:

  Newspapers of recovery must be available for the entire period caused by the flashback logs, either on tape or on disk. (In practice, however, redo logs are usually needed much longer retention of flashback target to support point-in-time recovery.)
  >

  Basically, flashback logs contain any changes for all points in time. That's why redo / archive logs are needed.

• Can feature FLASHBACK DATABASE undo the loss of control of file/ORL?

  DB version: 11.2.0.4

  Platform: Oracle Linux 6.4

  I personally have not tested the FLASHBACK DATABASE feature. I came across examples of logical errors such as truncate Table being overturned on FLASHBACK DATABASE.

  I guess that FLASHBACK DATABASE feature may undo the loss of the data files. But will be a loss of control or the Group of newspapers online file again defeated using FLASHBACK DATABASE?

  Hello

  "I guess that feature FLASHBACK DATABASE can cancel the data files loss." Do not assume, check it out

  Flashback database cannot cancel the loss of data files, control files and redo log files.

  Flashback Database limitations

  Because Flashback Database works by undoing changes to data files that exist at the present time when you run the command, it has the following limitations:

  • Flashback Database can only undo changes in an Oracle database data file. It cannot be used to fix the failings of the media, or recover the accidental deletion of data files.
  • You cannot use Flashback Database to cancel a file of data reduction operation. However, you can disconnect the wizened file, flash back, the rest of the database, and then later restore and restore the shriveled data file.
  • You cannot use Flashback Database only to retrieve a data file. If you Flash back, a database at a time when a data file exist in the database, that the entry of data file is added to the control file. You can only recover the database using RMAN to fully restore and recover the data file.
  • If the database control file is restored from backup or re-created, all the accumulated flashback journal information is ignored. You cannot use FLASHBACK DATABASE to get back to a point in time before the restoration or re-creation of a control file.
  • When you use Flashback Database with a time of target during a NOLOGGING operation was underway, corruption block is likely in database objects and files of data that is affected by the NOLOGGING operation. For example, if you perform a direct path INSERT operation in NOLOGGING mode and it runs from 09:00 to 09:15 April 3, 2005, and then use you Flashback Database to return to the target time 09:07 on this date, the objects and data files updated by the direct path INSERT have finished block operation Flashback Database corruption. If possible, avoid using Flashback Database with a time or SCN coinciding with a NOLOGGING operation. Also, perform a full or incremental backup of the immediately affected data files backup after each NOLOGGING operation to ensure recovery of points in time after the operation. If you plan to use Flashback Database to return to a point in time in the course of an operation, for example a direct path INSERT , consider performing the operation in LOGGING mode.

  See: https://docs.oracle.com/cd/E11882_01/backup.112/e10642/flashdb.htm#BRADV286

• ORA-38760: this database instance could not turn on the flashback database

  Hi guys

  Without knowing it, I deleted all the files in the directory "fra" where "flashback" folder was there because of space issues. Now am facing the error.

  It's my practical database.

  SQL > startup

  ORACLE instance started.

  Total System Global Area 608174080 bytes

  Bytes of size 1268920 fixed

  184550216 variable size bytes

  419430400 of database buffers bytes

  Redo buffers 2924544 bytes

  Mounted database.

  ORA-38760: this database instance could not turn on the flashback database

  SQL > alter flashback database;

  Database altered.

  SQL > SHUTDOWN IMMEDIATE;

  SQL > STARTUP MOUNT

  SQL > select flashback_on from database v$.

  FLASHBACK_ON

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

  RESTORE POINT ONLY

  Am not able to extinguish the flame.

  SQL > select * from v$ restore_point;

  Select * from v$ restore_point

  *

  ERROR on line 1:

  ORA-38701: Flashback database log 1 seq 1 wire 1:

  "/ u01/fra/PROD/flashback/o1_mf_c1l5n3lq_.flb".

  ORA-27037: unable to get file status

  Linux error: 2: no such file or directory

  Additional information: 3

  SQL > select flashback_on from database v$.

  FLASHBACK_ON

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

  RESTORE POINT ONLY

  I also tried to create a restore point and the flashback there.

  SQL > create restore point guaranteed rspt1 flashback database;

  Restore point created.

  SQL > select * from v$ restore_point;

  Select * from v$ restore_point

  *

  ERROR on line 1:

  ORA-00600: internal error code, arguments: [krfg_get_keepseq_2], [1], [0], [0,]

  [0], [0], [0], [0]

  SQL > flashback data base to restore the point rspt1;

  flashback database to restore the rspt1 point

  *

  ERROR on line 1:

  ORA-38729: not enough flashback database data log do FLASHBACK.

  Please help me in this regard.

  Alert log file:

  ...

  ...

  ...

  Mount of redo thread 1, with mount id 305866694

  Sun 25 Oct 10:13:30 2015

  Bytes allocated of 3981204 in the shared pool for the generation of flashback buffer

  From RVWR background process

  RVWR started with pid = 16, OS id = 15486

  Sun 25 Oct 10:13:30 2015

  Errors in the /u01/oracle/product/10.2.0/db_1/admin/prod/bdump/prod_rvwr_15486.trc file:

  ORA-38701: seq 11 Flashback database log 11 1 thread: ' / u01/fra/PROD/flashback/o1_mf_c2oqypb0_.flb '.

  ORA-27037: unable to get file status

  Linux error: 2: no such file or directory

  Additional information: 3

  Sun 25 Oct 10:13:30 2015

  Database mounted in exclusive Mode

  Completed: ALTER DATABASE MOUNT

  Sun 25 Oct 10:13:30 2015

  ALTER DATABASE OPEN

  ORA-38760 marked during: ALTER DATABASE OPEN...

  Trace file:

  ...

  ...

  ...

  :() 2015-10-25 10:13:30.087 SERVICE NAME

  SESSION ID: (156.1) 2015-10-25 10:13:30.087

  ORA-38701: seq 11 Flashback database log 11 1 thread: ' / u01/fra/PROD/flashback/o1_mf_c2oqypb0_.flb '.

  ORA-27037: unable to get file status

  Linux error: 2: no such file or directory

  Additional information: 3

  1. Thank you.

  you experience serious problem... because usually it works very well.

  Try the following:

  SQL > shutdown immediate;

  SQL > bootable media.

  SQL > alter flashback database;

  SQL > alter database backup controlfile to trace noresetlogs;

  SQL > shutdown immediate;

  go to the trace file generated from running (alter database backup controlfile to trace noresetlogs ;)

  location of the trace file is located in the query:

  SQL > select * from v$ diag_info;

  It will contain the script with the SQL commands, you can rename the file with the extension ".sql".

  SQL > startup nomount

  SQL > @trace_file. SQL

  SQL > restore database;

  SQL > alter database open;

  So basically you are going to recreate the files of control again...

• Files without a NAME during the Flashback Database

  Hi all

  Why, in flashback, database, retrieve a tablespace has dropped the datafile (s) consisting of within table get renamed to UNNAMEDnnn? I was going through some examples on the internet but did not find any concrete reason as to why this happens during the flashback recovery. If the tablespace can be recreated during the process, why not data files that compose?

  Could someone help me please in my understanding.

  Thank you.

  Prithwish Adhikari wrote:

  Hello

  I was talking about the flashback database to retrieve a tablespace has fallen. Please find below the link

  http://www.DBA-Oracle.com/t_rman_159_restore_dropped_tablespace.htm

  My question is

  "

  flashback

  database to the SNA 460217.

  database of flashback to the SNA 460217

  *

  ERROR on line 1:

  ORA-38795: WARNING: flashback has managed but open resetlogs would get error

  below

  ORA-01245: offline file 5 will be lost if resetlogs is done

  ORA-01111: name for the data file 5 is unknown - rename it to the correct file

  ORA-01110: data file 5: ' / u01/oracle/product/10.2.0/db_1/dbs/UNNAMED00005'

  "

  Why, in flashback, database, the data file associated with the storage space gets renamed to unnamed?

  Thanks for the link and new info.

  The reason is the same as in these quotes from doc that I have provided. As ORA-01111 indicates the name of the actual file is unknown so Oracle creates a unique name, then stops recovery so that you can provide the name and location.

  Why, during the flashback database, retrieve a tablespace has fallen...

  This formulation and the wording of the article, is probably what is mislead you. You cannot recover a tablespace using FLASHBACK DATABASE:

  Here is the doc for FLASHBACK DATABASE

  http://docs.Oracle.com/CD/B28359_01/backup.111/b28273/rcmsynta023.htm

  Notes A Flashback Database use operation applies to the entire base. You cannot flash back, individual storage spaces. A Flashback Database operation is similar to a point-in-time data recovery (DBPITR) with RECOVER , but RMAN uses flashback logs to undo changes to a point before the time runs out or SNA

  See that second sentence? You NEED to recover the entire database and, as this quote from doc says, made it like CAMILLE by RECOVER.

  In this example, the storage space AND data files were dropped. So please check the doc to DROP TABLESPACE

  https://docs.Oracle.com/CD/B28359_01/server.111/b28286/statements_9004.htm

  Oracle database deletes all metadata about the space of storage data files and all the data dictionary tempfiles in the tablespace. The database also automatically removes the operating system all data files managed by Oracle and tempfiles in the tablespace. Other data files and tempfiles are not removed from the operating system unless you specify INCLUDING CONTENTS AND DATAFILES .

  See? No additional data in the dictionary for the tablespace or data files. Real datafiles is more if they were managed by Oracle. But there MAY be data files of the operating system if you do NOT use this last clause.

  If Oracle recreates the files using unique names and then allows you to CONFIRM that the name and location should really be.

  You have a problem with that? Or just try to understand?

• Several Flashback Database to the time prerequisites

  Current time: 17/12/2013-13:22

  Created restore point guaranteed: 10:53 09/12/2013.

  More old Flashback Time: 10:34 09/12/2013

  
  

  A Flashback Database timestamp 17/12/2013-06:30 was carried out at the 12:00 17/12/2013. (Done Resetlogs).  It's my understanding that a new incarnation is created when I resetlogs.  Guaranteed restore point was created under the old incarnation, but it seems to keep the archivelogs recovery guaranteed, even if the database has been Databased Flashback.

  Is it possible database flashback by timestamp 10:34 09/12/2013 (oldest flashback time) even if we have already done a recovery (flashback by timestamp database) at 17/12/2013 06:30?  I am concerned about corruption.

  Thanks in advance.

  See this and the ancestral discussion below: scene of Flashback and the database Point-in - time recovery

• flashback database

  Experts - which would be the overload if configure us the database of blowback in the production db, and what are the different practices for the flashback database (11g r1). How archive flashback data differs from the flashback database?

  user12075620 wrote:

  Aman thanks for your response. It is the light version of the informatica ETL process that extracts data from db2 based on simple business rules. The NFR would be maximum 1-3 minutes for each transaction. Insert operation initially and after that for the most update operation. This situation suggest the flashback database?

  Yet once, I would say that it is something that you must carefully test. Are all tables have equally important you need to keep data undo for each of them? If Yes, then flashback database is correct to be put in place, but if not, I suggest to use the data of Flashback of archives that would be specific to the table of interest.

  HTH

  Aman...

• How to use Flash recovery only for flashback database feature box

  I would use the area of flash recovery only for flashback database feature, which means, the flash recovery area will store only the flashback logs.

  I don't want to use this file system for all other files, such as files of archive log, backups, copies of control files, multiplex redo log, etc.

  is this possible? I want to use this function only for the flashback database option and therefore, I don't want to disturb any existing configuration in my database

  including backup jobs. It will also store the Archives of redo log files in the flash recovery area to use the flashback database feature?

  I can't certainly allow me to have a copy of the entire file system database as my DB size is more than the system recovery flash I have zone files.

  Thank you

  Delphine

  user13312943 wrote:

  Aman,

  I think I was not clear in my question. I'll try again

  My only requirement is to use the flashback database feature (or be prepared to use if necessary). I don't want to create a large file system to use the CRF to store all those files. Out of all the files are stored here a copy of the data files seems to consume more space. I see that these files are classified as transitional and permanent files. I agree with permanent files. I'm afraid that this file system can use more space if I store files of backup to disk. I want backups of databases to go to bands, not on the drive of FRA. Is this possible?

  Thanks for your response

  Okay, well in that case you can use RMAN and push the backups to tape drives. FLB newspapers would be stored on the FRA.

  Aman...

• Unable to do the flashback database!

  Hi all

  I activated the flashback database and created a restore point with database of flashback guaranteed so that I can do a flashback database. When I do a flashback database, its says he needs the archivelogs to perform a recovery. Flashback log usually can all have a change given in flashback logs to use for flashbacking a database. Why apply archivelogs when all the changed data does not appear in flashback log itself? please tell me.

  Kind regards

  Pradeep. V

  Hello

  Database of flashback need newspapers archives files.

  "Flashback Database is similar to traditional point-in-time recovery in its effects. To restore a database to the State at a time in the recent past. Flashback Database is much faster than the point-in-time recovery, because it doesn't require you to restore the backup data files and requires fewer changes of the archived redo logs. »

  "No file in the fast recovery area is eligible for deletion if this is required to meet a guaranteed restore point. However, archived redo logs required to meet a guaranteed restore point can be deleted after that only they are saved on disk or on tape. When you use the RMAN FLASHBACK DATABASE command, if the archived redo must convince guaranteed a restore point are not available in the area of fast recovery, then they are restored from backups of logs. »

  REF. Doc:using Flashback Database, and Restore Points

  HTH