The UNDO tablespace and its data file cannot be removed

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• Difference between redo logfiles, Undo Tablespace, Archive log data file

  Can some please highlight the difference between Undo and Redo Logs
  Also why we need to separate the archive logs when the recovery log data can be written directly in data files...
  
  Help you will be highly appreciated...

  Hello

  Ed gave you a very good answer.

  Rememeber database files are online and they are written to by DBWR process. So we have the database files, redo log files and archive logs.
  In order to avoid all the crawl log when you perform a recovery, database performs control points that summarize the State of the database. This operation of control point provides a shortcut to the recovery. At the checkpoint, the database knows that all incorrect pages were written to disk (for example, database files). At the time of recovery, the log (which includes-finished and unfinished transactions) is used to bring the database to a consistent state. The system locates the time of the last checkpoint and returned to this position in the log file. Then he restores forward all completed transactions (read committed) that occurred after the last checkpoint and rolls back all transactions that were not committed, but that began before the last checkpoint. This is where online log files are used.

  Now imagine that you need to back up your database GB 100 + all 10 minutes. It would be a waste of space! So you take a backup of your database at time t and backups of archiver process redo logs periodically to check the newspapers so that redo log files can be replaced and RMAN will use the last backup and archive the log files to recover your database at the time.

  Now, I mentioned the checkpoint process. The Checkpoint process regularly launches a control point that uses DBWR to rewrite all the blocks Sales in the data files, so synchronize the database. Imagine one dam is running and have exhausted all the redo log files. At this point, Oracle will wait until all Sales already queued blocks have been written to the buffer on disk (database files) foremost him redo log files can be considered as superfluous and available for re-use (i.e. can be overwritten). This will result in the following message in the alert.log:

  Thread 1 advanced to log sequence 17973
    Current log# 3 seq# 17973 mem# 0: /oracle/data/HAM1/log3aHAM1.dbf
    Current log# 3 seq# 17973 mem# 1: /oracle/data/HAM1/log3bHAM1.dbf
  Thread 1 cannot allocate new log, sequence 17974
  Checkpoint not complete
    Current log# 3 seq# 17973 mem# 0: /oracle/data/HAM1/log3aHAM1.dbf
    Current log# 3 seq# 17973 mem# 1: /oracle/data/HAM1/log3bHAM1.dbf
  Thread 1 advanced to log sequence 17974
  

  I am sure you have done the following:

  alter database mount;
  
  Database altered.
  

  When you mount a database, Oracle combines the instance started the database. Oracle control files are opened and read. However, no checking such as the restore/recovery is performed

  alter database open;
  
  Database altered.
  

  An open command opens the data files, recovery logs, it performs automatic and consistency of database recovery. At this point, the database is now ready to be used by all valid users.

  HTH,

  Mich

  Published by: Mich Talebzadeh on November 19, 2011 16:57

• Script to change the name of the file to the virtual machine and its associated files

  Hello

  I'm looking for a script to change the name of the virtual machine in virtual center and also change it has associated file names in the data store to match file name of virtual machine. But the vmdk file will contain a descriptor which maps the - flat.vmdk file. So not sure that we can achieve this through a script.

  Thanks in advance!

  Not really as much as I know.

  The advantage of the svMotion is renamed it the files (.) VMX, VMDK,...) For you.

  The only alternative would be the command line. See Duncan Howto: renaming a virtual computer.

  With the help of the plink.exe tool which could possibly be scripted.

  ____________

  Blog: LucD notes

  Twitter: lucd22

• Changing data in the undo tablespace or db Oracle buffer cache

  Hello
  
  I have serious doubt in the feature of oracle architecture, when a user issues an update statement, the data blocks are transported to the db buffer cache and where the data changes are made? Made a copy data block is stored in the cache db pads and the changes are made to the block in the buffer cache? or the copy of the data block is stored in the undo tablespace and changes are made to the blocks in the undo tablespace?
  
  In singles, the changes to the data blocks are make to the db or undo tablespace buffer cache?
  
  
  Thanks in advance
  
  Kind regards
  007

  Did you have a look to the Internet for the answer?

  In short, if a trial Oracle wants to update a record in the table, it does:

  -Read the record to be changed in the buffercache
  -Audits (the record already locked, is the update allowed)
  -Put the folder (called image before) in a rollback in the UNDO tablespace segment
  -Writing redo information about this change in the UNDO tablespace
  -Lock the record
  -Write the change in registration in the buffer cache
  -Put the change also in the redo buffer
  S ' sit and wait... (for a commit or a rollback)

  When are committed:
  -Release the lock
  -Empty folder of restoration since the UNDO tablespace
  -Write a record of this change forward in the UNDO tablespace

  When rollback:
  -Release the lock
  -Rinse the record changed the buffercache
  -Read the original value
  -Empty folder of restoration since the UNDO tablespace
  -Write a record of this change forward in the UNDO tablespace

  It of here, some more specific complexity when a checkpoint occurs between the change and the commit / rollback or redo buffer has been emptied for redo files

  Please any other s/n, correct me if I'm wrong...

  See you soon
  FJFranken

• How do I reduce the data file after the moving images to another data file

  All,
  
  I did a test of simepl to see how should I reduce my data file after the transfer of the objects thereof.
  
  I had an image in my data file USER_image, which is about 9 GB in size. I created the new data under the new tablpespace file and moved all the images in this new space of tables. So my old tablespace of image with its data file is now empty. At least there is not all user objects.
  
  Now I tried to resize the old datafile (USER_image) to a smaller value, but I keep this error
  "ORA-03297: file contains data beyond the value required to RESIZE.
  
  The file size is 9 GB and I tried to resize to 8 GB but it still does not allow me.
  
  Is it possible to resize a data file after moving all its purpose?
  I'm something wrong or missing something?
  
  Thanks in advance.

  If you old image tablespace is indeed empty (you need to run a statement against DBA_SEGMENTS to check) then you can bring it, data files included.
  After this, you can create a 'new' tablespace with the old name and desired data file sizes.

• It will frequently commit resolve ora-30036 (cannot extend the undo tablespace)

  I use 11.2.0.3 database. I confused on the use of validation to resolve ora-30036.

  I have the script in migration once that has many updates and I'm getting ORA-30036 (unable to extend segment by 4 in the "UNDOTBS" undo tablespace) .

  Our undo tablespace in NO mode autoextend and like this is just a one time event, we will not increase it.   He is currently 6 GB.

  We would commit determination ORA-30036 in my case? If not why? Is there a better solution to solve it.

  
  

  When I say commit frequent, I won't commit after each line, I just want to commit after may be million lines, so that my active cancellation extend turn into cancellation remaining will extend and Oracle will be able to use it in case of pressure of space.

  
  

  Note:

  UNDO_MANAGEMENT: AUTO

  UNDO_RETENTION: 2700

  Undo tablespace retention is NOGAURANTEE.

  I have the script in migration once that has many updates and I'm getting ORA-30036 (unable to extend segment by 4 in the "UNDOTBS" undo tablespace).

  Our undo tablespace in NO mode autoextend and like this is just a one time event, we will not increase it.   He is currently 6 GB.

  Why don't you increase it?

  You must use the correct size of UNDO necessary for the work that will be done.

  A lot of shops to create a for big lots new UNDO tablespace and then switch to it for batch processing. Once the task is completed, they switch back to the normal UNDO. That prevents the normal RETURN of autoextending far where it is normally necessary:

  ALTER SYSTEM SET UNDO_TABLESPACE

• What is the difference between the cat of the IR and IR data files in lightroom it please

  I have cat IR and IR data files in my backup. These two are big files of 500 MB, 900 MB respectively. My understanding is that these records did not contain real images but only thumbnails with the mods of lightroom. What is the difference between the cat of the IR and IR data files and should I make a second copy of both or the cat IR file

  The.lrcat is the file in your catalog. This is an important safeguard.

  The .lrdata files have previews. These can always be regenerated from the library, but it could take some time a large catalog.

  It is advisable to save them both. But if you are short on disk space, save the .lrcat file.

• undo_segments in the undo tablespace

  (1) at least how undo_segments in undo tablespace?

  Is optimal?
  If I increase the size of the undo tablespace, undo_segments counts also have increased!

  Version of DB is 10g

  Hello

   

  The two time oracle maintains exactly 10 segments. (you can see nom_segment begins by _SYSSMU11)

  I'm not clear on what exactly 10 segments. I have undo tablespace of ~ 250 GB with 6676 stored in dba_rollback_segs.

  3) why undo tablespace with the only spaceMo 46,8125 '?

  
  

  (4) I mean why he is stiil 450Mo undo_retention even through time or same validation has occurred?

  Just Oracle - Doc

  Once a transaction is committed, the undo data are more necessary for purposes of recovery rollback or transaction. However, for consistent read purposes, long-running queries may require old undo information to produce older images of data blocks. In addition, the success of several Oracle Flashback features can also depend on the availability of the old cancellation information. For these reasons, it is desirable to keep the old information of cancellation for as long as possible.

  Introduction to the management of the automatic cancellation

  With undo tablespace, you would see extended with the status ACTIVE, EXPIRED, extents still to RUN.

  Active cancellation extended are used by transactions and will be always active, because they are needed for the restoration.

  Extensions has expired are not used by transactions, the data contained in these extended is committed and the time UNDO_RETENTION is passed, so it is not necessary for the coherence of reading and can be reused.

  Not expired extensions are extended no assets but honor UNDO_RETENTION. Transactions belonging to these bodies of cancellation are determined, but the retention time has failed, and it may be necessary for the coherence of reading!

  Paste the query result - below

  ! undo_extent_stat.SQL more

  status of collar for a30

  Select the State,

  round (sum_bytes / (1024 * 1024), 0) like MB,.

  Tour ((sum_bytes / undo_size) * 100, 0) as PERC

  Of

  (

  Select the State, sum (bytes) sum_bytes

  of dba_undo_extents

  Status group

  ),

  (

  Select sum (a.bytes) undo_size

  from dba_tablespaces c

  Join v$ tablespace b on b.name = c.tablespace_name

  Join v$ datafile on a.ts # b.ts = #.

  where c.contents = 'UNDO '.

  and c.status = 'ONLINE '.

  );

  Anand

• How to reduce the UNDO Tablespace

  Hello
  We had an UNDO Tablespace to 22 GB but it's using just 2GB. How to shrink the undo tablespace. We use the database in production cluster 3 node 10.2.0.4
  Is there is way we can worry about UNDO Tablespace or should I create an UNDO tablespace and assign the undo tablespace to DB and let fall the old CANCEL?
  How to ensure that the transactions are done and free to abandon the old CANCEL?
  That's what we must restart all three nodes each node has its own UNDO Tablespace.
  
  Need help on this issue.
  
  would appreciate your quick response.
  
  
  Thank you

  No you have not.

  concerning
  Mohamed

• tablespace with multiple data files

  Hi all
  
  We have RHEL4 server with oracle 10 g 2 inside.
  
  can we create a tablespace with multiple data files? I mean while creating a tablespace itself, we should be able to create two or more data files (should not use ALTER tablespace command).
  
  If possible, please give me the SQL to do this (assume that I need to create a tablespace with two data files).
  
  Thanks in advance...

  Not so difficult isn't it?

  create tablespace datafile test
  '1.dbf' size 1 m REUSE AUTOEXTEND ON NEXT 32 M MAXSIZE 1500 M,
  '2.dbf' size 1 M REUSE AUTOEXTEND ON NEXT 32 M MAXSIZE 1500 M
  EXTENT MANAGEMENT SEGMENT LOCAL SPACE MANAGEMENT AUTO;

• Impossible to drop the undo tablespace

  Hello
  
  ORACLE VERSION: 11.1.0
  OPERATING SYSTEM: WINDOWS XP
  
  I have been uable to drop the undo tablespace. Here I create a new undo tablespace and trying to drop the old undo tablespace.
  
  I had given alter system set UNDO_TABLESPACE = newundo tablespace.
  
  And try to drop the old one and get the error like this
  

  SQL> create undo tablespace undotbs02 datafile 'F:\APP\POORNAPRASADS\ORADATA\ORCL\UNDOTBS02.dbf' size 200m;
  
  Tablespace created.
  
  SQL> sho parameter undo
  
  NAME                                 TYPE        VALUE
  ------------------------------------ ----------- ------------------------------
  undo_management                      string      AUTO
  undo_retention                       integer     900
  undo_tablespace                      string      UNDOTBS1
  SQL> alter system set undo_tablespace=undotbs02;
  
  System altered.
  
  SQL> sho parameter undo
  
  NAME                                 TYPE        VALUE
  ------------------------------------ ----------- ------------------------------
  undo_management                      string      AUTO
  undo_retention                       integer     900
  undo_tablespace                      string      UNDOTBS02
  SQL> drop tablespace undotbs1 including contents and datafiles;
  drop tablespace undotbs1 including contents and datafiles
  *
  ERROR at line 1:
  ORA-30013: undo tablespace 'UNDOTBS1' is currently in use
  
  
  SQL> drop tablespace undotbs1 including contents and datafiles;
  drop tablespace undotbs1 including contents and datafiles
  *
  ERROR at line 1:
  ORA-30013: undo tablespace 'UNDOTBS1' is currently in use

  There are active sessions that use of old undo segments. I think you should kill these sessions in order to relase these segments

  - - - - - - - - - - - - - - - - - - - - -
  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/]

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  Can we get the current username and its list of adf taskflow BPM roles?
  
  Regadrs,
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  Published by: Sam on February 28, 2013 23:17

  Yes. Please refer to the link - https://blogs.oracle.com/bpmbestpractice/entry/bpm_adf_task_forms_checking

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