what background process contributes to writing data undo to undo tablespace

Similar Questions

• What background process is used for data files retriving data

  Hello
  
  What background process is used to retrieve data from data files
  
  as I know dbwn is used to write the data to the SGA buffer cache in data files
  
  and I want to know that when the recovery of data from the data file in the buffer cache that back ground process is used
  
  I want to process structure
  
  Thank you
  
  Gita

  Hello

  What process will write to connect to buffer?

  Process server :)

  Kind regards
  Rakesh Jayappa

• What background process or service using the shortcut key?

  Hello

  I changed a few settings in "msconfig" and now my "Toshiba hotkeys" no longer work. I tried to activate several processes and services, but I can't seem to find the right... Someone can tell me what process or service is it?

  THX

  Hello

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• Dropped connections and background processes

  I like the new ability to a background process, but I would like to know what background processes are underway and how long they have been broadcast.
  
  I recently had problems with connections dropped with our databases because of a recent. The problem is associated with the network not DB related exactly, but it would be nice not to have to manually disconnect and reconnect again. When we get the error - the connection has been lost or not connected, for me, it would be logical to be reconnect automatically or "Refresh" the connection via a button. I know it's a pending issue in sqldeveloper, but I can't believe it's so hard for developers to add this feature. It's happened to all that, take 30 minutes, coding for this problem? Thank you.

  To see what background processes are running you will need to use the progression of tasks pane (view > the task progress)-this will show in the progression of tasks as well as those who filled by mistake (I think it's he who filled watch tasks - it shows certainly tempted with errors of syntax of queries).

  On reconnecting, the current 2.1.1 version is a step back from recent versions facing better, trying to reconnect automatically upon detection of an interruption of the connection. I hope that, this reconnection will be corrected in the next release, but we will have to wait and see. As you suggest, an option menu to reconnect when the first disconnects and then reconnects likely shouldn't be too hard, but I guess that the development team thinks that the manual reconnection is quite low priority because it would only save two mouse clicks on four with the existing connection right click menu - especially if they are working on the automatic reconnection of fixation.

  theFurryOne

• 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

• Treatment of shocks and expire in background processes

  Hello
  
  One can tell me what exactly the process of shocks & process of timeout parameter means in the Workflow background process? Generally, we submit the process by keeping settings Yes.
  
  Thanks in advance for your help.
  
  Kind regards
  Jyoti

  Jyoti

  Deferred process: Present a great advantage of integrating your workflow process. An example is the booking order. It comes in two flavors. Deferred and online. When you use deferred essentially booking what you say the system is to give control back to the user and to "postpone" the booking process to the Workflow Engine background making the booking a batch process. This translates into faster data entry orders in high-volume industries. So if you say this setting as Yes if it runs the process of GBM what you say to pick up all the process workflow which are deferred to be dealt with by you (GBM).

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  Thank you
  Claire

• Satellite Pro A120 - what Toshiba process may be excluded from the start-up?

  My old A120 has more than 50 processes in the Task Manager, before I even open a browser or other application.

  This seems too much for a machine with a processor of 1.46 GB (and half a GB of RAM).

  Many of them are processes of Toshiba and disturbing as if they are associated with the operation of the equipment.

  Is there a list anywhere of the Toshiba process which can safely be disabled - and advises how to proceed?

  Hello

  Each laptop has different pre-installed software and so different processes are run in the context of the operating system.
  There is no general answer that the process could be disabled.

  Fact is that notebook Toshiba supports many different features that need additional software.
  If you n t want to use features like the keys FN, Toshiba control buttons, etc. then you could disable the process responsible for this feature.

  If you n t know exactly what do a certain process, then goggle just for some details. There are many Web sites with a different database that contains information about the Windows background process.

  Then you can access the MSCONFIG and in the Startup tab you could disable some processes just to test.
  In the worst case if something does not work you can turn it back on.

  See you soon

• Showing a standby screen while the background processing

  Hi all

  I implement a wizard have been I let the user fill in some parameters of network connection. When the user clicks 'next' I want to run a background process to see if the entered parameters are correct. According to the result of the background process, the wizard can continue to the next screen or remain on the current screen.

  There must be something like this:

  boolean onNext()
  {
    // Executed when the user presses 'next' (run in the EDT)
  
    // Show a wait popup
    UiApplication.getUiApplication().pushScreen(progressPopup);
  
    // do my network stuff
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        // ...
        success = true;
      }
     });
  
    // hide the popup
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    // return whether the network stuff was successful
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  }
  

  This does not work because the popup does not appear. How can I achieve that?

  Thanks in advance!

  Modal screen is very good and has some advantages, in that it means that your logic that knows what it is in the State.

  What you want to do depends on the application.  For example, we have a server locator tool, the user launches the search, then we do not secure anything, except that they cannot launch a new search until they cancel the old one.  Alert us when the search is completed or dead or expired.

  With a modal form (and we do too) I personally like this to have a Cancel button, so that the user can stop waiting - which complicates the Interface.  In fact, there is a case for the wireless network to bring an observer of the screen modal, so that he knows that he has to ignore the answer if the screen has been cancelled.

• 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

• Great for the background process paging space

  Hello
  in my former base 9.2 (on AIX) I see paging high use of space for background processes.
  

  #> svmon -Pg -t 1 |grep Pid ; svmon -Pg -t 10 |grep "N"
       Pid Command          Inuse      Pin     Pgsp  Virtual 64-bit Mthrd  16MB
   2285578 oracle          304609    81552   500909   605395      Y     N     N
   3350676 oracle          304588    81552   500643   605149      Y     N     N
   1794254 oracle          304592    81552   500634   605126      Y     N     N
   2744508 oracle          304567    81552   500189   604671      Y     N     N
   2588796 oracle          304700    81552   499905   604421      Y     N     N
    708788 oracle          304657    81552   499842   604336      Y     N     N
    598034 oracle          304621    81552   499696   604182      Y     N     N
   3035252 oracle          304666    81552   499662   604167      Y     N     N
   2736282 oracle          239031    81552   418381   522499      Y     N     N
   1220740 oracle          238960    81552   418310   522410      Y     N     N
  
  #> ps -eaf|grep 2285578
    ora9R2 2285578       1   0   Mar 01      -  0:28 ora_pmon_MYDB
  
  #> ps -eaf|grep 3350676
    ora9R2 3350676       1   0   Mar 01      -  0:34 ora_dbw0_MYDB
  
  #> ps -eaf|grep 1794254
    ora9R2 1794254       1   0   Mar 01      -  1:24 ora_ckpt_EGOV

  The database do nothing (from 09:00 to 17:00):
  

  Load Profile
  ~~~~~~~~~~~~                            Per Second       Per Transaction
                                     ---------------       ---------------
                    Redo size:                852.37             37,511.73
                Logical reads:                 31.39              1,381.25
                Block changes:                  3.35                147.35
               Physical reads:                  0.09                  3.96
              Physical writes:                  0.16                  6.89
                   User calls:                  2.24                 98.51
                       Parses:                  1.33                 58.34
                  Hard parses:                  0.10                  4.27
                        Sorts:                  0.63                 27.93
                       Logons:                  0.01                  0.61
                     Executes:                  2.07                 91.04
                 Transactions:                  0.02

  But the free bolt is 40%:
  

  Top 5 Timed Events
  ~~~~~~~~~~~~~~~~~~                                                     % Total
  Event                                               Waits    Time (s) Ela Time
  -------------------------------------------- ------------ ----------- --------
  latch free                                          1,580          88    42.63

  File system mount options are correct (cio of dbf, etc.)
  Parameter:
  

  filesystemio_options                 string      async
  disk_asynch_io                       boolean     TRUE
  optimizer_mode                       string      RULE

  Any ideas why it uses a lot of paging space?
  Thank you.

  Mr.D. says:

  sb92075 wrote:

  Mr.D. says:
  Hello
  in my former base 9.2 (on AIX) I see paging high use of space for background processes.

  What value will the use of paging to be OK to be 'high '?
  Is this true & valid value for EACH database on this planet?

  Do you realize that the modern BONES are actually DESIGNED for the page?
  So why is that a bad thing, report you it?

  Yes I realize
  But if topas show me about 20% wait for I/O and the affected hdisk is the swap and it is occupied about 97 to 100%
  I think that there is a problem.

  Thank you.
  >
  >
  >

  Hello
  in my former base 9.2 (on AIX) I see paging high use of space for background processes.

  What value will the use of paging to be OK to be 'high '?
  Is this true & valid value for EACH database on this planet?

  Do you realize that the modern BONES are actually DESIGNED for the page?
  So why is that a bad thing, report you it?
  Yes I realize
  But if topas show me about 20% wait for I/O and the affected hdisk is the swap and it is occupied about 97 to 100%
  I think that there is a problem.

  Thank you.
  If the OS is really trading & Oracle is only application on the server system, then SGA is too big.

• State of background processes in Essbase Administration Services

  When we submit a script calc for processing in the background rest status 'queued' and will not be processed. I tried to find documents related to this configuration of background processes. I guess we must change a setting in XML file somewhere on the Essbase server. Please let know us if you have knowledge of the location of the documentation or what setting needs to be changed in order to jobs are not queued for processing.
  
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  Thank you
  Sheik
  
  
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  number of l_job;
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  );
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