Retention for the individual rollback segment

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• General - rollback segments

  Read manuals, I have a few question to clarify about rollback segments (cancellation automatic management side and can leave undo tablespace)
  
  (1) rollback segments can be created in a tablespace - is there a limit/maximum size that can be specified for a rollback segment to use within a tablespace? -To read manuals, does not mention the clause of storage on the size/max limit for a rollback segment; is it possible for the rollback segment to fill tablespace (UH because of some queries Wired [consistent playback] / transaction)?
  
  (2) we can create a separate rollback tablespace and have several rollback segments.
  
  If there are 3 user tablespaces (T1, T2, T3), 1 (RT) rollback tablespace.
  -J' I create 1 rollback segment in tablespace T1, T2, T3
  -J' I create 2 rollback segments in a tablespace rollback RT
  
  A user with "tablespace T1 default" when you run a transaction, what rollback segment will be used by this user (when the rollback segment is not specified explicitly)?
  
  
  Oracle-student

  user11359766 wrote:

  The transaction will overflow to the second rollback segment (IE start using the 2nd rollback segment that is available and not used by another active transaction) or oracle returns an error since the first segment of cancellation assigned is full and that the transaction is always active?

  This will apply to both SMU and MMU.

  The same link above.
  http://download.Oracle.com/docs/CD/B10501_01/server.920/a96524/b_deprec.htm#634941

  For the duration of a transaction, the associated user process writes restore only information for the assigned rollback segment.

  I hope that its explicit transaction cannot roll any other rear roller segment once its own lot of space. In the case of EMS, also, if the undo datafile cannot grow, your transaction would be arrested.

  HTH
  Aman...

• user managed backup and deferred tax rollback segments

  Hi Forum,

  Greetings of the day,

  Here I have a question about segments of rollback backup and deferred users managed, I don't have much experience with the user managed backups taken by backup of BEGIN and END.

  1. how facilities oracle using the database so that it is saved each tablespace, he will use deferred rollback segments?

  2. placing the tablespace in backup mode is the same as read-only mode, on a technical level. So that it can read the blocks and changes made by the user can be moved to deferred rollback segments and later applied to tablespace, when it is the backup of the END?

  3.AFAIK, will be created only to deferred rollback segments in the SYSTEM tablespace. So we need to keep an eye on the growth of the tablesace SYSTEM while the database/tablespace is backed by this method?

  4. when the tablespace is put out of backup by using the backup of the END , will be that it applied by the deferred rollback segments?

  5. where oracle will place deferred rollback segments, when tablesapce SYSTEM itself is implemented backup START ?

  6. DON'T face us any kind of failures during all backup /END START as full tablespace etc SYSTEM.

  Your answers will really helpful.

  Thank you

  Uday

  Here I have a question about segments of rollback backup and deferred users managed, I don't have much experience with the user managed backups taken by backup of BEGIN and END.

  1. how facilities oracle using the database so that it is saved each tablespace, he will use deferred rollback segments?

  In what context you mention the use of rollback differed with the backup segments maintained by users?

  2. placing the tablespace in backup mode is the same as read-only mode, on a technical level. So that it can read the blocks and changes made by the user can be moved to deferred rollback segments and later applied to tablespace, when it is the backup of the END?

  Do you mean to say that when the tablespace is backed up, it is not accessible to the DML? If so, this is a wrong concept. Oracle did not go for the rollback segment (which I do not know how you are linking anways), but maintains the writing the image in full blocks for the first time in the log files of recovery following the normal writing changed buffers.

  3.AFAIK, will be created only to deferred rollback segments in the SYSTEM tablespace. So we need to keep an eye on the growth of the tablesace SYSTEM while the database/tablespace is backed by this method?

  Response above asked about segment deferred cancellation and their relationship, according to you, with the backup tablespace?

  4. when the tablespace is put out of backup by using the backup of the END , will be that it applied by the deferred rollback segments?

  5. where oracle will place deferred rollback segments, when tablesapce SYSTEM itself is implemented backup START ?

  6. DON'T face us any kind of failures during all backup /END START as full tablespace etc SYSTEM.

  Seems that you don't really have an idea how the backups managed by users actually work. I'll suggest that you read about it first in the backup and restore documentation before entering in any event.

  HTH

  Aman...

• Rollback segments

  Hello world
  
  I was living performance oracle tuning guide and try some examples with the explain plan command...
  All of a sudden I'm thinking on the RBS (rollback segment), can someone explain to me what kind of info is present in rollback segments (I know the front of the image of the block is stored in the segment of cancellation for read consistency and rollback) here's a scenario that I'm trying to understand, lets say I have a few blocks in the buffer cache and are not compatible from my start time of query. so now what will do the oracle did it'll recover the consistent blocks from the rollback segments or apply changes to the current block to get a coherent picture of the blocks in the SGA. Thanks in advance for your help...

  Oracle clone the buffer memory, and then restore the image of the lines required by "rolling back" based on the information in the Restore / Undo segment.
  This can cause multiple copies of the same buffer to coexist in the buffer cache, if there are several sessions to try to generate a coherent image in reading a block - especially if each of them requires a different image of "point-in-time '!

  Hemant K Collette

• rollback segment ALTER

  Hello
  in 8.1.7
  When do the following:
  rollback segment RBXX shrink; ALTER
  
  What we should check before? How to see if any current transaction?
  Thank you.

  -to check for any transaction

  SELECT s.username, s.SID, t.xidusn, t.ubafil, t.ubablk, t.used_ublk
  V $ session s, v$ transaction t
  WHERE s.saddr = t.ses_addr;

  Concerning
  Asif Kabir

• optimum value of Rollback segment

  Hello
  
  I need set the optimal value for the rollback segment. The storage rollback segment parameter values are
  
  initial of 1 M, according to 2 M.
  
  Suggest me what is the optimal setting for these rollback segments.
  
  Rgds...

  Two differing suggestions:

  1. do NOT set to OPTIMAL value

  2. set MAXIMUM value which is high - to larger sizes, made by rollback segments.

  You can query DBA_ROLLBACK_SEGS and V$ ROLLSTAT to determine the sizes they grow usually to-to the point where you decide (or have an automated work) to shrink / recreate (drop or create) segments.

  Parameter that a low value can mean that your Rollback Tablespace has no need to be very large, but it can cause an increased number of ORA - 1555-particularly bad cause if these jobs to fail.

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

• transactions in rollback segments table

  Hi guys,.
  
  I read the following, but I'm still having a bit of difficulty to conceptualize. Someone would be so kind to give me a very brief example?
  
  Thank you
  
  For each rollback segment, Oracle maintains a table of transaction - a list of all transactions that use the associated rollback segment and entries of restoration for each change made by these operations.

  Whenever the transaction happens, there is an entry that is maintained by oracle to control that in which the segment, in which block cancellation of the transaction is maintained. The table which is now it is called Transaction table. The transaction entry is maintained for giving this information of cancellation for queries that seek when you need for coherent picture playback. Location of corresponding cancellation information are also maintained in the header of the block also Transaction as cancel Byte Address (UBA).

  The operating table is for us, V$ transaction. If you look at the XIDUSN, XIDSLOT, XIDSQN columns in this table, you would be able to see the segment where the cancellation of the transaction is maintained. Fixed to cancel arrays are x$ ktuxe and x$ ktcxb (hopefully, I did not error in names).

  I'll see if I can find good paper describing this.
  Update:

  Here are two links that I hope will be useful.
  http://www.evdbt.com/AutomaticUndoInternals.PDF
  http://www.juliandyke.com/presentations/RedoInternals.pp

  Do a lot of block of dumping, a very good way to know this stuff.
  HTH
  Aman...

  Published by: Aman... on March 10, 2009 01:10

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