Rollback segments

Similar Questions

• full database export error ORA-31693 ORA-01555: snapshot too old: rollback segment

  Hello

  normal full database export, I do it for my databases to which I subscribe. I recently check the export log in one of the databases, and it had the following errors:

  ORA-31693

  ORA-02354

  ORA-01555: snapshot too old: rollback segment

  my database is 11 GR 2 and the Linux environment.

  any help please?

  Hello

  This error indicates you have given LOB in your tables and binds to the parameter size undo_retention.

  Check this: https://geodatamaster.wordpress.com/2014/11/08/expdp-ora-31693-ora-02354-ora-01555/

  You must increase the size of undo_retention

• ORA-01555: snapshot too old: number of rollback segments

  Therefore on Oracle 11.2.0.2 on Solaris.  High level, we have a pretty large table on one of our Oracle dev instances, lines 430mil, where the data was populated by a large data load.  Two of our date fields have been left NULL so that we have to go back and update every row after the fact with SYSDATE values (some downstream applications require having some sort of date in this area).

  in any case, I wrote a script for this (truncated a bit for brevity):

  DECLARE
  ...
      ln_limit      NUMBER  := 10000; -- Max amount of records to process in a single bulk update statement    
      lv_total_rows INTEGER := 0;
      lv_count      NUMBER;
      lv_rowid      VARCHAR(18);
    
      CURSOR tco_cursor IS
          SELECT ROWID
          FROM LXRO
          WHERE LxModDate IS NULL;
    
      TYPE t_rows IS TABLE OF ROWID;
      lv_rowids t_rows;
    
  BEGIN
  ...
      OPEN tco_cursor;
      LOOP
    
          FETCH tco_cursor BULK COLLECT INTO lv_rowids LIMIT ln_limit;
        
          FORALL i IN 1 .. lv_rowids.COUNT
              UPDATE LXRO
              SET LxModDate = SYSDATE
              WHERE ROWID = lv_rowids(i);
  
  ...     -- (writes to log table here)          
          COMMIT;
  
          EXIT WHEN lv_rowids.COUNT < ln_limit;    
      END LOOP;
  
      CLOSE tco_cursor;
      COMMIT;
    
      EXCEPTION
      WHEN OTHERS THEN
          dbms_output.put_line(TO_CHAR(lv_rowid) || ' - ' || sqlerrm || ' - ' || TO_CHAR (ln_counter));
  END;
  /
  
  

  Only, the work runs for an hour and updates 37mil lines in a same test, and then gets the following error:

  ORA-01555: snapshot too old: rollback segment number 30 with name ' _SYSSMU30_4136132754$ ' too small

  I did some research on the error and read something interesting:

  Do not look around is committed. In other words, don't fetch on a slider was opened before the last commit, especially if the data surveyed by the slider is changed in the current session.

  Also, if the query is a loop with a commit in it, it can do the same without other queries, because finally the next iteration requires looking at his own first generation, cannot do so and barfs.

  Upping undo_retention may help, or not, as the real cause. See also v$ undostat, you may still have information in there, if it is current (or not, since at the time where you check the necessary info can be gone).

  I think that our UNDO tablspace has 16 GB now.  I do not try to hold back the 400 million lines in temp would be feasible, that's why I am committed all 10 k rows, more we ran into problems of memory with a version non-bulk this script before.  It will only be a time process (we have set our data migration to fill in these fields in future iterations).  Am I better choose to simply keep this job and re - keep on running for hours all the hours given the amount of data?  Is - this naïve to think that I could make this many updates without error in a single task running?

  Simply change the column and set the DEFAULT as SYSDATE clause. Now, you would not have to perform the update at all.

  And for the current issue, a single update could have questioned the size of the CANCELLATION. I guess that's what you're talking like memory problem. Good thing for you to do is to work with your DBA and Set configure your CANCELLATION as a result. If not enough UNDO available then you can split the update in the form of fixed numbers and run them, something like that.

  I used a 10-million limit. But you can work with your DBA and attempt to set even more.

  loop

  Update lxro set lxmoddate = sysdate where lxmoddate has the value null and rownum<=>

  commit;

  When the output sql % rowcount<>

  end;

  /

  Collect bulk copy the data in the PGA (private memory). It is a very expensive operation. Collect bulk was introduced mainly to reduce the change of context. But its performance is mediocre compared to direct SQL. So try to make your work in SQL right front.

• Question about the rollback segment when you perform the update

  Undo segment is to keep data ACI (not D). I read that it taken from the book of certification, when the update is running, all the other session will be redirected to cancel the segment to get the original version of the data. Is the rollback segment just a copy of the original version of the data? Or it's the query to return data to the original version?

  For example, the original data are:

  ID	name	address
  1	Kevin	Toronto

  Then I run the update query:

  update user name = 'Tom' where id = 1;

  What is in the segment of cancellation then?

  There ' 1, Kevin, Toronto'.

  or

  "update users set name = 'Kevin' where id = 1"?

  Thank you

  Kevin

  da5515c1-7630-4449-8c7c-e27665cec5c6 wrote:

  Undo segment is to keep data ACI (not D). I read that it taken from the book of certification, when the update is running, all the other session will be redirected to cancel the segment to get the original version of the data. Is the rollback segment just a copy of the original version of the data? Or it's the query to return data to the original version?

  For example, the original data are:

  ID	name	address
  1	Kevin	Toronto

  Then I run the update query:

  update user name = 'Tom' where id = 1;

  What is in the segment of cancellation then?

  There ' 1, Kevin, Toronto'.

  or

  "update users set name = 'Kevin' where id = 1"?

  Thank you

  Kevin

  This is another UPDATE statement that will set back to the original value NAME; which can be used to RESTORE the DML.

• 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...

• Deferred rollback segment

  Hello

  When a tablespace [except system, cancel, temp] goes into offline mode, this operation does not terminate if all transactions are active to access objects lies in the tablespace.

  All the undo generated by the operation is written in the tablespace system as DEFERED ROLLBACK SEGMENT UNDO tablespace, so that in underlying tables

  will become the uncommitted changescan cancelled online.

  My question is why this is happening [ reversal movement to undo tablespace to rollback system segment ] Although a transaction ACTIVE's Cancel can not be replaced by any other transaction.

  If the cancellation of the current active transaction in the undo tablespace cannot be replaced by any other transaction then this is cause to join the undo tablespace SYSTEM when

  a tablespace is offline?

  Thank you

  Since you will not be able to read or write to this tablespace offline, we have deferred rollback segments. If not, how it would perform a cancellation when the tablespace comes back online? A delayed segments holds only restoration of transactions which could not be completed that the tablespace has been entered. This transaction cannot be restored because the blocks in the offline storage space cannot be read or written.

  Therefore, to ensure that your transaction can be restored at the time where it is put online, segmentsm of deferred restoration which is in the System tablespace.

  Kind regards

  Suntrupth

• "Is:java.sql.SQLException error: ORA-01555: snapshot too old: rollback segment number with the name ' ' too small '.

  Hello

  We conduct apply CM which is a failure with the Error: "declared:java.sql.SQLException: ORA-01555: snapshot too old: rollback segment number with the name '' too small'."

  Its in our unique the production instance. I checked on the return parameter. Here are the details.

  SQL > show Cancel parameter

  VALUE OF TYPE NAME

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

  _in_memory_undo Boolean TRUE

  _undo_debug_usage integer 2

  UNDO_MANAGEMENT string AUTO

  UNDO_RETENTION integer 40000

  undo_tablespace string APPS_UNDOTS1

  SQL > select max (maxquerylen) of v$ undostat;

  MAX (MAXQUERYLEN)

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

  637116

  Please suggest what needs to be done to go further.

  
  

  Kind regards

  Prabhat.
  

  Post edited by: 942633

  Hello

  ORA-02067: the rollback transaction or registration required

  As mentioned, you will need to look at the design of the code:

  Error: ORA 2067
  Text: rollback transaction or registration required
  -------------------------------------------------------------------------------
  Cause: A failure (typically a trigger or a stored procedure with several updates remotely) has occurred, such as the execution of all or nothing from a previous call to Oracle cannot be guaranteed.
  Action: return to a previous point of backup or restore the transaction and resubmit.

  ------

  ORA-01555 caused by the following SQL statement (SQL ID: 5y0q4u8r2hdy9, query term s = 637608, SCN: 0x0bcc.4ed82762):

  ------

  ACTUAL SIZE [MB] UNDO UNDO RETENTION [s] NECESSARY UNDO SIZE [MB]

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

  304849 40000 267232.292

  To better help you, please let us know:

  -What is the function of this program.

  -Did you recently parameter changes until you have this error.

  Please ensure that the validation controls are implemented correctly, the DBA team and development will work hand in hand.

  Thank you &

  Best regards

• ORA-01552: cannot use tablespac system system rollback segment

  Hi all

  Environment: database Production: Source

  Database dev: target

  11203 Version database.

  Golden gate Version 11.1

  Scheme of the Golden Gate: GGATE

  Method of replication. DDL replication is ACTIVE

  In my production database my Undo tablespace is corrupted. I changed the management to cancel the manual setting and rebounded from the DB and open editing mode. Then I deleted the undo tablespace data file using in offline mode. Then I opened the database.

  SQL > alter database datafile ' / u01/app/oracle/oradata/db1/undotbs01.dbf' drop offline;

  Database altered.

  Issue.

  Now, if I try to let drop the tablespace UNDOTBS1 undo or to create the new database of the undo tablespace throws me error as below:

  SQL > drop tablespace undotbs1;

  Drop tablespace undotbs1

  *

  ERROR on line 1:

  ORA-00604: an error has occurred at the SQL level 1 recursive

  ORA-01552: cannot use system for non-system tablespace «GGATE» rollback segment

  ORA-06512: at the level of the line 993

  ORA-01552: cannot use system for non-system tablespace «GGATE» rollback segment

  Here is the status of rollback segment.

  SQL > select nom_segment, dba_rollback_segs State;

  NOM_SEGMENT STATUS

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

  ONLINE SYSTEM

  _SYSSMU10_2490256178$ IN OFFLINE MODE

  _SYSSMU9_3593450615$ IN OFFLINE MODE

  _SYSSMU8_1909280886$ IN OFFLINE MODE

  _SYSSMU7_1924883037$ IN OFFLINE MODE

  _SYSSMU6_2460248069$ IN OFFLINE MODE

  _SYSSMU5_3787622316$ IN OFFLINE MODE

  _SYSSMU4_1455318006$ IN OFFLINE MODE

  _SYSSMU3_2210742642$ IN OFFLINE MODE

  _SYSSMU2_4228238222$ IN OFFLINE MODE

  _SYSSMU1_3138885392$ IN OFFLINE MODE

  11 selected lines.

  SQL > show Cancel parameter

  VALUE OF TYPE NAME

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

  UNDO_MANAGEMENT string MANUAL

  UNDO_RETENTION integer 900

  undo_tablespace string UNDOTBS1

  Please anyone suggest me how to manage this problem.

  Kind regards

  Rohit

  Try this:

  Conn / as sysdba

  SQL > alter system set _system_trig_enabled = false;

  SQL > alter trigger sys.cdc_alter_ctable_before DISABLE.

  SQL > alter trigger sys.cdc_create_ctable_after DISABLE.

  SQL > alter trigger sys.cdc_create_ctable_before DISABLE.

  SQL > alter trigger sys.cdc_drop_ctable_before DISABLE.

  create undo tablespace, you could do now:

  SQL > create undo tablespace undotbs2 datafile 'XX/xX/XXX/XXX/undotbs2.dbf' size XM autoextend on;

  SQL > alter system set undo_tablespace = undotbs2 scope = both;

  allow them once again:

  SQL > alter trigger sys.cdc_alter_ctable_before ENABLE;

  SQL > alter trigger sys.cdc_create_ctable_after ENABLE;

  SQL > alter trigger sys.cdc_create_ctable_before ENABLE;

  SQL > alter trigger sys.cdc_drop_ctable_before ENABLE;

  SQL > alter system set _system_trig_enabled = TRUE;

  Restart the system.

• ORA-02354: Error exporting/importing data, ORA-01555: snapshot too old: rollback segment number with the name "" too small

  Hello

  I am getting below error while taking expdp backup table of BLOB.

  ORA-31693: Data Table object 'HCLM_ADMIN '. "' SCAN_UPLOADEDFILES_TEMP ' failed to load/unload and being ignored because of the error:

  ORA-02354: Error exporting/importing data

  ORA-01555: snapshot too old: rollback segment number with the name "" too small

  ORA-22924: snapshot too old

  ORA-31693: Data Table object 'HCLM_ADMIN '. "' TPA_FAXWATCHER ' failed to load/unload and being ignored because of the error:

  ORA-02354: Error exporting/importing data

  ORA-01555: snapshot too old: rollback segment number with the name "" too small

  ORA-22924: snapshot too old

  We have already set aside retention to 50000 .table structure are:

  SQL > show Cancel parameter

  VALUE OF TYPE NAME

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

  UNDO_MANAGEMENT string AUTO

  UNDO_RETENTION integer 50000

  undo_tablespace string UNDOTBS1

  SQL > alter table hclm_admin. SCAN_UPLOADEDFILES_TEMP modify lob (FILE_BLOB) (RETENTION);

  Modified table.

  SQL > select nom_de_colonne, pctversion and retention

  from dba_lobs where owner = 'HCLM_ADMIN' and table_name = "SCAN_UPLOADEDFILES_TEMP";

  COLUMN_NAME

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

  PCTVERSION RETENTION

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

  FILE_BLOB

  50000

  SQL > alter table hclm_admin. TPA_FAXWATCHER modify lob (FILEDATA_BLOB) (RETENTION);

  Modified table.

  SQL > select column_name, pctversion and retention of dba_lobs where owner = 'HCLM_ADMIN' and table_name = "SCAN_UPLOADEDFILES_TEMP";

  Column_name PCTVERSION RETENTION

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

  FILE_BLOB

  50000

  CREATE TABLE HCLM_ADMIN. TPA_FAXWATCHER

  (

  FILENAME_VAR VARCHAR2 (50 BYTE),

  DATE OF CREATED_DATE_DTE,

  FILEPATH_VAR VARCHAR2 (100 BYTE),

  DATE OF TIMESTAMP_DTE,

  FAXNO_VAR VARCHAR2 (15 BYTE),

  DEPARTMENT_VAR VARCHAR2 (50 BYTE),

  REQUESTTYPE_VAR VARCHAR2 (50 BYTE),

  TAGTO_VAR VARCHAR2 (50 BYTE),

  REMARK_VAR VARCHAR2 (1000 BYTE),

  DOCTYPE_VAR VARCHAR2 (50 BYTE),

  TAGTOVALUE_VAR VARCHAR2 (50 BYTE),

  DOCTYPE_OTHER_VAR VARCHAR2 (50 BYTE),

  HEGIC_NO_VAR VARCHAR2 (50 BYTE),

  RECORDNO_NUM NUMBER OF NON-NULL,

  FILEDATA_BLOB BLOB,

  DATE OF FAXLOCKDATE_DTE,

  NUMBER OF FAXLOCKSTATUS_VAR

  FAXLOCKBYUSER_VAR VARCHAR2 (50 BYTE)

  )

  (STORE AS) LOB (FILEDATA_BLOB)

  TABLESPACE HCLM_ALERTSVC

  ALLOW ONLINE STORAGE

  8192 CHUNK

  RETENTION

  NOCACHE

  LOGGING

  INDEX)

  TABLESPACE HCLM_ALERTSVC

  STORAGE)

  64K INITIALS

  ACCORDING TO 1 M

  MINEXTENTS 1

  MAXEXTENTS UNLIMITED

  PCTINCREASE 0

  DEFAULT USER_TABLES

  ))

  STORAGE)

  64K INITIALS

  ACCORDING TO 1 M

  MINEXTENTS 1

  MAXEXTENTS UNLIMITED

  PCTINCREASE 0

  DEFAULT USER_TABLES

  ))

  TABLESPACE HCLM_ALERTSVC

  PCTUSED 0

  PCTFREE 10

  INITRANS 1

  MAXTRANS 255

  STORAGE)

  64K INITIALS

  ACCORDING TO 1 M

  MINEXTENTS 1

  MAXEXTENTS UNLIMITED

  PCTINCREASE 0

  DEFAULT USER_TABLES

  )

  LOGGING

  NOCOMPRESS

  NOCACHE

  NOPARALLEL

  MONITORING;

  ALTER TABLE HCLM_ADMIN. (ADD) TPA_FAXWATCHER

  KEY ELEMENTARY SCHOOL

  (RECORDNO_NUM)

  USING INDEX

  TABLESPACE HCLM_ALERTSVC

  PCTFREE 10

  INITRANS 2

  MAXTRANS 255

  STORAGE)

  64K INITIALS

  ACCORDING TO 1 M

  MINEXTENTS 1

  MAXEXTENTS UNLIMITED

  PCTINCREASE 0

  ));

  CREATE TABLE HCLM_ADMIN. SCAN_UPLOADEDFILES_TEMP

  (

  NUMBER OF TEMPID_NUM

  SESSION_ID VARCHAR2 (200 BYTE),

  NUMBER OF UPLOADFILE_NUM

  NUMBER OF DOCNO_NUM

  NUMBER OF SCANJOB_NUM

  FILENAME_VAR VARCHAR2 (200 BYTE),

  FILETYPE_VAR VARCHAR2 (200 BYTE),

  FILE_BLOB BLOB,

  VARCHAR2 (200 BYTE) FLAG,

  NUMBER OF USERID_NUM

  CREATED_DATE DATE

  )

  (STORE AS) LOB (FILE_BLOB)

  TABLESPACE PHCLMDBTBS

  ALLOW ONLINE STORAGE

  8192 CHUNK

  RETENTION

  NOCACHE

  LOGGING

  INDEX)

  TABLESPACE PHCLMDBTBS

  STORAGE)

  64K INITIALS

  ACCORDING TO 1 M

  MINEXTENTS 1

  MAXEXTENTS UNLIMITED

  PCTINCREASE 0

  DEFAULT USER_TABLES

  ))

  STORAGE)

  64K INITIALS

  ACCORDING TO 1 M

  MINEXTENTS 1

  MAXEXTENTS UNLIMITED

  PCTINCREASE 0

  DEFAULT USER_TABLES

  ))

  TABLESPACE PHCLMDBTBS

  PCTUSED 0

  PCTFREE 10

  INITRANS 1

  MAXTRANS 255

  STORAGE)

  64K INITIALS

  ACCORDING TO 1 M

  MINEXTENTS 1

  MAXEXTENTS UNLIMITED

  PCTINCREASE 0

  DEFAULT USER_TABLES

  )

  LOGGING

  NOCOMPRESS

  NOCACHE

  NOPARALLEL

  MONITORING;

  Kind regards

  Hello

  First check the lob corrupt as:

  SQL > create table corrupted_lob_data (corrupted_rowid rowid);

  Table created.

  SQL > set off concat

  SQL >

  declare

  SQL > error_1555 exception;

  pragma exception_init (error_1555,-1555);

  number num.

  Start

  for cursor_lob in (select rowid r, & lob_column of table_owner. & table_with_lob) loop

  Start

  NUM: = dbms_lob.instr (. cursor_lob & lob_column, hextoraw ('889911'));

  exception

  When error_1555 then

  insert into corrupted_lob_data values (cursor_lob.r);

  commit;

  end;

  end loop;

  end;

  2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

  17.

  Enter the value of lob_column: FILE_BLOB

  Enter the table_owner value: hclm_admin

  Enter the value of table_with_lob: SCAN_UPLOADEDFILES_TEMP

  former 6: for cursor_lob in (select rowid r, & lob_column of table_owner. & table_with_lob) loop

  6 news: for cursor_lob (select rowid r, FILE_BLOB of hclm_admin loop SCAN_UPLOADEDFILES_TEMP.)

  old 8: num: = dbms_lob.instr (. cursor_lob & lob_column, hextoraw ('889911'));

  8 new: num: = dbms_lob.instr (cursor_lob. FILE_BLOB, hextoraw ('889911'));

  PL/SQL procedure successfully completed.

  SQL > select * from corrupted_lob_data;

  CORRUPTED_ROWID

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

  AAASF/AAKAABacyAAA

  To resolve this problem, we have 3 options

  (1) to restore and recover the LOB segment using physical backup.

  (2) empty LOBs affected using the UPDATE, as mentioned in the Note 787004.1statement:

  SQL > update SCAN_UPLOADEDFILES_TEMP

  Set FILE_BLOB = empty_blob()

  where rowid in (select corrupted_rowid

  of corrupted_lob_data);

  SQL > commit;

  (3) perform the export, excluding the corrupt ROWID. by adding the following to export command parameter

  Query =------"where rowid not in (\'AAASF/AAKAABacyAAA\'\) \ \" "

  Kind regards

  Alok Dwivedi

• ORA-01628: extensions # max (32765) reached for the rollback segment

  We received the error above with about 135 million lines direct-path insert.

  BANNER
  -------------------------------------------------------------------------------
  Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
  PL/SQL Release 11.2.0.3.0 - Production
  CORE    11.2.0.3.0      Production
  TNS for Linux: Version 11.2.0.3.0 - Production
  NLSRTL Version 11.2.0.3.0 - Production
  
  show parameter undo
  
  NAME                                 TYPE        VALUE
  ------------------------------------ ----------- ------------------------------
  undo_management                      string      AUTO
  undo_retention                       integer     900
  undo_tablespace                      string      UNDOTBS1

  In my research for more information on this, I was not able to find advice on resolving this when you use the automated management of the Undo (which we are).
  
  Mark DBA_UNDO_EXTENTS I see that 40% of the span are 8 blocks (our block size is 8 k). All other extensions are at least 128 blocks. (If no scopes were lower than 128 blocks then a full 32 GB datafile could not get more than 32 degrees k...)
  
  Virtually everything on this database is the batch of large volumes.
  
  Any suggestions? I see that the ROLLBACK segment incriminated exists with 32761 extents.

  could be the bug:

  Bug 10229998 : ORA-01628: MAX # SCOPES (32765) REACHED FOR the ROLLBACK SEGMENT

• ORA-01555: snapshot too old: rollback segment number with the name ' ' too smal

  Hello team,
  
  We get below error in the concurrent program, after operating for 8 hours in Instance of Test. The same program works in PROD.
  Recently, we migrated version 12.1.2 EBS EBS version 12.1.3 2. This can be root causes?
  
  Any idea on this matter is much appreciated as Tracefiles/TKProfs are unable to give us clues
  
  
  ERROR on line 1:
  ORA-01555: snapshot too old: rollback segment number with the name "" too small
  ORA-06512: at the 'APPS '. Package_name", line 170
  ORA-06512: at line 1
  
  Thank you/SReddy

  http://docs.Oracle.com/CD/B19306_01/AppDev.102/b14258/d_stats.htm#i1036461

  Also check
  http://www.orafaq.com/wiki/ora-01555

• regarding cancellations and rollback segments

  Hello
  
  I read Undo records can be stored in two segments of rollback or undo some tablespaces.
  
  When they stored in undo and when they stored in rollback segments.
  and what is the relationship between the em?
  
  Thank you
  Vijay

  However, you must understand that "transactions_per_rollback_segment" does not mean that it is a limit on the number of transactions that supports a rollback segment!
  This setting is used by Oracle to determine the number of segments of rollback it must bring online when you open a database instance.
  This applies not to the segments 'TYPE 2 UNDO' that are automatically created and managed (online, taken offline, created, abandoned as needed) when you use UNDO_MANAGEMENT = 'AUTO '.

  Hemant K Collette

• difference between roll back and the rollback segment.

  Hello
  
  
  10.2.0.1.0 Oracle
  
  What is the difference between reverse and cancel segemnt? they are an and even according to the change of version of oracle? Help, please

  Hello

  The two become the same functionality, but in oracle 9i they did simplify, because if you use rollback segments, you need to put them online in init.ora, and you must take care of management of space etc..
  so, they introduced in oracle 9i, tablespace undo you can creage undo segments and space management will take care of oracle managed files, so its reduced the load of s/n

  Kind regards
  Simma...

• data containing rollback segment file crashed

  Hello
  In one of our production box (oracle 8.1.7.4 and HP UX), data file that contains the rollback segment has crashed. To open the database, I commented the line segments rollback in init file and launched the db and submitted offline for a fall as the data file crashed
  
  ALTER database datafile ' / db10/rollback/rbs01.dbf' drop offline;
  
  and then I tried to drop the tablespace containing only datafile, but it threw an error indicating a rollback segment active R0 is always there in the tablespace. I do not know how to file the and create rollback segments. Any help would be greatly appreciated.
  
  
  Thank you
  Guna

  If the rollback segments are active, they are necessary to achieve the recovery process (roll forward was OK if you do not lose the redo, but there is a rolling back phase: read my previous post). Your database is probably not in very good condition.
  Can you post the last 50-100 lines of your alert.log?
  You have a valid backup of this data file?

• Rollback segment and log files

  Hello everyone,
  
  I have a question that intrigues me because I learned the concepts of Directors Oracle.
  
  Indeed, when a user sends a query to update (for example), server process writes in the DB the old and the new snapshot buffer cache data. He wrote the same thing in an entry form redo in the redo log buffer.
  
  Now, if the DBW is triggered before POSTING (it is possible of course), it will write the dirty block in the data file. He wrote the old cliché in a rollback segment and the new in a segment of the table. But just before that, he sends a message to the LGWR to write the corresponding entries in the redo log files.
  
  What I don't understand, is the use of the LGWR writes? Indeed, if the system breaks down at this moment, we drive the old snapshot of the data (in the rollback segment) and recovery can be performed correctly! Why do two writings of the same information in the disk in same instant; the one in the data file and the other in the log file.
  
  Thank you for the answers in advance, I hope that I was clear!

  I thought that when the DBWR is triggered, it writes ALL the blocks Sales

  Lol not always, not often 'ALL '.
  The DBWR follows a list of stamp Sales. May be asked to do a writing by a process that cannot find a tampon without (once again, that the process may not have really looked through the LMS together, only up to N buffers). DBWR doesn't then write ALL buffers Sales.

  Also, remember even when the DBWR writes all buffers, it takes time to write. He does NOT order written by "undo and table / index of a single transaction set. He just does not care if a dirty buffer's undo or a block table or index.

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

• Corrupted Fix rollback segment

  Hello
  How to fix the rollback segment damaged at 8.1.7.4 in gr 10, 2?
  
  Thank you very much

  user8803475 wrote:
  Is the other option to restore my db at a time before corruption?

  Yes, this is the option. But you loose some validated data. You have data only up to the time you restored and recovered.

  Concerning
  Anurag