ORA-01555 error, snapshot too old

I am getting this error message trying to run a report:
ORA-01555 snapshot too old: rollback segment number 4 with name "R03" too small.
No report generated.
Any help to correct the problem would be much appreciated.
null

You need to contact your DBA and ask him to tune the rollback segments or tune up your query. You need a larger rollback segment to run your report query.
null

Similar Messages

  • "Snapshot too old" for a report program

    We get "ORA-1555 error:  snapshot too old" for a report job, NOT an update job.
    We can add rollback segments to the DB.
    Why we cannot increase the commit frequency to fix this issue?
    Thanks!

    > 1. create a big rollback segment. search the web for keyword PSAPROLLBIG.
    > 2. convert to PSAPUNDO, as started by others, check SAP note 600141.
    > 3. analyze the program and if it is a Z program, ask your program to add more commits in his program.
    HI all,
    of course Stefan and Eric have already given the right hints here.
    But the main point here is not the configuration of the UNDO management.
    I know that this kind of problems bears a big mental hurdle in it, which is also difficult to jump over for many supporters.
    The notion of Undo/Rollback data beeing used mainly for ROLLBACK actions is unfortunately totally wrong.
    The primary and main usage of this data is to deliver the consistent view (as already explained in this thread).
    So the single big question here is: why does a single statement of your report needs to visit so many pages from a certain point in time?
    In the wast majority of cases this is because the statement is badly tuned.
    Maybe there is no appropriate index available.
    Or it's just written badly, so that unnecessary data must be read by Oracle.
    Maybe the CBO does something wrong which must be checked.
    Maybe the data is scattered over too many blocks and clustering them together somehow could help
    The core point here is: figure out what causes the statement to touch so many pages and fix that.
    Then you are most likely to come over this problem.
    All other recommendations, especially the move to automatic undo management: full ack.
    But the solution to your problem is to fix your statement.
    regards,
    Lars

  • ORA-01555: snapshot too old: rollback segment number 3 with name "RB02

    It just happen while processing ....

    01555, 00000, "snapshot too old: rollback segment number %s with name \"%s\" too small"
    // *Cause: rollback records needed by a reader for consistent read are
    // overwritten by other writers
    // *Action: If in Automatic Undo Management mode, increase undo_retention
    // setting. Otherwise, use larger rollback segments

  • Snapshot too Old Error - Help needed

    One of the batch job is failing due to oracle error “snapshot too old.”
    Please let me know what are the possible reason’s this problem occurs and suggest me the possible solutions to rectify this problem.
    Thanks in advance

    > this can mean different things:
    1. your rollback / undo is too small for this
    transaction,
    Incorrect. A snapshot too old means that a consistent read cannot be maintained. A read is not a transaction - it does not cause any locks on rows.
    What is can mean that rollback is too small to maintain a consistent read for a sufficiently long enough period for the consistent read to be completed.
    > 2. commits aren't made often enough,
    NOT TRUE!! Not in Oracle. (sorry for the emphatic bold, but this an OWT within Oracle - it is very far from the truth in Oracle and Oracle is not SQL-Server)
    > 3. there are concurrent transactions which act on the
    same tables.
    This is usually the case - more accurately, fetching across commits. This is caused by creating a consistent read on a table (opening a cursor in PL/SQL), reading the rows (fetching from cursor in PL/SQL) and then updating those exact same rows.
    The consistent read deals with version n of the table. At the same time the exact same process updates those very same rows creating new versions of those rows.
    Rollbacks are overwritten (it is a circular buffer) and the version n of the rows cannot be maintained and "goes out of scope" as the rollbacks containing that version of the rows are re-used.

  • ETL Process - snapshot too old

    Hi friends:
    I would like to get some comments from you about the following situation:
    In an ETL process, usually we have gotten the Oracle error "Snapshot too old". We are doing various modifications in our ETL process (developed via PL/SQL or OWB), however, we have not had success. Could you give me some advise in order to avoid this problem?
    Thanks in advance.

    It's sth with your Rollback segment settings.Pls set the MINEXTENTS more larger and set OPTIMAL,if the sutiation still occurs,get the rollback segment offline first and then re-online the rollback segment.

  • Receiving error ORA-01555: snapshot too old:

    Need some info...
    Currently seeing ORA-01555: snapshot too old: rollback segment number 18 with name "_SYSSMU18$" too small.
    Info:
    SQL> show parameter undo
    NAME TYPE VALUE
    undo_management string AUTO
    undo_retention integer 4200
    undo_suppress_errors boolean FALSE
    undo_tablespace string UNDOTBS_1
    SQL> select max(maxquerylen) from v$undostat;
    MAX(MAXQUERYLEN)
    35792
    SQL>
    run this based on threads in here:
    SQL> select (35792/60)/60 query,(4200/60)/60 retention from dual;
    QUERY RETENTION
    9.94222222 1.16666667
    I need some help figuring out what to set my undo_retention to? Should it be 36000?
    Any help is appreciated.
    Thanks

    Jamie CC wrote:
    The query that was in the alert log was running against a table with 779 rows. The query uses the index (not worried if it wouldn't for that small a table) and came back in one second... This makes no sense. Is it possible that there was a sub-query running and the wrong query was put into the alert log?More likely the query in the alert log was one that died, but the cause was a different query. Remember, the meaning of an ORA-1555 is that the query needed to go back to undo in order to gather a view of the data to a certain SCN, and the data had already been aged out. So the alert log gets the one that died, but the cause is another one. Feel lucky at that, in older versions it was considered an app error IIRC.
    Search for the error on asktom.oracle.com for a number of scenarios, and you might want to review the part of the concepts manual about read consistency to make sense of it all. You might also find Tom's book explanation about it with a google search.
    Also, depending on your version, there may be things to set like retention guarantee.
    I've found on the ERP/MRP systems I work on these errors will appear weekly from people leaving sessions connected after they go home, so I kill 'em off at night. And that's with an undo nearly as big as the db data, that's normally almost empty.

  • The nature of "ORA-01555: snapshot too old..." error

    Hi all,
    Please help me to understand the nature of this error:
    ORA-01555: snapshot too old: rollback segment number 23 with name "_SYSSMU23_755263746$" too small
    One of reports returns this error. Yes, I googled it, but honestly I can't understand deeply what causes it. Usually I resolve it by performing sql request on yesterday's copy of production database. Is it correct to say that this error happens when I try to perform request on tables that are changed in the same moment? What is correct solution to resolve it other than using yesterday's copy of production database?

    marco wrote:
    Antonio,
         The problem is generally small segments of undo, you need to add more space or put guaranty the tablespaces.
    How do I describe it for our DBA (how much extra space do I need and what is the name of tablespace)?
    Before you go to your DBA, you should figure out how much space your largest query/update uses. That is, your biggest transaction, how much space does it need? 10M? 100M? 1G? From there, your DBA can then size your UNDO properly (or at least "more better" ).   Yes he "name of the tablespace" is just called "UNDO").
    As mentioned before, the solution might not even be to increase your UNDO size, but rather to identify the "problem job", and fix it. That's not easy, however, talk to your DBA, he may be able to help with that as well.
    Things to look for:
    1) a job that issues a lot of commits. (suspicious - try to reduce # of commits).
    2) a job that runs for a long time and updates along the way (suspicious - try to reduce run time).
    3) a job that runs for a long time and has no updates (try to reduce run time - in this case, if this job starts running, and then takes a long time, a lot of other jobs may be reasonably doing updates, and this long run query needs to reference a row that was updated - it might lose it in the UNDO, though).
    4) long running queries running at same time as updates on same table. (not always possible, but think about it: a "long running query" is often a "report" of some sort (not always, but often). Try to schedule the reports when less update activity is expected. Or, if the updates are part of the same batch, try to schedule them after each other so they don't overlap. (if the updates are online users, there isn't much you can do except try to decrease runtime of the long running query).
    You DBA can help find candidates for those cases.

  • UNdo error (ora-01555) - Snapshot too old error

    Hi,
    If undo get filled and if we get a snapshot too old error then what is the solution for this error, plz give step by step solution for this.

    You prevent ORA-01555 errors by
    1) Setting UNDO_RETENTION equal to or greater than the length of the longest running query/ serializable transaction in the system
    2) Ensuring the UNDO tablespace is large enough to accomodate the amount of UNDO generated over that period of time.
    You would need to determine things like the length of your longest running query, the amount of UNDO getting generated, etc. and adjust your UNDO_RETENTION and UNDO tablespace accordingly.
    Justin

  • Oracle error: Ora-01555 : snapshot too old: rollback segment number 1......

    System Error: Unknown Database error (type qqdb_ResourceException) on WMS_WH1: Execute failed for SQL statement ............... error from database is: ORA-01555: snapshot too old: rollback segment number 1 with name "_SYSSMU1$" too small...
    Any ideas ? Please help.
    Thank you.

    You either have
    - an UNDO tablespace that is way too small (rollback segments that are too small); or
    - an application that does way too many COMMITs (common with apps ported from SQL Server)
    From the added info, I would guess that the Java program has a major loop and does processing on each of the values it gets in that loop. At the end of each turn in the loop, it does a commit. Then it tries to look at the next record in the master list. After a while (say around 388 loops ;-) ) it dies.
    The reason is that when it looks for information in the master query, it needs to rebuild that information to the moment that query was initiated. It uses rollback (AKA undo) to rebuild that. But rollback is not guaranteed to exist after a commit (unless forced) and once a commit happens, that area can be reused. When it is reused, the information is no longer there to rebuild the row, and that raises an ORA-01555
    Edited by: Hans Forbrich on Sep 11, 2009 3:44 PM

  • ORA-01555: snapshot too old error while ANALYZE command!!!

    Hi All,
    I have 2-node 10gR2 RAC on RHEL4. The database is working fine. And i am able to import the schema also. But when i try to analyze all the tables in schema..i'm getting the following error...my undo_tablespace is of 1.2GB in both instances of RAC. and unde_retention is set to 900 (default).
    ORA-01555: snapshot too old: rollback segment number with name "" too small
    Please, can anybody tell me what might be the problem?
    Thanks
    Praveen.

    Hi,
    When the analyze of the table is going on, lot of dml activity is also going on to the table. So run the analyze when there is minimal dml activity on the table. Increase undo_tablespace,undo_retention might help your scenarios.
    10g has got guaranteed undo retention, you can also use that.
    Regards,
    Satheesh Babu.S
    http://www.satheeshbabus.blogspot.com

  • ORA-01555: snapshot too old error

    While i was trying to run the following anonymous block to analyze all the tables and indexes in my schema, it ran for approx. 5 hours and ended up with
    ORA-01555: snapshot too old error
    Can anybody explain me why this happened?
    SQL> DECLARE
    2 CURSOR tab_cur
    3 IS
    4 SELECT table_name
    5 FROM user_tables;
    6
    7 CURSOR indx_cur
    8 IS
    9 SELECT index_name
    10 FROM user_indexes;
    11 BEGIN
    12 FOR rec IN tab_cur
    13 LOOP
    14 EXECUTE IMMEDIATE 'ANALYZE TABLE '
    15 || rec.table_name
    16 || ' COMPUTE STATISTICS';
    17 END LOOP;
    18
    19 FOR rec IN indx_cur
    20 LOOP
    21 EXECUTE IMMEDIATE 'ANALYZE INDEX '
    22 || rec.index_name
    23 || ' COMPUTE STATISTICS';
    24 END LOOP;
    25 END;
    26 /
    DECLARE
    ERROR at line 1:
    ORA-01555: snapshot too old: rollback segment number 13 with name "_SYSSMU13$"
    too small
    ORA-06512: at line 12
    Elapsed: 05:01:26.08
    Thanks and Regards
    --DKar                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                           

    Your cursor loop uses the database catalog.
    The analyze updates the database catalog -- including some of the same tables required by the cursor loop.
    The undo retention was not sufficient to hold all of the undo necessary to maintain read consistency of the catalog.
    Try using something like this, instead.
    -- for 9i
    BEGIN                                 
    DBMS_STATS.GATHER_SCHEMA_STATS (
              ownname               => '<YOUR SCHEMA>',                    
              estimate_percent      => DBMS_STATS.AUTO_SAMPLE_SIZE,          
              block_sample          => TRUE,        
              method_opt            => 'FOR ALL COLUMNS SIZE AUTO',
              degree                => 6,
              granularity           => 'ALL',
              cascade               => TRUE,
              options               => 'GATHER'
    END;                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   

  • ORA-01555: snapshot too old: rollback segment number 3 with name "_SYSSMU3$

    A Materalized view is scheduled to update every 12 hours . When it has tried to update it has thrown the error ...
    ORA-12008: error in materialized view refresh path
    ORA-01555: snapshot too old: rollback segment number 3 with name "_SYSSMU3$"
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    ORA-06512: at "SYS.DBMS_SNAPSHOT", line 860
    ORA-06512: at "SYS.DBMS_SNAPSHOT", line 841
    ORA-06512: at line 1

    Hi,
    Can you increase the size of the UNDO Tablespace ?
    For more information, you can find on this link below:
    http://forums.oracle.com/forums/search.jspa?threadID=&q=ORA-01555&objID=c84&dateRange=all&userID=&numResults=15
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  • ORA-01555: snapshot too old

    Hi,
    We have audit component, one responsibility of which is to archive audit messages from Oracle database. The component fails on a simple select statement (provided below) that retrieves number of records to be archived based on age parameter:
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    If somebody has experience in resolving "ORA-01555: snapshot too old" exception problem please share you experience with us. Any help will be appreciated.
    Thanks,
    Aleks

    how many rows in ur tables.
    select count(*) from blobobjtable blbt
    SQL> show parameter undo
    NAME                                 TYPE        VALUE
    undo_management                      string      AUTO
    undo_retention                       integer     300
    undo_tablespace                      string      UNDOTBS1
    SQL> select count(*) from sm;
      COUNT(*)
       1326661
    Elapsed: 00:00:03.53
    SQL> select count(*) from sm;
      COUNT(*)
       1326661
    Elapsed: 00:00:03.45
    SQL> select count(*) from sm ss,ac_taj@taj ac
      2  where ss.nserial = ac.nserial;
      COUNT(*)
         88763
    Elapsed: 00:00:38.35
    SQL> show parameter db_name
    NAME                                 TYPE        VALUE
    db_name                              string      db02
    SQL>i have some configuration of undo tbs. but i am not getting any error. also i am just startup my database if right know i am only one user connected to database.
    SQL> select  bytes/1024/1024 "UNTO MB" from dba_data_files
      2  where tablespace_name = 'UNDOTBS1'
      3  /
       UNTO MB
           930

  • Snapshot too old ORA-01555 from select statement (discoverer)??

    Hi All
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    simon.9999 wrote:
    Hi All
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    My understanding is that undo is generated from select/insert/update.
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      "  bla bla
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    The SELECT statement is the victim.
    Some session is doing DML against the same table against which the SELECT occurs & is likely doing COMMIT inside a LOOP.

  • ORA-01555: snapshot too old: rollback segment number 8 with name

    Hi,
    Database version is Oracle8i Enterprise Edition Release 8.1.7.4.0
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    ROLLBACK05 RBS1 SYS ONLINE
    ROLLBACK06 RBS1 SYS ONLINE
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    ROLLBACK09 RBS1 SYS ONLINE
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    ROLLBACK07 3 62906368 262144000 62906368 1 ONLINE
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    ROLLBACK04          62906368     34     3     0 262144000 lookup
    ROLLBACK05 OPS$RTRADM     41934848     28     2     0 262144000 No Command
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    ROLLBACK07 OPS$RTRADM     62906368     25     3     0 262144000 lookup 50
    ROLLBACK08          62906368     32     3     0 300146688 lookup
    ROLLBACK09 OPS$RTRADM     62906368     20     3     0 262144000 Select
    ROLLBACK10 OPS$RTRADM     62906368     24     3     0 262144000 lookup 50
    SYSTEM               770048     0     7     0     lookup
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    lm**** wrote:
    Hi,
    Database version is Oracle8i Enterprise Edition Release 8.1.7.4.0
    I am struggling to fix this error, since I have not worked on 8I DATABASE.
    We getting this kind of error very frequently in one of the 8i database.
    ORA-01555: snapshot too old: rollback segment number 8 with name "ROLLBACK08" too small
    How do i fix this permantely. upgrade to supported Oracle version since V8.1.7 has not been supported this Century.

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