Request got errror as ORA-01555: snapshot too old: rollback segment number

hi Consultants,
reqeust gor errores as ORA-01555: snapshot too old: rollback segment number 50 with name "_SYSSMU50$" too small ORA-06512: at line 90
anyone please advice me on this.
Thanks,
Anu.

Thanks for ur reply
Is this a standard or custom concurrent program?This is customer program it is working fine if run as individual
Thanks,
Anu

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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$"
too small
ORA-06512: at "SYS.DBMS_SNAPSHOT", line 803
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
Cheers

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

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.
I have verified the RBS configured in the db.
SEGMENT_NAME TABLESPACE_NAME OWNER STATUS
SYSTEM SYSTEM SYS ONLINE
ROLLBACK0 SYSTEM SYS OFFLINE
ROLLBACK02 RBS1 SYS ONLINE
ROLLBACK03 RBS1 SYS ONLINE
ROLLBACK04 RBS1 SYS ONLINE
ROLLBACK05 RBS1 SYS ONLINE
ROLLBACK06 RBS1 SYS ONLINE
ROLLBACK07 RBS1 SYS ONLINE
ROLLBACK08 RBS1 SYS ONLINE
ROLLBACK09 RBS1 SYS ONLINE
ROLLBACK10 RBS1 SYS ONLINE
ROLLBACK01 RBS1 SYS ONLINE
SQL> SELECT t1.name, t2.extents, t2.rssize, t2.optsize, t2.hwmsize, t2.xacts, t2.status FROM v$rollname t1, v$rollstat t2 WHERE t2.usn = t1.usn ;
NAME EXTENTS RSSIZE OPTSIZE HWMSIZE XACTS STATUS
SYSTEM 7 770048 770048 0 ONLINE
ROLLBACK02 2 41934848 262144000 41934848 0 ONLINE
ROLLBACK03 3 62906368 262144000 62906368 1 ONLINE
ROLLBACK04 3 62906368 262144000 62906368 0 ONLINE
ROLLBACK05 2 41934848 262144000 41934848 0 ONLINE
ROLLBACK06 3 62906368 262144000 62906368 1 ONLINE
ROLLBACK07 3 62906368 262144000 62906368 1 ONLINE
ROLLBACK08 3 62906368 300146688 62906368 0 ONLINE
ROLLBACK09 3 62906368 262144000 62906368 1 ONLINE
ROLLBACK10 3 62906368 262144000 62906368 1 ONLINE
ROLLBACK01 3 62906368 300146688 62906368 0 ONLINE
NAME0     USER0          RSSIZE Wraps Extents Shrinks     OPTSIZE     COMM0
ROLLBACK01          62906368     19     3     0 300146688 lookup
ROLLBACK02          41934848     0     2     0 262144000 lookup
ROLLBACK03 OPS$RTRADM     62906368     20     3     0 262144000 lookup 50
ROLLBACK04          62906368     34     3     0 262144000 lookup
ROLLBACK05 OPS$RTRADM     41934848     28     2     0 262144000 No Command
ROLLBACK06 OPS$RTRADM     62906368     21     3     0 262144000 lookup 50
ROLLBACK07 OPS$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
Can someone help ... who to set the RBS size here... i dont want this error happens here.. what i need to look or check.

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.

ORA-01555: snapshot too old: rollback segment number

I getting error while i am taking export one of the table.
EXP-00056: ORACLE error 1555 encountered
ORA-01555: snapshot too old: rollback segment number with name "" too small
ORA-22924: snapshot too old
Export terminated successfully with warnings.
can someone advise me

1) What version of Oracle?
2) Is UNDO_MANAGEMENT set to AUTO? Or are you still using manual undo management?
3) What is your UNDO_RETENTION? How quickly are you generating UNDO? How big is your UNDO tablespace?
4) How long does the export run?
5) Did you specify CONSISTENT=Y in the export? If so, is that necessary?
6) What else is going on? Is it possible to run the export during a quieter period?
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: 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

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

Hi,
I'm working on Oracle Database 11g Release 11.1.0.6.0 - 64bit Production With the Real Application Clusters option.
I'm exepriencing the error in the subject executing a procedure.
This procedure run at 2am, reading from a table all records written the day before:
... WHERE date_write between d1 and d1+1 ....
d1 = trunc(sysdate-1)So I suppose that the recordset cannot be changed during the execution of the procedure.
The recordset extracs more or less 10milions of records.
The procedure than read few records from another table and then insert a new record into a table (trying to delete it if already existing).
I commit every 10k records.
What I noticed is that the procedure always fails after 1 hour, that's the undo_retention value.
I tried to change the param to 2 hours, and last run failed after 2 hours...
I think I understood the ORA-01555 causes, but I thought the commit would have avoid it.
So, any suggestion?
Thanks in advance!
Samuel

What's then the logic why the commit is causing it?When you commit a transaction, involved undo blocks are "released", and they might be overwritten : if those blocks are needed for consistency, then you get ORA-01555 error.

ORA-01555: snapshot too old: rollback segment number 6 with name "R05" too

Can someone please help me how to overcome this dreaded ORA-01555 and how to know what exactly is causing this. There can be number of reasons this can occur :
1. Fewer and smaller rollback segments for a very actively changing database
2. Corrupted rollback segment
3. Fetch across commit
4. Fetch across commits with delayed block clean out
Thanks

http://asktom.oracle.com/pls/ask/f?p=4950:8:802460143396322798::NO::F4950_P8_DISPLAYID,F4950_P8_CRITERIA:275215756923
<quote source="asktom">
the only CAUSE of a 1555 is improperly sized rollback segments.
</quote>
http://asktom.oracle.com/pls/ask/f?p=4950:8:::::F4950_P8_DISPLAYID:275215756923#10100046218454
Message was edited by:
Kamal Kishore

Ora-01555, snapshot too old: rollback segment number 2 with name "_SYSSMU1

Hi,
Oracle 10g,
Im getting this error during execution of a query
Autoextend is ON for the undo datafile
There is 6 GB free space in the undo tablespace
Earlier the value for undo_retention was 18000.
I reset it using alter system set command to 25000.
But it still gives the same error
Please suggest on what could be the issue

Hi,
I got the same error twice since 2 weeks.
The DB size is 1.4TB and the TBS are as follows:
SQL> SELECT tablespace_name, retention FROM dba_tablespaces;
TABLESPACE_NAME RETENTION
SYSTEM NOT APPLY
SYSAUX NOT APPLY
PSAPUNDO NOGUARANTEE
PSAPTEMP NOT APPLY
PSAPSR3 NOT APPLY
PSAPSR3702 NOT APPLY
PSAPSR3USR NOT APPLY
7 rows selected.
the PSAUNDO tbs is 12GB.
SQL> select max(maxqueryLEN) FROM V$UNDOSTAT;
MAX(MAXQUERYLEN)
40672
SQL> show parameter undo;
NAME TYPE VALUE
inmemory_undo boolean FALSE
undo_management string AUTO
undo_retention integer 900
undo_tablespace string PSAPUNDO
Is undo_retention used only for flashback or it will improve Query, update and delete statements?
What will be the appropriate size for undo_retention?
Note that currently we are doing archiving and it is taking much of the resources in terms of rollback segments.
Please advise
Thanks,
Gavisht

ORA-01555 Snapshot too old, rollback segment too small after flashback tab

Hello
Further to an update on a table in database, I realize that I have done an error and I want to come back in the state of table before this operation.
For this I use 'Flashback table' as this command :
flashback table 'table_name' to timestamp to_timestamp('2010-11-08 08:00:00 AM','YYYY-MM-DD HH:MI:SS PM')
and I get this error :
ORA-01555 :Snapshot Too Old rollback segment N° x , "_SYSSMU9$", too small
What I can do to not have this problem ? can I avoid it ?
Please helps .
Regards
Edited by: 794982 on 12 nov. 2010 05:05
Edited by: 794982 on 12 nov. 2010 05:05
Edited by: 794982 on 12 nov. 2010 05:06

To set the undo retention period:
Do one of the following:
• Set UNDO_RETENTION in the initialization parameter file.
UNDO_RETENTION = 1800
• Change UNDO_RETENTION at any time using the ALTER SYSTEM statement:
ALTER SYSTEM SET UNDO_RETENTION = 2400;
The effect of an UNDO_RETENTION parameter change is immediate, but it can only be honored if the current undo tablespace has enough space.
For more reference.
http://download.oracle.com/docs/cd/B19306_01/server.102/b14231/undo.htm

Urgent: Error ORA-01555 "snapshot too old rollback segment too small"

I get this error when I do a "SELECT" on a few very large tables for a report. Isn't there a way out? Our DBA says our rollback segment size cannot be increased anymore. All I care of is the SELECT statement to finish executing. It is okay for me to have some inconsistency in the data (dirty reads). What is the easiest way to solve this problem? I CANNOT breakup the SELECT statement into multiple statements.
Thanks in advance

Oracle cannot be configured to give you dirty reads.
Setting your transaction to be READ ONLY probably won't help too much-- the problem here is that when you go to SELECT a particular row, Oracle discovers that the value in the row has changed since the start of your query and the old value is not present in the rollback segments.
How are your rollback segments configured? Perhaps you don't need to allocate additional space to them-- perhaps you can simply increase their OPTIMAL size.
What version of Oracle are you on? If you are on 9i or above, I would strongly consider moving to automatic UNDO management, which vastly simplifies rollback (undo) administration.
Justin
Distributed Database Consulting, Inc.
http://www.ddbcinc.com/askDDBC

ORA-01555: snapshot too old: rollback segment.... - Urgent Help required

Hello all,
I am getting this error and what I understood is I either need a bigger UNDO segment or need to increase the value of UNDO_RETENTION.
What I want to know before doing any of this is, whether I can increase the value in the UNDO_RETENTION dynamically?
Other than this I also would like to know to if there is any other way to tackle and resolve this issue?
Your help is very much appriciated.
Thanks in advance.
Himanshu

Hi,
both parameter should be tune for eliminate this error.
undo tablespace size should be large enough and retention value should at least the
length of longest query.find it from following sql.
select max(maxquerylen) from v$undostat;
Thanks
Kuljeet

Error message: snapshot too old: rollback segment number( very urgent)

Hi everybody,
I have a question regarding an oracle error message <b>snapshot too old: rollback segment number</b>.
I get this message when I run a SQL script in Oracle server. To be clear, I wrote the SQL script to extract the data from SAP R3 via Oracle server.
Could somebody please help me with this issue? It's very urgent.
The SQL statement which I use at this moment is:
set undo_management auto
set undo_retention
Please help me with this issue.
Thanks in advance.
Regards,
Esrat

it´s very uncommon to have an Oracle version higher than the client versions of the tools.
I suggest:
- Check the note mentioned now several times
- upgrade to a supported newer Oracle release
Markus

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.

ORA-01555: snapshot too old: - export- RAC

We are getting ORA-01555: snapshot too old: rollback segment number , in 3 node RAC while doing export for multiple schemas. undo rentention is set more than a day for all nodes,. undo tablespace has got enough space. Can anyone tell me what i need to look here.

hi,
can you please post below details...
oracle version,os version?
and what export command your using...
hope your using consistent =y ..while using this parameter we require big size of undo tablespace size....
refer metalink note...113450.1
thanks,
DBC,
Sr DBA,
Oracle certified expert.

Request got errror as ORA-01555: snapshot too old: rollback segment number

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