How To Check / Find Size Of Current ROLLBACK Segment
Apr 8, 2013How to check/find the size of current ROLLBACK segment in oracle 10g ?
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Rollback Segment Number 2 With Name _SYSSMU2$ Too Small
Nov 3, 2010While taking backup of schema using Expdp, I got the following error on one of the tables in the schema due to which export for this table could not be done.
Re: ORA-01555: snapshot too old: rollback segment number 2 with name "_SYSSMU2$" too small.
Undo retention time is 14400 sec and Undo Tablespace is Auto Extensible. Table to be exported contains 100 crore rows.
Server Administration :: Rollback Segment Too Small ORA-01555
Jan 19, 2012One of the users received the error
ora-01555: rollback segment too small
I have read about the error and saw that it is caused by transactions made upon same data, filling to maximum one of the UNDOTBS rollback segments.It happens only once in a while, each time on a different Rollback Segment.
I've read that i should do a few things to enlarge those segments, such as bring a 1. segment offline, 2. drop it and then 3. create it with a bigger size & possibly a bigger extent setting
i've also read that those actions aren't relevant if you have the parameter UNDO_MANAGEMENT set on AUTO, which is actually the case.is that why when i execute ALTER ROLLBACK SEGMENT RB_SEG_NAME_11$ OFFLINE;
1. How do i solve my issue with the Rollback segment being too small to contain the snapshot with the requested SCN?
2. what does the parameter UNDO_MANAGEMENT mean? should i change it, in order to adjust my Rollback Segments attributes, to prevent my error of re-occurring?
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Dec 28, 2011I am working to understand the space allocation of table with the value we provided with the data type. For that I have created a table with varchar2 and length 50. Size of table created is of 65536 Bytes. This is when we don't have any insertion in the table. Later when we insert some rows, total size if the segment still remain same that is 65536 bytes.
Now again when I created table with varchar2 and length this time is 500 but still it is created with same size that is 65536. So can you just explain, on what values segment size depends on and how the length effect the size & space allocation.
db_block_size is 8192.
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Apr 13, 2004I have two tables
table_1
--Emp_id--|--Sup_id--|Sup_name|--Date--|
-------------------------------------------------
--00001--|--00005 --|---ABCD--|01-MARCH-2004
--00002--|--00006 --|---BCDE--|02-MARCH-2004
--00003--|--00007 --|---CDEF--|03-MARCH-2004
--00001--|--00008 --|---DEFG--|04-APRIL-2004
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table_2
--Emp_id--|Emp_name|
--------------------------------
--00001--|--QWER--|
--00002--|--ASDF--|
--00003--|--ZXCV--|
--00004--|--POIU--|
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As some employee(00001 & 00003) have a different supervisor from different date, I'll like to extract from table_1 the record of each employee in the table that only contain the supervisor info on the most recent date.And from table_2, i'll like to extract the employee's name. These records extracted from both the tables would the be put into a new table,table_3
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table_3
Emp_id|Emp_name|Sup_id|Sup_name|Date|
------------------------------------------------
00001 |--QWER--|00008 |--DEFG---|04-APRIL-2004
00002 |--ASDF-- |00006 |--BCDE---|02-MARCH-2004
00003 |--ZXCV-- |00009 |--EFGH---|05-APRIL-2004
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- So HOW do I find the total size occupied by this table. Does BINARY storage work as LOB storage. i.e. I need to consider USER_LOBS as well for this. OR foll. will work
select segment_name as tablename, sum(bytes/ (1024 * 1024 * 1024 )) as tablesize_in_GB
From dba_segments
where segment_name = 'XML_TABLE_1'
and OWNER = 'SCHEMANAME'
group by segment_name ;
- Also if I am copying it to another table of same structure as:
Insert /*+ append */ into XML_TABLE_2 Select * from XML_TABLE_1.
Then how much space in ROllbackSegment do I need. Is it equal to the size of the table XML_TABLE_1?
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----------- ------------ ------------------------------------------------- -------------------------------------------------
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