A single transaction allows multiple segments of cancellation?

Hi all

> > It is true. I hope

Automatic cancellation management trying to get a single transaction by rollback segment.

> > System allocated undo segments in my db

SYS > select tablespace_name, nom_segment, segment_type in dba_segments where nom_tablespace = 'UNDOTBS1;

NOM_TABLESPACE NOM_SEGMENT SEGMENT_TYPE

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

UNDOTBS1 _SYSSMU20_3456939673$ TYPE2 UNDO

UNDOTBS1 _SYSSMU10_1587870235$ TYPE2 UNDO

UNDOTBS1 _SYSSMU9_3125699220$ TYPE2 UNDO

UNDOTBS1 _SYSSMU8_1650894436$ TYPE2 UNDO

UNDOTBS1 _SYSSMU7_1674198302$ TYPE2 UNDO

UNDOTBS1 _SYSSMU6_2857852067$ TYPE2 UNDO

UNDOTBS1 _SYSSMU5_4189375384$ TYPE2 UNDO

UNDOTBS1 _SYSSMU4_1056436449$ TYPE2 UNDO

UNDOTBS1 _SYSSMU3_2901871043$ TYPE2 UNDO

UNDOTBS1 _SYSSMU2_3126160280$ TYPE2 UNDO

10 selected lines.

SYS > select a.usn, a.xacts, b.name from v$ rollstat a, v$ rollname b where a.xacts! = 0 ;

no selected line

> > I did the update unique transaction

SQL > update statement... (it updates only 16 records)

QUERY 1:

========

SYS > select * from v$ rollstat where XACT = 1;

USN LATCH TRACTS WRITTEN XACT GETS LOOKS OPTSIZE HWMSIZE RSSIZE NARROWS WRAPS EXTENDS AVESHRINK AVEACTIVE STATUS CURBLK CUREXT

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

5 0 70 92463104 240604 1 623 0 92463104 0 0 0 0 0 67 691 online

QUERY 2:

========

SYS > select a.usn, a.xacts, b.name from v$ rollstat a, v$ rollname b where a.xacts! = 0 ;

THE NAME OF THE XACT USN

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

5 1 SYSTEM

5 1 _SYSSMU2_3126160280$

5 1 _SYSSMU3_2901871043$

5 1 _SYSSMU4_1056436449$

5 1 _SYSSMU5_4189375384$

5 1 _SYSSMU6_2857852067$

5 1 _SYSSMU7_1674198302$

5 1 _SYSSMU8_1650894436$

5 1 _SYSSMU9_3125699220$

5 1 _SYSSMU10_1587870235$

5 1 _SYSSMU20_3456939673$

11 selected lines.

I did single GST,


QUERY 1

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

Select * from v$ rollstat where XACT = 1;

Query, say--> 1 transaction is 1 segment undo i.e.  XACT = 1

the transaction is used segment uno number 5


QUERY 2:

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

but the query 2 poster

Select a.usn, a.xacts, b.name from v$ rollstat a, v$ rollname b where a.xacts! = 0 ;

undo_segment 5 is used all of undotbs1 undo_segments.

Select a.usn, a.xacts, b.name

v $ rollstat a, v$ rollname b

where a.usn = b.usn

and a.xacts! = 0 ;

Tags: Database

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