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OCP Instructors Guide for Oracle DBA Certification

Chapter 5 - Oracle Database Objects

Rollback Segments and Users – Who’s Using What?

The output from the query below will tell you what rollback segment a user is using.  The output provides the rollback segment name, Oracle account and operating system account. This is a good statement to use when an active transaction is preventing a rollback segment from being taken offline or shrinking back to its optimal size.

select osuser o, username u, segment_name s, substr(sa.sql_text,1,200) txt
from v$session s, v$transaction t, dba_rollback_segs r, v$sqlarea sa
SEE CODE DEPOT FOR FULL SCRIPT

The statement provides the OS user account, Oracle account, the rollback (or undo) segment name and the statement that is currently executing.

Oracle9i - Database Managed Undo Segments

You don’t have to be an Oracle expert to know that rollback segments can be "somewhat troublesome." Out of space conditions, contention, poor performance and the perennial favorite "snap shot too old" errors have been plaguing Oracle database administrators for over a decade. Oracle finally decided that the database could probably do a better job of managing before images of data than we could.
 


The above text is an excerpt from:


OCP Instructors Guide for Oracle DBA Certification
A Study Guide to Advanced Oracle Certified Professional Database
Administration Techniques

ISBN 0-9744355-3-8

by Christopher T. Foot
 

http://www.rampant-books.com/book_2003_2_OCP_print.htm


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