Minimalistic Oracle

Minimalistic Oracle contains a collection of practical examples from my encounters with Oracle technologies. When relevant, I also write about other technologies, like Linux or PostgreSQL. Many of the posts starts with "how to" since they derive directly from my own personal experience. My goal is to provide simple examples, so that they can be easily adapted to other situations.

Showing posts with label UNDO management. Show all posts

Tuesday, January 29, 2019

The difference between REDO and UNDO

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UNDO REDO Used during normal database operations Used during instance and media recovery only Contains changed column values Conta...

Thursday, October 19, 2017

How to monitor rollback activity after killing long-running session

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Found this brilliant script here: http://www.oracle-wiki.net/startsqlshowrollinfo prompt This query will monitor rollbacks of transactio...

Tuesday, August 9, 2016

How to check for active usage of an UNDO tablespace

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SELECT a.name,n.status FROM v$rollname a inner join v$rollstat n USING(usn) WHERE a.name IN ( SELECT segment_name ...

Friday, October 30, 2015

Syntax for setting the default undo tablespace for the instance

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ALTER SYSTEM SET undo_tablespace='APPS_UNDOTS1' SCOPE=BOTH;

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About Me

Name: Vegard Kåsa: My career as an Oracle DBA startet in 2001, when I acceptet a request to take on the responsibility as my current employer's DBA. From that point and onwards, managing Oracle databases has kept me busy and engaged. I enjoy my work, and particulary appreciate the constant learning and devlopment that comes with the job. From 2014, I am self-employed through my company Oric Consulting AS (Norway), and from 2024 Oric Consulting AB (Sweden) I currently live in Göteborg, Sweden, with my family.

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