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.

Tuesday, December 22, 2015

Generate "drop user" statement for schemas with and without objects

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set lines 200 col owner format a20 col username format a30 col schema format a30 PROMPT ==================================================...
Friday, December 18, 2015

How to solve ORA-27102: out of memory on startup

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You want to increase your SGA to a larger value, and you have taken care to increase the value of shmmax in the /etc/sysctl.conf file. Whe...
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How to check memory consumption and swapping on a Linux server

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The easiest way to check for memory consumption on Linux is in my opinion the "free" utility: oracle@prodserver1:[proddb01]# fre...
Wednesday, December 16, 2015

How to resolve PLS-00201: identifier 'DBMS_SYSTEM.SET_BOOL_PARAM_IN_SESSION'

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During migration of an EBS (E-Business Suite) database, I was left with some packages in the APPS schema that couldn't be compiled. SQ...
Sunday, December 13, 2015

Cardinality, Selectivity, Projection and Selection - definitions

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From Oracle documentation : Cardinality The ratio of distinct values to the number of table rows. A column with only two distinct values...
Friday, December 11, 2015

Preparations to make before running dbms_redefinition on a large table

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To avoid ORA-01555 "snapshot too old", you should take the following precaution before starting an online redefinition of a larg...
Friday, December 4, 2015

How to enable OLAP in an Oracle 11gR2 database

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First, check that the prerequisites are fulfilled. The components below must be installed and valid before proceeding. select comp_id, com...
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About Me

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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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