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 client connections. Show all posts
Showing posts with label client connections. Show all posts
Thursday, June 5, 2025

How to limit connections in a postgres database

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This is how you can restrict connections for a specific database to zero: postgres=# alter database db01 connection limit 0; ALTER DATABA...
Tuesday, March 29, 2022

How to connect via sqlplus with the connect string

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To connect as sys using the entire connect string, use the following syntax: sqlplus /nolog SQL>connect sys@'(DESCRIPTION=(ADDRESS...
Wednesday, May 22, 2019

Deprecated security parameter in Oracle 12c: SEC_CASE_SENSITIVE_LOGON

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Oracle states: "The use of the Oracle instance initialization parameter SEC_CASE_SENSITIVE_LOGON is deprecated in favor of setting t...
Friday, September 30, 2016

Missing trailing slash in listener.ora caused ORA-27101 when attempting to connect

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Not too long ago, I got an error when connecting to my database using TOAD: ORA-01034: ORACLE not available ORA-27101: shared memory realm ...
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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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