Duplication of Oracle database on same node/cluster with skip of tablespaces
In this blog post I want to write about a typical restore scenario. You need to restore a database to a historical point in time to investigate some former data or maybe even rescue some data, but need to leave the source database intact. So…
Star Schema Design in Oracle: Fundamentals
What are the design rules for good performance in a star schema in an Oracle database? This blog post series introduces some recommendations for the physical database design. This first post is about constraints and indexes. For the last few years, I was supporting one…
optimizer_secure_view_merging and plsql_declarations
The Original Problem A customer is currently upgrading some Oracle databases from 11.2 to 19c. One query was extremely slow on the new test system and my job was to find out why. The root cause was that the database parameter optimizer_secure_view_merging was set to…
Bye Bye Trivadis
Today is my last day at Trivadis. I worked for this company more than 23 years, and most of the time, I loved my job. To conclude my time as a consultant and trainer, here are three funny stories that happened to me over the years….
Quoted Identifiers #JoelKallmanDay
Background and TL;DR Connor McDonald wrote a blog post named Cleaner DDL than DBMS_METADATA. Back then he asked me if it would be possible to let the formatter remove unnecessary double quotes from quoted identifiers. Yes, of course. Actually, the current version of the PL/SQL…
DOAG2022 Highlights
Nobody knows what kind of restrictions we will experience later this year. That’s why the DOAG Conference + Exhibition 2022 took place in September instead of November. The organizers wanted an in-person event. While you can access some chosen content remotely an in-person event has…
Book Review: “Faster: How to Optimize a System” by Cary Millsap
There are many books on performance optimization, but this one differs in a few ways. It is more of an entertaining collection of short stories, but with many educational messages. My travel plans for the Kscope22 conference in June this year were suboptimal: My return…
Deleting Rows With Merge
The merge statement allows you to insert, update and delete rows in the target table in one go. This is great. However, the delete part does not work as expected. Is it a bug? No, it works exactly as documented. Nonetheless, I was not aware…
Testing With utPLSQL – Made Easy With SQL Developer
Nowadays, everything is about automation. Software testing is no exception. After an introduction, we will create and run utPLSQL tests with Oracle SQL Developer for a fictitious user story. Our tests will cover a PL/SQL package, a virtual column, two database triggers and a view….
plscope-utils for SQL Developer 1.0 – What’s New?
Introduction PL/Scope is an SDK for source code analysis. It is available since Oracle Database 11g Release 1 and has been significantly improved in 12c Release 2. plscope-utils for SQL Developer is a SQL Developer extension that simplifies the compilation with PL/Scope, visualizes PL/Scope information…