Mnemonics for Oracle SQL, PL/SQL & Apex

A collection of notes, ideas, solutions, bug fixes, best practices, thoughts and reminders, related to Oracle SQL, PL/SQL & Application Express (Apex).
I couldn't resist putting in some hobbies as well.
Navigate using the menu, the Site Map, the Search Page, or the Search field in the navigation bar.

IT became a hobby of mine around 1980, and turned into a profession in 1994. Oracle came into view around 2000.
Based in The Netherlands, I'm involved in various Oracle related projects all over the world.
After running my own company for the past few years, I now have a permanent job with Itium. More details can be found in my Curriculum Vitae.
Contact me via or LinkedIn.

Intel NUC D34010WYK

• Proxmox VE 7.4
• Container (LXC) with 2 CPUs, 3 GB RAM, 40 GB disk and AlmaLinux 8
• Oracle Database 21c Express Edition Release 21.0.0.0.0 - Production Version 21.3.0.0.0
• Apex 23.1.5 (patch 5)
• ORDS 22.1.0.r1051723
• Tomcat 9.0.62

September 2022
Time for something new: I bought a secondhand Intel NUC D34010WYK with a 250GB SSD, installed Proxmox 7.2, and moved the site to a container (LXC) with AlmaLinux on that setup. The Apache proxy server got the same treatment.
The Dell server was still working perfectly, but with the energy prices at the moment, the 50 Watts the Dell uses on average makes it an expensive option. The NUC uses just a few Watts, so that should pay for itself in less than a year.
I did try to install VMware ESXi 6.7 on the NUC and it works just fine, but it seems VMware is not too keen on this old version anymore. The 6.7 info is hard to find these days, and I could not get a second license from the site - it kept throwing errors. Too bad, but I wanted to try Proxmox anyway, so no problem.

October 2021
I moved this website back to my VMware ESXi server, after running for about 18 months on a VPS at OVH.com. That VPS worked fine, but VMs on my own server make things more flexible, and the site performs better as well.
I also changed the OS (from CentOS to Oracle Linux), and updated the XE database, Apex, ORDS and Tomcat, so it''s all brand new and shiny.
More info on my setup: database VM on VMware ESXi, and a reverse Apache proxy VM handling SSL.