MacLochlainns Weblog

Intriguing little PostgreSQL PL/pgSQL test question posed by an interviewer of one of my students. Basically, how many times will this loop and what will it return or will it generate an error. (BTW, they wrapped it into a named function.)

DO
$$
BEGIN
  FOR i IN 0.2..1.5 LOOP
    RAISE NOTICE '%', i;
  END LOOP;
END;
$$;

It’ll loop three times and return 0, 1, and 2 because the double numbers entered as boundaries to the for-loop are implicitly case as integers.

Installing Parallels on my iStudio (M2) was straightforward because I let it install Windows 11. Then, when I wanted to install Ubuntu it wasn’t quite that easy. You just need to understand that you click the Parallels’ Window menu option and Control Center option.

The Control Center option provides the following dialog.

Click the + symbol to create a new virtualization and you get the following dialog; and choose the Download Ubuntu with x86_64 emulation if you want to install a Docker image that’s not ported to ARM, like the Oracle Database 19c.

It’ll then explain in this dialog that is uses Apple’s Rosetta 2 technology, which means you should be able to install an Intel architecture Docker image with Oracle Database 23c.

As always, I hope this helps those trying to sort out how to leverage a new stack.

Contrary to the instructions, you should do the following as a sudoer user:

sudo apt install -y docker.io

Install all dependency packages using the following command:

sudo snap install docker

You should see the following:

docker 20.10.24 from Canonical✓ installed

You can verify the Docker install with the following command:

sudo docker --version

It should show something like this:

Docker version 24.0.5, build 24.0.5-0ubuntu1~22.04.1

You can check the pulled containers with the following command but at this point there should be no pulled containers.

sudo docker images

At this point, a docker group already exists but you need to add your user to the docker group with the following command:

sudo usermod -aG docker $USER

Using the Docker Commands:

• To activate the logging, utilize the -f parameter.
• To divide JSON, use Docker by default; to extract individual keys, use JQ.
• In your Container file, there are quite a few areas where commands may be specified.
• Posting to the volumes could be more effective while the picture is being built.
• Docker offers a highly efficient way to create an alias for its own built-in commands. This makes it easier to set up and handle lengthy and enormous orders. These alias values are stored in the directories /.bashrc or and /.bash_aliases.
• Docker offers further assistance to remove unused code fragments from the installation of the container.
• Docker always favors reading statements from the container file that have not changed. Therefore, time savings may be realized by arranging what is shown in the container file in a way that ensures the elements that are susceptible to change are shown towards the end of the document and those that are most likely to undergo change are shown at the top.

As always, I hope this helps.