Video : SQLCL and Liquibase : Deploying Oracle Application Express (APEX) Applications

In today’s video we’ll give a quick demonstration of deploying an APEX application using the SQLcl implementation of Liquibase.

I Know what you’re thinking. Didn’t I do this video two weeks ago? The answer is yes and no. This video is very similar to the Liquibase video I did two weeks ago, but that was using the Liquibase Pro client. This video uses the SQLcl implementation of Liquibase, and more specifically the runOracleScript tag to achieve the same thing.

The video is based on this article, which has an example of deploying an APEX workspace and an APEX application.

If you are new to Liquibase and SQLcl, you might find it easier to start with these.

The stars of today’s video are the offspring of Jeff Smith. I had been annoying Jeff on Twitter DMs while he was meant to be on holiday, so I agreed to pay him back by turning his children into international megastars. I take no responsibility for how they handle the fame! 😉

Cheers

Tim…

20 Years of ORACLE-BASE.com

It was twenty years ago today that the first incarnation of my website was born.

It started life as a few scripts and notes put on the internet so I didn’t have to carry them around on floppy disks or CDs when I was moving around between contracts. I had been working with Oracle technologies for five years before the website was born, but most of the early content was Oracle 8i stuff.

I added new articles now and then, but I guess it really started to take off when I was preparing for the Oracle 9i OCP upgrade exam. For the 7.3, 8 and 8i OCP exams I used books to prepare, but for 9i OCP I decided to do the beta exam. This meant there were no books available yet, so I had to do it the hard way. I wrote my own revision notes for the whole of the syllabus and put them on the website. They got pretty popular, as free things often do. 🙂 From that point on I just kept adding articles on a regular basis.

Over the last 20 years the site has gone through lots of changes, but also stayed reassuringly the same. It takes a lot of work to keep producing new articles, but what most people don’t see is the amount of time that is taken up reworking some of the old articles. Some of this stuff was written 20 years ago and I come back to things and want to hang my head in shame. Someone will ask a question about an article, I will read it, hate it and rework it. It’s a never ending job, and the more you write, the more you have to refactor down the line. 🙂

Thanks to everyone who has supported me over the last 20 years. It’s not over yet.

Cheers

Tim…

Video : Hybrid Partitioned Tables in Oracle Database 19c

In today’s video we’ll give a quick demonstration of Hybrid Partitioned Tables, introduced in Oracle Database 19c.

The video is based on this 19c article.

The video only has a single example using external partitions pointing to CSV data. The article also includes and example using a Data Pump file.

The star of today’s video is Oren Nakdimon, who was taking a day off from being a God of Edition-Based Redefinition. 🙂

Cheers

Tim…

Video : Liquibase : Deploying Oracle Application Express (APEX) Applications

Today’s video is a quick demonstration of deploying an Oracle Application Express (APEX) application using Liquibase.

The video is based on a new article of the same name, which covers the deployment of both APEX workspaces and APEX applications using Liquibase.

Here’s some other content you might find useful.

The star of today’s video is Jorge Rimblas, making a welcome return to the channel, along with some serious reverb. 🙂 Last time we saw Jorge was in a boxing gym, and his daughters have also taken the spotlight for one video.

Cheers

Tim…

Video : APEX_DATA_PARSER : Convert simple CSV, JSON, XML and XLSX data to rows and columns

Today’s video is a quick demonstration of using the APEX_DATA_PARSER package to convert simple CSV, JSON, XML and XLSX data into rows and columns.

If you want the copy/paste examples and the test files, you can get them from this article.

Yet another reason why you should always install APEX in your databases.

The star of today’s video is Kosseila.HD, also known as BrokeDBA, complete with sun glasses, basket ball and a rattling watch. 🙂

Cheers

Tim…

Video : Podman : Generate and Play Kubernetes YAML Files

Today’s video demonstrates Podman’s ability to generate and play Kubernetes YAML files.

This is based on the following article.

You can might want to check out these also.

The star of today’s video is Max McDonald, son of Connor McDonald.

Cheers

Tim…

Video : Using Podman With Existing Dockerfiles (Oracle Database and ORDS)

Today’s video shows me using some of my existing Docker builds with Podman. Specifically a 19c database container and an Oracle REST Data Services (ORDS) container.

For those with an understanding of Docker, it should look really familiar, but it does introduce a twist in the form of a pod.

The video is based on this article.

You can see more information about containers here.

The star of today’s video is Bart Sjerps. It was really hard to find a piece of this recording that didn’t have James Morle wittering over everyone on it. 🙂

Cheers

Tim…

Video : Install Podman on Oracle Linux 8 (OL8)

In today’s video we’ll take a look at installing Podman on Oracle Linux 8 (OL8).

This is based on the article here.

You can see more information about containers here.

The star of today’s video is John King. John’s been on the channel a couple of times before. Once to do a message to one of his super-fans, a work colleague of mine who was impressed that I know John, and once for a regular “.com” appearance. I blame the wife for the terrible audio. 🙂

Cheers

Tim…

Oracle Database 19c RAC On OL8 Using Vagrant

On Sunday 17th May I started the process of putting together a Vagrant build of Oracle 19c RAC on Oracle Linux 8 (OL8.2 + EUK). I figured it would take me about 20 minutes to amend my existing OL7 build, but it took the whole of that Sunday, every evening for the following week, and the whole of the following Saturday and Sunday to complete it. There were some late nights, so from an hours perspective it well over 5 days of work. Most of that time would have been completely unnecessary if I wasn’t an idiot.

First things first. The result of that effort was this build on GitHub, with an associated article on my website describing the build in more detail.

For the remainder of this post I want to describe the comedy of errors that went into this creation. These problems were not indicative of issues with the software. These problems were totally down to me being an idiot.

Changes when using OL8

The vast majority of the build remains the same, but there was one change that was necessary when moving to from OL7 to OL8. This became evident pretty quickly. When configuring shared disks and UDEV, I switched from using partprobe to partx. It did look like partprobe was working, but it chucked out loads of errors, and partx didn’t. I found out about this from Uncle Google.

There was also a slight difference in getting the UUID of a regular VirtualBox disk in OL8, but I had already noticed that on single instance builds, so that wasn’t a problem.

Where it all started to go wrong

So with those minor changes in place, all the prerequisites built fine and I was ready to start the Grid Infrastructure (GI) installation. I try to do these builds using the stock releases, so people without Oracle Support contracts can try them. In this case that meant using the 19.3 software. This really marked the point where it all started to go wrong. I knew this build was only certified on 19.7, but I continued anyway…

None of the 19.3 installers recognised OL8, so I had to fake the Linux distribution using the following environment variable.

export CV_ASSUME_DISTID=OEL7.6

The 19.3 GI software refused to install, saying there was a problem with passwordless SSH connectivity. I tested it and it all looked good to me. I searched for solutions to this on Google and MOS, checking out everything I could find that seemed relevant. None of the solutions helped.

For the hell of it I tried on older releases of OL8. I had the same issue with OL8.1, but OL8.0 worked fine. I figured this was something to do OpenSSL or the SSH config, so I searched for more MOS notes and tried everything I could find. After a very long time I reached out to Simon Coter, who came back with an unpublished note (Doc ID 2555697.1), which included a workaround. That solved my problem for the 19.3 GI installation on OL8.2.

The GI configuration step and the DB software-only installation went fine, as they had done on OL8.0 also. Unfortunately the DBCA was failing to create a database, producing errors about passwordless SSH problems. The previous fix wasn’t helping, and I tried every variation I could find, short of totally downgrading OpenSSL.

At this point I pinged Markus Michalewicz a message, hoping he would be my salvation. In short he confirmed the build did work fine on OL8.2 if I used the 19.7 software, so the writing was on the wall. Then I stumbled on a MOS note (Doc ID 29529394.8) that explained the DBCA problem on OL8. There was no workaround, and it said it was fixed in 19.7. There is always a workaround, even if it means hacking the Linux distribution to death, but the more you do that the less realistic your build is, so at that point I conceded that it was not sensible to continue with the 19.3.

When I write it down like this it doesn’t seem like a lot, but all this took a long time. I was trying different Vagrant boxes, and eventually built some of my own for OL8.0 and OL8.2, to make sure I knew exactly what was on them. Added to that, many of the tests required full rebuilds, so I was waiting sometimes in excess of an hour to to see a success/fail message on the next test. It was soul destroying, and I nearly gave up a few times during the week.

A New Hope

Once I decided to go with the 19.7 patch things moved pretty quickly. I had the 19.3 GI installed and configured and the 19.3 DB software installed, so I added in a script to patch the lot to 19.7, and the database creation worked fine. Job done.

I cleaned things up a bit, pushed it to GitHub and put together the longer description of the build in the form of an article (see links above).

Pretty soon after I put all this live I got a comment from Abdellatif AG asking why I didn’t just use the “-applyRU” parameter in the Grid and DB software installations to apply the patches as part of the installation. At this point I felt a mix of emotions. I was kind of frustrated with myself for wasting so much time trying to get 19.3 working in the first place, then annoyed at myself for being so blinkered by the existing build I hadn’t seen the obvious solution regarding the patching. Why build it all then patch it, when you can do it right first time?

The conversion of the build to use the “-applyRU” parameter with the runInstaller and gridSetup.sh calls was really quick, but the testing took a long time, because these builds take in excess of 90 minutes each try. Things pretty much worked first time.

Now that I was effectively using 19.7 software out of the gate I figured many of the tweaks I had put in place when using the 19.3 software were no longer needed. I started to remove these tweaks and everything was good. By the end of that process I was pretty much left with the OL7-type build I started with. The vast majority of my time over the last week has been unnecessary…

Conclusion

The 19c (19.7) RAC build on OL8.2+UEK6 is pretty straight forward and works without any drama.

This process has shown me how stubborn and blinkered I can be at times. Taking a step back and getting a fresh perspective would have saved me a lot of time in the long run.

Thanks to Simon Coter, Markus Michalewicz and Abdellatif AG who all witnessed my descent into madness.

Cheers

Tim…

PS. There are some extra notes at the end of the article, which include some of the MOS notes I tried along the way. They are unnecessary for the build, but I felt like I should record them.

PPS. The image is how I feel at the end of this process.