Solution

Pitfall: ORA-1843 – NOT A VALID MONTH in Oracle 19.4 – 19.8

Today, I’d like to write about a tiny little issue – which can cause some real trouble in Oracle 19c. This blog post is about the Pitfall: ORA-1843 – NOT A VALID MONTH in Oracle 19.4 – 19.8.

The Testcase

My testcase is super-simple – and you can reproduce it even without any object in 2 seconds (one for “copy“, the other for “paste“). Simply execute this query:

select to_date('20191120','RRMMDD') from dual;

Or this one where I replace “RR” with the more common “YY”:

select to_date('20191120','YYMMDD') from dual;
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AutoUpgrade may fail when patch ID column is NULL

Monday morning – it’s time to write a new blog post. And actually I will set priorities based on what you reported to me in the past week. This way it may prevent others from hitting the same pitfall. The AutoUpgrade may fail when patch ID column is NULL in REGISTRY$HISTORY.

AutoUpgrade may fail when patch ID column is NULL

Photo by Etienne Boulanger on Unsplash

What is happening?

You start a database upgrade with autoupgrade. But the initial check will fail with a message like this:

AutoUpgrade tool launched with default options
There was an error initializing the patching information for entry upg2

The AutoUpgrade won’t kick …

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VBox 5.0.10/12 issues with PERL and Seg Faults – UPDATE

A bit more than two months ago I did hear from several people having issues with our Hands-On Lab environment. And it became clear that only those who use Oracle Virtual Box 5 see such errors.

Then I read Danny Bryant‘s blog post (thanks to Deiby Gomez for pointing me to it) about similar issues and a potential solution yesterday:

And interestingly one of my colleagues, our PL/SQL product manager Bryn Llewellyn started an email thread and a test internally yesterday as well.

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