Flaws and Pitfalls

Messaging Gateway – Upgrade can’t find mgwu122.sql

Thanks to Christian Ballweg from Optiz Consulting who brought this issue to my attention. I haven’t seen it before since I haven’t installed it but you may encounter this if you have the Messaging Gateway – Upgrade can’t find mgwu122.sql.

What is the Messaging Gateway?

Actually I steal this from the documentation:

Messaging Gateway enables communication between applications based on non-Oracle messaging systems and Oracle Database Advanced Queuing.

Oracle Database Advanced Queuing provides propagation between two Oracle Database Advanced Queuing queues to enable e-business (HTTP through IDAP). Messaging Gateway extends

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Oracle 19c on Windows may flood your trace file directory

Oh … it’s Windows week here. And all this even though since I didn’t install Oracle on Windows for quite a while. But of course I’m fully aware that many of you out there operate Oracle on Windows. In this particular case thanks to Joël for the pointer to this issue. Oracle 19c on Windows may flood your trace file directory.

What happens?

In every release of Oracle 19c, at least until 19.10.0 BP, you may find out that every few minutes a trace file gets written into the %ORACLE_BASE%\diag\..\..\trace directory. And all …

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ORA-12638 on Windows only from Oracle 19.10.0 onwards

You like unexpected changes and surprises, don’t you? And especially those which aren’t in the patch notes or the docs. I blogged about such changes a few weeks ago. And thanks to the people reading this blog, I learned now about another change with Oracle 19.10.0 on the Windows platform. You may receive now an ORA-12638 on Windows only from Oracle 19.10.0 onwards.

What has been changed?

So at first, thanks to Ernst and Marcus for bringing this to my attention. This is an issue which happens on MS Windows only.

When you …

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Workaround for sdoloadj.sql errors with Datapatch in 19.9.0 and 19.10.0

The other week a customer from my hometown alerted me about an issue they saw when applying the 19.9.0 RU. A long sequence of errors in the datapatch run, all of them signaled from sdoloadj.sql. They opened an SR. And Support had an – understandable – recommendation the customer didn’t want to implement: Install JAVAVM. But thanks to my PM mate, Hans Viehmann (Mr Spatial), here is a simple Workaround for sdoloadj.sql errors with Datapatch in 19.9.0 and 19.10.0. And it may even apply to later releases, too.

What happens?

Take …

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Why is there a lib32 directory in Oracle 19.8.0 and 19.9.0?

I received two emails from different customers within a week – and both asked the same thing: Why is there a lib32 directory in Oracle 19.8.0 and 19.9.0? In one case, it was more like “We are wondering” but in the other case it caused issues during patching.

Why is there a lib32 directory in Oracle 19.8.0 and 19.9.0?

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What happens?

Due to a packaging issue most likely, there is a lib32 directory appearing after you patch your homes to either 19.8.0 or 19.9.0. With the next RU, 19.10.0, this should not be the case anymore.

Why does this sound strage?

The first customer who …

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Apply Patch 31088341 before Upgrade to prevent ORA-1403

As I learned from a customer this week, this patch is a must have when you use Partitioning and you attempt to upgrade to Oracle 19.9.0 or earlier. So please apply patch 31088341 before Upgrade to prevent ORA-1403 happening.

Apply Patch 31088341 before Upgrade to prevent ORA-1403

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What is the issue?

This applies to all 19c upgrades at least until 19.9.0.

The fix is included from 19.10.0 Release Update onward. So if you are upgrading to 19.10.0 or higher, you can stop reading here (thanks Pablo for the hint!).

You may see this error pattern in catupgrd0.log:

==Error from catupgrd0.log===

=================================================================
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Fixed Objects Stats Gathering Fails – what do you do now?

A few days ago I blogged about what you could do when Fixed Objects Stats Gathering is slow in an upgrade process. You can skip the preupgrade gathering, and the postupgrade gathering does not happen anymore since the October 2020 version of AutoUpgrade. Still, I came across another issue the other day: Fixed Objects Stats Gathering Fails – what do you do now?

What happened?

Actually this is connected to the Fixed Objects Stats Gathering is slow in an upgrade case. The customer encountered an incredible long runtime. And the support engineer …

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ORA-29702 – and your instance does not startup in the cluster anymore

This is the right blog post for a Friday 13th. And please forgive me – I wanted to put this on the blog earlier as two of my customers hit this weeks ago already. But it must have fallen through the cracks. Still, now it is hopefully not too late to tell you what you should do if you hit ORA-29702 – and your instance does not startup in the cluster anymore. Especially when you tested a database upgrade – and after a restore, the database doesn’t want to start, no matter what you try.

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Solution for ORA-02303 from JSON_OBJECT_INVALID in upgrade to 19c

I just learned yesterday about this error – and as it seems to happen occasionally, you may want to read more about the Solution for ORA-02303 from JSON_OBJECT_INVALID in upgrade to 19c.

What happens?

You are upgrading a database to Oracle 19c, and you see this error pattern:

CREATE OR REPLACE TYPE JSON_Object_T AUTHID CURRENT_USER UNDER JSON_Element_T(
*
ERROR at line 1:
ORA-02303: cannot drop or replace a type with type or table dependents

This is coming when catjson.sql gets executed.

Why does it happen?

Unfortunately the FORCE option is missing when we create …

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Receiving ORA-55940: An error occurred during execution of ktliIngestExternData

During my previous test with Unified Auditing Policies anomalies after upgrade to Oracle 19c, I also hit and error when I queried the unified audit trail. Hence, I make a reminder to myself and would like explain what to do in case you are Receiving ORA-55940: An error occurred during execution of ktliIngestExternData as well.

What a strange error

I created a few policies by myself and did a database upgrade from Oracle 12.2.0.1 to Oracle 19.8.0. And after upgrade, I wanted to check the records in my audit trail. But instead of …

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Check your Unified Auditing Policies after upgrading to Oracle 19c

This may become a longer blog post. One of the customers I work with for many years contacted me a few weeks ago. After upgrade to 19c, it looked like as if some Unified Auditing Policies weren’t correct anymore. It started as a tiny issue, but thanks to the customer who analyzed down to the bones, it seems to be bigger than we thought at the beginning. So you may Check your Unified Auditing Policies after upgrading to Oracle 19c as well.

Check your Unified Auditing Policies after upgrading to Oracle 19c

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Unified Auditing

Actually a lot of my customers use Unified Auditing these …

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When Fixed Object Stats Gathering takes very long during upgrade …

Over the past days I exchanged several emails with a very important customer regarding Fixed Objects Stats gathering in relation to database upgrade. The customer found out that it takes very long in their environment – over an hour to be precise. Relaxing on the weekend helped me a bit. And this morning, it dawned me that I’ve had two similar cases before already. Plus I didn’t blog about it yet. Now it’s time to tell you a little but about Unified Auditing and the situation when Fixed Object Stats Gathering takes very long during upgrade …

When Fixed Object Stats Gathering takes very long during upgrade ...

Photo by Ayse

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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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MGA Issue – and it is fixed with Oracle 19.8.0 and newer

Where do I start? One of the customer accounts I worked the longest time with recently upgraded to Oracle 19c on Exadata. They are an Exadata customer since 2009. After going live on 19c, a few days later they hit an MGA Issue – and it is fixed with Oracle 19.8.0 and newer. But question no.1 was: Why hasn’t Oracle warned us – and how could we have learned about it?

MGA Issue - and it is fixed with Oracle 19.8.0 and newer

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What is the MGA?

OK, I have heard of SGA and PGA. But MGA? The first two hits when I search with …

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AutoUpgrade and the Partial Offline Backup Strategy

In our Fallback talk we promote a backup strategy for large DWHs and database which are on purpose in NOARCHIVELOG mode. But last week I learned that there is something important to know about AutoUpgrade and the Partial Offline Backup Strategy. Otherwise you may hit a

AutoUpgrade and the Partial Offline Backup Strategy

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pitfall.

 

Partial Offline Backup Strategy?

I won’t explain in all details what this is. If you’d like to read more, please find all the necessary information on my blog post from July 17, 2018:

with graphics included. In brief, you take …

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Windows Only: Upgrade to Oracle 18.10.0 fails with ORA-01722

Liron Amitzi reported this on his blog a few days ago already. And it is a very nasty tiny little issue happening with RUs where the second number of the release enters the two-digit-space, such as 18.10.0. At this point, on Windows Only: Upgrade to Oracle 18.10.0 fails with ORA-01722. This happens late in the upgrade phase.

What is the issue?

The problem here is a tiny little piece in %ORACLE_HOME\admin\catupstr.sql – a SUBSTR function is used in a way that it does not take into account a potential two-digit …

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Special characters show junk in CLOB columns after upgrade to Oracle 19.7.0 with JDBC

When you’d copy & paste the above title into a search engine, you may come across a very similar sounding blog post I wrote two years ago. Today, my dear colleague Dirk asked me on behalf of a customer if it’s possible that this bug is back in 19.7.0. Of course, I said “No”, for sure not. Bug 26380097 was fixed in Oracle 18c already. Gladly, Dirk insisted. So I checked the SR his customer opened.

And now I can write an unplanned blog post about Special characters show junk in CLOB columns

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OJVM datapatch fails with ORA-29532 – but the root cause is noncdb_to_pdb.sql

Kudos to Robert Ortel who brought this nice misbehavior to my attention. And even though it looks like this would be an OJVM issue, it is caused by noncdb_to_pdb,sql, the script which is used to convert a non-CDB to a PDB. When you apply an OJVM patch, OJVM datapatch fails with ORA-29532 – but the root cause is noncdb_to_pdb.sql.

OJVM datapatch fails with ORA-29532 - but the root cause is noncdb_to_pdb.sql

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It’s a bit tricky

First things first. This is not a blog post to blame OJVM. The problem just happens because datapatch for an OJVM patch touches data in the dictionary which hasn’t …

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OPatch Alert: Be aware of cleanup issues – and the JDK version

This is just a quick alert blog post for Friday with an OPatch Alert: Be aware of cleanup issues – and the JDK version. And thanks to several people who either commented or mailed me directly and asked if I could alert others as well.

OPatch Alert: Be aware of cleanup issues - and the JDK version

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OPatch cleanup issue

At first, you may have read earlier this week my article about patching my environments with the April 2020 bundle patches. For my patch activity, I’ve had to exchange my OPatch versions for 11.2.0.4, 12.2.0.1 and 19.7.0. And I guess, I would have had …

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ORA-1403 during TEXT / CONTEXT post upgrade

When you see an ORA-1403 during TEXT / CONTEXT post upgrade phase, regardless of using AutoUpgrade, dbupgrade, catctl or DBUA, no worries. Two people reported this to me this week. And my dear support colleague Klaus Herndl told me about the existing MOS note. But there is a bit more to explain, especially as the bug is non-public and the MOS note doesn’t tell you when this can happen.

ORA-1403 during TEXT / CONTEXT post upgrade

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What happens?

This is the error pattern you may see during the post upgrade phase when Oracle Text is installed in your database:

Oracle Database 
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Issues with seed databases, patch bundles and OJVM in 19c

I really rely on people telling me about issues they saw. And in this case, it happened twice within a few days. At OOW London, a customer came after my talk and told me about invalid objects and an incredible long recompilation time. In fact, he had to apply an OJVM patch in order to solve this. When I returned home, Jure commented on the blog about a very similar issue. I spent some time on the weekend to check it out. And I realized: There are issues with prebuilt seed databases and OJVM in 19c.

Issues with seed databases, patch bundles and OJVM in 19c

Photo by Max

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APEX is invalid after upgrading to 12.2 – ORA-20001

We are running the AutoUpgrade-for-RAC beta test since last week. And the first issue one customer encountered … is neither an AutoUpgrade nor a RAC issue. It has to do with APEX and SPATIAL, and missing grants. APEX is invalid after upgrading to 12.2 – ORA-20001

APEX is invalid after upgrading to 12.2 - ORA-20001

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What is happening?

You are doing an upgrade to Oracle Database 12.2.0.1. And you receive a number of errors during the component validation phase.

19:04:14 SQL> EXECUTE dbms_registry_sys.validate_components;
...(19:04:15) Starting validate_apex for APEX_180100
ORA-20001: MISSING GRANT: grant execute on "MDSYS"."SDO_DIM_ARRAY" to APEX_180100
ORA-20001: MISSING GRANT: grant execute on 
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GI Patch 28553832 may be needed before you upgrade to 19c

Thanks to my colleague Sebastian Alasino who works in the MAA team out of the UK. Sebas highlighted this issue to. And I’d like to share it with you when you attempt to upgrade Grid Infrastructure to Oracle 19c. If you have the Docker RPM  installed and you were lazy on patching, then GI Patch 28553832 may be needed before you upgrade to 19c.

GI Patch 28553832 may be needed before you upgrade to 19c

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What is the issue?

If the Docker Engine RPM is installed and your GI version is 12.1.0.2, 12.2.0.1 or 18c below a certain patch level, the CSSD demon fails to …

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ORA-1722 when upgrading to 19.4.0 or 19.5.0 on Windows

Oh boy – I try to avoid blogging about errors on a specific platform. But as this topic was brought to my attention now 3x in 2 weeks, I think I’ll send it out. And I hope you won’t hit this ORA-1722 when upgrading to 19.4.0 or 19.5.0 on Windows.

ORA-1722 when upgrading to 19.4.0 or 19.5.0 on Windows

What is failing?

The database upgrade only on the MS Windows platform fails when you attempt to upgrade to 19.4.0 or 19.5.0. This means, you downloaded and installed 19.3.0. And then you followed our advice and applied one of the most recent Release Update – ideally 19.5.0, the October …

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Database Migration from non-CDB to PDB – Various Pitfalls

There are several pitfalls when you plugin a non-CDB into a CDB environment. I’d like to highlight some of them – and show you potential workarounds as well. This is part of a series of blog posts to make your migration from non-CDB to PDB a bit smoother.

Database Migration from non-CDB to PDB - Various Pitfalls

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Database Migration from non-CDB to PDB – Various Pitfalls

In all the previous blog posts of this series I tried to explain specific pitfalls, and how you can workaround them. This article is meant to collect the “leftovers”, the minor issues and pitfalls which you may not …

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