Fallback

Virtual Classroom Seminars 10-12: Videos and Slides are available

Posted on December 13, 2021 by Mike.Dietrich Workshop 0

Thanks to all of you for participating in our last 3 web seminar session. And since some of you had to leave earlier in one of the Virtual Classroom Seminars 10-12: Videos and Slides are available for download and on-demand viewing.

Virtual Classrom Seminar - Migrating Large Databases

No registration is required – you can watch all of our seminars anytime.

And as usual, our workshops are free of buzz words and explain only technical topics. The presenters Roy Swonger, Daniel Overby Hansen, Rodrigo Jorge, Bill Beauregard and myself, we all love to talk about technical topics, show and share demos and put …

Virtual Classroom Seminar: Fallback Is Your Insurance – on Nov 11, 2021

Posted on November 10, 2021 by Mike.Dietrich Workshop 4

No worries, I haven’t become lazy recently. But the past weeks were more busy than anything I have experienced so far. And I had a full week off and enjoyed the silence and absence from blogs and cell phones and email in the mountains. But now I’m back – and surprise, surprise – this week on Thursday we’ll have our 11th Virtual Classroom Seminar: Fallback Is Your Insurance – on Nov 11, 2021.

Fallback Seminar

When will it happen?

Thursday, Nov 11, 2021 – 10:00h CET

What are we going to talk about?

Fallback and Rollback. How to secure your job. …

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

Photo by Esri Esri on Unsplash

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:

Fallback Strategy: Partial Offline Backup

with graphics included. In brief, you take …

3 Live Seminars: Multitenant Seminar 3 Questions answered

Posted on May 3, 2020 by Mike.Dietrich Workshop 0

This is the third and final QA blog post for the Seminars we did in the last week of April 2020. Thank you for your attendance. I will publish the replay recordings as soon as they are available and link them as well. For now, please find here 3 Live Seminars: Multitenant Seminar 3 Questions answered.

3 Live Seminars: Multitenant Seminar 3 Questions answered

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Your Questions, our Answers for Seminar 3: Multitenant

103	We are in the process of migrating to Oracle Cloud using the xtts method for cross platform migration and we seem to be encountering an issue with it

3 Live Seminars: Database Upgrade and more – April 28, 29 and 30, 2020

Posted on April 24, 2020 by Mike.Dietrich Workshop 13

Well, everybody does Web Seminars now, right? Just in case you sit at home next week on Tuesday, Wednesday and Thursday, you’ve just had your lunch. And you don’t know what do to in the afternoon, sign up and click in to our 3 Live Seminars: Database Upgrade and more – April 28, 29 and 30, 2020. Every day at the same time, 14:30h CET (or 13:30 GMT or 18:00 IST).

3 Live Webinars: Database Upgrade and more – April 28, 29 and 30, 2020

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Another Web Seminar?

It’s free – FIND THE REGISTATION LINKS BELOW – of course. My colleague Laura Garcia and I will talk …

Troubleshooting, Restoring and Restarting AutoUpgrade

Posted on April 8, 2020 by Mike.Dietrich AutoUpgrade 71

What if … something goes wrong during your database upgrade with AutoUpgrade? Of course, this never happens. But just in case, no worries – one of the really big advantages of AutoUpgrade (and the command line upgrade with “dbupgrade” as well) is its resumability and restartablity. But in this blog post I would like to cover a bit more. I will show you more details on Troubleshooting, Restoring and Restarting AutoUpgrade.

Troubleshooting, Restoring and Restarting AutoUpgrade

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And as often, the cause for this blog post is an email from Hervé Schweitzer, the CTO of dbi-services. Hervé told …

AutoUpgrade and the COMPATIBLE parameter

Posted on March 18, 2020 by Mike.Dietrich AutoUpgrade 2

Several times I’ve got asked by customers if AutoUpgrade does change the COMPATIBLE parameter. So let me explain what happens to COMPATIBLE when you upgrade. And give you also some hints about AutoUpgrade and the COMPATIBLE parameter.

AutoUpgrade and the COMPATIBLE parameter

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Does AutoUpgrade change COMPATIBLE?

No. Clearly, AutoUpgrade does not change the COMPATIBLE parameter for several reasons. At first, we recommend to not change the COMPATIBLE parameter right after the upgrade if you can afford another downtime soon after. By keeping COMPATIBLE on the previous (before upgrade) value, you have the choice to revert back to the previous …

Database Migration from non-CDB to PDB – Migration with Data Pump

Posted on August 14, 2019 by Mike.Dietrich Data Pump Single-/Multitenant 10

You may have realized that there are a few techniques missing describing how to do a Database Migration from non-CDB to PDB – Migration with Data Pump is one of them. I will explain the most simple approach of going to Single- or Multitenant. It isn’t the coolest – and it isn’t very fast as soon as your database has a significant size. But it is not complex. And it allows you to move even from very old versions directly into an Oracle 19c PDB – regardless of patch levels or source and destination platform.

Database Migration from non-CDB to PDB – Migration with Data Pump

High Level Overview

Endianness change

Database Migration from non-CDB to PDB – The Fallback Challenge

Posted on August 5, 2019 by Mike.Dietrich Fallback Single-/Multitenant 2

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.

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Database Migration from non-CDB to PDB – The Fallback Challenge

As I work with customers on upgrades and migrations for a very long time, I know how important a proper fallback is.

When you attempt a migration from a non-CDB to PDB, you need to plan …

Database Migration from non-CDB to PDB – Various Pitfalls

Posted on August 2, 2019 by Mike.Dietrich Flaws and Pitfalls Single-/Multitenant 22

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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 …

Database Migration from non-CDB to PDB – The Patch Level Pitfall

Posted on August 1, 2019 by Mike.Dietrich Flaws and Pitfalls Single-/Multitenant 0

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Database Migration from non-CDB to PDB – The Patch Level Pitfall

When you consolidate on a larger scale, it is very likely that you have different patch levels in your database environments. But when you attempt to plugin a non-CDB into a CDB, you may see …

Database Migration from non-CDB to PDB – The Component Pitfall

Posted on July 31, 2019 by Mike.Dietrich Flaws and Pitfalls Single-/Multitenant 6

Photo by Brett Jordan on Unsplash

The Component Pitfall

With component we mean the database component which you can find in DBA_REGISTRY – or CDB_REGISTRY. When Multitenant became available over 5 years ago, a decision had been made to make all options/components mandatory in a container database. This decision had to …

Database Migration from non-CDB to PDB – The Time Zone Pitfall

Posted on July 30, 2019 by Mike.Dietrich Flaws and Pitfalls Single-/Multitenant 0

Photo by Allef Vinicius on Unsplash

Database Migration from non-CDB to PDB – The Time Zone Pitfall

Interestingly, there is no issue with different time zone settings within a single CDB. Your CDB$ROOT can be on DST V.32 whereas a PDB you plugin can be already on DST V.33. But only …

Database Migration from non-CDB to PDB – The COMPATIBLE pitfall

Posted on July 29, 2019 by Mike.Dietrich Flaws and Pitfalls Single-/Multitenant 0

Database Migration from non-CDB to PDB - The COMPATIBLE pitfall

Database Migration from non-CDB to PDB – The COMPATIBLE pitfall

When you migrate your non-CDB to PDB, in most cases the COMPATIBLE setting of the non-CDB will be lower than the setting of the receiving CDB. But still in this case you may see warnings. I will explain how to deal with …

Database Migration from non-CDB to PDB – Typical Plugin Issues and Workarounds

Posted on July 29, 2019 by Mike.Dietrich Flaws and Pitfalls Single-/Multitenant 0

In the previous blog posts I showed different approaches on how to migrate your database on a same Endianness platform into Multitenant. Whether you prefer to upgrade first or plugin first is up to you. I recommend upgrading first as this allows you a seamless fallback. But regardless of which approach you prefer, you may take care on potential pitfalls. Hence, this blog post is about Database Migration from non-CDB to PDB – Typical Plugin Issues and Workarounds. It may not be complete when I publish it and I may extend it later on. Let me know if you have …

Database Migration from non-CDB to PDB – Clone via NON$CDB, upgrade, convert

Posted on July 25, 2019 by Mike.Dietrich Single-/Multitenant 11

The third option for plugging in a non-CDB is called Database Migration from non-CDB to PDB – Clone via NON$CDB, upgrade, convert. As I showed already in this blog post a while ago, your source must be at least an Oracle 12.1 database. And this technique can be used also only for same-Endianness migrations but does not apply if you’d like to migrate from Big to Little Endian. If your source database matches already the receiving CDB, no upgrade is necessary.

Photo by Samuel Chan on Unsplash

High Level Overview

Endianness change possible:	No
Source database versions:	Oracle 12.1.0.2

Database Migration from non-CDB to PDB – Plug in, upgrade, convert

Posted on July 24, 2019 by Mike.Dietrich Single-/Multitenant 2

This is my next blog post about Database Migration from non-CDB to PDB – Plug in, upgrade, convert. But what is different from the previous one? And why is it necessary? Since Oracle Database 12.2.0.1 you can plugin a non-CDB at first, the upgrade and convert it. And I’ll show you this technique here.

Photo by Dan Freeman on Unsplash

High Level Overview

Endianness change possible:	No
Source database versions:	Oracle 12.2.0.1 or newer (or 12.1.0.2 when CDB has shared UNDO or with a patch adding the UNDO commands to DBMS_PDB.DESCRIBE in 12.1.0.2)
Characteristic:	Plugin into CDB first
Upgrade

When and how should you change COMPATIBLE?

Posted on April 17, 2019 by Mike.Dietrich Best Practice 59

When and how should you change COMPATIBLE?

COMPATIBLE is an almost mystic parameter. It has a default setting for each release. But if you try to find more information what it really does, you won’t be very happy. And in reply to my previous blog post about whether you need to change COMPATIBLE when you apply an RU, I received the following question: When and how should you change COMPATIBLE?

What does COMPATIBLE do?

To find an answer to this question, I consulted the documentation at first. And I found this:

COMPATIBLE
Setting COMPATIBLE ensures that new features do not write data formats or structures

Fallback Strategy: Partial Offline Backup

Posted on July 17, 2018 by Mike.Dietrich Fallback 2

Oh, I think it took us years to get rid of recommendations in MOS notes saying before this or that change you must take an offline backup. These recommendations dated back to times where not almost everybody was using RMAN for online backups. But the times have changed. Still, there are situations where the “Offline Backup” word can be mentioned. And in this blog post I will describe a Fallback Strategy: Partial Offline Backup.

Usage Scenario

This method will only protect you against failure during an upgrade.

First of all, Offline Backup sounds really brutal and old-fashioned. …

Upgrade and Migration Office Hours on April 19, 2018

Posted on April 16, 2018 by Mike.Dietrich Office Hours 0

It’s time for the next Office Hours session with the Upgrade Development Team. The Upgrade and Migration Office Hours on April 19, 2018 features the topic “Fallback Strategies“. Roy will prepare a short slide intro. And afterwards we’ll happily take your questions.

What are “Office Hours”?

This is a new interactive format we really like. Several groups in Oracle schedule Office Hours sessions. Roy and I held our first Office Hours session on February 21, 2018 for a full hour trying to answer your questions regarding database upgrades and migrations live and directly.

How do you sign up?

Fallback Strategies with Full Transportable Export/Import

Posted on March 2, 2018 by Mike.Dietrich Fallback Transportable 3

I received an interesting question about how to implement Fallback Strategies with Full Transportable Export/Import several times within the past weeks. So it may be a good idea to showcase some possible scenarios.

Full Transportable Export/Import is an Oracle 12c feature which allows you to do a transportable tablespace migration but Data Pump will take away all the manual steps with only one command. You may need to have markers to revert to in order to avoid restarting the entire operation from scratch again.

And there are some special behaviors to know about, at first with Full Transportable Export/Import but …

Fallback Strategy: Flashback Pluggable Database

Posted on August 30, 2017 by Mike.Dietrich Fallback Single-/Multitenant 6

Since Oracle Database 12.2 an important feature works now for pluggable databases as a Fallback Strategy: Flashback Pluggable Database in Oracle 12.2. This was missing in Oracle Database 12.1.

Actually I missed this feature a lot as I use “Flashback” almost everyday. And you could only rewind the entire deployment with a FLASHBACK DATABASE command.

Fallback Strategy: Flashback Pluggable Database

Fallback Strategy: Flashback Pluggable Database in Oracle 12.2 Actually having the possibility to flashback a pluggable database without effecting the other PDBs is really important. Did you ever want to try out what happens if you TRUNCATE TABLE SYS.PROPS$? Give it a try – but set a …

Guaranteed Restore Points as Fallback Method

Posted on June 28, 2012 by Mike.Dietrich Fallback 1

Thanks to the great audience yesterday in the Upgrade & Migration Workshop in Utrecht. That was really fun and I was amazed by our new facilities (and the “wellness” lights surrounding the plenum room’s walls).

And another reason why I like to do these workshops is that often I learn new things from you 🙂 So credits here to Rick van Ek who has highlighted the following topic to me. Yesterday (and in some previous workshops) I did mention during the discussion about Fallback Strategies that you’ll have to switch on Flashback Database beforehand to create a…

Upgrade Fallback: Offline Backup??

Posted on May 19, 2011 by Mike.Dietrich Best Practice Fallback 0

When me an Roy talk about Fallback Scenarios in our Upgrade Workshop we cover first issues happening during the upgrade and second issues happening a few days (hours, weeks) after the upgrade.

One of the fallback options for issues encountered during the upgrade is to take an offline backup. Ok, not a complete offline backup of your 24TB database. Take all data tablespaces into read-only mode, then shutdown the database. Take a backup of all datafiles for SYSTEM, SYSAUX and UNDO plus the controlfiles plus the redologs. TEMP files are not a requirement as you could …

Fallback

When will it happen?

What are we going to talk about?

Partial Offline Backup Strategy?

Your Questions, our Answers for Seminar 3: Multitenant

Another Web Seminar?

Does AutoUpgrade change COMPATIBLE?

High Level Overview

Database Migration from non-CDB to PDB – The Fallback Challenge

Database Migration from non-CDB to PDB – Various Pitfalls

Database Migration from non-CDB to PDB – The Patch Level Pitfall

The Component Pitfall

Database Migration from non-CDB to PDB – The Time Zone Pitfall

Database Migration from non-CDB to PDB – The COMPATIBLE pitfall

High Level Overview

High Level Overview

What does COMPATIBLE do?

Usage Scenario

What are “Office Hours”?

How do you sign up?

Fallback Strategy: Flashback Pluggable Database

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