DST

Zero Downtime Upgrade of Timezone Data in Oracle 21c and 23c?

There is a feature in Oracle Database 21c I planned to write about for a very long time: Zero Downtime Upgrade of Timezone Data in Oracle 21c and 23c. This sounds very promising – but let us take a closer look together in this blog post.

Photo by Bruno Figueiredo on Unsplash

Time Zone Upgrade?

There is of course an ongoing discussion whether and when you should upgrade the DST version of your database to a current value. Since we all live in a more and more globalized world, this topic becomes more and more important. Even more important …

Choose your desired time zone version (DST) upgrade

Posted on May 24, 2023 by Mike.Dietrich Time Zone - DST Transportable 4

This morning I received a very reasonable question from a customer who has a time zone mismatch between source and target database. And he wants to transport into a PDB on Exadata. Even though, this sounds trivial at first sight, unfortunately it isn’t. But a bug fix done recently for a German automotive customer is very handy here. So let me show you how you can Choose your desired time zone version (DST) upgrade.

Choose your desired time zone version (DST) upgrade

Photo by Vince Veras on Unsplash

Where does the problem start?

In this particular – and not unusual case – the customer wants to migrate …

RUs contain now all available DST patches

Posted on January 19, 2023 by Mike.Dietrich Patch Recommendation Time Zone - DST 8

At first, Happy New Year everybody. There was silence on the blog for some weeks but I took an extended longer time off. Well, and once you return, there are some emails in your inbox which need some work. You’ll see several new blog posts getting published in the coming days. Back to normal, yesterday night RU 19.18.0 among other patch bundles has been released. And there’s a huge fantastic surprise in it: RUs contain now all available DST patches.

RUs contain now all available DST patches

Photo by Lukas Blazek on Unsplash

What’s the story?

There are some good news. We discussed this internally …

Oracle 19c Installation with 19.11.0 RU, OJVM and some other fixes

Posted on April 22, 2021 by Mike.Dietrich Installation Oracle Database 19c Patch Recommendation 40

In an previous blog post we showed how to install and patch in one single action. And as I use this technique all the time when I setup new homes, would like to show you an Oracle 19c Installation with 19.11.0 RU, OJVM and some other fixes. The purpose of this blog post is mainly to demonstrate again how you can install and patch in one action. But also to help you avoiding a pitfall when you apply the OJVM RU from April 2021.

Oracle 19c Installation with 19.11.0 RU, OJVM and some other fixes

Photo by Sammy Williams on Unsplash

What do we need?

At first, let us …

Upgrade: What if your time zone in source is newer than in target?

Posted on April 9, 2020 by Mike.Dietrich Time Zone - DST 15

Sometimes there is just a simple question at the beginning. Like Daniel and I discussed this morning. Does AutoUpgrade check if the time zone file in source is higher than in target? While we discussed this, I downloaded the patches already to try it out. And in addition, I could double-check whether the time zone patches for 19c are now RU-independent finally. But the question remains for Upgrade: What if your time zone in source is newer than in target?

Upgrade: What if your time zone in source is newer than in target?

Photo by Srikanta H. U on Unsplash

My intention wasn’t initially to write a longer blog post. But read below …

Data Pump: The Time Zone Pitfalls

Posted on May 14, 2019 by Mike.Dietrich Flaws and Pitfalls 13

Photo by Luis Cortes on Unsplash

Last week a very experienced colleague called me. He had issues with an export dump taken from an Oracle 20c database importing into 19c. It failed. So this blog post is about Data Pump: The Time Zone Pitfalls.

The Case

Usually you will see this issue only when you try to export from a higher version, and then attempt to import into a lower one. But the same thing can happen when you patched your databases partially with a newer time zone patch regardless of the version.

My colleague saw this error:

impdp system/welcome1@//localhost:1521/MYDB

DST Time Zone Patch V.32 and V.33 for Oracle 18.5.0

Posted on February 1, 2019 by Mike.Dietrich Uncategorized 7

If you’d ever attended one of Roy’s or my workshops, you know that we talk about time zone adjustments after the database upgrade. We explain why this is important. But as everything, it depends if you really need to apply and adjust. In our workshops we recommend one single note for time zone adjustments: MOS Note:412160.1 . This note has been updated and republished. It contains DST V.32 and DST V.33 links and references. Amit Grover from AWS contacted me and told me about a potential dependency of DST patches to the Oracle Update such as RU 18.4.0 or 18.5.0.…

How to patch all PDBs with the a new time zone file?

Posted on December 18, 2018 by Mike.Dietrich Patch Recommendation Single-/Multitenant Time Zone - DST 13

Yesterday I wrote about how to adjust the time zone setting in the PDB$SEED as by default the time zone scripts won’t touch the PDB$SEED when you execute them. And in addition, MOS Note:1509653.1 tells you, that the PDB$SEED can’t be adjusted. But this leads to a weird mix of time zone settings across a Multitenant deployment. Which I’d guess is not desired. Following a tweet reply by Marco Mischke I realized: I explained how to patch the PDB$SEED – but I didn’t explain how to patch all PDBs with the a new time zone file?

How to patch all PDBs with the a new time zone file?

Photo by Laureen

Does the PDB$SEED get “time zone” patched or not?

Posted on December 17, 2018 by Mike.Dietrich Single-/Multitenant Time Zone - DST 1

Today I received a question from a very experienced Oracle ACS engineer whether the PDB$SEED get time zone patched or not when a time zone patch gets applied. I’d say spontaneously “Of course, it does” but after thinking for a few seconds I started having doubts. Question is: Does the PDB$SEED get “time zone” patched or not?

Does the PDB$SEED get "time zone" patched or not?

Photo by Luis Cortes on Unsplash

Time zone scripts are in ?/rdbms/admin since Oracle 18c

First of all, since Oracle Database 18c the scripts to adjust time zone settings of the database are in ?/rdbms/admin. If you did our Hands-On Lab already …

Create a database with NON-DEFAULT Time Zone

Posted on December 8, 2016 by Mike.Dietrich DBCA Time Zone - DST Transportable Upgrade / Migration 0

One requirement of Transportable Tablespaces (and of course Full Transportable Export/Import as well) is to have identical database character sets AND identical time zone settings.

Problem

Source database has a lower time zone setting than the default target database in the destination home.

Lets assume you’d like to migrate an Oracle 11.2.0.4 off IBM AIX and migrate it into Oracle 12.1.0.2 on an Exadata meaning Oracle Linux 6. The source time zone version if it has never been upgraded would be TZ V14 – whereas the new Oracle 12.1.0.2 database you’d create would get TZ V18 by default.

Time Zone Setting Oracle Database

Solution 1

Let’s do the Time Warp again!

Posted on June 20, 2012 by Mike.Dietrich Time Zone - DST 0

Once you start reading about Daylight Saving Time changes in MyOracleSupport you’ll find still a lot of notes explaining this and that and back and forth. But sometimes there seems to be a bit too much information – and lacking clear instructions. Once a customer called that the “Time Zone Spaghetti” after reading MOS notes about DST for several hours ending up with the note where he has begun to read before still not clear what to do now 😉

I’m using usually the scripts from MOS Note:977512.1 as you’ll just have to exchange the DST version you are upgrading …

New Time Zone Patch DST V18 is available

Posted on June 19, 2012 by Mike.Dietrich Time Zone - DST 0

Sorry for not updating the blog more often at the moment – but more updates will come soon as I play around with Oracle Restart and single instance databases in ASM with Oracle 11.2.

Just on the side there’s a new time zone patch to DST V18 available since May 2012. You can download it via PATCH download from MOS with the patch number: 13417321

What do you think? Will Lufthansa operate a faster jet the other night? Will the jet stream be more powerful? Or a better type of fuel? Or is it just the travel portal which hasn’t …

Are you still on Daylight Savings Time?

Posted on October 31, 2011 by Mike.Dietrich Time Zone - DST 0

Central Europe and many other countries switched back from Daylight Savings Time to regular time on this Sunday’s night. But others don’t. Thanks to a “wise” decision in 2006 the US will switch back to regular time in one week. And another “wise” man has decided that there’s no need for Russia to switch back to regular time (see the last paragraph on “DST” in this linked Wikipedia article) – so Russia will stay forever on DST being one hour ahead 😉 Samoa will simply jump from the end of the time zone puzzle now heading it…

Time Zone Upgrade might be slow

Posted on May 23, 2011 by Mike.Dietrich Time Zone - DST 0

One of the best things with my role in Oracle’s Upgrade Development is:
I work with customers – and I learn a lot from customers.

This is an issue Richie and his team from Accenture in Ireland brought to my attention. I try to support them currently in an EBS database upgrade. And he did highlight a potential issue with the post upgrade time zone change to me:

Bug 10209691 – slow performance on ALL_TSTZ_TAB_COLS
Workaround: alter session set “_with_subquery”=materialize;

All together the upgrade of an Oracle 9.2.0.8 EBS 11i database takes approx 30 minutes. And we still do recommend …

DST

Zero Downtime Upgrade of Timezone Data in Oracle 21c and 23c?

Time Zone Upgrade?

Choose your desired time zone version (DST) upgrade

Where does the problem start?

RUs contain now all available DST patches

What’s the story?

Oracle 19c Installation with 19.11.0 RU, OJVM and some other fixes

What do we need?

Upgrade: What if your time zone in source is newer than in target?

Data Pump: The Time Zone Pitfalls

The Case

DST Time Zone Patch V.32 and V.33 for Oracle 18.5.0

How to patch all PDBs with the a new time zone file?

Does the PDB$SEED get “time zone” patched or not?

Time zone scripts are in ?/rdbms/admin since Oracle 18c

Create a database with NON-DEFAULT Time Zone

Problem

Solution 1

Let’s do the Time Warp again!

New Time Zone Patch DST V18 is available

Are you still on Daylight Savings Time?

Time Zone Upgrade might be slow

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