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CDB upgrades – explaining catctl_options

When you upgrade your entire CDB with AutoUpgrade, there is a parameter which allows you some tuning or tweaking. And I often see some misunderstanding here. Therefore, for CDB upgrades – explaining catctl_options is my focus today.

CDB upgrades - explaining catctl_options

Photo by Arthur Mazi on Unsplash

catctl_options – what it is meant for

This AutoUpgrade config file parameter allows you to set specific settings, mostly for tuning, but also to override some defaults. In the documentation you will find the whole list of options. You can set it in your AutoUpgrade config file, e.g.:

upg1.catctl_options=-T

catctl_options in CDB upgrades

Here, …

Queries on dictionary tables are slow in Oracle Multitenant?

Posted on February 10, 2025 by Mike.Dietrich Flaws and Pitfalls Single-/Multitenant 12

I love to learn something new every day. And on Friday afternoon last week I learned something new again. It started (as often) with a very simple question from a colleague working from the Oracle Malaga office in Spain. The customer has an issues with some queries being slower than before once they moved from on-prem to the cloud into a PDB. But are queries on dictionary tables are slow in Oracle Multitenant generally?

Queries on dictionary tables are slow in Oracle Multitenant?

Photo by Pascal van de Vendel on Unsplash

What was the case?

The customer ran some queries against dictionary views in the PDB in Oracle Database …

Binary patching is slow because of the inventory

Posted on May 10, 2022 by Mike.Dietrich Patch Recommendation 57

The headline of this blog post may sound a bit cryptic: Binary patching is slow because of the inventory. But actually this seems to be one of the main causes when your binary patching gets slower and slower with every patch you apply.

Photo by Valdemaras D. on Unsplash

The more you patch, the worse it gets

Well, this is a tough headline. But you may have read my blog posts about my quarterly patching experience. It actually started with the July 2021 RU in my 19c environment when I wrote:

At least in my environment, both checks with the

Speed up Upgrade Phase 65 with a new catuposb.sql

Posted on July 5, 2016 by Mike.Dietrich Flaws and Pitfalls Upgrade / Migration 10

Credits to Chris Smids from Proximus in Belgium 🙂 Thanks, Chris!!!

Upgrade to Oracle 12.1.0.2 is slow in phase: #65 ?

You are wondering why phase: #65 of the database upgrade to Oracle Database 12.1.0.2 takes quite a while. You dig down into the catupgrd0.log and recognized this statement taking a while:

dbms_output.put_line('catuposb, update 4 - rows updated ' || rows_updated);
END; -- end of update for system internally generated objs
/

The cause for this issue is buried in the script catuposb.sql hitting stale histograms which did not get refreshed even if you gathered dictionary stats before the upgrade …

Will gathering fixed object stats reduce recompilation time post upgrade?

Posted on May 30, 2011 by Mike.Dietrich Best Practice Oracle Database 11g 2

Interesting question, isn’t it?
Will the time to recompile invalid objects post upgrade decreased once fixed object stats have been gathered?

First of all fixed object stats on X$-tables won’t be gathered by default [This will change with Oracle 12c where it is part of the Auto Stats Gathering job].
X$ structures are undocumented. V$ views are build on top of them and
should only be used even though it might be sometimes useful to access
X$ tables such as X$BH (buffer headers – contains information describing the current contents of a piece of the buffer cache…

Speed Up

CDB upgrades – explaining catctl_options

catctl_options – what it is meant for

catctl_options in CDB upgrades

Binary patching is slow because of the inventory

The more you patch, the worse it gets

Speed up Upgrade Phase 65 with a new catuposb.sql

Upgrade to Oracle 12.1.0.2 is slow in phase: #65 ?

Will gathering fixed object stats reduce recompilation time post upgrade?

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