Dictionary Stats

When Fixed Object Stats Gathering takes very long during upgrade …

Posted on October 20, 2020 by Auditing AutoUpgrade Flaws and Pitfalls 6

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

… Continue reading...

How long will my database upgrade take? Revisited …

Posted on March 17, 2020 by Best Practice 6

I received this question twice within a few days. And I remember that a tiny little while ago I wrote something on the blog about it. But as this “while” is 11 years ago, I came to conclusion to refresh this topic – and write something about How long will my database upgrade take? Revisited …

How long will my database upgrade take? Revisited ...

Photo by Aron Visuals on Unsplash

Is there a query?

At first, before I go into details, an important fact upfront: There is neither any query nor any tool giving you a rough estimate or precise figure of how long your upgrade will …

Continue reading...

Differences between Automatic Statistics Gathering job and GATHER_SCHEMA_STATS

Posted on March 1, 2016 by Oracle Database 12c Statistics 12

Recently a customer raised a question whether there are differences between the Automatic Statistics Gathering job and a manual creation of stats via the GATHER_SCHEMA_STATS procedure.

The results in performance were quite interesting. Performance after an upgrade from Oracle Database 11.2.0.3 to Oracle Database 11.2.0.4 was not good when the automatic stats job got used. But performance changed significantly to the better when schema stats were created with the downside of taking more resources during the gathering.

Is the Automatic Stats Gathering job enabled?

That question can be answered quite easily. There’s a very good [MOS Note has been disappeared] …

Continue reading...
Mike Dietrich
Oracle Senior Director of Product Management for Database Upgrade, Migrations and Patching writing just another blog.

Opinions certainly are my own as is this page.

Archives

Categories

Upgrade @YouTube

Subscribe via Email

Join 8,089 other subscribers

Follow me on Twitter