Comments on: Introducing Oracle 11gR2 Edition Based Redefinition or: On Parallel Application Universes

By: Luohua Huang

Luohua Huang — Fri, 30 Dec 2011 09:55:20 +0000

Carl,
Actually, it is a nearly zero downtime. After you did EBR enabled on your apps, then it has the capabilities to apply online patching. And it will have a minute-based downtime to switch the pre-upgrade and post-upgrade sessions. During this phase, you need to bounce the mid-tier.

Luohua

By: Lucas Jellema

Lucas Jellema — Thu, 29 Dec 2011 14:24:54 +0000

Hi Kumar,

Do you mean the JDBC version? Or the Java version that is used for the Aurora VM inside the Oracle Database? (the latter is JDK 5)

Lucas

By: Kumar

Kumar — Mon, 19 Dec 2011 10:40:05 +0000

Which java version is supported to 11gR2

By: Carl Bruneau

Carl Bruneau — Tue, 16 Feb 2010 15:17:48 +0000

Hello Lucas,

Congratulation for this presentation regarding EBR (Edition-based Redefinition)!!!

But I don’t see how we can achieveÂ zero downtime.

Let’s take an example:

From the pre_upg edition to the post_upg edition we have to convert the data in one table.

The behavior in the edition triggers and viewÂ is based on the state of the data in this table.

If we want zero downtime, we have to synchronize the commit (that modified the data in the table) with the creation of the edition triggers and views. It’s not possible to have everything set at the same time. Thus we can have glitch…

Am I clear enought?

Best regards.

Carl