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12cR2

Initialization Parameters Set at the PDB Level Are Not Always Honored

Before describing the issue that lead to this post, let’s shortly review how the handling of initialization parameters works in a multitenant environment.

Oracle 12cR2: Database parameters

For those in a desperate need to learn all 4841 database parameter variations of the…

Approximate Aggregate Transformation (AAT)

There are situations where approximate results are superior than exact results. Typically, this is the case when two conditions are met. First, when the time and/or resources needed to produce exact results are much higher than for approximate results. Second, when approximate results are good enough. Approximate results are for example superior in case of exploratory queries or when results are displayed in a visual manner that doesn’t convey small differences.

Trace Files Split in Multiple Parts

Last January, in the following tweet, I pointed out that the documentation vaguely mentions that a trace file may be split into several files.

Adaptive Query Optimization Configuration: Parameters, Preferences and Fix Controls

The aim of this post is to summarize the knowledge about the 12.1 and 12.2 adaptive query optimizer configuration that, as far as I know, is spread over a number of (too many) different sources.

First of all, let’s shortly review which adaptive query optimization features exist:

SQL Trace in Oracle Database Exadata Express Cloud Service

Today I started having a look to the Oracle Database Exadata Express Cloud Service announced last week at Oracle OpenWorld. Note that since the amount of resources provided (in summary, 1 OCPU, 20 or 50 GB of database storage) is very limited, in general, in my opinion that service will only be useful for functional tests. In fact, if it wasn’t because that is the very first 12.2 release (12.2.0.0.3 according to V$VERSION) available, I doubt I would care about it…

A first important thing to know is that the service gives access to a PDB via SQL*Net only (in addition to the web-based interfaces like APEX). In other words, the OS access is precluded.

Oracle WebLogic 12cR2 and ADF Runtime Installations…

The new versions of the WebLogic 12cR2 and ADF could not have come at a worse time for me. My top priority is learning about the 12cR1 version of the database. Second, is getting to grips with Cloud Control 12cR3. Third on the list is getting up to speed with the changes in WebLogic 12cR2 and ADF. Unfortunately, my personal priorities don’t quite match my work priorities, so WebLogic 12cR2 has moved up the list for a while. As a result, I did some installations last night.

How can we make Oracle Database 12cR2 the best release ever?

Oracle will be releasing Oracle Database 12cR1 at some point this year. Many companies will avoid this release, opting to wait for 12cR2, their reasoning being it will be more stable and, as a terminal release, will have a longer support life-cycle. Since 12cR2 is what most businesses care about, what can we do to make it as good as it can possibly be? Here are a few thoughts…

Cloud Control 12cR2 : Is it really release 2?

Oracle Cloud Control 12cR2 is installed and merrily monitoring one of the test 11gR2 databases running on HP-UX. I’ll probably leave it like that until I come back from Oracle OpenWorld. I don’t want to change the entire administration and monitoring infrastructure just as I leave for a couple of weeks.

As I’m re-familiarizing myself with the 12c way of doing things, I’ve been wondering if this really is a full “Release 2″ product, or just 12cR1 with Bundle Patch 2. Not surprisingly, one of my readers asked the same question, pointing out the version 12.1.0.2 does not look consistent with a “Release 2″ product, which would typically be 12.2.0.1.

Enterprise Manager Cloud Control 12c Release 2…

Enterprise Manager Cloud Control 12c Release 2 was released a couple of days ago for all the major platforms. That in itself is not news any more, but the fact we are going to trial it at work as a replacement for our 11g Grid Control installation is.

It’s in my low priority task list, so I’m not sure I’ll get it all sorted before OOW12, but it is something to look forward too. I know it’s tragic, but I’m quite excited. :)

Cheers

Tim…