Database

DBAKevlar at Collaborate 2015

Here’s a quick guide to my schedule of sessions at IOUG Collaborate 2015 for this year.

Oracle database operating system memory allocation management for PGA

This post is about memory management on the operating system level of an Oracle database. The first question that might pop in your head is: isn’t this a solved problem? The answer is: yes, if you use Oracle’s AMM (Automatic Memory Management) feature, which let’s you set a limit for the Oracle datababase’s two main memory area’s: SGA and PGA. But in my opinion any serious, real life, usage of an Oracle database on Linux will be (severely) constrained in performance because of the lack of huge pages with AMM, and I personally witnessed very strange behaviour and process deaths with the AMM feature and high demand for memory.

SIOUG and HROUG Fall Conferences, 2014!

I’ve just returned from my honeymoon in Venice with the wonderful Tim Gorman, but before we enjoyed our week in this picturesque city, we spent a week doing joint keynotes and two sessions each on our own tech topics at these two incredible conferences in neighboring countries.

[Oracle] - New diagnostic event "wait_event[]" (and others) for troubleshooting / researching purpose with Oracle 12c

Introduction

A long time has gone since my last blog post on SCN in March 2014, but i was quite busy with Oracle RAC implementations and troubleshooting performance issues in the last month. It was a quite interesting time for me and i have learned a lot of new stuff about Oracle 12c and so in consequence this is just a tiny blog post about a new diagnostic event called "wait_event[]", which was introduced with Oracle 12c R1 (12.1.0.1). Oracle has re-engineered its kernel diagnostics & tracing infrastructure with Oracle 11g, which allows you to be much more detailed and extensive by tracing and dumping diagnostic / low level (internals) information. Please check the reference section for more detailed information about that "new" kernel diagnostics & tracing infrastructure, if you have never heard of it until yet.

 

Pattern Matching (MATCH_RECOGNIZE) in Oracle Database 12c

I’ve spent the last couple of evenings playing with the new SQL pattern matching feature in Oracle 12c.

I’m doing some sessions on analytic functions in some upcoming conferences and I thought I should look at this stuff. I’m not really going to include much, if anything, about it as my sessions are focussed on beginners and I don’t really want to scare people off. The idea is to ease people in gently, then let them scare themselves once they are hooked on analytics. :) I’m thinking about Hooked on Monkey Fonics now…

Roll up! Roll up! Nothing new to see here! (Database Web Services)

Over the years I’ve written loads of stuff about consuming and publishing web services directly from the database. I’ve been doing quite a bit of this at work recently and I realised how difficult it is to find all the pieces, since they are spread across multiple articles, spanning multiple database versions. In an attempt to give a single point of entry I’ve written this very brief article.

It’s really more of a links page. :)

If you are new to the idea of using the database for web services, it might come as a surprise what you can do without having to turn to the dark side (middleware). :)

Patching Time

Just a quick note to point out that the October PSU was just released. The database has a few more vulnerabilities than usual (31), but they are mostly related to Java and the high CVSS score of 9 only applies to people running Oracle on windows. (On other operating systems, the highest score is 6.5.)

I did happen to glance at the announcement on the security blog, and I thought this short blurb was worth repeating:

Patching Time

Just a quick note to point out that the October PSU was just released. The database has a few more vulnerabilities than usual (31), but they are mostly related to Java and the high CVSS score of 9 only applies to people running Oracle on windows. (On other operating systems, the highest score is 6.5.)

I did happen to glance at the announcement on the security blog, and I thought this short blurb was worth repeating:

Patching Time

Just a quick note to point out that the October PSU was just released. The database has a few more vulnerabilities than usual (31), but they are mostly related to Java and the high CVSS score of 9 only applies to people running Oracle on windows. (On other operating systems, the highest score is 6.5.)

I did happen to glance at the announcement on the security blog, and I thought this short blurb was worth repeating:

JSON Support in Oracle Database 12c (12.1.0.2)

I spent a bit of time at OpenWorld looking at the JSON support in Oracle Database 12c. I started to write some stuff about it on the plane home and I spent the last two mornings finishing it off. You can see the results here.

I’ve tried to keep it light, since the documentation does a pretty good job at explaining all the variations of the syntax. I’ve also avoided trying to teach people about JSON itself. There is loads of stuff about that on the net already.

For the most part I think the JSON support looks pretty cool. During the process of writing the articles I did notice a few of things that I thought might confuse.