Thanks for coming to my presentations in RAC day at Dublin, Ohio. Please find the presentation files below. Hopefully, I will get video files and upload that here too.

OOUG presentation files and scripts

md5 checksum of the zip file is:

$md5sum ooug_2015_pdf.zip
df8bdcbc02926e5bbd721514b473bf16  ooug_2015_pdf.zip

I had a recent conversation at Oracle OpenWorld 2015 about a locking anomaly in a 3-node RAC system which was causing unexpected deadlocks. Coincidentally, this conversation came about shortly after I had been listening to Martin Widlake talking about using the procedure dbms_stats.set_table_prefs() to adjust the way that Oracle calculates the clustering_factor for indexes. The juxtaposition of these two topics made me realise that the advice I had given in “Cost Based Oracle – Fundamentals” 10 years ago was (probably) incomplete, and needed some verification. The sticking point was RAC.

I will be talking about RAC and performance in-depth, with lots of demos, in a RAC day training with Ohio Oracle User group on Nov 16,2015 Monday. Venue for the presentation is Dublin, Ohio.

Agenda for the day:

08:00a – 09:00: Registration / Breakfast

09:00a – 09:15: Announcements -Introduction of the speaker

09:15a – 10:30: Underpinning for Oracle RAC and Clusterware

10:30a – 10:45: Break

10:45a – 11:45: RAC cache fusion internals

11:45a – 01:00: Lunch

01:00p – 02:00: RAC Performance tuning Part 1 – Wait events and object tuning

02:00p – 02:15: Break

02:15p – 03:30: RAC performance tuning Part 2 – locks, library cache locks etc.

03:30p – 03:45: Member Announcements, Gift Drawings

Please RSVP to the co-ordinators so that you will have a seat »

• Original article

Following on from the last post, I’ve brought my NFS RAC stuff up to date also.

• Oracle Database 12c Release 1 (12.1.) RAC on Oracle Linux 7 Using NFS

I noticed I had not done a RAC install using NFS on Oracle Linux 6, so I threw that in for good measure too.

This is a little note to myself on how to fix a corrupt spfile in clustered ASM. I hope you find it useful, too.

Let’s assume you made a change to the ASM (server) parameter file that causes an issue. You are most likely to notice this once CRS is restarted but parts of the stack fail to come up. If “crsctl check crs” mentions any component not started you can try to find out where in the bootstrap process you are stuck. Here is the output from my system.

I will be presenting two topics in IOUG Collaborate 2015 in Vegas. Use the show planner and add my presentations to your schedule »

• Original article

I will be talking in Rocky Mountain Oracle User Group Training Days 2015( http://www.rmoug.org), with live demos (hopefully there will be no failures in the demo). My topics are:

Feb 17: Deep dive: 3:15PM to 5:15PM – RAC 12c optimization: I will discuss RAC global cache layer in detail with a few demos. You probably can’t find these deep Global Cache layer details anywhere else »

• Original article

In the first part of the article series you could read how a kickstart file made the installation of Oracle Linux 7 a lot more bearable. In this part of the series it’s all about configuring the operating system. The installation of Grid Infrastructure and the Oracle database is for another set of posts.

There are quite some differences between Oracle Linux 6 and 7

It seems that I’m getting more and more drawn into the world of performance analysis, and since I sometimes tend to forget things I need to write them down. I almost enjoy the “getting there” more than ultimately solving the problem. You pick up quite a few things on the way.

This environment is Exadata 12.1.1.1.1/Oracle 12.1.0.2 but as with so many things the fact that the database is on Exadata shouldn’t matter.

So here is one of these posts, this time I’m writing up what I saw related to GC Buffer Busy Acquire.

gc buffer busy acquire?

Whenever I see a wait event I haven’t dealt with extensively in the past I try to provoke behaviour to study it more closely. But first you need to know the event’s meaning. One option is to check v$event_name: