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January 2017

My New Role at Delphix

I’ve been at Delphix for just over six months now.  In that time, I was working with a number of great people on a number of initiatives surrounding competitive, the company roadmap and some new initiatives.

The Delphix Trial on AWS- Get It While Its HOT!

I don’t want to alarm you, but there’s a new Delphix trial on AWS!  It uses your own AWS account and with a simple set up, allows you to deploy a trial Delphix environment.  Yes, you hear me right-  just with a couple steps, you could have your own setup to work with Delphix!

ASSM Help

I’ve written a couple of articles in the past about the problems of ASSM spending a lot of time trying to find blocks with usable free space. Without doing a bit of rocket science with some x$ objects, or O/S tracing for the relevant calls, or enabling a couple of nasty events, it’s not easy proving that ASSM might be a significant factor in a performance problem – until you get to 12c Release 2 where a staggering number of related statistics appear in v$sysstat.

I’ve published the full list of statistics (without explanation) at the end of this note, but here’s just a short extract showing the changes in my session’s ASSM stats due to a little PL/SQL loop inserting 10,000 rows, one row at a time into an empty table with a single index:

An introduction to Performance Co Pilot, part 2.

This second blogpost on Performance Co Pilot or PCP in short is about visualisation. In case you haven’t read the first part, here it is, which describes how it works, why you should use it, and how you can install it.

Pmchart.
One way of visualising PCP is using the pmchart utility. The pmchart utility is installed via the pcp-gui package (yum install pcp-gui). The pmchart utility uses X to display a window and draw lines, bar graphs, area graphs, etc. in a sense alike the performance manager on Microsoft Windows. You can select the individual performance statistics PCP measures, which can be viewed and investigated with pminfo, for example kernel.all.cpu.user:

Oracle Database Cloud (DBaaS) Performance - Part 3 - Storage - 12.2 Update

Recently I repeated the I/O related tests on a 12.2.0.1 instance for curiosity and was surprised by the fact that I consistently got significantly better results as on 11.2.0.4 and 12.1.0.2.

Now you're probably aware that the version 12.2 so far is "cloud-only", so I can't tell / test whether the version 12.2 is generically providing that increased performance or whether Oracle has optimized the underlying stack, so that previous versions in general could also benefit from better performance if they ran on the same platform. Repeated tests with versions 11.2.0.4 and 12.1.0.2 confirmed the performance figures reported in the previous installment of this series, so as of the time of writing it's only the version 12.2 that provides the improved I/O performance.

Note that as of the time of writing only a single instance configuration was supported with version 12.2, so I wasn't able to run the tests in RAC configuration.

RMOUG Training days 2017

I will be speaking about the following topics in Rocky Mountain Oracle User group Training days (RMOUG, Denver) February 7-9, 2017.

Come to my presentations and say Hi to me </p />
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DBaaS Performance

I don’t know how I missed it but Randolf Geist has been doing writing a series of posts on the performance of Oracle’s DBaaS offering, using a series of long-running tests to capture not only raw performance figures but also an indication of consistency. You can find all of these tests with a search URL on his blog, but I’ve also created a little index here to make it easier for me to access them in order.

Basicfile LOBs

I wrote a short series a little while ago about some of the nasty things that can happen (and can’t really be avoided) with Basicfile LOBs and recently realised that it needed a directory entry so that I didn’t have to supply 6 URLs if I wanted to point someone to it; so here’s the catalogue:

12.2 Index Advanced Compression “High” Part III (I Can’t Give Everything Away)

If you like the look of the new Index Advanced Compression setting of “High” available with Oracle Database 12c Release 2 as I’ve discussed previously in Part I and Part II, well there’s a way to make this the default index compression method in your 12.2 database. Let’s begin by creating a table and explicitly […]

TCP RMEM Fault in Delphix Target on AWS

So you’ve deployed targets with Delphix on AWS and you receive the following error: