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June 2018 Limited Printed Oracle Security Training Manuals for Sale

Over the last year or so we have offered for sale left over printed manuals from some of our training courses. Normally we only print the manuals for classes that we organise for in person training such as the classes....[Read More]

Posted by Pete On 03/06/18 At 01:47 PM

Oracle Security Training In York, UK, 2018

I have just updated our public training dates page to add two new dates for Oracle Security training classes that I will be running here in York, UK. We now have 4 dates covering three available classes. These are as....[Read More]

Posted by Pete On 02/06/18 At 06:54 PM

Measure the impact of DRBD on your PostgreSQL database thanks to pgio (the SLOB method for PostgreSQL)

You might want to replicate a PostgreSQL database thanks to DRBD. In this case you should measure the impact of your DRBD setup, especially if you plan to use DRBD in sync mode. As I am a lucky beta tester of pgio (the SLOB method for PostgreSQL), let’s use it to measure the impact.

DRBD configuration

The purpose of this post is not to explain how to set up DRBD. The DRBD configuration that will be used in this post is the following:

  • Primary host: ubdrbd1
  • Secondary host: ubdrbd2


Installing MAMP to play with PHP, MySQL and OpenFlights

You may wonder what I’m doing with those technologies that are completely different from what I usually do. I’ll detail in a future blog post but the idea is giving a short introduction to databases to students at, a coding academy for refugees in Switzerland. They install MAMP (My Apache – MySQL – PHP) during their curriculum for website development, and then I’ll use this environment to teach data modeling and SQL basics. Thus, I’ve to look at MAMP, PHP and MySQL for the first time… And I decided to load the OpenFlights open data to play with.
That explains the title.

Friday Philosophy – Despair of the Dyslexic Developer and Your Help Please

Like a surprisingly large number of people, I’m dyslexic. I’ve mentioned this before, describing how I found out I was dyslexic and also how I think it is sometimes used as an odd sort-of badge of distinction. I am mildly dyslexic, the letters do not try to “merge or run away” from my eye, if I hit a large word I am unfamiliar with I can visually chop it up and get through it. But that is just me. So, today, I want to ask you all, if you are a dyslexic developer or know one, are there any steps you have taken to reduce the impact?

SQLcl connect target depends on previous connection

I thought it was a bug for two reasons: first, because I don’t like that my connect destination depends on the context, and then because it is a different behavior than in SQL*Plus. But finally, it is the correct behavior, and the 100% compatibility with SQL*Plus is expected only when SET CLASSIC=ON. And as I was surprised, and I think it can be dangerous, here is a blog post about it. Basically, be very careful if you are connected with a service name and you want to connect locally.

Basically, if you attended my demo about ‘From Transportable Tablespaces to Pluggable Databases’, where I switch between different instances you may have seen that I had to run ‘connect / as sysdba’ two times because the first one failed with invalid username/password

SQL> connect scott/tiger@//localhost/PDB1
SQL> connect / as sysdba
URL = jdbc:oracle:oci8:@//localhost/PDB1

Index Bouncy Scan 4

There’s always another hurdle to overcome. After I’d finished writing up the “index bouncy scan” as an efficient probing mechanism to find the combinations of the first two columns (both declared not null) of a very large index a follow-up question appeared almost immediately: “what if it’s a partitioned index”.