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April 2017

Adding support for Edition Based Redefinition for PROMISES_NINJA

As part of another project, where I need to support the Edition Based Redefinition feature, I needed to add support inside the promise class for the dbms_scheduler job_class parameter. The job_class parameter can point to a service, and a service can be assigned a default edition to run in. This allows me to execute code inside a promise, and automatically support any edition that has been created in the database, as well as assigned to a service.

How to install the semaphore UI for running ansible

This blogpost is about how to install the semaphore user-interface for running ansible. Ansible is an automation language for automating IT infrastructures. It consists of command-line executables (ansible, ansible-playbook for example) that can run a single task using a module (using the ansible executable), or can run multiple tasks using multiple modules in order to perform more complex setup requirements (using the ansible-playbook executable). The downside of running IT tasks via the command-line is that there is no logging by default, unless someone decides to save the standard out to a file, which, if multiple people start doing that by hand will probably lead to a huge collection of text files which are hard to navigate. Also, when tasks are run via a common place, it’s an all or nothing situation: everybody has access to all the scripts, or to nothing.

SQLTXPLAIN vs SQLd360, differences and similarities

When talking tools to help with SQL Tuning the question on SQLTXPLAIN vs SQLd360 comes out very often. “What’s the difference?”, “Which one should I use?”, “Why another tool?” are probably the top ones </p />
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Delivering Migration Projects on Time

I did a couple great sessions yesterday for the awesome Dallas Oracle User Group, (DOUG.)  It was the first time I did my thought leadership piece on Making Sense of the Cloud and it was a great talk, with some incredible questions from the DOUG attendees!

Passing Single Quotes in DBMS Assert Package

Today, while describing the usefulness of DBMS_ASSERT package to prevent SQL and PL/SQL Injection attacks someone asked me how to pass a string with single quotes successfully to this package.

First, if you don't know what DBMS_Assert is or why you should know about it, check out the presentation on this blogpost. In summary, the ENQUOTE_LITERAL() function strips off all the single quotes from around the string and replace with just a pair of single quotes, which makes it a clean, uninjected string. Here is an example of a string called Joe Pizza.

SQL> select dbms_assert.enquote_literal('Joe Pizza')  from dual;

DBMS_ASSERT.ENQUOTE_LITERAL('JOEPIZZA')

Preventing SQL and PL/SQL Attacks at New York Meetup

Thank you all for attending my session at New York Meetup and New York Oracle User Group Spring Meeting in New York City on April 27th. I am truly honored by your presence, and especially for the questions.

You can download the presentation here And the scripts I used for the demos here. As always, I will appreciate your feedback either via comments here, or on social media or emails.

Twitter @ArupNanda
Facebook.com/ArupKNanda

Simple script to remove system-generated column groups

There seem to be a lot of interest (at least on Twitter and at OUG conferences) about Oracle recommendation to install a couple patches on top of 12.1.0.2, in order to emulate 12.2 behavior when it comes to SQL Plan Directives (details here, need MOS account).
One of the things SQL Plan Directives do is trigger column groups (CG) creation.

Quiz Night

If this is the closing section of thetkprof output from the trace file of a single end-user session that has a performance problem, what’s the most obvious deduction you can make about the cause of the problem, and what sort of action would you take next ?

Listener and Virtual IP

When you configure a standby database, you want the application to transparently connect to the primary database, wherever it is. That’s the role of Transparent Application Failover, but this requires configuration on the client side. If you can’t configure TAF, you can use a virtual IP address. But then the question is how to configure the listener.ora to handle connections to this VIP.

Don’t worry, if you configured everything as recommended, with the hostname declared in /etc/hosts, and listener.ora referencing this host name, then you can simply ignore the VIP for your configuration. The reason is that when the host specified in the listener.ora resolves to the same IP address as the hostname of the server, then Oracle listener binds the port on all interfaces, and this includes the VIP.

DOAG Exaday 2017: a preview

I am quite excited to have been accepted to speak at the upcoming DOAG Exaday taking place June 20 in Frankfurt. It is the third time I have been lucky enough to present at the event, having spoken both in Frankfurt in Hamburg in previous years.

As you can probably imagine by looking at this weblog, I am a great supporter of the Oracle Engineered Systems community. My interest is not limited to Germany: I still remember the many great meetings in London in the context of UKOUG’s Exadays. I am also very lucky to work for @enkitec where we have been sharing real-world experience at E4 for years and will do so again in June this year.