Using the Secure External Password store with sqlcl

Sometimes it is necessary to invoke a SQL script in bash or otherwise in an unattended way. SQLcl has become my tool of choice because it’s really lightweight and can do a lot. If you haven’t worked with it yet, you really should give it a go.

So how does one go about invoking SQL scripts from the command line these days? There’s an age-old problem with unattended execution: how do you authenticate against the (more...)

Oracle Instant Client RPM installation where to find things

Last week I blogged about the option to install Oracle’s Instant Client via the public YUM repository. If you go ahead and try this, there is one thing you will undoubtedly notice: file locations are rather unusual if you have worked with Oracle for a while. This is true at least for the 19c Instant Client, it might be similar for older releases although I didn’t check. I’d like to thank @oraclebase for prompting me (more...)

Installing the Oracle Instant Client RPM via YUM on Oracle Linux 7

Many applications require Oracle’s instant client to enable connectivity with the database. In the past, getting hold of the instant client required you to agree to the license agreement before you could download the software. For a little while now, Oracle offers a YUM repository with the instant client RPMs. There are a couple of announcements to that effect, for example on Oracle’s Linux blog. It’s a great step ahead for usability, and I really (more...)

Learning about Kubernetes: JDBC database connectivity to an Oracle database

In the past few months I have spent some time trying to better understand Kubernetes and how application developers can make use of it in the context of the Oracle database. In this post I’m sharing what I learned along that way. Please be careful: this is very much a moving target, and I wouldn’t call myself an expert in the field. If you find anything in this post that could be done differently/better, please (more...)

Ansible tips’n’tricks: provision multiple machines in parallel with Vagrant and Ansible

Vagrant is a great tool that I’m regularly using for building playground environments on my laptop. I recently came across a slight inconvenience with Vagrant’s Virtualbox provider: occasionally I would like to spin up a Data Guard environment and provision both VMs in parallel to save time. Sadly you can’t bring up multiple machines in parallel using the VirtualBox provisioner according to the documentation . This was true as of April 11 2019 and might change (more...)

Ansible tips’n’tricks: testing and debugging Ansible scripts using Vagrant

At last year’s UKOUG I presented about Vagrant and how to use this great piece of software to test and debug Ansible scripts easily. Back then in December I promised a write-up, but for various reasons only now got around to finishing it.

Vagrant’s Ansible Provisioner

Vagrant offers two different Ansible provisioners: “ansible” and “ansible_local”. The “ansible” provisioner depends on a local Ansible installation, on the host. If this isn’t feasible, you can use “ansible_local” (more...)

Using dbca to create a physical standby database

While investigating new options I discovered with dbca for the previous article I noticed that it’s now possible to use Oracle’s Database Creation Assistant (dbca) to create a physical standby database using the -createDuplicateDB flag.

I wanted to know how easily this can be done on my Oracle 18.5.0 system. I have 2 VMs, server3 and server4 running Oracle Linux 7.6. I created the primary database on server3. The database name is (more...)

dbca now makes it easy to configure OMF on file systems

Up until – and including – Oracle 12.1 I always found it not-quite-so-straight-forward to create a new database using Database Creation Assistant (dbca) and configure it with Oracle Managed Files (OMF) on a file system in silent mode. I really like to use OMF in my lab databases as it saves me a lot of typing. I have also seen Oracle databases deployed in the cloud on file systems without ASM. So I was quite happy (more...)

Ansible tips’n’tricks: understanding your Ansible configuration

When writing automation scripts I tend to use a local Ansible configuration file. This has certain advantages for me, such as including it in a version control system (VCS). It also is a valid option for developers without access to the global configuration file installed by the package manager. And more convenient to use than setting environment variables.

WARNING: There are some very important security considerations though, which you must be aware of before using (more...)

Oracle Linux 7 and a new YUM configuration since January 2019

For quite some time I used to have a configuration file /etc/yum.repos.d/public-yum-ol7.repo managing my package sources in lab VMs. Today I noticed that this configuration file is deprecated, and has been replaced by a new model. This is explained in the Oracle Linux 7 administrator guide and a few other sources I totally missed. I thought I’d show you the full story in this post before I go and change all my (more...)