20. 11. 2019.

How to install Oracle SQL Developer Data Modeler 19.2 on Ubuntu 18.04 LTS

One of the main reasons why I choose Fedora as my main operating system is due to Oracle dependency on rpm package manager and because of the bleeding edge of Open Source technology like the latest kernel version, compilers, new drivers etc. Unfortunately, very often bleeding edge means bloody edge as I have to spend […]

07. 10. 2019.

Installing Oracle database on Amazon AWS

Although you can use AWS RDS service which offers PaaS architectural model of running Oracle database on top of AWS Cloud, due to many limitations (installation type, options selected etc.), many enterprises still prefer using IaaS model, where such restrictions does not exist (e.g. you can install Enterprise Edition of Oracle database, RAC, Data Guard […]

02. 09. 2019.

Cloning larger bootable HDD into a smaller one

This article is triggered by the real case when I have not only to clone larger (external) disk into a smaller one, but to keep cloned disk bootable as it’s source. The article is mainly reminder what I need to do, as I frequently need to prepare PoC (Proof of Concept) that requires to run […]

28. 08. 2019.

Installing Ubuntu on an external bootable HDD

In case you need to experiment with different OS from one that you already have installed, but don’t want to take a dual-boot approach to avoid possible corruption of your main disk, then keep reading this article – Installing Ubuntu on an external bootable HDD.   Although it is possible to run Linux along with […]

22. 07. 2019.

Oracle database benchmarking by using CALIBRATE_IO

CALIBRATE_IO is yet another popular database simulation/stress test utility, mainly used to perform IO benchmarks.   Procedure, that is part of DBMS_RESOURCE_MANAGER package, will generate read-only workload made up of 1 MB of random of I/Os to the database to determine the maximum number of IOPS and MB per second. You can save the following […]

17. 07. 2019.

Implement High Performance Computing tools to test cluster stability

There are many benchmark testing tools that are focusing on various fields of a cluster like computing capabilities, energy efficiency, data & storage, memory etc. In this article I’m going to use Somberero – High Performance Computing tool suitable to run a test against your home PC or cluster of supercomputers. Sombrero is particularly useful […]

07. 07. 2019.

bash history search on steroids

Today there are several hundreds (maybe even thousands) programming languages around (not to mention Domain Specific languages), but bash, with all its shortcoming, is still native language of all *nix servers around. With today’s choices you might not want to create scripts in bash, for one liners bash is still in. In this article I […]

22. 05. 2019.

Troubleshooting boot issues in Linux – part 2

This article is an extension of the following one:   https://www.josip-pojatina.com/en/troubleshooting-boot-issues-in-linux/   where I’ve added part that describes situation when you cannot boot your system at all, but Linux distro image DVD is still not required.   To be able to troubleshoot further what is going on, you need to start your Linux server machine. […]

07. 05. 2019.

Troubleshooting boot issues in Linux

After I’ve installed one older application on Oracle Linux 7, next time I’ve tried to start it, the server refused to start. Fortunately it’s Linux, so there are many ways to recover it. The following approach should work for most cases. Try to boot into the terminal mode by editing Grub In case that previous […]

23. 03. 2019.

How to install CUDA Toolkit on Ubuntu 18.04 LTS

This is the second part of CUDA-GPU tuning series where I’ll explain how to install CUDA Toolkit 10.1 on Ubuntu 18.04 LTS. In the first part I’ve described how to properly install nVidia drivers on Ubuntu 18.04 LTS Detailed instructions can be found on any of these two pages: https://www.josip-pojatina.com/en/how-to-install-nvidia-driver-on-ubuntu-18-04-lts/ or https://www.performatune.com/en/how-to-install-nvidia-driver-on-ubuntu-18-04-lts/   Although you […]