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 […]

23. 09. 2019.

Running Cloud within your Data Center on-premises

Of the 350 companies surveyed, 74% had moved an application into the public cloud, and then for a variety of reasons and circumstances, decided to move it back into their on-premises or private cloud infrastructure.   More you can find on the following link: https://www.fortinet.com/blog/industry-trends/ihs-markit-fortinet-cloud-report-insights.html?utm_source=social&utm_medium=twitter-org&utm_campaign=sprinklr&utm_term=Corporate%2CThought+Leadership   The first interesting finding is the growing sense that […]

11. 09. 2019.

Who else could read your private & sensitive data stored in Cloud?

ZDNet has recently published an interesting article related to Public Cloud and GDPR related data jurisdiction – US Cloud act. Article is about digital sovereignty as more than half of European business with over 1,000 employees are using a public cloud platform, mostly AWS & Azure that dominate the Cloud market, IBM that dominates hybrid-cloud […]

23. 08. 2019.

Oracle single-threaded CPU performance reference test, native compilation and performance improvement after upgrading your database

In this article I’ll provide a very simple way of how to test Oracle CPU single-thread performance.   Apart from that, I’ll cover performance boost you might expect when upgrading your server (especially CPU), expected performance boost when performing simple upgrade of the Oracle database, and issues and workarounds related to native compilation of PL/SQL […]

14. 08. 2019.

Cloud – shared responsibility model, SaaS & Cloud security best practice

As industry is moving fast toward Cloud adoption, although not new (Amazon AWS platform was launched in July 2002), it’s no surprise that Cloud is still one of the hottest technologies around. Started with Simple Queue Service (first AWS service launched in November 2004), Cloud today is far away from the simple file sharing service. […]

28. 07. 2019.

How to quickly perform REST API performance test

REST API interface is dominant way of machine-to machine communication because of its flexibility, performance, simplicity and lightweight.   Recently I had to perform a quick performance test to check if response time of one application is in line with SLA (Service Level Agreement). Such performance tests are particularly important in case of SaaS architecture […]

24. 07. 2019.

SaaS related GDPR, security and architectural issues

In the age of Cloud computing one of the most important challenges is how to keep security while moving your enterprise apps in the Cloud. In this article I’m going to explain what challenges you might experience if you are blindly follow all hypes from the tech industry. Today enterprises are under tremendous pressure to […]

26. 02. 2019.

Impact of the JVM Garbage Collector on the realistic workload

At the last regional Java and Open Source conference where I held the presentation named: “Java Mission Control now in OpenJDK – best practice”, several questions have been raised about a way of testing JEE apps, influence of a GC (Garbage Collector) on the overall performance, new GC engines etc. With OpenJDK 11 we have […]

19. 02. 2019.

Bulk collect and memory limits

We all know that for bulk collect PL/SQL operation it’s important to keep the memory consumption under control. For that reason all bulk collect operations should be combined with a LIMIT clause like in the following code fragment: Setting the limit to process only 10K records in bulk is does not impress me in a […]

28. 01. 2019.

Easy way to create Virtualbox VM’s internal network

Virtualbox is a very popular hypervisor which allows you to run guest virtual machines like Windows, Linux, BSD, Solaris etc. For various purposes you might want to combine several virtual machines into one network. In this post I’ll describe the easiest way of how to do that, which is good enough for most of the […]