This story is based on true events. It happened fairly recently. I was called into an organization that was experiencing performance and stability issues that affected mission critical processes. Every now and again, and increasingly frequently, their service bus stopped working. It appeared as if only a restart could get […]
Lucas Jellema
Lucas Jellema, active in IT (and with Oracle) since 1994. Oracle ACE Director and Oracle Developer Champion. Solution architect and developer on diverse areas including SQL, JavaScript, Kubernetes & Docker, Machine Learning, Java, SOA and microservices, events in various shapes and forms and many other things. Author of the Oracle Press book Oracle SOA Suite 12c Handbook. Frequent presenter on user groups and community events and conferences such as JavaOne, Oracle Code, CodeOne, NLJUG JFall and Oracle OpenWorld.
The Pipelined Pancake Party – demonstrating the Power of Parallelization and Pipelining in JavaScript with Promises and Asynchronous Generators
This article is an attempt to demonstrate the performance gains – and programming elegance – that is at our disposal with the advent of asynchronous generators in ES 2018 (JavaScript), for example in Node 10 and later. With asynchronous generators and Promises, we can implement parallel, asynchronous and pipelined processing […]
JavaScript Pipelining using Asynchronous Generators to implement Running Aggregates
As of ES 2018 (recent browsers or Node 10), JavaScript support asynchronous generators. Generators are functions that return a set of values, one value at a time. These values can be processed inside the code that invokes the generator immediately, as soon as they become available. There is no need […]
Jupyter Notebook for retrieving JSON data from REST APIs
If data is available from REST APIs, Jupyter Notebooks are a fine vehicle for retrieving that data and storing it in a meaningful, processable format. This article introduces an example of a such a dataset: Oracle OpenWorld 2018 was a conference that took place in October 2018 in San Francisco. […]
The Full Oracle OpenWorld and CodeOne 2018 Conference Session Catalog as JSON data set (for data science purposes)
Oracle OpenWorld and CodeOne 2018 are two co-located conferences that took place in October 2018. Some 2000 sessions presented by over 2500 presenters form the core of these conferences. Many details are known about each of the sessions and the speakers – from title, abstract, room (size), date and time, […]
JavaScript Generators – How functions return a stream of results, yielding one result at a time
It was through inspecting some Python code that relied quite heavily that I suddenly realized the beauty of the ES6 concept of generators and the yield keyword. A generator function does not return its result all at once but instead an iterator that can be read from, one value at […]
Newly released: Oracle Exadata X8-2 – bigger disks for saving money, expanding capacity
Earlier this month, Oracle announced the availability of the latest Exadata machine, the X8-2. As well as the option to swap in big 14 TB disks in older versions of Exadata that were shipped with far smaller disks, allowing these older systems to substantially increase there capacity. Our AMIS resident […]
Extremely convenient way to run free Oracle Database 18c on your laptop – or anywhere else – using Vagrant & Virtual Box
Oracle Database 18c XE (eXpress Edition) is the free community edition of the enterprise edition of Oracle Database. Oracle Database XE has almost all features of Oracle Database; however, it is limited in non-functional terms (2 CPUs, 2 GB memory, 12 GB data volume). Oracle is generous in the terms […]
Updating running Kubernetes resources from the kubectl commandline using the patch command
All too often I found myself editing Kubernetes resource definitions in the Kubernetes Dashboard. Modifying for example the type of a service. Typically I would git clone yaml files, run them in a single statement and then manually change a few details. After just the tiniest of search efforts, I […]
Running Apache Kafka on Minikube
I frequently want to demonstrate the working of Apache Kafka and/or provide colleagues and other audiences with an environment for a workshop that involves Apache Kafka. I have been struggling to find a good way to get Kafka to function properly on Minikube – the standalone, single node Kubernetes cluster […]
Serverless Node Function on Oracle Functions runs periodically to produce CSV report on Oracle ObjectStorage from data in ElasticSearch
This article highlights a use case implementation I recently implemented (for a demo session) leveraging Oracle Functions as well as OKE (Oracle Kubernetes Engine), Object Storage and Elastic Search. I will briefly touch upon some of the interesting aspects of implementing this case. The code for the function and […]
Invoke an Oracle Function on Oracle Cloud Infrastructure from a Node application
Oracle Functions is currently in limited preview and is expected to soon reach wider availability. Rolando Carrasco did this write up on Medium about his first experiences with Oracle Functions. Oracle Functions is a managed PaaS service, based on Project Fn. It supports a serverless architecture with light weight functions […]
Save File to Oracle Cloud Infrastructure Object Storage from Node through REST API
Oracle Cloud Infrastructure Object Storage is a public cloud service for storing data to which you need fast, immediate, and frequent access. As Oracle states: “The Oracle Cloud Infrastructure Object Storage service is an internet-scale, high-performance storage platform that offers reliable and cost-efficient data durability. The Object Storage service can […]
Exposing Kubernetes Services to the internet using Traefik Ingress Controller
Three services have been deployed to my Kubernetes cluster running on a public cloud environment. These services expose port for three underlying Pods and six or so containers. The service make the Pods accessible within the cluster – but not to the outside world, the public internet. For a […]
Moving message threads to different group using the Yammer API
At AMIS we are quite happy users of Microsoft Yammer. Days with 10 or more messages are no exception and since December 2009, we have assembled quite a history of over 8000 message threads. Because we have joined the Conclusion eco system and we will now share a Yammer Network […]
Building a Conference Session Agenda with Oracle APEX – notes on Pivot, Modal Popup and jQuery
AMIS is part of the Conclusion ecosystem of over 20 companies, each with their own specialty and identity. Several times per year, we organize Conclusion on Stage – a conference that spans across the ecosystem. Presenters from most companies under the Conclusion umbrella submit session proposals. Close to 30 sessions […]
Running an enriched Jupyter Notebook runtime in a Docker Container – locally or cloud side
Data Wrangling is a crucial stage in the data science workflow. Or in any workflow that starts from raw data and hopes to achieve business insight – and perhaps ready to run well trained machine learning models. Data wrangling encompasses various steps and activities -from gathering raw data, exploring, validating, […]
Some neat APEX tricks while building a Session Like application for our Conference
AMIS is part of the Conclusion ecosystem of over 20 companies, each with their own specialty and identity. Several times per year, we organize Conclusion on Stage – a conference that spans across the ecosystem. Presenters from most companies under the Conclusion umbrella submit session proposals. Close to 30 sessions […]
Creating a Katacoda scenario – A Tailor Made On Line Tutorial Environment – for example for Jupyter Notebook
Learn new technologies using real environments – right in your browser. Katacoda is an online platform that offers hundreds of scenarios and sandbox environments to learn about and play with different kinds of technologies. Katacoda is special in that it not only offers the handson instructions – it also provides […]
Some Notes on my small steps with Oracle APEX
In this article, I will share some of my personal findings and discoveries as I start out building a small APEX application. No experienced developer is likely to learn anything from this article – but first timers like me could perhaps benefit from my findings. Some of the challenges I […]
Oracle Analytics Cloud – Data Flow to produce a Date Value and Timeline to Visualize the time related data
In two earlier articles on Oracle Analytics Cloud I have introduced the Oracle OpenWorld 2018 Session Catalog Data Set (First steps with Oracle Analytics Cloud – Gather, Explore, Wrangle, Visualize and Creating a Data Flow in Oracle Analytics Cloud to enriching with Geo Encoding to Map visualization of data) . […]
Quickly developing and hosting your friendly neighbourhood application – for free using … Oracle APEX
My challenge: my wife wants to set up a system for some of our friends and relatives to let each other know about appliances and things they can share as well as objects they offer up [because they plan to get rid of them]. The specifications are fairly straightforward: users […]
Creating a Data Flow in Oracle Analytics Cloud to enriching with Geo Encoding to Map visualization of data
In this article, I will show how I have created a Data Flow in Oracle Analytics Cloud to enrich a data set with geocoding data from a different data set, in order to be able to create a map based visualization of data. More specifically: in a previous article I […]
First steps with Oracle Analytics Cloud – Gather, Explore, Wrangle, Visualize
Data analytics is what turns data into business value. Oracle has a long history in Data Analytics – from Oracle Discoverer and its predecessors such as Data Browser through OBI EE and Endeca to several cloud services. Oracle Analytics Cloud is the strategic offering to adopt going forward – not […]
Changing views on integration – from Enterprise Service Bus to API Gateway, Serverless and iPaaS
If your tool is a hammer, every problem looks like a nail. Many of us have seen situations where this tunnel vision over time took hold. And for many of us involved in integration, this also has happened. In this article I want to briefly draw your attention to changing […]
Expose Docker Container services on the Internet using the ngrok docker image
The challenge: you are running a service, API or web application in a Docker container, locally on your laptop or in a cloud based VM or container platform. You would like to provide access to external consumers – yourself on your smart phone, a piece of code running in a […]
Don’t ask what you can do for documentation – ask what documentation can do for you! (a top down perspective on documentation)
How much documentation is enough documentation? What are the requirements in the definition of done regarding documentation? Cannot simply all code be self-documenting? These are common questions in DevOps, Scrum and other type of software development teams. Typically bottom up discussions among software developers at the time of developing the […]
Finding the shortest path from Country A to Country B – using Neo4J and Node
Graph Databases are good at recording nodes and edges – and even more at performing queries that traverse the edges. Some challenges can be dealt with in Graph Databases far more elegantly and efficiently than for example in relational databases using traditional SQL. As simple example, this article will create […]
Session Catalog for Oracle OpenWorld & CodeOne 2018 in JSON files
The Oracle OpenWorld and CodeOne 2018 conferences took place in the last week of October 2018. Together, over 1500 sessions took place. The session catalog with details for all sessions is accessible at https://events.rainfocus.com/widget/oracle/oow18/catalogcodeone18 – at least at the time of writing. The session information includes title and abstract, track, […]
First steps with Oracle Self Service Integration Cloud
An important part of enabling optimal use of SaaS applications is integrating various functions in said applications. Events in one application need to have an effect in others. From simple practical matters such as “send an email when a specific type of file was uploaded into a certain Dropbox or […]
Internet Intelligence – Checking on the accessibility of your web application from Anywhere in the world – for free with Oracle Cloud Infrastructure
A valuable capability that organizations using Oracle Cloud Infrastructure have available is internet intelligence. This capability allows you to monitor the health and accessibility of your web site’s or web application’s host – from over 30 locations across the world. You enter the IP address of the host and the […]
Building a Conference Session Recommendation engine using Neo4J Graph Database
This article describes a use case for which a traditional SQL-powered relational database approach can provide a solution – but for which that traditional approach is not the optimal solution. SQL is jack of all trades – you can make it do almost anything you need. And therefore it is […]
CQRS through Twitter – more fun than meaning
As part of my 50 Shades of Data presentation, I talk about CQRS – Command Query Responsibility Segregation. The idea that you can have one or more read only data stores with data replicated from the master store where all data manipulation (commands) take place. In a different presentation, I […]
From locally running Node application to Cloud based Kubernetes Deployment
In this article I will discuss the steps I had to go through in order to take my locally running Node application – with various hard coded and sometimes secret values – and deploy it on a cloud based Kubernetes cluster. I will discuss the containerization of the application, the […]
Oracle SaaS – Business Applications in the Cloud – as of Oracle OpenWorld 2018
Oracle has two main pillars on which its (future) business rests – dixit Larry Ellison: Oracle Cloud Infrastructure (including the Autonomous Database) and SaaS. In this article, I will relate some of the key announcement from Oracle regarding the business applications. It is useful to realize that Oracle’s portfolio of […]
Oracle APEX: the low-code and low-cost application middle tier
Oracle APEX is a low code application development framework. It can be used free of charge – either as part of an existing Oracle Database license or running in the free Oracle Database 18c XE product. An Oracle APEX application should be considered a three-tier application – consisting of a […]
Quick Start with Eclipse Che – Browser based IDE, running on Docker
One of the nice discoveries I made last week during CodeOne 2018 was Eclipse Che. This is a browser based polyglot IDE that runs in a Docker container – either locally, on a central server or in the cloud, on a stand alone Docker engine, a Kubernetes or an OpenShift […]
Querying and Publishing Kafka Events from Oracle Database SQL and PL/SQL
One of the session at CodeOne 2018 discussed an upcoming feature for Oracle Database – supported in Release 12.2 and up – that would allow developers to consume Kafka events directly from SQL and PL/SQL and – at a late stage – also publish events from within the database straight […]
Rapid generation of Oracle DDL scripts for Tables, PL/SQL APIs, Sample Data
Yesterday, at the Oracle ACE Directors Product Briefing, I received a gift. It is called QuickSQL. And it is a free online service that generates SQL DDL and DML scripts. The gift in this case was the knowledge about this service – I was not aware of it. Go to […]
Oracle Cloud Infrastructure CLI Scripts for preparing for OKE Cluster Provisioning
In order to provision a Kubernetes cluster on Oracle Cloud Infrastructure, you need to prepare the OCI tenancy and create a compartment with appropriate network configuration and associated resources. All set up can be performed through the console – but this is quite tedious, error prone and outright stupid if […]