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 […]
Database
Oracle database
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 […]
Querying connected data in Graph databases with Neo4j
TL;DR; · Graph databases are ideal for query use cases with data with complex relationships and layers of connections · Its query language is fast, efficient and allows for retrieval of information at deeper levels of abstraction in the data · Neo4j is currently the most popular Graph database, and […]
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 […]
How to deploy InfluxDB in Azure using a VM service with dedicated storage
InfluxDB isn’t natively supported on Azure. This blog post will teach you how to deploy InfluxDB (or any other database) in a VM with a managed disk on the Azure platform. This will enable you to use this fast time-series database for your project. If the standard range of […]
ORA-31626, (Database-pump)-job does not exist
A short post about the ORA-31626 error. Found out a scheduled export- and import- job was broken in an Oracle Database. Error: ORA-31626: job does not exist. After checking the scheduled jobs I realized that it’s not the scheduled job, but the datapump-job (should have read the error more carefully – […]
June 23 2019, date of the SCN-bug
The what? I read about the SCN bug a few years ago (a wildly increasing value of the SCN till a certain limit has been reached ) , and took this for granted – most of it. Until recently a customer asked for help with a 9.2 database which had to […]
Getting started with Enterprise Modules’ ora_profile to install Oracle 18c
A couple of moths ago, Enterprise Modules announced the easy to start way of making use their Oracle modules, ora_profile. Recently their modules have been updated to support the on-premise release of Oracle 18c (18.3). In this post I’ll explain how to get started using Vagrant, VirtualBox and a little […]
Crash recovery of Oracle databases using Commvault
Some time ago I published an article about creating a RMAN backup using Commvault. See: https://technology.amis.nl/2018/03/01/creating-rman-backups-using-commvault/ . In this article I describe how to execute a crash recovery using Commvault. You need to do a crash recovery when you lost all your datafiles, redolog files, control files and spfile. For example […]
Oracle’s extended support – when is it free of charge
It’s such a simple, basic and old question I got from a colleague: “Do you have to pay for extended support?”. And if so, how much I have to pay for it. So basic and yet… always have to check again the waived support, what prices and where to find […]
Quickly setup a persistent React application
After having recently picked up the React framework, I figured I’d share how I quickly setup my projects to implement persistence. This way you spend minimal time setting up the skeleton of your application, letting you focus on adding functionality. This is done by combining a few tools. Let’s take […]
Quickly spinning up Docker Containers with baseline Oracle Database Setup – for performing automated tests
Here is a procedure for running an Oracle Database, preparing a baseline in objects (tables, stored procedures) and data, creating an image of that baseline and subsequently running containers based on that baseline image. Each container starts with a fresh setup. For running automated tests that require test data to […]
A DBA’s first steps in Jenkins
My Customer wanted an automated way to refresh an application database to a known state, to be done by non-technical personnel. As a DBA I know a lot of scripting, can build some small web interfaces, but why bother when there are ready available tools, like Jenkins. Jenkins is mostly […]
ORDS: Installation and Configuration
In my job as system administrator/DBA/integrator I was challenged to implement smoketesting using REST calls. Implementing REST in combination with WebLogic is pretty easy. But then we wanted to extend smoketesting to the database. For example we wanted to know if the database version and patch level were at the […]
Upgrade of Oracle Restart/SIHA from 11.2 to 12.2 fails with CRS-2415
We are in the process of upgrading our Oracle Clusters and SIHA/Restart systems to Oracle 12.2.0.1 The upgrade of the Grid-Infra home on a Oracle SIHA/Restart system from 11.2.0.4 to 12.2.0.1 fails when running rootupgrade.sh with error message: CRS-2415: Resource ‘ora.asm’ cannot be registered because its owner ‘root’ is not […]
Dbvisit Standby upgrade
Upgrading to Dbvisit Standby 8.0.x Dbvisit provides upgrade documentation which is detailed and in principle correct but only describes the upgrade process from the viewpoint of an installation on a single host. I upgraded Dbvisit Standby at a customer’s site with Dbvisit Standby in a running configuration with several hosts […]
How to fix Dataguard FAL server issues
One of my clients had an issue with their Dataguard setup, after having to move tables and rebuild indexes the transport to their standby databases failed. The standby databases complained about not being able to fetch archivelogs from the primary database. In this short blog I will explain what happened […]
Introducing Elastic Search NoSQL to Oracle SQL developers – comparing dozens of ElasticSearch and SQL operations (a bit like Rosetta)
Even for organizations with strong roots in relational databases such as Oracle RDBMS, there may be valuable opportunities for leveraging additional data sources, for example to support special (search) use cases. Elastic Search (Index) is one of those data stores that can add value – for example to provide powerfur […]
The Tale of the Ardent SpringCleaning Maniac (ASM)
or If you want to get rid of stuff, you can always do a good spring-cleaning. Or you can do what I do. Move. – Ellen DeGeneres In order to prepare for a network reorganization we needed to move our current Oracle Enterprise Manager machine into another network segment. So […]
Deploying Oracle OEM agents 13c on windows targets (2008 R2) while OMS is on Linux
Situation at customer’s site: OMS 13.2 on Oracle Linux, targets are Windows machines, and a bit ancient: Windows 2008 R2. How to deploy agents on those targets? Several methods are possible in theory. In this blog I’ll describe my efforts to determine what is really possible and what is efficient.
Upgrade OEM 12.1.0.5 OMS to OEM13.2
Despite the potential of Oracle Management Cloud, I’m a fan of Oracle Enterprise Manager, with its small imperfections. So when noticing a 12c Oracle Enterprise Manager on Linux, and targets on Windows, I took the challenge of modernizing the customer’s environment a bit. And the starting point , 12.1.0.5 for […]
Oracle REST Data Services (ORDS)
While preparing for writing an article about “Oracle API Platform Cloud Service” I wanted to quickly be able to generate example JSON payload’s based on some tables in the “HR’ schema. To achieve this, I came across “Oracle REST Data Services (ORDS)” and wanted to know more about it. In […]
Getting started with Oracle Database in a Docker container!
One of the benefits of using Docker is quick and easy provisioning. I wanted to find out first-hand if this could help me get an Oracle Enterprise Edition database quickly up and running for use in a development environment. Oracle provides Docker images for its Standard and Enterprise Edition database […]
10 reasons NOT to implement Blockchain now
A secure distributed ledger with smart contract capabilities not requiring a bank as an intermediary! Also a single source of truth with complete traceability. Definitely something we want! Blockchain technology promises to make this possible. Blockchain became famous through cryptocurrency like Bitcoin and Ethereum. The technology could also be considered […]
Oracle Open World; day 2 – highlights
At Monday Oracle Open World really starts. A whole lot of general sessions with announcements and strategic directions on product / service level. In this post I’ll try to summarize the highlights of this day. Quite hard, there are a whole lot of interesting sessions which overlap. Always the […]
Oracle Open World 2017; day 1 observations
Just a quick note about day 1 at Oracle Open World. This Sunday traditionally is filled with presentations of usergroups, customers and product management, and at the end of the day the welcome-keynote. In the presentations there’s not really exciting news, they will have to wait until the keynotes. But […]
The day before OOW17; infra expectations
Oracle Open World 2017 is starting tomorrow, and as a platinum partner of Oracle, we – AMIS Services – are obliged to keep us and our customers informed with the roadmap of Oracle products. And of course translate this to added business-value for our customers. In short: what to pick […]
R and the Oracle database: Using dplyr / dbplyr with ROracle on Windows 10
R uses data extensively. Data often resides in a database. In this blog I will describe installing and using dplyr, dbplyr and ROracle on Windows 10 to access data from an Oracle database and use it in R.
ODA X6-2M – How to create your own ACFS file system
In this post I will explain how to create your own ACFS file system (on the command line) that you can use to (temporarily) store data. So you have this brand new ODA X6-2M and need to create or migrate some databases to it. Thus you need space to store […]
Machine Learning in Oracle Database – Classification of Conference Abstracts based on Text Analysis
Machine Learning is hot. The ability to have an automated system predict, classify, recommend and even decide based on models derived from past experience is quite attractive. And with the number of obvious applications of machine learning – Netflix and Amazon recommendations, intelligent chat bots, license plate recognition in parking […]
AWS – Build your own Oracle Linux 7 AMI in the Cloud
I always like to know what is installed in the servers that I need to use for databases or Weblogic installs. Whether it is in the Oracle Cloud or in any other Cloud. One way to know is to build your own image that will be used to start your […]
Create a 12c physical standby database on ODA X5-2
ODA X5-2 simplifies and speeds up the creation of a 12c database quite considerably with oakcli. You can take advantage of this command by also using it in the creation of physical standby databases as I discovered when I had to setup Dataguard on as many as 5 production and […]
after 27+ years in Oracle land I am forced to patch sqlplus
When starting to use sqlplus 12.2 I noticed that my SQL prompt was not changing to what login.sql told it to be. This did not happen in sqlplus 12.1 or lower versions. Maybe this is a bug, maybe a new feature I thought. Behaviour in 12.2 of sqlplus indeed has […]
ETL using Oracle DBMS_HS_PASSTHROUGH and SQL Server
While I prefer a “loosely coupled architecture” for replication between Oracle and SQL Server, sometimes a direct (database) link cannot be avoided. By using DBMS_HS_PASSTHROUGH for data extraction the 2 other ETL processes (transformation and load) can be configured and administered with more flexibility, providing an almost acceptable level of […]
Oracle Database standard Geo Location Support using Locator (included in every edition!)
Many databases have native support for locations en geodata – and determining distance and closest locations (within a certain perimeter). Oracle Database has the [Graph and] Spatial Option – that supports even the most advanced and exotic forms of location related data querying (including multidimensional shapes and probably relativistic effects); […]
Quickest way to get going with Node.js and MongoDB – using the mongodb Node driver and a free MongoDB instance in the cloud with mLab
While preparing for a workshop on Node.js, I ran into the by far quickest way to get some a simple Node.js application running against a MongoDB database. I stumbled into mLab (https://mlab.com/) for database hosting. This company offers various plans for cloud based MongoDB environments – including a free plan […]
Golden Gate 12c and DIY Sequence Replication with PL/SQL
Recently, while migrating AIX 11gR2 Databases to Oracle Linux 12cR1 on an ODA X5-2, our setup of Sequence Replication by Oracle Golden Gate appeared to be faulty. The target side sequences were not automatically incremented. The problem came to light during the migration of acceptance databases, and under some time […]
Better track the Usage of Database Options and Management Packs, or it will cost you
So here it is Oracle announces a license audit, some urgency kicks in and this familiar but also really serious question comes down from management: “Are we using any unlicensed database features“. The seriousness is quite understandable, because if so, the company can look forward to some negotiations with Oracle […]
How I learned to appreciate MongoDB
Last week at our company we organized a session about NoSQL in general and MongoDB in particular, as you can read here. The MongoDB focus was presented by me and I would like to take you with me on my trip to actually appreciating the NoSQL database world (and MongoDB […]