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toon_hotsos_revisited

Hotsos Revisited 2013 – Presentatie materiaal

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1 month ago
by Marco Gralike in , , , , , , , ,

Hierbij nog dank voor allen die aanwezig waren bij de weer gevulde, informatieve & gezellige avond tijdens “Hotsos Revisited 2013″.

Wij presentatoren hebben genoten van het ambiance. Hier ook nog voor degenen die graag het nog een keer willen nalezen het presentatie materiaal van Toon, Jacco, Gerwin, Frits en mij…

Presentatie materiaal in alfabetische volgorde:

Hopelijk zien we jullie misschien weer tijdens de Masterclass over Oracle storage “Understanding storage met Oracle ACE Director James Morle” en anders hopelijk tot een volgende keer bij AMIS in Nieuwegein.

Marco

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ADF DVT Speed Date: Interactive Bubble Graph

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2 months ago
by Frank Houweling in , , , , , ,

Recently the ADF SIG at AMIS organized an ADF DVT Speed Date. During this speed date six AMIS consultants presented their favorite DVT Component. In a series of blogposts we share the knowledge and findings. In this post you get introduced to the ADF DVT bubble graph. I will also show you how to make it interactive by clicking on the bubbles. The ability to make a graph interactive can be very usefull.

In the following bubble graph that we are going to create, the Life expectancy (y-axis), income a year (x-axis) and the population (bubble size) is shown. This in steps of 10 years, for the last 50 years (1970, 1980, 1990, 20000 and 2010). So for each country 5 bubbles are shown. The location of the bubble has a meaning; for example in Japan (grey) the life expectancy is the highest and in Pakistan the lowest (green). -Have developing countries moved forward their income? -Do they have longer lifes than 10, 20, 30, 40 or 50 years ago? A picture says more than thousand words – you can see it immediately in the graph.

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Oracle SQL – Finding free adjacent seats in an airplane, using Subquery Factoring, Analytical Functions (LISTAGG and LEAD), Outer Join, PIVOT and good old INSTR

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2 months ago
by Lucas Jellema in ,

Using Oracle SQL to resolve meaningful and slightly less serious challenges is one of my favorite (semi-)professional pastimes. In the last two weeks, I have been presenting on various topics including Oracle SQL to audiences in six cities all across India as part of the OTN Yathra 2013. These presentations and the interaction with the attendees on the various capabilities of SQL have inspired me in several ways. One of the outcomes is this article – also inspired by the fairly long journey home and the many flights within India. In this article I will use several powerful options in Oracle SQL to resolve some simple to ask questions. The SQL functions I am using include:

  • Insert with Multiple Subqueries
  • Insert generating some random data
  • LISTAGG for aggregating strings
  • LEAD to produce the result for one row using information from the next
  • PIVOT to present the data in a matrix format

The statements are straightforward (relatively), the data model is simple. You will like it.

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Oracle SQL – spotting combinations that occur and those that do not – demonstrating Analytical Functions, Outer Join and SubQuery Factoring

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2 months ago
by Lucas Jellema in ,

The challenge in this article is a simple one. I have a table with records (duh!) and each record describes the occurrence of a certain payload. In this example the payload will be a color. Every record also has a sequence number to indicate well, when it appeared relative to the other observations. A subset of the data would look like this:

The challenges I will discuss in this article are simple:

  • which sequences of three color observations occur in the data set
  • how often do these sequences of three occur (give me the top 3 sequences)
  • given the colors that have been observed, which combinations of three can be created
  • which possible combinations (or color sequences of three colors) have not been observed at all

Using Oracle SQL features such as Analytical Functions, Outer Join and Subquery Factoring – these questions become very easy to answer.

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How Oracle Database uses internal locks to make statement level constraint validation robust at the transaction level

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2 months ago
by Lucas Jellema in ,

Data Constraints are essential in protecting the integrity of the data in any relational database. The Oracle Database provides four types of declarative constraints that help implement various types of data rules. These are: Primary Key, Unique Key, Foreign Key and Check Constraint. Although these constraints can be configured to be enforced at transaction time (when the transaction is committed) by setting them to be deferred, the default behavior of the constraints is to enforce the integrity rule at statement level. That means that when a transaction performs multiple DML statements, the constraints are validated during execution of the statement. When the statement is done, the integrity is ensured (otherwise the statement would have failed) and additional statements can be executed.

In the multi session environment that is the Oracle Database, you could be wondering – as was I – how the Oracle Database ensures that other sessions executing DML operations can not undermine the integrity of the data touched by the current transaction. And how it can do so without needlessly preventing other sessions to perform data manipulation using various forms of locking.

It turns out that More >

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OTN Yathra 2013 – Spreading the story of Oracle across India – (Half time)

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3 months ago
by Lucas Jellema in

The OTN Yathra 2013 is taking a group of Oracle ACE Directors across all of India. From New Delhi to Chennai and four cities in between, this AIOUG (All India Oracle User Group) enterprise brings high level Oracle technology content to Oracle developers and database administrators throughout India.

The tour is sponsored by OTN – the Oracle Technoloy Network – and put together by Murali Vallath. At the time of writing, the Yathra has hit Pune, which means that after today we are half way through with Bangalore, Hyderabad and Chennai still to come.

And so far it has been a great experience, for the presenters and I believe for the attendees as well. From the University sites in New Delhi and Mumbai to the ultra modern office of Oracle Financial Services in Pune, our hosts have been wonderful and the audiences appreciative. It is certainly a great pleasure to be in this traveling circus.

The OTN Yathra has at the core speakers on various areas of expertise:

  • Edward Roske, USA on ESS Base, Hyperion and many other components in the Oracle Business Intelligence portfolio
  • Murali Vallath, India/USA on Database and RAC
  • Hans Forbrich, Canada on Oracle Linux, LDAP, Database and several More >
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