Modified Wednesday 18-06 07:50
Unix time (also known as POSIX time or Epoch time) is a system for describing instants in time. It's the number of milliseconds / second since a start date (generally Thursday, 1 January 1970) but if you start your own epoch, you may change it to get...
Modified Monday 16-06 01:34
The pivot is an dimensional data operation where rows and columns are interchanged. Pivot is also known as: Transpose in the linear algebra word Matrix in the Microsoft world Cross-tab This operation is typically performed by the visualization...
Modified Monday 16-06 01:31
Pivot statement in Oracle The column from the first select will be created with as prefix the value of the column in the for statement of the pivot statement. Unpivot can be used to see all column value in one column. You define the new column...
Modified Monday 16-06 07:56
A pipeline is a finite or infinite automata known as a stream) where: the data transition (pipe) from one state to another via a series of transformations (work) A pipeline creates a composition relationship. A pipeline is also known as: ...
Modified Monday 16-06 07:49
A stream is: a sequence of aninfinite cardinality (size) delivered atunknown time intervals. list In processing, a stream is a pipeline where the source cardinality is infinite (ie polled continuously to see if there is anything) Streams...
Modified Sunday 08-06 03:01
A (reduction|reduce) operation (also called a fold) is a functional programming function. Reduction operations are terminal operations. They takes a sequence of input elements and returns: a single summary result a collection or a map Example:...
Created Wednesday 05-03 01:45
A Mail eXchange (MX) is a smtp server that is responsible for : receiving emails for one or more domain and delivering them to a mail delivery agent (MDA) for final delivery The email servers IP are set in the DNS via the MX record. This is how...
Created Monday 03-02 09:04
The X.509 Public Key Infrastructure is a Public key infrastructure (PKI) that uses a hierarchical system of Certificate authorities that brings trust to the transactions by signing certificate. A Hierarchical PKI consists of: A certificate authority...
Always keep one hand firmly on data, Amos liked to say.
Data is what set psychology apart from philosophy, and physics from metaphysics.
Developing a data warehouse means assembling a lot of subsystems in order to create a whole and coherent data application.
Discovers the 34 Kimball Subsystems and drill down to discover them
Data processing has changed a lot since 1940 :) and luckily, we are not using punch card anymore.
Stream processing is becoming the norm in data integration task while batch processing stays the king in data analysis.
ENIAC, 1946The first fully electronic digital computer
Dimensional Data Modeling permits you to model a (hyper)cube and analyse a process through different perspective. You define dimensions, measures and metrics.
Most programs process some input to produce some output; that’s pretty much the definition of computing.
A Function is the basic block of all reusable code component. It is also becoming the central component of any serverless architecture.
Knowledge isn't free. You have to pay attention.
Computing Division at the Department of the Treasury, mid 1920s
The table format (known also as a relation) is the most important data structure used in data analysis. Did you know that its name originate from the medieval counting table ?
Education isn't something you can finish.