An ETL process includes various ETL activities, such as filtering, aggregating, checking for null values, etc., which can be represented by the constraint functions and transforming operations defined in previous section. However, the activities cannot exist in an ETL process independently; they must be organized in certain order that is specified in an ETL task of the ETL process. We think tha...

This work presents Entropy Guided Transformation Learning (ETL), a new machine learning algorithm for classification tasks. It generalizes Transformation Based Learning (TBL) by automatically solving the TBL bottleneck: the construction of good template sets. We also present ETL Committee, an ensemble method that uses ETL as the base learner. The main advantage of ETL is its easy applicability ...

Extraction, Transformation and Loading (ETL) are the major functionalities in data warehouse (DW) solutions. Lack of component distribution and interoperability is a gap that leads to many problems in the ETL domain, because these ETL components are tightly-coupled in the current ETL framework. Furthermore, complexity of components extensibility is another gap in the ETL area, because of the sa...

The ultrastructural functions of the electron-dense glycopeptidolipid-containing outermost layer (OL), the arabinogalactan-mycolic acid-containing electron-transparent layer (ETL), and the electron-dense peptidoglycan layer (PGL) of the mycobacterial cell wall in septal growth and constriction are not clear. Therefore, using transmission electron microscopy, we studied the participation of the ...

Extraction, Transformation and Loading (ETL) represent a big portion of a data warehouse project. Complexity of components extensibility is a main problem in the ETL area, because ETL components are tightly-coupled to each others in the current ETL framework. The missing extensibility feature causes impediments to add new components to the current ETL framework; to meet special business needs. ...

ETL process evolution is investigated below. A model-driven approach to templates and ETL process evolution problem is developed. We suppose that the ETL process evolution problem is mainly a problem of a low abstraction level. So the definition of ETL process based on a conceptual model is a principal step towards effective ETL evolution. Our approach seems to be scalable, robust and simpler i...

Extraction–Transform–Load (ETL) processes comprise complex data workflows, which are responsible for the maintenance of a Data Warehouse. A plethora of ETL tools is currently available constituting a multi-million dollar market. Each ETL tool uses its own technique for the design and implementation of an ETL workflow, making the task of assessing ETL tools extremely difficult. In this paper, we...