Companies use Extract-Transform-Load (Etl) tools to save time and costs when developing and maintaining data migration tasks. Etl tools allow the definition of often complex processes to extract, transform, and load heterogeneous data into a data warehouse or to perform other data migration tasks. In larger organizations many Etl processes of different data integration and warehouse projects ac...

Extract, transform and load (ETL) is a process that makes it possible to extract data from operational data sources, to transform data in the way needed for data warehousing purposes and to load data into a data warehouse (DW). ETL process is the most important part when building the data warehouse. Because the ETL process is a very complex and time consuming, this paper presents a prototype of...

Extraction–Transform–Load (ETL) processes comprise complex data workflows, which are responsible for the maintenance of a Data Warehouse. Their practical importance is denoted by the fact that a plethora of ETL tools currently constitutes a multi-million dollars market. However, each one of them follows a different design and modeling technique and internal language. So far, the research commun...

The Extract, Transform, Load (ETL) process design is difficult to perform because of the ambiguity of user requirements and the complexity of data integration and transformation. Current studies have explored the ontology-based approach to overcome these limitations by reconciling the semantics of user requirements within the ETL process design for easy generation of the ETL process specificati...

Large organizations load much of their data into data warehouses for subsequent querying, analysis, and data mining. Extract-Transform-Load (ETL) workflows populate those data warehouses with data from various data sources by specifying and executing a set of transformations forming a directed acyclic transformation graph (DAG). Over time, hundreds of individual ETL workflows evolve as new sour...

ETL stands for extraction, transformation, and loading, in other words, for the data warehouse (DW) backstage. The main focus of our exposition here is the practical application of the ETL process in real world cases with extra problems and strong requirements, particularly performance issues related to population of large data warehouses. In a context of ETL/DW with strong requirements, we can...

Enteropathy-type T-cell lymphoma (ETL) or enteropathy-associated T-cell lymphoma is a very rare malignant intestinal tumor. ETL is usually diagnosed by surgery. Endoscopic findings of ETL are not well known, and there are few reports of findings from endoscopy that has been performed only using white light. Additionally, there are no definite treatment guidelines for ETL. Therefore, we report a...

Extraction-Transformation-Loading (ETL) tools are pieces of software responsible for the extraction of data from several sources, their cleansing, customization and insertion into a data warehouse. In this paper, we delve into the logical design of ETL scenarios. We describe a framework for the declarative specification of ETL scenarios with two main characteristics: genericity and customizatio...

ETL process (Extracting-Transforming-Loading) is responsible for (E)xtracting data from heterogeneous sources, (T)ransforming and finally (L)oading them into a data warehouse (DW). Nowadays, Internet and Web 2.0 are generating data at an increasing rate, and therefore put the information systems (IS) face to the challenge of big data. Data integration systems and ETL, in particular, should be r...