Mastery of Data Extraction in ETL

Which method of data extraction is specifically designed to capture real-time data updates with minimal latency?

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In the context of data sources, what is the main characteristic of unstructured data?

• It is organized in a predefined manner like rows and columns.

• It consists mainly of textual data without a predefined model.

• It cannot be processed by traditional databases.

• It always comes from web services and APIs.

What is the primary advantage of incremental extraction over full extraction in data extraction processes?

• It extracts the entire dataset every time.

• It is less complex and easier to manage.

• It reduces resource consumption by extracting only changed data.

• It requires no tracking of changes in the dataset.

Data propagation techniques are utilized for:

• Creating virtual views of integrated databases via data federation.

• Directly copying data from a source to a destination, potentially using incremental load files.

• Encrypting data at rest exclusively in OLTP systems.

• Implementing strict GDPR compliance through automated data extraction methods.

Which of the following best describes data extraction via logical extraction methods?

• Copying raw data files without considering data relationships.

• Extracting data directly from a live system in operation.

• Preserving the relationships and integrity of the data during extraction.

• Extracting unchanged data to reduce network load.

GDPR emphasizes the protection of personal data through principles such as:

• Data Minimization and Purpose Limitation.

• Incremental data loading exclusively.

• Mandatory use of offline extraction methods.

• Utilization of OLTP systems for data storage.

The ePrivacy Directive complements the GDPR by focusing on:

• The processing of personal data in transactional databases.

• The privacy of electronic communications and rules on cookies.

• Guidelines for physical extraction methods only.

• The regulation of data extraction from non-cooperative sources.

Incremental Extraction's efficiency is primarily hindered by:

• Its ability to efficiently handle deletions without additional mechanisms.

• The straightforward process of capturing data without considering changes.

• The complexity of tracking and propagating changes accurately.

• The requirement for real-time updates in all scenarios.

What is a significant challenge associated with offline data extraction?

• It requires real-time access to the source system.

• It can impact the performance of the source system.

• Data may not be up-to-date at the time of extraction.

• It is less secure than online extraction methods.

Change Data Capture (CDC) is crucial for:

• Ensuring data is extracted regardless of its structure or format.

• Capturing and propagating changes from source environments to maintain consistency.

• Conducting data extractions exclusively in batch processes.

• Implementing two-way data exchanges for OLAP systems.