Explain the three-level hierarchy of a typical ETL cycle.

The typical three-level hierarchy of an ETL cycle is composed of the following:

• Staging Layer − This layer is utilized to store the information extricated from various source information frameworks.
• Data Integration Layer − This layer changes the information from the organizing layer and moves the information to a database, where the information is masterminded into various leveled gatherings, frequently called measurements, and into actualities and total realities. The blend of realities and measurements tables in a DW framework is known as an outline.
• Access Layer − This layer is utilized by end-clients to recover the information for explanatory detailing.