Answer Posted / Sanjeev Aherwar

{"snapshots": "A snapshot in the context of ETL (Extract, Transform, Load) is a point-in-time representation of data. It is created by taking a copy of data from a source system at a specific moment. The purpose is to capture a consistent view of data for reporting or analytical purposes.","materialized views": "Materialized views in Oracle ETL are pre-built, optimized query results that reside in the database. They are used to improve query performance by reducing the time taken to execute complex queries repeatedly. Materialized views are particularly useful when dealing with large datasets and complex join operations. The data is refreshed periodically based on a schedule or manually.","materialized view definition": "A materialized view definition (MVD) in Oracle ETL is a SQL statement that creates a materialized view. It includes the SELECT statement, any joins, filters, or sorting criteria needed to produce the desired result set, and specifies how often the data should be refreshed."

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