Question: For databases the three-schema architecture is used to maintain the main characteristics of databases. (i) What are these characteristics? (ii) Can a two-schema architecture be

For databases the three-schema architecture is used to maintain the main

For databases the three-schema architecture is used to maintain the main characteristics of databases. (i) What are these characteristics? (ii) Can a two-schema architecture be used instead (explain)? What needs to be changed? Main Characteristics of Database Approach Self-describing nature of a database system (catalog) Insulation between programs and data, and data abstraction Support of multiple views of the data Sharing of data and multi-user transaction processing

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