"1.The process of developing a physical data model, followed by definition of all physical database objects, including tables, indexes, and sequences. 2.The physical data model and the detailed DDL for a database. The database design addresses physical constraints such as storage and performance." (DAMA International, "The DAMA Dictionary of Data Management", 2011)
"The process that yields the description of the database structure. The database design process determines the database components. Database design is the second phase of the Database Life Cycle." (Carlos Coronel et al, "Database Systems: Design, Implementation, and Management 9th Ed", 2011)
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