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The Concept of Cardinal Reciprocity- A Primer

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Too many authors in the field of relational theory have neglected the concept of Cardinal Reciprocity. This can cause a number of subtle problems with database design in terms of its derivability, redundancy, and consistency. . Increasingly, this little-understood aspect of relational theory, that emphasises the cardinality of the attributes of tuples in a relation and the reciprocity with isomorphic foreign key restraints, is becoming a hot forum topic.

2009-04-01

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Backing Up a DMK

In SQL Server 2025, I have a database with a Database Masker Key (DMK). I want to back up this key and keep a copy offline. When do I have to open this key before running the backup?

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