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What is transaction? Transaction is a unit of program implementation that accesses and possibly updated several data items.
What are the purpose for having variable length records? What kinds of separator characters are required for each? Variable-Length Records - Variable-length records are thos
What is key ? Key - A single attribute or a combination of two or more attributes of an entity set which is used to recognize one or more instances (rows) of the set (table) is
explain cascading rollback
note on hashing technique
What do you mean through integrity constraints? Integrity Constraints -An integrity constraint is a condition specified on a database schema and restricts the data in which
Which are the two ways in which entities can participate in a relationship? Total and partial are the two ways in which entities can participate in a relationship
The Incident table, with an auto-incrementing incident number, etc, looks like: incident_num reporter date time incide
Differentiate between the object oriented decomposition and the structured decomposition? Process-oriented (structural) decomposition divides a complex process, function or tas
what problems are raised by the database? why is it so controversial? why is data quality an issue?
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