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Storage Of Database On Hard Disks At this point, it is worthwhile to note the difference among the terms file Organisation and the access method. A file organisation shows to t
The Locking Protocol: To manage concurrency related problems we use locking. A lock is mainly a variable that is associated with a data item in the database. A lock can be located
Multi-Key File Organisation In this part, we will introduce two basic file Organisation schemes that permit records to be accessed by more than one key field, therefore, allowi
Consider entity type Employee with attributes empNumber (this is unique), empName, and the year when he/she was hired. An employee can either be a technical employee, a marketing e
How persistent programming languages differ from traditional programming languages? Database languages vary from traditional programming languages in that they directly manipul
Relational Model: The relational model uses a collection of tables to represent both data and the relationships among those data. Each table has multiple columns and each column h
What is storage manager? A storage manager is a program module that gives the interface between the Low level data kept in a database and the application programs
What is an index? An index is a structure that helps to place desired records of a relation quickly, without probing all records.
explain the mapping constraints
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