Attribute: Attribute is a property of an entity. It describes each entity in a database and the name of the column in a table is representing an attribute. Fields in a database table are also referred to as attributes of a database object. Subtype: Subtype is one type of entity which inherits the attributes from other entity. The subtype relationship is a grouping of entities type in single entity that shares the common attributes or relationships which are different from other grouping. It is related to an entity supertype, where the supertype entity has common characteristics and the subtype entity has the unique characteristics of each entity subtype.

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Question D.4: FIFO Page Replacement Consider the following page reference string: e, c, b, e, a, g, d, c, e, g, d, a Considering 4 frames, fill in the following table and then answer how many page faults would occur with the FIFO page replacement algorithm. RS: reference string; FO: frame 0, F1: frame 1, etc. Hint: all frames are initially empty, so your first unique pages will all cost one fault each. Time 1234567891011 12 RS e cb e agd ce g d a FO F1 F2 F3 Page fault? b) Total # page faults: c) Briefly (1-2 sentences) explain Belady's Anomaly that can occur in FIFO Page Replacement.

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Chapter 5, Problem 8RQ

Program Plan Intro

Attribute:

Attribute is a property of an entity. It describes each entity in a database and the name of the column in a table is representing an attribute.

Fields in a database table are also referred to as attributes of a database object.

Subtype:

Subtype is one type of entity which inherits the attributes from other entity.

The subtype relationship is a grouping of entities type in single entity that shares the common attributes or relationships which are different from other grouping.

It is related to an entity supertype, where the supertype entity has common characteristics and the subtype entity has the unique characteristics of each entity subtype.

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