Question 12.1 Use the object definition language ODL of the ODMG object model to specify an object database schena klass definitions) capturing the requirements from the following ER diagram about a publisher enterprise. Note that you can use any appropriate data types for your schema design, and no specification of behavior is required. Catato Name Tide M Publcaton Produce Publisher Page count Format Medum Address Duraton City Sreet Book Recording Questions 12.2 ts) List two popular heuristic rules used by a heuristic-based query optimizer in a relational DBMS.

Question 12.1 Use the object definition language ODL of the ODMG object model to specify an object database schena klass definitions) capturing the requirements from the following ER diagram about a publisher enterprise. Note that you can use any appropriate data types for your schema design, and no specification of behavior is required. Catato Name Tide M Publcaton Produce Publisher Page count Format Medum Address Duraton City Sreet Book Recording Questions 12.2 ts) List two popular heuristic rules used by a heuristic-based query optimizer in a relational DBMS.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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#DATE TIME-TEMPERATURE UNIT HUMIDITY%9/28/2010 15:45:14 22.248900 C 44.7219689/28/2010 16:00:07 22.738900 C 50.5399939/28/2010 16:15:07 23.388900 C 49.3393389/28/2010 16:30:07 23.918900 C 47.5392809/28/2010 16:45:08 23.668900 C 40.700378The first line is just a comment, and is there to help a human understand the data that they are seeing; it should be ignored (hint: any line beginning with '#' ought to be skipped.) Write a program to read the data from the file and produce the average temperature and average humidity for all the records in the file. This is a very large file - it is the actual temperature and humidity data from our server room. You would spend hours trying to do this manually, with a calculator, and you likely would make mistakes along the way. This is where computers are far superior to humans when dealing with boring, repetitive tasks. The output of the program will look like this: Average Temperature (C): NN.NNNNNNNNNNNNNN Average Humidity (%):…
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