Book Image

Developing Robust Date and Time Oriented Applications in Oracle Cloud

By : Michal Kvet
Book Image

Developing Robust Date and Time Oriented Applications in Oracle Cloud

By: Michal Kvet

Overview of this book

Proper date and time management is critical for the development and reliability of Oracle Databases and cloud environments, which are among the most rapidly expanding technologies today. This knowledge can be applied to cloud technology, on premises, application development, and integration to emphasize regional settings, UTC coordination, or different time zones. This practical book focuses on code snippets and discusses the existing functionalities and limitations, along with covering data migration to the cloud by emphasizing the importance of proper date and time management. This book helps you understand the historical background and evolution of ANSI standards. You’ll get to grips with data types, constructor principles, and existing functionalities, and focus on the limitations of regional parameters and time zones, which help in expanding business to other parts of the world. You’ll also explore SQL injection threats, temporal database architecture, using Flashback Technology to reconstruct valid database images from the past, time zone management, and UTC synchronization across regions. By the end of this book, you’ll be able to create and manage temporal systems, prevent SQL injection attacks, use existing functionalities and define your own robust solutions for date management, and apply time zone and region rules.
Table of Contents (26 chapters)
1
Part 1: Discovering Oracle Cloud
4
Part 2: Understanding the Roots of Date and Time
7
Part 3: Modeling, Storing, and Managing Date and Time
12
Part 4: Modeling Validity Intervals
17
Part 5: Building Robust and Secure Temporal Solutions
20
Part 6: Expanding a Business Worldwide Using Oracle Cloud

Gregorian versus Julian calendar

The Gregorian calendar is currently commonly used, based on the already-specified principle of leap year management. The Gregorian calendar was introduced by Pope Gregory XIII in 1582. The aim was to apply date shift properly (one year does not take exactly 365.25 days, so the leap year should not be applied once in four years generally), respecting the Earth’s speed. This way, proper day mapping over the centuries can be ensured.

The Julian calendar was established in 46 BC by Julius Caesar as an update to the Roman calendar, which used 29 days for most months, by introducing an extra intercalary month between February and March. Note that this intercalary month is not applied every year but only for those years that are marked as intercalary years). It was used up to 1582. Then, it was replaced by the Gregorian calendar. The main difference in these calendars is related to the year definition. The Julian calendar has two types of year &...