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

Introducing UTC

UTC is a time representation that applies zero offsets. It is then used as a reference for other time zones. UTC representation is denoted either by the symbol UTC placed after the time specification (for example, 08:30 UTC) or by using an empty time zone specification Z (for example, 8:30Z).

UTC is the primary standard for dealing with time management and representations. It regulates and synchronizes clocks and time. It references Greenwich Mean Time (GMT) and does not depend on DST. It was first used in 1960, followed by the standardization in 1963, introducing the official abbreviation – UTC. It was updated in 1970 to cover the leap second.

UTC is divided into individual day, hour, minute, and second elements. Days are identified by the Gregorian calendar reference, but the Julian day numbers can also be used (the transformation principles are described in the Gregorian versus Julian calendar section). Each day contains 24 hours. Each hour consists...