Marshaling

In computer science, marshaling is the process of transforming the memory representation of an object to a data format suitable for storage or transmission, and it is typically used when data must be moved between different parts of a computer program or from one program to another. Marshaling is similar to serialization and is used to communicate to remote objects with an object.

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#marshaling

Terminology in SQL Part 2

Extent – the basic unit in which space is managed. An extent is eight physically contiguous pages, or 64 KB. This means SQL Server databases have 16 extents per megabyte.

Uniform extents – owned by a single object; all eight pages in the extent can only be used by the owning object.

Mixed extents – shared by up to eight objects. Each of the eight pages in the extent can be owned by a different object.

Allocation Unit – a set of particular types of pages.

Partition – is a unit of data organization.

Heap – a table without a clustered index.

IAM – Index Allocation Map-the page that keeps track of all the pages allocated to a heap. (Can be more than one)

B+ Trees – B-tree stands for “balanced tree,” and SQL Server uses a special kind called B+ trees (pronounced “b-plus trees”) that are not kept strictly balanced in all ways at all times. Unlike a normal tree, B-trees are always inverted, with their root (a single page) at the top and their leaf level at the bottom.

Root Node – The top node of the B+ tree is called the root node.

SGAM – tracks shared extents.

GAM- tracks an allocation event.

#terminology

Terminology in SQL Part 1

Page – The fundamental unit of data storage in SQL Server

DBCC PAGE – allows you to examine the contents of data and index pages.

DBCC IND – lists of all database pages that make up the selected index or partition.

Data Page – stores data,except text, ntext, image, nvarchar(max), varchar(max), varbinary(max), and xml data, when text in row is set to ON.

Log Files – a series of log records.

Extents – a collection of eight physically contiguous pages and are used to efficiently manage the pages.

.mdf – Primary data file.

.ndf – Secondary data file.

#terminology

Studying and exploring the Architecture…

Studying and exploring the Architecture modules.

RTM: Requirement Traceability Matrix

Definition1:
Requirement Traceability Matrix or RTM captures all requirements proposed by the client or development team and their traceability in a single document delivered at the conclusion of the life-cycle. In other words, it is a document that maps and traces user requirement with test cases.

Definition2:
The Requirements Traceability Matrix (RTM) is a document that links requirements throughout the validation process. The purpose of the Requirements Traceability Matrix is to ensure that all requirements defined for a system are tested in the test protocols.

#rtm

Module, Directives, Filter, Controller

An AngularJS module defines an application. The module is a container for the different parts of an application.
The module is a container for the application controllers. Controllers always belong to a module.
The module is created using angular.module, please see the example below

A module is created by using the AngularJS function angular.module
angular.module(“myAppMainModule”, []);

or

var app = angular.module(“myAppMainModule”, []);

Where [] contains the list of built-in angular services. We will learn about angular in later articles.

Defined module can be attached to HTML section using ng-app directive.

Example:

Angular JS provides a set of directives which help to achieve many functionalities easily in your application.
For example:
ng-app: directive initializes an AngularJS application.
ng-init: directive initializes application data.
ng-repeate: directive helps to repeat the data in the collection.

You can also add your own directives and use in your application.

AngularJS controllers control the data of AngularJS applications. AngularJS controllers are regular JavaScript Objects. AngularJS applications are controlled by controllers. The ng-controller directive defines the application controller.

Example:

First Name:
Last Name:

Full Name: {{firstName + ” ” + lastName}}

var app = angular.module(‘myApp’, []);
app.controller(‘myCtrl’, function($scope) {
$scope.firstName = “Izharuddin”;
$scope.lastName = “Shaikh”;
});

Filters can be added in AngularJS to format data. AngularJS provides filters to transform data:

currency: Format a number to a currency format.
date: Format a date to a specified format.
filter: Select a subset of items from an array.
json: Format an object to a JSON string.
limitTo: Limits an array/string, into a specified number of elements/characters.
lowercase: Format a string to lower case.
number: Format a number to a string.
orderBy: Orders an array by an expression.
uppercase: Format a string to upper case.

Example:

The name is {{ lastName | lowercase }}

#controller, #directives, #filter, #module

Introduction to Angular JS

AngularJS is a JavaScript-based open-source front-end web application framework mainly maintained by Google and by a community of individuals and corporations to address many of the challenges encountered in developing single-page applications.

Before we go in depth to understand what features Angular Js provide with respect to Single Page Application (SPA), let’s first understand the challenges we have with SPA.

The problems with SPA application includes DOM Manipulation, History, Routing, Ajax, Object Modeling, Data Binding, View Loading, Module Loading, Caching etc. With Angular, all the stuff already built in and there are various core libraries available to handle all these challenges.

Angular Js provides Two-way Data Binding, DOM manipulations can be done using jqLite or JQuery, In built routing, Templates, History tracking, Factories, Services, Validations, Controllers, Views, Directories and Dependency Injection.

#introduction-to-angular-js