In Feburary 2016 18,
Databases can hold a significant amount of information, perhaps millions or billions of pieces of data. Normalizing a database reduces its size and prevents data duplication. It ensures that each piece of data is stored only once.
Groups Data Logically
Application developers who create applications to 'talk' to a database find it easier to deal with a normalized database. The data they access is organized more logically in a normalized database, often similar to the way in which the real-world objects that the data represent are organized. That makes the developers' applications easier to design, write and change.
Enforces Referential Integrity on Data
Referential integrity is the enforcement of relationships between data in joined tables. Without referential integrity, data in a table can lose its link to other tables where related data is held. This leads to orphaned and inconsistent data in tables. A normalized database, with joins between tables, can prevent this from happening.
Slows Database Performance
A highly normalized database with many tables and joins between the tables is slower than a database without those attributes. Many people using a normalized database at the same time also can slow down database speed. In some cases, a certain amount of denormalization of the database may be required to improve database speed.
Requires Detailed Analysis and Design
Normalizing a database is a complex and difficult task. Large databases with considerable amounts of information, such as ones run by banks, require careful analysis and design before they are normalized. Knowing the intended use of a database, such as whether it should it be optimized for reading data, writing data or both, also affects how it is normalized. A poorly normalized database may perform badly and store data inefficiently.
In Feburary 2016 18,
Showing posts with label world. Show all posts
Showing posts with label world. Show all posts
Thursday, 18 February 2016
Can I Host My Own Website on My Computer?In Feburary 2016 18,
In Feburary 2016 18,
When hosting a website, upload speed is critical. Incoming traffic on a web server consists mostly of page requests, which are small packets of information easily handled by a broadband connection. The web server responds to a request by sending (uploading) the information on the server to the remote computer. Most Internet service providers (ISPs) base their connection speeds on the available download bandwidth. Upload speeds are generally half of the rated download. You will need at least a DSL connection to host a website that loads on a remote computer in a reasonable amount of time.
Hardware
A web server doesn't necessarily have to be a powerhouse computer. It simply handles file requests and sends requested pages and information. Don't use your personal computer though. When you host an Internet site, you are inviting everyone in the world to access your host computer. Any personal information located on the server will be considered fair game by hackers.In addition to a server computer, you will need a router to direct Internet traffic through your local network onto the web. The router should be capable of port forwarding (all http requests go through port 80) and should have physical Ethernet ports to connect to the server. Wi-Fi connections aren't as fast or reliable as hard-wired connections.
Software
Special web server software is necessary to set a computer up as a web host. Microsoft Internet Information Server can be downloaded free from the Microsoft website. It allows users to host websites on Windows-based PCs. Linux, Apache, MySQL and myPHP (LAMP) is another free option for web hosting software. In a LAMP installation, Linux is the base operating system, Apache functions as the web server, MySQL is the database engine and myPHP processes host PHP script requests. LAMP is available free for Ubuntu, Debian and SUSE installations as well as commercial Linux releases like Red Hat.
Address
You will need to register a domain name, like myhomedomain.com, so visitors can locate your server. There is a small fee associated with this. Domain registrars offer a variety of services for a variety of prices. Once the domain name is registered, you will have to submit it to a DNS server. Unlike domain registration, this step is available as a free service from some organizations. The last portion of your address to consider is whether you have a static or dynamic IP address. A static IP address never changes. This makes it easier for the DNS servers to keep track of your website and is required by some e-commerce applications. Dynamic IP addresses change periodically. Most ISPs have an additional charge for static IP addresses.
In Feburary 2016 18,
When hosting a website, upload speed is critical. Incoming traffic on a web server consists mostly of page requests, which are small packets of information easily handled by a broadband connection. The web server responds to a request by sending (uploading) the information on the server to the remote computer. Most Internet service providers (ISPs) base their connection speeds on the available download bandwidth. Upload speeds are generally half of the rated download. You will need at least a DSL connection to host a website that loads on a remote computer in a reasonable amount of time.
Hardware
A web server doesn't necessarily have to be a powerhouse computer. It simply handles file requests and sends requested pages and information. Don't use your personal computer though. When you host an Internet site, you are inviting everyone in the world to access your host computer. Any personal information located on the server will be considered fair game by hackers.In addition to a server computer, you will need a router to direct Internet traffic through your local network onto the web. The router should be capable of port forwarding (all http requests go through port 80) and should have physical Ethernet ports to connect to the server. Wi-Fi connections aren't as fast or reliable as hard-wired connections.
Software
Special web server software is necessary to set a computer up as a web host. Microsoft Internet Information Server can be downloaded free from the Microsoft website. It allows users to host websites on Windows-based PCs. Linux, Apache, MySQL and myPHP (LAMP) is another free option for web hosting software. In a LAMP installation, Linux is the base operating system, Apache functions as the web server, MySQL is the database engine and myPHP processes host PHP script requests. LAMP is available free for Ubuntu, Debian and SUSE installations as well as commercial Linux releases like Red Hat.
Address
You will need to register a domain name, like myhomedomain.com, so visitors can locate your server. There is a small fee associated with this. Domain registrars offer a variety of services for a variety of prices. Once the domain name is registered, you will have to submit it to a DNS server. Unlike domain registration, this step is available as a free service from some organizations. The last portion of your address to consider is whether you have a static or dynamic IP address. A static IP address never changes. This makes it easier for the DNS servers to keep track of your website and is required by some e-commerce applications. Dynamic IP addresses change periodically. Most ISPs have an additional charge for static IP addresses.
In Feburary 2016 18,
Friday, 12 February 2016
The Difference Between a File Server an FTP ServerIn Feburary 2016 12,
In Feburary 2016 12,
File servers store data for an entire network, just as an individual computer's hard drive stores data for that individual computer. File Transfer Protocol (FTP) servers run an FTP application to exchange files over the Internet, which is the world's largest network.
Similarities
File serving and FTP serving are both networking methods that involve file transfer between computers. FTP servers need to work together with file servers in order to function. In a network using FTP, file servers store data while FTP servers transmit that data over the Internet, with both being necessary for file transfer to occur.
Differences
FTP servers download files from or upload files to file servers. FTP servers move files to and from file server locations. FTP servers require file servers, but file servers do not require FTP servers, since file servers also serve various intranet networks not connected to the Internet.
In Feburary 2016 12,
File servers store data for an entire network, just as an individual computer's hard drive stores data for that individual computer. File Transfer Protocol (FTP) servers run an FTP application to exchange files over the Internet, which is the world's largest network.
Similarities
File serving and FTP serving are both networking methods that involve file transfer between computers. FTP servers need to work together with file servers in order to function. In a network using FTP, file servers store data while FTP servers transmit that data over the Internet, with both being necessary for file transfer to occur.
Differences
FTP servers download files from or upload files to file servers. FTP servers move files to and from file server locations. FTP servers require file servers, but file servers do not require FTP servers, since file servers also serve various intranet networks not connected to the Internet.
In Feburary 2016 12,
Monday, 8 February 2016
How to Host a Foreign Exchange StudentIn Feburary 2016 08,
In Feburary 2016 08,
Know what you are getting into. Realize that hosting an exchange student is like adopting him or her for the time they are in this country. These students have financial resources and are almost always covered with medical insurance policies, but their housing, supervision and emotional support come directly from the host family. It is also true that because of cultural differences, exchange students sometimes have difficulty integrating into the hectic and competitive society that exists in American high schools and junior high schools.
Go through a rigorous placement process. Prior to 2006, background checks were optional and at the discretion of the entity responsible for the exchange student's placement. Following a series of articles from all over the world that documented apparent abuse of students during their stay in the United States, legislation was initiated to establish oversight of the placement process. At that time, many if not most exchange student agencies voluntarily began requiring criminal background checks on the adult members of prospective host families.
Decide which organization you want to use for placement. There are a large number of entities that handle placement of exchange students. Some of these organizations work with designated countries, some with designated religious affiliations, some with specific educational organizations and others without a defined population of any kind. The Council for Standards on International Educational Travel (CSIET) is such an organization. CSIET has a list of vetted programs throughout America.
Check the websites of three of the oldest exchange student organizations: the American Field Service, The Rotary Youth Exchange and The Youth for Understanding Foundation. These organizations have long standing reputations. They place a large number of students.
Check smaller organizations, and organizations that serve specific populations of students. AYUSA, The Center for Cultural Exchange and The World Heritage Student Exchange Programs are examples of such programs.
Apply with one of the organizations after considering the responsibilities inherent in the program and the type student you would like to host.
In Feburary 2016 08,
Know what you are getting into. Realize that hosting an exchange student is like adopting him or her for the time they are in this country. These students have financial resources and are almost always covered with medical insurance policies, but their housing, supervision and emotional support come directly from the host family. It is also true that because of cultural differences, exchange students sometimes have difficulty integrating into the hectic and competitive society that exists in American high schools and junior high schools.
Go through a rigorous placement process. Prior to 2006, background checks were optional and at the discretion of the entity responsible for the exchange student's placement. Following a series of articles from all over the world that documented apparent abuse of students during their stay in the United States, legislation was initiated to establish oversight of the placement process. At that time, many if not most exchange student agencies voluntarily began requiring criminal background checks on the adult members of prospective host families.
Decide which organization you want to use for placement. There are a large number of entities that handle placement of exchange students. Some of these organizations work with designated countries, some with designated religious affiliations, some with specific educational organizations and others without a defined population of any kind. The Council for Standards on International Educational Travel (CSIET) is such an organization. CSIET has a list of vetted programs throughout America.
Check the websites of three of the oldest exchange student organizations: the American Field Service, The Rotary Youth Exchange and The Youth for Understanding Foundation. These organizations have long standing reputations. They place a large number of students.
Check smaller organizations, and organizations that serve specific populations of students. AYUSA, The Center for Cultural Exchange and The World Heritage Student Exchange Programs are examples of such programs.
Apply with one of the organizations after considering the responsibilities inherent in the program and the type student you would like to host.
In Feburary 2016 08,
Wednesday, 3 February 2016
How Do I Play a PHP File?In Feburary 2016 03,
In Feburary 2016 03,
Adobe Dreamweaver is a web-designing program that is very effective in reading and playing PHP files. Dreamweaver is one of the most popular web design programs in the world and it can be used to create, edit, and delete various web programs and files that create a web page. Dreamweaver MX can be used to write and create PHP applications and can open and read pre-existing applications. Just open the file you need to look at and Dreamweaver will read it and convert it into a legible format so you can read the code.
Web Browser
If you are simply trying to view the end result of the PHP programming and not actually edit it, any web browser should be able to open and play the PHP files so long as there are no errors in the programming. If the PHP scripts have errors in them, the browser will likely not play the file or show an error message. Otherwise, the browser will open the PHP files as the web server converts it into an HTML coding that the browser can read. Just go to the website that has the PHP files in question and the browser should open it. If the file is actually on your computer, use a browser to open it and you may still be able to see it, depending on the browser.
In Feburary 2016 03,
Adobe Dreamweaver is a web-designing program that is very effective in reading and playing PHP files. Dreamweaver is one of the most popular web design programs in the world and it can be used to create, edit, and delete various web programs and files that create a web page. Dreamweaver MX can be used to write and create PHP applications and can open and read pre-existing applications. Just open the file you need to look at and Dreamweaver will read it and convert it into a legible format so you can read the code.
Web Browser
If you are simply trying to view the end result of the PHP programming and not actually edit it, any web browser should be able to open and play the PHP files so long as there are no errors in the programming. If the PHP scripts have errors in them, the browser will likely not play the file or show an error message. Otherwise, the browser will open the PHP files as the web server converts it into an HTML coding that the browser can read. Just go to the website that has the PHP files in question and the browser should open it. If the file is actually on your computer, use a browser to open it and you may still be able to see it, depending on the browser.
In Feburary 2016 03,
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