In Feburary 2016 24,
Web databases work differently than static databases, limited to one computer or a LAN network where the reference documents and other data does not change location. A web database is a dynamic website that indexes searchable information (either on the same website or to external web pages). Most web databases point to other sites. A typical web database will point to pages that have been deleted, altered or moved to another location. The creator or user of a web database has no control over the external pages referenced or linked to. Because of this non-static nature of the Internet, web database administrators attempt to keep on top of data changes and links to external pages. This is especially true with links to pages that have moved or vanished from the web. Metasites, which contain only links to other web sites, primarily search engines, tend to organize their databases in small hierarchies that provide links to other sites containing relevant data to a particular subject. These metasite web databases are organized around one subject, such as science, technology, news, games and other search engines. Another kind of metasite for web databases is a search engine site that runs multiple search engines. An example of this kind of web database is dogpile.com, which uses Google and other top search engines for random searches on the web.
Keeping Track of Data
Web databases store information in record and index structures. The record structure is visible to users, while the index structure is typically not available for users to browse. A number of web databases use artificial intelligence to handle updates to links. When a source of data moves to a new location on the Internet, the artificial intelligence changes the hyperlink's address to match the new destination. Other web databases use link-checking programs that must be manually run by a web database administrator. Links to metasites, journals and other records are listed in the heading of most online databases. The difficulty with the information provided in these headings is that the links tend not to show when they were last updated. The web database's main page typically displays the site having been updated the previous year. Check the subsidiary pages for a more accurate display of when web data and links have been updated. Use the information on the subsidiary pages for citing references in your research.
Systems and Languages
The most common web databases are MySQL, Oracle, Microsoft SQL Server, Postgre SQL, IBM DB2 and HSQLDB. The platforms web databases run on are Windows, Linux, Unix, and Solaris. Preprocessor hypertext (PHP) scripting language is used to create web databases (PHP runs on the server and not the browser). Learn to use PHP, because it enables web databases to run on multiple operating systems. PHP handles all requests from the web browser, so you won't have to hassle with heavy hypertext markup language (HTML) when you create your web pages.
In Feburary 2016 24,
Showing posts with label organized. Show all posts
Showing posts with label organized. Show all posts
Wednesday, 24 February 2016
Thursday, 18 February 2016
Advantages Disadvantages of Normalizing a DatabaseIn Feburary 2016 18,
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,
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,
Sunday, 7 February 2016
How to Welcome a Distinguished GuestIn Feburary 2016 07,
In Feburary 2016 07,
Greet your guest personally. Whether you're meeting a distinguished guest at the airport or just prior to a formal business meeting, greet him with a friendly handshake and a brief introduction. Proceed to introduce any of your accompanying associates to your guest. For example, you might say, 'Ms. Important Guest, I'd like to introduce you to our organization's advertising representative, Mr. Jack Jackson.'
Present your guest with an event agenda that outlines meeting times and locations, organized meals, group activities and downtime. Familiarize your guest with the meeting or event facility, continuing to introduce her to associates you bump into during the process.
Make your guest as comfortable as possible. If your event calls for overnight accommodations, have the room reserved well in advance. Have a copy of the event agenda in the room, as well as contact information for yourself and other event planners. Additionally, make sure your meeting rooms are clean, organized and well-marked.
Follow seating etiquette for formal dinner parties. Your distinguished guest should be seated to the right of the host. Place cards may be used to identify seating arrangements for guests.
Write and execute a brief but professional speech to introduce your distinguished guest if he is scheduled to speak at a meeting, luncheon or dinner. Otherwise, welcome your guest with succinct remarks relating his position or honors at any meeting or event in which he is a participant. For an introductory speech, you need to prepare ahead of time, developing a brief biographical sketch of your speaker by researching his credentials, achievements and honors. An introductory speech should address the topic at hand, the relevance of the topic and a brief overview of the credentials of the speaker. Save his name for last, both to build momentum and as a cue to the audience to welcome the guest.
In Feburary 2016 07,
Greet your guest personally. Whether you're meeting a distinguished guest at the airport or just prior to a formal business meeting, greet him with a friendly handshake and a brief introduction. Proceed to introduce any of your accompanying associates to your guest. For example, you might say, 'Ms. Important Guest, I'd like to introduce you to our organization's advertising representative, Mr. Jack Jackson.'
Present your guest with an event agenda that outlines meeting times and locations, organized meals, group activities and downtime. Familiarize your guest with the meeting or event facility, continuing to introduce her to associates you bump into during the process.
Make your guest as comfortable as possible. If your event calls for overnight accommodations, have the room reserved well in advance. Have a copy of the event agenda in the room, as well as contact information for yourself and other event planners. Additionally, make sure your meeting rooms are clean, organized and well-marked.
Follow seating etiquette for formal dinner parties. Your distinguished guest should be seated to the right of the host. Place cards may be used to identify seating arrangements for guests.
Write and execute a brief but professional speech to introduce your distinguished guest if he is scheduled to speak at a meeting, luncheon or dinner. Otherwise, welcome your guest with succinct remarks relating his position or honors at any meeting or event in which he is a participant. For an introductory speech, you need to prepare ahead of time, developing a brief biographical sketch of your speaker by researching his credentials, achievements and honors. An introductory speech should address the topic at hand, the relevance of the topic and a brief overview of the credentials of the speaker. Save his name for last, both to build momentum and as a cue to the audience to welcome the guest.
In Feburary 2016 07,
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