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Web Hosting - Domain Name Changes and How They Affect You
New domain names are registered all the time, and ones previously registered expired. Sometimes that's the result of simple neglect. The owner of the name chose not to renew his or her ownership, so the name became available for someone else to use. In rare cases, a highly original mind managed to think of a new one. In the other common scenarios, someone chose to just let it go or sell it.
When you choose to change your domain name, there are actually two separate steps involved: releasing the old name, and adopting the new one. But, just as the postal system can have difficulty forwarding your letters when you change your personal name, changing your domain name brings certain difficulties.
One of the most prominent is the fact that any name change requires a change to thousands of DNS Servers around the globe. DNS (Domain Name System) is the set of software/hardware components that allows domain names to map to IP addresses. IP addresses are what are actually used 'under the covers' when one computer communicates with another.
Note that there isn't always a 1:1 correspondence between a name and an IP address. One IP address can serve multiple domain names and one domain name can have multiple IP addresses. For the sake of simplicity, we'll stick to the common case here.
DNS servers around the world maintain internal databases that match the name to an IP address. Not all servers have all pairs of names/addresses. A series of complex routines allows a request to be forwarded when the particular DNS server doesn't have a needed record. When you acquire a domain name that used to be associated with a given IP address, the odds of you acquiring the same IP address are extremely low.
In the unlikely case, for example, that you acquired the domain name yahoo.com, you would almost certainly not get the IP address that was matched with it (unless you bought the Yahoo! company). So, as a result of the change, the name/IP address pair is no longer what it was.
A similar circumstance exists when you retain your IP address, but want to change the domain name associated with it. In either case, the pairing has changed.
The catch is this: when the change takes place, those DNS databases are not all updated instantaneously around the world.
Even apart from the limited speed with which computers and networks operate, (and neglecting the human factor if/when the change is made manually to more than one server) the reason is something called caching.
In order to communicate efficiently, DNS servers are designed to assume that changes will be relatively rare. Just as with the postal system, you don't move your address or change your name every minute. Since that's true, in general, the name/IP address pair is cached. A cache is a set of stored information that is reused so that fresh information doesn't have to be communicated with every request for a web page or data.
A chain of DNS servers pass requests to the last known address. There is usually more than one system between your computer and the server you want to communicate with. Most of the time, that's your current name/address. When you change the name, that pair is no longer valid. In order to propagate the new name/address pair (so the terminology goes), that cache has to be refreshed.
Something similar happens when you establish an entirely new name. That name is first associated with an IP address and that pair has to be communicated to DNS servers around the world in order for you to be able to reach any one of them at random.
But DNS servers don't do that until they are requested to do so by your action of asking for information from a remote server. Because of that, but chiefly because of caching, it can take quite a while for the new pair to become known around the Internet. Caches can expire and get refreshed in a few minutes or a few hours. It varies.
That time can be as short as an hour or less, if the path between your computer and the web server is very simple and only one DNS server needs to be updated. Or, it can take up to 48 hours or more. Though the 'official' range is often given by registrars as 24-48 hours, the average is closer to about six hours. But that's an average. The actual time in any given case can (and does) vary widely.
In the meantime, a number of effects can occur. The most obvious is that, since the name/IP address pair can't be resolved properly, you don't reach the server you want. Your browser points to the old one (in the rare case it's still accessible by that name and address), or it simply reports there's no such name at that address.
So, when registering a new name or buying an old one, you should establish the site, but not advertise it for at least a couple of days. Better to wait to get visitors than to turn them off by being 'not at home' when they call.
A Woman’s Appearance Do’s and Don’t for the Job Interview Proper dress and interview attire is one of the first and most important things that you have to work with when you are invited to an interview. Whether you are trying your luck on a position of CEO or as an entry-level worker, the person hiring you will make a great deal in out of the clothes you are wearing. Appropriate clothing is one of the first things that an interviewer will see of you and if you are off with it, you do not even have to talk much anymore. For a woman the dress to impress factor is way more complicated than for a man. A man can always choose to wear a business suit and tie, while there is not quite such an equivalent for the female clothing market. To give you a good idea about what women’s clothing articles you should wear when going for an job interview, here a short list: blazers, closed-toed shoes, dress pants, dress shirts, dress coats, women’s suits, skirts, hosiery and turtlenecks. All these clothing articles should be in solid colors and patterns. It is recommended to wear such colors as black, blue, navy, gray, brown and white/beige for shirts and tops. Colors and patterns need to be subtle and should not give the interviewer the wrong idea about you. Bright red attire might suggest that you are wilder or need to be the center of the room and this is not one of the traits that an employer wants to see in their employees. For women it is also very important that they do not wear to sexy cloths. No deep cut shirts that are exposing too much of the chest area, as this could suggest sexual tendencies to the future employer. Going along with this point is the skirt lengths. Should you decide to wear a skirt to your interview, keep your skirt lengths long enough to reach the knees or surpass them. Anything shorter is seen as naïve or even worse. Especially important when wearing a skirt to an interview is to wear tights and similar hosiery. Hosiery should be plain and without patterns. The colors should be complementing your business attire but not be too contrasting. When getting ready for your interview, besides the apparel you are wearing, the way you look is just as important. How about your hair? Make sure your hair is neat and do not style for a party. When putting on make-up, tread lightly. Do not use provocative colors such as way to red lips, especially in pale skin types. Make-up needs to be subtle and needs to emphasize your business attire. Most women do like their fingernails adorned with nail polish. When getting ready for an interview, it is important that your fingernails are neat and clean and when using nail polish, the color needs to complement your attire. Bright red is one of the colors that is not recommended to be used. Rather a clear, golden or darker subtle red color is more appropriate. It is also important to remember that anything that distracts from you as a person while being in an interview can take away the chance to land the job. Whenever you are going for an important interview it is recommended to have friends, family or maybe even colleagues check out your attire. Often times you might be wearing something that is not appropriate or does not fit right and in the excitement and rush of getting ready you might have not even realized it. Also, keep in mind that you need to feel comfortable in what you wear to be confident and secure when talking to the interviewer. Web Hosting - Databases, What Are They and Do You Need One? 'Database' is one of the most commonly used terms that one encounters in web site design. Yet, what they really are and whether they're essential is often not clear to novices. A database is a collection of organized data, stored in files that have a specific structure. It's that organization and structure that allows for easy and rapid storage and retrieval. The need for a database generally only arises when you have a certain amount of information and that information needs to have some structure. If you have a half-dozen names and addresses to store, a database is usually overkill. If you have a blob of data with no relationships between any of the items in that blob, maintaining a database is usually more trouble than it's worth. Maintain a database? Yes, like other complex systems a database, to be effective, needs to be designed properly at the outset then kept 'tuned' for good performance. The alternative is to gradually allow the database to become more and more disorganized. That leads to difficulty in use, poor speed of retrieval and more frequent failures. With MySQL, Access or MS SQL Server, the three most common choices of database product for web sites today, setting up a database is relatively simple. Even those with limited technical skill can get one up and running just by following some simple instructions. But some thought should be given to how you want the information organized, and to maintaining the system during its lifetime. Suppose you have a set of names, addresses, email addresses, products purchased, date purchased and amount. If you have only a few dozen records it matters very little how these pieces are arranged and related. A database usually isn't even warranted in this scenario. Once you have several thousand or more records, it matters a lot. Speed, the ease of expanding the set of attributes (like adding, say, product category), and other issues come into play. Even those with little technical expertise, but a willingness to exert logical thought and invest some time, can build a very robust database. Think about how you would organize a set of data (called 'tables'). Should Name, Address, and Product be in the same table? Or should the personal information be stored in one table and any product information (product, price, ...) in another? Some experimentation may be needed to get it right, but the choices have an impact on how easy the tables are to maintain. It also affects the speed with which programs can fetch old data and store the new. Having a database also introduces new maintenance issues for the server administrator, since backups usually need to be done differently. Recovering a failed database is usually more complicated than simply re-copying files from yesterday. Ask your hosting company what tools and skills they have for dealing with any database system you consider. It's true that introducing a database creates more complexity and the need for additional thought and administrative effort. At a certain level, professional expertise will be needed. But clearly the advantages outweigh the costs in many cases. Companies large and small eventually use databases to store and organize data. At some point, you may be fortunate enough to be one of them. |