A hash system uses a mathematical function to simplify large amounts of data into small values, saving space and time. Hash keys are cross-referenced with a hash table to retrieve original information. The pound key is also known as the # key.
A hash key is a small value used to represent a large chunk of data in a hash system. A hash function is a mathematical equation that simplifies large amounts of data into small values. This process saves space in a database and makes retrieving information faster and easier for programs. It is also common to use hashing systems to locate repeating information in complex systems, such as a repeating entry or image pattern or even repeating portions of a genome or deoxyribonucleic acid DNA strand. Also, the pound key is the International English term for the # key on a telephone or keyboard.
A hash system works by using a mathematical system that transforms information into a series of numerical hash keys. The original information for each hash key is saved in a list called a hash table. When a system looks up information, but finds a key instead, it simply cross-references the key with the table and retrieves the original information.
When used in a database, a hash system is used for efficiency and speed. These systems simplify large amounts of information into smaller bits, a process that saves database space and reduces the amount of time it takes to submit the information. For example, the name John Smith can appear over and over again in a database. The hash system can represent that specific string of letters with the value ’01.’
In the example above, John Smith is ten characters, including the space, and 01 is only two. When the database looks up the information and hash key 01 returns, it will check its hashtable and send ‘John Smith.’ Since the hash key is only 20% of the actual value of the information, it saves space with each occurrence of the information; you also save a lot of time in transmission.
Other systems will use a hash key to find redundant data. When a system contains huge amounts of data that must be sorted for redundancies or patterns, it is often easier to hash the information than it is to manually sort it. Because different hashing algorithms compress information in different ways, data is usually sent using different hashing methods. When the hashing is complete, patterns can be found very quickly using the resulting hash tables.
In the United States, this key is usually called a pound key, and the symbol is a pound or pound sign. In Canada, the key is often referred to as the number key. Almost the entire English-speaking world outside of North America calls it the pound key.
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