creating an index field in a database by sandra landinguin
TRANSCRIPT
CREATING AN INDEX FIELD IN
A DATABASEcreated by Sandra Landinguin
DATABASE INDEXIndexes are one of the most important aspects of database design, yet one of the most underused in web applications. A database index can speed up a query by hundreds or thousands of times.
DATABASE INDEX
DATABASE INDEX
A DATABASE INDEX is a data structure that improves the speed of operation on a database table. I find it very useful, helpful and easy to use.
AND HERE IS WHY………….
Imagine, for example, if the phone book was not alphabetized and you had to find a name. It would take hours or days to find a name. This is exactly the kind of inefficiency that a database with no index has to contend with.
Lets take a look at another example..You have a customer table which contains customer names, numbers, addresses and other details. You can make indexes based on any information, such as the customers’ customer number, last name + first name (a composite field index based on more than one), or postal code. Then, when you’re searching for a particular customer or group of customers, you can use the INDEX to speed up the search.
If there would not be ANY database index, it would take you
a while to find my phone number….lol…
Sarah Jones (773) 465-5746 [email protected] Mary Smith (312) 345 – 4573 [email protected] Michael Johnson (847) 222 – 5685 [email protected] Jessica Thompson (312) 365- 4693 [email protected]
Having a database index, makes your search faster
and easier !!!
Using the INDEX speeds up the search. This increase in performance may not be noticeable in a table containing a hundred records; in a database of thousands of records it will be a BLESSING !!!
QUESTIONS ???