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What are the advantage of using fixed length fields instead of variable length fields in a database?
Wiki User
∙ 13y ago
A fixed length field is one which contains a set number of characters.
With fixed length fields, the fields may need to be padded out to the right length, eg with
eg If a Surname field is set at 10 characters then the name SIMPSON would need 3
Advantage - Every record is the same size, so it is possible for the computer to calculate exactly where each record starts in the file and therefore it is quicker for the computer to find a particular record.
Wiki User
∙ 13y ago
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How many fields does a database have?
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Fixed length fields are columns in a database table that always use a set amount of space for each row of data in the table. A fixed length field of 50 characters will always consume 50 characters for that field, regardless of how long the actual data in that field requires. Fixed length fields typically use more storage resources than variable length fields, but they are a bit faster for the processor to work with, since the length only needs to be determined once. Fixed length fields are appropriate for data where the length is constant. Some examples of fields that are good candidates for fixed length fields include Social Security Numbers, fixed length postal codes/ZIP Codes and telephone numbers (provided international data is unexpected.) Data that varies in length should be stored in a variable length field, as it will take less physical storage space and will not need to be truncated to remove extra spaces.
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Is 'A database uses characteristics such as field size and data type to define each field' false?
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What is the key fields in a database?
what is a Absolute reference
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How many fields does a database have?
Modern databases do not have a preset number of fields. Rather, the data architect determines the needed tables and number of fields per table and declares that to the database software. Fields can--with some restrictions--also be added and removed later as needed. That said, each database application does have a maximum limit on the number of fields per table and the number of tables per database, which information has to come from the database manufacturer. But those limits are usually vastly greater than anyone might want. It is part of a computer and it has many fields.
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