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Answer

Variable length refers to anything whose length can vary. For example, in databases, a variable-length field is a field that does not have a fixed length. Instead, the field length varies depending on what data is stored in it.

Variable-length records arise in a database in several ways:

  • Storage of multiple items in a file
  • Record types allowing variable field size
  • Record types allowing repeating fields
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Answer

Variable length records as name suggest its size can vary but by a block. Initially few blocks are assigned to record and once they are full, another block is added to record size and once that's full double the blocks are being added... which keeps on increasing in multiples of 2

Answer

All files are of 2 types. Fixed Length record and variable length record. In variable length size of record is varies according to the data. This type of record lower the wastage of memory by variable size concept.

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