File Organization Techniques Record Access Methods Data Structures
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12-10-2010, 09:52 PM

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File Organization Techniques
Record Access Methods
Data Structures

Physical Design

Provide good performance
Fast response time
Minimum disk accesses

Seek time
Average time to move the read-write head
Rotational delay
Average time for the sector to move under the read-write head
Time to read a sector and transfer the data to memory

More Definitions

Logical Record
The data about an entity (a row in a table)
Physical Record
A sector, page or block on the storage medium
Typically several logical records can be stored in one physical record.

File Organization Techniques

Three techniques
Heap (unordered)
Sequential (SAM)
Indexed Sequential (ISAM)
Hashed or Direct
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