System Analysis and Design
Sequential organization

Stores records sequentially but uses an index to locate records
means storing records in contiguous blocks according to a key.
None of these
uses an index for each key type
has records placed randomly throughout the file

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System Analysis and Design
Advantages of Relational Database Management systems are

Security controls can be more easily implemented.
All of these
Data independence since it allows the database to grow by adding new attributes and relations.
None of these
Flexibility, of relating different logical files

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