System Analysis and Design
Indexed-Sequential organization

means storing records in contiguous blocks according to a key
stores records sequentially but uses an index to locate records
has records placed randomly throughout the file
uses an index for each key type

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System Analysis and Design
Data Definition Language (DDL)

all of the listed here
describes how data are structured in the data base
determine how data must be structured to produce the user's view
specifies for the DBMS what is required; the techniques used to process data

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