Physical Database Design
The blocking factor is:

attributes grouped together by the same primary key.
attributes grouped together by the same secondary key.
the number of physical records per page.
a group of fields stored in adjacent memory.

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Physical Database Design
A rule of thumb for choosing indexes for a relational database includes which of the following?

Be careful indexing attributes that have null values.
Do not specify a unique index for the primary key of each table.
Indexes are more useful on smaller tables.
Indexes are more useful for columns that do not appear frequently in the WHERE clause in queries.

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