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

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

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Physical Database Design
Which of the following are integrity controls that a DBMS may support?

Assume a default value in a field unless a user enters a value for that field.
All of these
Limit the set of permissible values that a field may assume.
Limit the use of null values in some fields.

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