Physical Database Design
Which of the following is not a factor to consider when switching from small to large block size?

Block contention
Random row access speed
The length of all of the fields in a table row
The number of columns

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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.
Do not specify a unique index for the primary key of each table.
Be careful indexing attributes that have null values.

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