Answer:
An index
1. is sorted by key values, (that need not be the same as those of the table)
2. is small, has just a few columns of the table.
3. refers for a key value to the right block within the table.
4. speeds up reading a row, when you know the right search arguments.
1. is sorted by key values, (that need not be the same as those of the table)
2. is small, has just a few columns of the table.
3. refers for a key value to the right block within the table.
4. speeds up reading a row, when you know the right search arguments.
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