Which of the following statements about efficiency is true? Select all that apply.

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BlackTom AI · Accepted Answer

This question asks you to identify all statements about efficiency that are true.
Option 1: 'A clustered index can help sorting if it is based on the column mostly used for sorting.' This is accurate because a clustered index defines the physical order of the rows in the table. If the index key aligns with the column(s) you frequently sort by, the database can retrieve data in sorted order without an extra sort operation, improving efficiency for range scans and ordered results.
Option 2: 'Manipulating data directly in SQL databases is often more efficient than exporting the data and transforming it locally in R or Python, especially for large datasets.' This is generally true for large datasets because performing filtering, aggregation, joins, and transformations inside the database reduces data transfer overhead, leverages query optimization, and uses database engine efficiencies. Transferring data out to external tools can introduce network latency, memory constraints, and duplicated computation, making the external approach slower for big workloads. However, note that this can depend on context, such as the complexity of operations, the capabilities of the SQL engine, and the efficiency of the external processing environment.
If a choice asks to select all that apply, both options are correct based on standard database and data engineering practices. Ensure you consider the specific database system and workload characteristics, but these statements align with common efficiency principles.

ECON3310001.1251 Quiz 11: Creating Databases

Which of the following statements about efficiency is true? Select all that apply.

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