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May 31, 2026 · 1 min read

Can you describe how indexing affects query performance in a relational database and express the time complexity of a query with and without an index?

Indexing can significantly improve query performance by reducing the amount of data the database engine needs to scan. Without an index, a query may have O(n) time complexity, as it…

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📅 May 31, 2026 ⏱ 1 min read

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Can you describe how indexing affects query performance in a relational database and express the time complexity of a query with and without an index?

COVER // CAN YOU DESCRIBE HOW INDEXING AFFECTS QUERY PERFORMANCE IN A RELATIONAL DATABASE AND EXPRESS THE TIME COMPLEXITY OF A QUERY WITH AND WITHOUT AN INDEX?

Indexing can significantly improve query performance by reducing the amount of data the database engine needs to scan. Without an index, a query may have O(n) time complexity, as it may need to examine all rows, while with an appropriate index, this can reduce to O(log n) for search operations.

databases indexing performance sql

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