[Solved] Which of the following best describes when a partial index is used by PostgreSQL during a query? — Ans: When the query's WHERE clause matches the partial index condition. | PostgreSQL

PostgreSQL - Indexing Strategies

Which of the following best describes when a partial index is used by PostgreSQL during a query?

AFor every query on the table regardless of conditions.

BWhen the query's <code>WHERE</code> clause matches the partial index condition.

COnly when the table has less than 1000 rows.

DWhen the query uses aggregate functions.

Step-by-Step Solution

Solution:

Step 1: Understand index usage
PostgreSQL uses a partial index only if the query's WHERE clause matches the index's condition.
Step 2: Evaluate options
The option stating 'When the query's WHERE clause matches the partial index condition.' correctly states this; others are unrelated or incorrect.
Final Answer:
When the query's WHERE clause matches the partial index condition. -> Option B
Quick Check:
Partial index usage = A [OK]

Quick Trick: Partial indexes help only if query filters match index condition [OK]

Common Mistakes:

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Which of the following best describes when a partial index is used by PostgreSQL during a query?