[Solved] You created a partial index:CREATE INDEX idx_active_products ON products (price) WHERE available = true;After running queries filtering on available = true, you notice the index is not used.... | PostgreSQL

PostgreSQL - Indexing Strategies

You created a partial index:
CREATE INDEX idx_active_products ON products (price) WHERE available = true;
After running queries filtering on available = true, you notice the index is not used. What could be the problem?

AThe statistics are outdated; running ANALYZE may help.

BPartial indexes cannot be used on boolean columns.

CThe index must be created with UNIQUE keyword to be used.

DPostgreSQL does not support partial indexes on numeric columns.

Step-by-Step Solution

Solution:

Step 1: Understand index usage
Partial indexes can be used on boolean and numeric columns without UNIQUE.
Step 2: Consider query planner behavior
If statistics are outdated, PostgreSQL may not choose the index; running ANALYZE updates stats.
Final Answer:
The statistics are outdated; running ANALYZE may help. -> Option A
Quick Check:
Update stats to enable partial index use = A [OK]

Quick Trick: Run ANALYZE to refresh stats for index usage [OK]

Common Mistakes:

Believing partial indexes can't be on boolean columns
Thinking UNIQUE is required for partial indexes
Assuming numeric columns are unsupported

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You created a partial index:

Step 1: Understand index usage

Step 2: Consider query planner behavior

Final Answer:

Quick Check:

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