[Solved] If queries using a GIN index on a JSONB column metadata are still slow, what is a likely reason? — Ans: The queries use operators not supported by the GIN index | PostgreSQL

PostgreSQL - Indexing Strategies

If queries using a GIN index on a JSONB column metadata are still slow, what is a likely reason?

AThe GIN index was created with the wrong column data type

BThe queries use operators not supported by the GIN index

CThe JSONB column contains only scalar values

DThe table has too few rows for indexing to help

Step-by-Step Solution

Solution:

Step 1: Identify supported operators for GIN on JSONB
GIN indexes support containment (@>), existence (?), and some other operators but not all JSONB operators.
Step 2: Analyze query slowness cause
If queries use unsupported operators, the index won't be used, causing slow performance.
Final Answer:
The queries use operators not supported by the GIN index -> Option B
Quick Check:
Are unsupported operators used? If yes, index won't help. [OK]

Quick Trick: Unsupported operators prevent GIN index usage [OK]

Common Mistakes:

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If queries using a GIN index on a JSONB column metadata are still slow, what is a likely reason?