[Solved] What does the idx_scan column in pg_stat_user_indexes represent? — Ans: The number of times an index was used in a scan operation | PostgreSQL

PostgreSQL - Indexing Strategies

What does the idx_scan column in pg_stat_user_indexes represent?

AThe number of times an index was used in a scan operation

BThe total size of the index in bytes

CThe number of rows in the indexed table

DThe creation date of the index

Step-by-Step Solution

Solution:

Step 1: Understand the purpose of pg_stat_user_indexes
This system view tracks usage statistics for user-created indexes in PostgreSQL.
Step 2: Identify the meaning of idx_scan
The idx_scan column counts how many times the index was used in scan operations, showing its usage frequency.
Final Answer:
The number of times an index was used in a scan operation -> Option A
Quick Check:
idx_scan = index usage count [OK]

Quick Trick: Remember idx_scan counts index scans, not size or rows [OK]

Common Mistakes:

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What does the idx_scan column in pg_stat_user_indexes represent?