PostgreSQL - Indexing Strategies
Which column in
pg_stat_user_indexes indicates how many times an index was used for scanning?Which column in pg_stat_user_indexes indicates how many times an index was used for scanning?
easy📝 Conceptual Q2 of 15
Step-by-Step Solution
Solution:
Step 1: Identify the column that counts index scans
Theidx_scancolumn counts how many times an index was used for scanning.Step 2: Differentiate from other columns
idx_tup_readandidx_tup_fetchcount tuples read and fetched, not scan counts.relidis the table ID.Final Answer:
idx_scan -> Option AQuick Check:
Index scan count = idx_scan [OK]
Quick Trick: idx_scan counts how often an index is scanned [OK]
Common Mistakes:
- Confusing idx_tup_read with scan count
- Choosing relid which is a table identifier
- Mixing up idx_tup_fetch with scan count
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