After running REFRESH MATERIALIZED VIEW mv_report;, you notice the query takes a long time and blocks other queries. What could be a reason and how to fix it?

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PostgreSQL - Views and Materialized Views

After running REFRESH MATERIALIZED VIEW mv_report;, you notice the query takes a long time and blocks other queries. What could be a reason and how to fix it?

AThe materialized view is corrupted; drop and recreate it

BThe database is in read-only mode; restart the server

CThe base tables are missing indexes; add indexes to speed up refresh

DThe refresh locks the view; use CONCURRENTLY option to avoid blocking

Step-by-Step Solution

Solution:

Step 1: Understand locking behavior of refresh
Standard refresh locks the materialized view, blocking other queries.
Step 2: Identify solution
Using REFRESH MATERIALIZED VIEW CONCURRENTLY avoids locking and blocking.
Final Answer:
The refresh locks the view; use CONCURRENTLY option to avoid blocking -> Option D
Quick Check:
Use CONCURRENTLY to prevent blocking = The refresh locks the view; use CONCURRENTLY option to avoid blocking [OK]

Quick Trick: Use CONCURRENTLY to refresh without blocking queries [OK]

Common Mistakes:

Assuming corruption causes slow refresh
Thinking base table indexes affect refresh locking
Restarting server unnecessarily

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After running REFRESH MATERIALIZED VIEW mv_report;, you notice the query takes a long time and blocks other queries. What could be a reason and how to fix it?

Step 1: Understand locking behavior of refresh

Step 2: Identify solution

Final Answer:

Quick Check:

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