[Solved] You have a materialized view mv_orders created as CREATE MATERIALIZED VIEW mv_orders AS SELECT * FROM orders;.... What is the most likely cause? | PostgreSQL

PostgreSQL - Views and Materialized Views

You have a materialized view mv_orders created as CREATE MATERIALIZED VIEW mv_orders AS SELECT * FROM orders;. You try to refresh it using REFRESH MATERIALIZED VIEW mv_orders; but get an error: ERROR: permission denied for relation orders. What is the most likely cause?

AThe user running the refresh lacks SELECT permission on the base table orders

BThe materialized view name is misspelled

CREFRESH MATERIALIZED VIEW syntax is incorrect

DMaterialized views cannot be refreshed after creation

Step-by-Step Solution

Solution:

Step 1: Understand permission requirements for refreshing
Refreshing a materialized view requires SELECT permission on the underlying base tables.
Step 2: Analyze the error message
The error says permission denied on relation orders, indicating the user lacks SELECT rights on that table.
Final Answer:
The user running the refresh lacks SELECT permission on the base table orders -> Option A
Quick Check:
Permission denied = missing SELECT rights [OK]

Quick Trick: Check base table permissions if refresh gives permission denied [OK]

Common Mistakes:

Assuming syntax error instead of permission issue
Ignoring user privileges on base tables
Thinking materialized views cannot be refreshed

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What is the most likely cause?

Step 1: Understand permission requirements for refreshing

Step 2: Analyze the error message

Final Answer:

Quick Check:

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