Consider the following command: REFRESH MATERIALIZED VIEW CONCURRENTLY sales_data; Which of these is a possible reason for an error when running this command?

medium📝 Debug Q14 of 15

PostgreSQL - Views and Materialized Views

Consider the following command: REFRESH MATERIALIZED VIEW CONCURRENTLY sales_data; Which of these is a possible reason for an error when running this command?

AThe command is missing a semicolon.

BThe materialized view name is misspelled.

CThe base tables have no data.

DThe materialized view does not have a unique index.

Step-by-Step Solution

Solution:

Step 1: Understand CONCURRENTLY option requirements
REFRESH MATERIALIZED VIEW CONCURRENTLY requires the materialized view to have a unique index to avoid locking issues.
Step 2: Analyze error causes
If the unique index is missing, the command will fail. Misspelling causes different errors, empty base tables do not cause errors, and missing semicolon is a syntax error but not typical here.
Final Answer:
The materialized view does not have a unique index. -> Option D
Quick Check:
CONCURRENTLY needs unique index [OK]

Quick Trick: CONCURRENTLY requires unique index on materialized view [OK]

Common Mistakes:

Ignoring unique index requirement for CONCURRENTLY
Assuming empty tables cause refresh errors
Overlooking spelling mistakes as main error

Master "Views and Materialized Views" in PostgreSQL

9 interactive learning modes - each teaches the same concept differently

Learn Why Deep Visual Try Challenge Project Recall Time

Want More Practice?

15+ quiz questions · All difficulty levels · Free

Free Signup - Practice All Questions

Consider the following command: REFRESH MATERIALIZED VIEW CONCURRENTLY sales_data; Which of these is a possible reason for an error when running this command?

Step 1: Understand CONCURRENTLY option requirements

Step 2: Analyze error causes

Final Answer:

Quick Check:

Want More Practice?