QuizApi - PostgreSQL Performance Optimization Techniques Quiz

Question 1

Correct Answers: 1/4

Which PostgreSQL configuration parameter has the most significant impact on query performance for complex joins?

work_mem

effective_cache_size

maintenance_work_mem

shared_buffers

Question 2

Correct Answers: 1/4

What is the most efficient index type for columns with low cardinality (few unique values)?

Bitmap index

GiST index

Hash index

B-tree index

Question 3

Correct Answers: 1/4

Which EXPLAIN ANALYZE output metric best indicates a potential performance problem with index usage?

Seq Scan on large tables

Index Only Scan

Parallel Seq Scan

Rows Removed by Filter

Question 4

Correct Answers: 1/4

What is the optimal fillfactor setting for a table with frequent updates to prevent bloat?

70-80

100

Question 5

Correct Answers: 1/4

Which approach provides the best performance for range queries on timestamp columns?

BRIN index with appropriate pages_per_range

GiST index

Hash index

Regular B-tree index

Question 6

Correct Answers: 1/4

What is the most effective way to optimize bulk inserts in PostgreSQL?

COPY command with indexes dropped

Individual row inserts

INSERT ... SELECT

Multiple INSERT statements

Question 7

Correct Answers: 1/4

Which monitoring query best identifies indexes that aren't providing value?

Query pg_stat_user_indexes join pg_stat_user_tables

Monitor WAL generation

Check index size

Query pg_stat_activity

Question 8

Correct Answers: 1/4

What is the most efficient way to prevent cache thrashing in PostgreSQL?

Size working set to fit in shared_buffers

Use temp tables

Disable caching

Increase shared_buffers

Question 9

Correct Answers: 1/4

Which setting most effectively prevents long-running queries from impacting system performance?

statement_timeout with resource groups

shared_buffers

work_mem

max_connections

Question 10

Correct Answers: 1/4

What is the most efficient way to handle vacuum on tables with frequent updates?

Autovacuum with table-specific thresholds

Daily maintenance window

Disable autovacuum

Manual VACUUM FULL regularly

Question 11

Correct Answers: 1/4

Which configuration best improves performance for write-heavy workloads?

Adjust wal_buffers and checkpoint_timeout

Increase max_wal_size

Enable synchronous_commit

Increase shared_buffers

Question 12

Correct Answers: 1/4

What is the most effective method to optimize partitioned table performance?

Enable partition pruning with appropriate constraints

Merge partitions

Use smaller partitions

Create more partitions

Question 13

Correct Answers: 1/4

Which approach provides the best performance for frequently accessed lookup tables?

UNLOGGED tables with appropriate indexes

Views

Temporary tables

Regular tables

Question 14

Correct Answers: 1/4

What is the most effective way to optimize sequential scans on large tables?

Adjust effective_io_concurrency and maintenance_io_concurrency

Use VACUUM FULL

Add more indexes

Increase work_mem

Question 15

Correct Answers: 1/4

Which technique most effectively improves performance of repeated complex queries?

Use materialized views with concurrent refresh

Cache in application

Use temporary tables

Create regular views

Question 1

Which PostgreSQL configuration parameter has the most significant impact on query performance for complex joins?

Question 2

What is the most efficient index type for columns with low cardinality (few unique values)?

Question 3

Which EXPLAIN ANALYZE output metric best indicates a potential performance problem with index usage?

Question 4

What is the optimal fillfactor setting for a table with frequent updates to prevent bloat?

Question 5

Which approach provides the best performance for range queries on timestamp columns?

Question 6

What is the most effective way to optimize bulk inserts in PostgreSQL?

Question 7

Which monitoring query best identifies indexes that aren't providing value?

Question 8

What is the most efficient way to prevent cache thrashing in PostgreSQL?

Question 9

Which setting most effectively prevents long-running queries from impacting system performance?

Question 10

What is the most efficient way to handle vacuum on tables with frequent updates?

Question 11

Which configuration best improves performance for write-heavy workloads?

Question 12

What is the most effective method to optimize partitioned table performance?

Question 13

Which approach provides the best performance for frequently accessed lookup tables?

Question 14

What is the most effective way to optimize sequential scans on large tables?

Question 15

Which technique most effectively improves performance of repeated complex queries?

Finish Quiz