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?

effective_cache_size

work_mem

shared_buffers

maintenance_work_mem

Question 2

Correct Answers: 1/4

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

GiST index

Bitmap index

B-tree index

Hash index

Question 3

Correct Answers: 1/4

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

Index Only Scan

Seq Scan on large tables

Rows Removed by Filter

Parallel Seq Scan

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?

GiST index

BRIN index with appropriate pages_per_range

Regular B-tree index

Hash index

Question 6

Correct Answers: 1/4

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

Individual row inserts

COPY command with indexes dropped

Multiple INSERT statements

INSERT ... SELECT

Question 7

Correct Answers: 1/4

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

Monitor WAL generation

Query pg_stat_user_indexes join pg_stat_user_tables

Query pg_stat_activity

Check index size

Question 8

Correct Answers: 1/4

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

Use temp tables

Size working set to fit in shared_buffers

Increase shared_buffers

Disable caching

Question 9

Correct Answers: 1/4

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

shared_buffers

statement_timeout with resource groups

max_connections

work_mem

Question 10

Correct Answers: 1/4

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

Daily maintenance window

Autovacuum with table-specific thresholds

Manual VACUUM FULL regularly

Disable autovacuum

Question 11

Correct Answers: 1/4

Which configuration best improves performance for write-heavy workloads?

Increase max_wal_size

Adjust wal_buffers and checkpoint_timeout

Increase shared_buffers

Enable synchronous_commit

Question 12

Correct Answers: 1/4

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

Merge partitions

Enable partition pruning with appropriate constraints

Create more partitions

Use smaller partitions

Question 13

Correct Answers: 1/4

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

Views

UNLOGGED tables with appropriate indexes

Regular tables

Temporary tables

Question 14

Correct Answers: 1/4

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

Use VACUUM FULL

Adjust effective_io_concurrency and maintenance_io_concurrency

Increase work_mem

Add more indexes

Question 15

Correct Answers: 1/4

Which technique most effectively improves performance of repeated complex queries?

Cache in application

Use materialized views with concurrent refresh

Create regular views

Use temporary tables

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