Postgres Quiz Archive

You have 200 seconds to answer 20 Random questions so think fast!

You will need to score 80% or over to pass!

Created by

Paul Sammy

PostgreSQL 14 Internals Chapter 1

A quiz to test the knowledge of those reading and learning from Postgres 14 Internals book by Egor Rogov, covering topics in Chapter 1.

1 / 20

1. To be able to restore data consistency, Postgres maintains

online redo logs (ORL)

undo segments (UNDO)

write-ahead log (WAL)

rollback segments (RBS)

2 / 20

2. What is the purpose of the template1 database?

No such database

database used for temporary tables

regular database that you can use at your discretion

a template for all the other databases

3 / 20

3. What is another name for the postgres process?

postmanager

masterprocess

aurora

postmaster

4 / 20

4. What is the purpose of the visibility map?

shows a page to be vacuumed or frozen

provides the data decryption key

provides an audit trail for the database

shows referential relationships for tables

5 / 20

5. Which of below are predefined schemas?

choose 2

postgres

public

system

pg_catalog

6 / 20

6. Tablespaces can be used to segregate data based on performance needs?

True

False

7 / 20

7. What is the default standard size for a fork file?

1GB

5MB

5GB

1MB

8 / 20

8. Which of the below objects can be referred to as relations?

choose 3

triggers

tables

sequences

indexes

9 / 20

9. What is the name of the 2 default tablespaces created after initialization?

choose 2

pg_default

pg_global

pg_tablespace

pg_temp

10 / 20

10. What command is used to create the Postgres cluster?

CreateCluster

CreatePGC

StartNewPG

Initialize

11 / 20

11. What is the process first launched at server start?

postman

pginit

postgres

init

12 / 20

12. Users should not modify the template0 database

False

True

13 / 20

13. How many rows in a page does Postgres aim to have before considering TOAST?

14 / 20

14. What is a schema?

This is the same as a user in Postgres

A memory area used to cache data from LRU chains

Namespace that store all objects of a database

The name used to refer to a super user account

15 / 20

15. pg_catalog schema is used to store system catalog tables?

False

True

16 / 20

16. The default Page size is 2k?

False

True

17 / 20

17. What is the purpose of the template0 database?

Useful for restoring data from a logical backup or creating a database with a different encoding

No such database

Useful for Postgres support Services to debug issues

Useful for creating development schemas

18 / 20

18. What is the purpose of wal writer?

flushes dirty pages to disk.

collects usage statistics for the instance.

executes checkpoints

writes WAL entries to disk

19 / 20

19. A Postgres cluster consists of 2 or more physical servers accessing one Postgres Instance?

True

False

20 / 20

20. Postgres uses a thread based process model?

True

False

Your score is

Created by

Paul Sammy

PostgreSQL 14 Internals Chapter 2

A quiz to test the knowledge of those reading and learning from Postgres 14 Internals book by Egor Rogov, covering topics in Chapter 2.

1 / 10

1. Which parameters sets the database default isolation level?

transaction_isolation_level

default_isolation_level

default_transaction_isolation

active_transaction_isolation

2 / 10

2. What is the acronym used for the attributes that ensure Data consistency, integrity and durability?

SOC2

SAFE

ACID

HIPPA

3 / 10

3. Which of the below are valid Isolations Levels?

choose 2

Rollback Read

Random Scatter

Serializable

Read Committed

4 / 10

4. At any moment the database system can contain several versions of one and the same row?

True

False

5 / 10

5. The SQL standard specifies three isolation levels?

True

False

6 / 10

6. The more locks a transaction acquires, the better it is isolated from other transactions?

True

False

7 / 10

7. Based on Snapshot Isolation use of MVCC which of the below are permitted?

choose 3

Serializable

Read Uncommitted

Read Committed

Repeatable Read

8 / 10

8. non-repeatable read anomaly occurs when?

A transaction reads one and the same row twice, another transaction modifies this row between these reads and commits the change.

A transaction reads one and the same row once and modifies this row and commits the change.

A transaction reads one and the same row twice, another transaction modifies this row between these reads issue a rollback.

A transaction reads one and the same row once, another transaction modifies this row between these reads and commits the change.

9 / 10

9. which of the below statements will start a transaction as Read Repeatable?

SET ISO=REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

ALTER SYSTEM SET ISO=REPEATABLE_READ;

CREATE EXTENSTION REPEATABLE_READ;

10 / 10

10. Lost updates are forbidden by the standard at all isolation levels?

False

True

Your score is

Created by

Paul Sammy

PostgreSQL 14 Internals Chapter 3

A quiz to test the knowledge of those reading and learning from Postgres 14 Internals book by Egor Rogov, covering topics in Chapter 3.

1 / 10

1. Each page has a layer that usually consists of?

choose 2

page header

undo segment

flashback block

free space

2 / 10

2. Page header sizes can be easily displayed using the <choose from answers> extension

pagedetect

pagesize

pageheadinfo

pageinspect

3 / 10

3. at any one time Postgres can have several versions of a row?

True

False

4 / 10

4. psql provides a special mode that allows you to continue a transaction after a failure?

False

True

5 / 10

5. Page free space can often become fragmented?

True

False

6 / 10

6. index row headers like table row headers contain xmin and xmax fields?

False

True

7 / 10

7. Which 2 of the below represent transaction IDs used for row versioning?

xmax

xtime

xmin

xid

8 / 10

8. Tuples can also be referred to as columns?

False

True

9 / 10

9. status of a subtransaction is written into CLOG?

False

True

10 / 10

10. Rows of TOAST tables are handled in such a way that they are never update?

False

True

Your score is

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