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. It is the postmasters job to listener for incoming connections?

True

False

2 / 20

2. What is the purpose of the public schema?

no such schema

schema used for heterogeneous replication

restricted schema for postgres internal usage only

default schema for user objects

3 / 20

3. What is the name of the mechanism used to store a row bigger than a page size?

GROW

BAKE

BREAD

TOAST

4 / 20

4. Files are logically split into pages?

False

True

5 / 20

5. Which 3 databases exist directly after cluster initialization?

choose 3 options

template0

sysaux

postgres

template1

6 / 20

6. Which fork keeps track of available space within pages?

wal space map

vacuum space map

free space map

used space map

7 / 20

7. How many files or forks on disk will a 10Mb table with no index have?

8 / 20

8. 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

9 / 20

9. Postgres uses a thread based process model?

True

False

10 / 20

10. The pg_default tablespace should never be used to create user tables?

True

False

11 / 20

11. What is the purpose of the postgres database?

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

No such database

a template for all the other database

regular database that you can use at your discretion

12 / 20

12. Which fork is specific for unlogged tables?

Initialization fork

free space map

Main fork

visiblilty map

13 / 20

13. The information_schema schema provides information on Postgres release notes?

True

False

14 / 20

14. TOAST tables reside in a seperate schema?

True

False

15 / 20

15. Which of below are predefined schemas?

choose 2

system

postgres

pg_catalog

public

16 / 20

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

postman

pginit

init

postgres

17 / 20

17. Who is the Author of the Postgres 14 Internals book?

Egor Rogov

Sam Altman

Paul Sammy

Dan Brown

18 / 20

18. When PostgreSQL is running what can it be referred to as?

Choose 2 option

Aurora

Quorum

Instance

Postgres Server

19 / 20

19. Postgres server spawns a new backend session for each connection?

False

True

20 / 20

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

choose 3

indexes

tables

triggers

sequences

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. What is the default Isolation Level?

Serializable

Read Committed

Read Uncommitted

Repeatable Read

2 / 10

2. Which of the below would best describe a dirty read?

reading the data directly from file using a text editor such as vi or notepad

a session being able to see commited data altered by another session

reading data direct from memory using pg_dirt

a session being able to see uncommited data altered by another session

3 / 10

3. Data Consistency is best handled at the application layer rather than at the database layer?

True

False

4 / 10

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

CREATE EXTENSTION REPEATABLE_READ;

SET ISO=REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

ALTER SYSTEM SET ISO=REPEATABLE_READ;

5 / 10

5. The SQL standard specifies three isolation levels?

False

True

6 / 10

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

True

False

7 / 10

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

False

True

8 / 10

8. Which parameters sets the database default isolation level?

default_transaction_isolation

transaction_isolation_level

default_isolation_level

active_transaction_isolation

9 / 10

9. A phantom read anomaly occurs when?

The same transaction executes two identical queries returning a set of rows that satisfy a particular condition, while another transaction also queries this same data.

The same transactions issues a commit, then a rollback to restore data to its original value

A transactions inserts a null value into a not null columns and commits

The same transaction executes two identical queries returning a set of rows that satisfy a particular condition, while another transaction adds some other rows satisfying this condition and commits.

10 / 10

10. non-repeatable read anomaly occurs when?

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

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.

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. If a transaction aborts, all page changes are reverted(rolled back) in place?

True

False

2 / 10

2. CLOG Pages are never cached in memory?

False

True

3 / 10

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

True

False

4 / 10

4. UPDATE can be regarded as which 2 separate operations?

MERGE

DELETE

INSERT

COMMIT

5 / 10

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

False

True

6 / 10

6. To identify different versions of one and the same row, PostgreSQL marks each of them with which two value?

xmas

xid

xmax

xmin

7 / 10

7. indexes do not use row versioning?

False

True

8 / 10

8. Indexes values also support multi versioning with several versions of an index value existing at any point in time?

False

True

9 / 10

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

True

False

10 / 10

10. In Postgres, tables are often referred to as which of the below?

view

dump

heap

clog

Your score is

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