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. What is the purpose of the public schema?

schema used for heterogeneous replication

default schema for user objects

restricted schema for postgres internal usage only

no such schema

2 / 20

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

init

postman

postgres

pginit

3 / 20

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

write-ahead log (WAL)

undo segments (UNDO)

online redo logs (ORL)

rollback segments (RBS)

4 / 20

4. What 3 files/forks as a minimum make up a table on disk?

Main fork

table map

visiblilty map

free space map

5 / 20

5. How does Postgres know which schema to use if not specified?

Search Path

Directory Path

Access Path

Schema Path

6 / 20

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

wal space map

vacuum space map

used space map

free space map

7 / 20

7. What is the name of the system catalog table for relations?

pg_tables

pg_class

pg_catalog

pg_system

8 / 20

8. Postgres by default has built in connection pooling abilities?

True

False

9 / 20

9. The default Page size is 2k?

False

True

10 / 20

10. Which 3 databases exist directly after cluster initialization?

choose 3 options

template0

template1

sysaux

postgres

11 / 20

11. What is another name for the postgres process?

masterprocess

postmaster

postmanager

aurora

12 / 20

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

Choose 2 option

Aurora

Quorum

Postgres Server

Instance

13 / 20

13. What is the point of the pg_global tablespace?

stores temporary tables that are common to the whole cluster

stores WAL logs used for global replication

stores system catalog objects that are common to the whole cluster

stores user tables that are common to the whole cluster

14 / 20

14. What is the purpose of the postgres database?

a template for all the other database

No such database

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

regular database that you can use at your discretion

15 / 20

15. What is the purpose of wal writer?

flushes dirty pages to disk.

writes WAL entries to disk

collects usage statistics for the instance.

executes checkpoints

16 / 20

16. What is the purpose of the template0 database?

Useful for Postgres support Services to debug issues

Useful for creating development schemas

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

No such database

17 / 20

17. A schema can belong to more than one database?

False

True

18 / 20

18. Which fork contains the actual table data?

visiblilty map

free space map

Main fork

table map

19 / 20

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

Paul Sammy

Egor Rogov

Sam Altman

Dan Brown

20 / 20

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

choose 3

tables

indexes

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

True

False

2 / 10

2. Which of the below are valid Isolations Levels?

choose 2

Random Scatter

Serializable

Read Committed

Rollback Read

3 / 10

3. 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.

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.

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

4 / 10

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

False

True

5 / 10

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

ALTER SYSTEM SET ISO=REPEATABLE_READ;

CREATE EXTENSTION REPEATABLE_READ;

SET ISO=REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

6 / 10

6. 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 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 issue a rollback.

7 / 10

7. Which isolation level in theory could mean an application does not have to consider isolation anomalies?

Repeatable Read

Read Uncommitted

Serializable

Read Committed

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

False

True

10 / 10

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

HIPPA

ACID

SOC2

SAFE

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. The page Special Space is located at the start of the page with highest address

True

False

2 / 10

2. When a row is created, its xmin value is set to the transaction ID of which command?

COMMIT

INSERT

CREATE

DELETE

3 / 10

3. A page along with its tuples is read into the buffer cache with compression transformations to enhance cache efficiency?

True

False

4 / 10

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

choose 2

free space

flashback block

page header

undo segment

5 / 10

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

False

True

6 / 10

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

True

False

7 / 10

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

False

True

8 / 10

8. Tuples can also be referred to as columns?

True

False

9 / 10

9. Postgres table physical data files are always cross compatible across platforms?

True

False

10 / 10

10. Which 2 items does a Virtual XID consist of?

sequential number

xmin

backend process ID

checksum

Your score is

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