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 process first launched at server start?

postgres

init

postman

pginit

2 / 20

2. Each tablespaces can only be assigned for use by one database

False

True

3 / 20

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

Paul Sammy

Dan Brown

Sam Altman

Egor Rogov

4 / 20

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

False

True

5 / 20

5. 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

6 / 20

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

False

True

7 / 20

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

5GB

5MB

1MB

1GB

8 / 20

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

wal space map

vacuum space map

free space map

used space map

9 / 20

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

10 / 20

10. What is the purpose of the template1 database?

regular database that you can use at your discretion

No such database

a template for all the other databases

database used for temporary tables

11 / 20

11. What is another name for the postgres process?

postmaster

aurora

masterprocess

postmanager

12 / 20

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

pg_system

pg_tables

pg_class

pg_catalog

13 / 20

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

choose 3

indexes

tables

triggers

sequences

14 / 20

14. 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

15 / 20

15. Which 3 databases exist directly after cluster initialization?

choose 3 options

template0

postgres

template1

sysaux

16 / 20

16. The default Page size is 2k?

True

False

17 / 20

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

choose 2

pg_default

pg_tablespace

pg_global

pg_temp

18 / 20

18. Postgres uses a thread based process model?

True

False

19 / 20

19. Each Database has its own System Catalog?

False

True

20 / 20

20. Which fork is specific for unlogged tables?

free space map

visiblilty map

Initialization fork

Main fork

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

False

True

2 / 10

2. non-repeatable read anomaly occurs when?

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 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.

3 / 10

3. What is the default Isolation Level?

Serializable

Repeatable Read

Read Committed

Read Uncommitted

4 / 10

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

True

False

5 / 10

5. What are some of database features we can use to avoid a non repeatable read?

Select more than 1 answer below:

Issues a rollback after the commit to satisfy repeatable read.

Replace procedural code with declarative one.

Use a single SQL operator

Apply explicit locks

6 / 10

6. 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

7 / 10

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

SOC2

ACID

SAFE

HIPPA

8 / 10

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

True

False

9 / 10

9. Which parameters sets the database default isolation level?

default_transaction_isolation

active_transaction_isolation

default_isolation_level

transaction_isolation_level

10 / 10

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

CREATE EXTENSTION REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

SET ISO=REPEATABLE_READ;

ALTER SYSTEM SET ISO=REPEATABLE_READ;

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

False

True

2 / 10

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

False

True

3 / 10

3. status of a subtransaction is written into CLOG?

False

True

4 / 10

4. When a transaction is committed Postgres uses a special <replace with answer> structure?

redo log

archive log

transaction log

commit log

5 / 10

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

xmax

xmas

xid

xmin

6 / 10

6. The page header is located in the highest address?

False

True

7 / 10

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

INSERT

DELETE

MERGE

COMMIT

8 / 10

8. CLOG contains how many bits for each transaction?

9 / 10

9. Which of the below are true about a Pages Item Pointer?

Each pointer uses 8 bytes

Also know as the pages table of contents

stored in PGDATA/itemptr directory

Each pointer uses 4 bytes

10 / 10

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

True

False

Your score is

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