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. Postgres by default has built in connection pooling abilities?

False

True

2 / 20

2. Which of below are predefined schemas?

choose 2

system

postgres

public

pg_catalog

3 / 20

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

Egor Rogov

Paul Sammy

Sam Altman

Dan Brown

4 / 20

4. Postgres uses a thread based process model?

True

False

5 / 20

5. Some System Catalog tables are common to all databases in the cluster?

True

False

6 / 20

6. What is the purpose of the postgres database?

a template for all the other database

No such database

regular database that you can use at your discretion

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

7 / 20

7. Which of below are predefined schemas?

choose 3

pg_temp

information_schema

pg_schema

pg_toast

8 / 20

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

False

True

9 / 20

9. What is a schema?

A memory area used to cache data from LRU chains

The name used to refer to a super user account

This is the same as a user in Postgres

Namespace that store all objects of a database

10 / 20

10. System Catalog tables begin with which prefix?

cat_

dba_

pg_

sys_

11 / 20

11. Files are logically split into pages?

True

False

12 / 20

12. The default Page size is 2k?

True

False

13 / 20

13. Each Database has its own System Catalog?

True

False

14 / 20

14. TOAST tables reside in a seperate schema?

True

False

15 / 20

15. Which fork is specific for unlogged tables?

Initialization fork

visiblilty map

Main fork

free space map

16 / 20

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

pg_tables

pg_catalog

pg_system

pg_class

17 / 20

17. What column in system catalogs servers as the Primary Key

obj#

obj

oid#

oid

18 / 20

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

Schema Path

Access Path

Directory Path

Search Path

19 / 20

19. Users should not modify the template0 database

True

False

20 / 20

20. Which fork contains the actual table data?

Main fork

table map

free space map

visiblilty map

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. 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, 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.

2 / 10

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

SET ISO=REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

CREATE EXTENSTION REPEATABLE_READ;

ALTER SYSTEM SET ISO=REPEATABLE_READ;

3 / 10

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

reading data direct from memory using pg_dirt

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

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

4 / 10

4. Which parameters sets the database default isolation level?

transaction_isolation_level

default_isolation_level

default_transaction_isolation

active_transaction_isolation

5 / 10

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

False

True

6 / 10

6. What is the default Isolation Level?

Serializable

Repeatable Read

Read Committed

Read Uncommitted

7 / 10

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

False

True

8 / 10

8. Snapshot isolation is preferred but increases the number of required locks?

True

False

9 / 10

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

HIPPA

SAFE

SOC2

ACID

10 / 10

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

choose 3

Read Committed

Read Uncommitted

Repeatable Read

Serializable

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. Information about subtransactions is stored under?

PGDATA/pg_xid

PGDATA/pg_min

PGDATA/subtrans

PGDATA/pg_subtrans

2 / 10

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

True

False

3 / 10

3. CLOG Pages are never cached in memory?

True

False

4 / 10

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

True

False

5 / 10

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

True

False

6 / 10

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

True

False

7 / 10

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

False

True

8 / 10

8. virtual IDs exist only in PGDATA/pg_vxid when not cached?

True

False

9 / 10

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

False

True

10 / 10

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

pageheadinfo

pageinspect

pagesize

pagedetect

Your score is

Cookie	Duration	Description
cookielawinfo-checkbox-analytics	11 months	This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Analytics".
cookielawinfo-checkbox-functional	11 months	The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional".
cookielawinfo-checkbox-necessary	11 months	This cookie is set by GDPR Cookie Consent plugin. The cookies is used to store the user consent for the cookies in the category "Necessary".
cookielawinfo-checkbox-others	11 months	This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Other.
cookielawinfo-checkbox-performance	11 months	This cookie is set by GDPR Cookie Consent plugin. The cookie is used to store the user consent for the cookies in the category "Performance".
viewed_cookie_policy	11 months	The cookie is set by the GDPR Cookie Consent plugin and is used to store whether or not user has consented to the use of cookies. It does not store any personal data.