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

2 / 20

2. What is the purpose of the postgres database?

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

a template for all the other database

regular database that you can use at your discretion

No such database

3 / 20

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

True

False

4 / 20

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

Schema Path

Access Path

Search Path

Directory Path

5 / 20

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

6 / 20

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

True

False

7 / 20

7. To understand each other, a client and a server must use one and the same interfacing protocol?

True

False

8 / 20

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

False

True

9 / 20

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

used space map

wal space map

free space map

vacuum space map

10 / 20

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

True

False

11 / 20

11. What is the purpose of wal writer?

collects usage statistics for the instance.

executes checkpoints

flushes dirty pages to disk.

writes WAL entries to disk

12 / 20

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

choose 2

pg_global

pg_default

pg_tablespace

pg_temp

13 / 20

13. Files are logically split into pages?

True

False

14 / 20

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

pginit

postman

postgres

init

15 / 20

15. 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

16 / 20

16. Which of below are predefined schemas?

choose 3

pg_temp

pg_schema

information_schema

pg_toast

17 / 20

17. Which 3 databases exist directly after cluster initialization?

choose 3 options

sysaux

template0

postgres

template1

18 / 20

18. 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

19 / 20

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

pg_catalog

pg_class

pg_tables

pg_system

20 / 20

20. What is another name for the postgres process?

postmanager

aurora

postmaster

masterprocess

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. What is the default Isolation Level?

Serializable

Read Uncommitted

Repeatable Read

Read Committed

3 / 10

3. 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.

4 / 10

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

False

True

5 / 10

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

SAFE

HIPPA

ACID

SOC2

6 / 10

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

SET ISO=REPEATABLE_READ;

CREATE EXTENSTION REPEATABLE_READ;

ALTER SYSTEM SET ISO=REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

7 / 10

7. A phantom read anomaly occurs when?

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

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.

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 also queries this same data.

8 / 10

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

False

True

9 / 10

9. Which of the below are valid Isolations Levels?

choose 2

Rollback Read

Read Committed

Serializable

Random Scatter

10 / 10

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

Repeatable Read

Read Committed

Serializable

Read Uncommitted

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

free space

page header

undo segment

flashback block

2 / 10

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

True

False

3 / 10

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

xmax

xtime

xmin

xid

4 / 10

4. Which function can we use to find the current transaction ID?

pg_current_xmin_id()

pg_current_id()

pg_current_commit_id()

pg_current_xact_id()

5 / 10

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

True

False

6 / 10

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

xmin

xid

xmas

xmax

7 / 10

7. Tuples can also be referred to as columns?

False

True

8 / 10

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

pageinspect

pagesize

pagedetect

pageheadinfo

9 / 10

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

False

True

10 / 10

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

False

True

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.