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

True

False

2 / 20

2. What is the purpose of the public schema?

restricted schema for postgres internal usage only

default schema for user objects

schema used for heterogeneous replication

no such schema

3 / 20

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

False

True

4 / 20

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

choose 3

sequences

triggers

tables

indexes

5 / 20

5. Which of below are predefined schemas?

choose 2

postgres

public

pg_catalog

system

6 / 20

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

False

True

7 / 20

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

pginit

init

postgres

postman

8 / 20

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

Access Path

Directory Path

Search Path

Schema Path

9 / 20

9. 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 creating development schemas

Useful for Postgres support Services to debug issues

10 / 20

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

Choose 2 option

Instance

Aurora

Postgres Server

Quorum

11 / 20

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

False

True

12 / 20

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

True

False

13 / 20

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

online redo logs (ORL)

rollback segments (RBS)

write-ahead log (WAL)

undo segments (UNDO)

14 / 20

14. Tablespaces are used to define physical data layout?

False

True

15 / 20

15. What is the purpose of autovacuum?

Performs a backup of WAL logs

Removes stale data from tables and indexes

Rebuilds indexes with b level greater than 2

Deletes old logs and traces on disk

16 / 20

16. What is a schema?

This is the same as a user in Postgres

A memory area used to cache data from LRU chains

The name used to refer to a super user account

Namespace that store all objects of a database

17 / 20

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

1MB

1GB

5MB

5GB

18 / 20

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

True

False

19 / 20

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

wal space map

free space map

used space map

vacuum space map

20 / 20

20. The default Page size is 2k?

True

False

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?

Read Uncommitted

Repeatable Read

Serializable

Read Committed

3 / 10

3. 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 issue a rollback.

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.

4 / 10

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

True

False

5 / 10

5. The SQL standard specifies three isolation levels?

True

False

6 / 10

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

SET ISO=REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

ALTER SYSTEM SET ISO=REPEATABLE_READ;

CREATE EXTENSTION REPEATABLE_READ;

7 / 10

7. Which parameters sets the database default isolation level?

default_isolation_level

active_transaction_isolation

transaction_isolation_level

default_transaction_isolation

8 / 10

8. Which of the below are valid Isolations Levels?

choose 2

Rollback Read

Random Scatter

Serializable

Read Committed

9 / 10

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

Repeatable Read

Serializable

Read Committed

Read Uncommitted

10 / 10

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

ACID

SOC2

SAFE

HIPPA

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. Which 2 items does a Virtual XID consist of?

xmin

checksum

sequential number

backend process ID

2 / 10

2. CLOG contains how many bits for each transaction?

3 / 10

3. What does an Item Pointer contain?

choose 3

tuple length

tuple offset from the start of the page

tuple xid

tuple status

4 / 10

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

False

True

5 / 10

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

pageinspect

pagesize

pageheadinfo

pagedetect

6 / 10

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

True

False

7 / 10

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

clog

heap

view

dump

8 / 10

8. a transaction containing a savepoint is will still be considered as only a single transaction?

True

False

9 / 10

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

False

True

10 / 10

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

True

False

Your score is

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