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. TOAST tables reside in a seperate schema?

True

False

2 / 20

2. Files are logically split into pages?

False

True

3 / 20

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

False

True

4 / 20

4. What is the name of the directory that contains the files related to the Postgres cluster?

PGBASE

PGTIPS

PGDATA

PGCORE

5 / 20

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

wal space map

used space map

free space map

vacuum space map

6 / 20

6. What is the purpose of the postgres database?

regular database that you can use at your discretion

No such database

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

a template for all the other database

7 / 20

7. Which fork is specific for unlogged tables?

Main fork

Initialization fork

free space map

visiblilty map

8 / 20

8. What is the purpose of the template0 database?

No such 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

9 / 20

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

choose 2

pg_default

pg_tablespace

pg_temp

pg_global

10 / 20

10. Which 3 databases exist directly after cluster initialization?

choose 3 options

template1

postgres

template0

sysaux

11 / 20

11. The information_schema schema provides information on Postgres release notes?

True

False

12 / 20

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

True

False

13 / 20

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

init

postman

postgres

pginit

14 / 20

14. The default Page size is 2k?

True

False

15 / 20

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

Directory Path

Schema Path

Search Path

Access Path

16 / 20

16. Each Database has its own System Catalog?

False

True

17 / 20

17. Which of below are predefined schemas?

choose 3

pg_schema

information_schema

pg_temp

pg_toast

18 / 20

18. What is the purpose of wal writer?

executes checkpoints

collects usage statistics for the instance.

writes WAL entries to disk

flushes dirty pages to disk.

19 / 20

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

Choose 2 option

Instance

Quorum

Postgres Server

Aurora

20 / 20

20. What is the purpose of the template1 database?

regular database that you can use at your discretion

a template for all the other databases

No such database

database used for temporary tables

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

reading data direct from memory using pg_dirt

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

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

reading the data directly from file using a text editor such as vi or notepad

2 / 10

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

HIPPA

SOC2

ACID

SAFE

3 / 10

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

True

False

4 / 10

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

Select more than 1 answer below:

Use a single SQL operator

Apply explicit locks

Issues a rollback after the commit to satisfy repeatable read.

Replace procedural code with declarative one.

5 / 10

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

choose 3

Read Uncommitted

Read Committed

Serializable

Repeatable Read

6 / 10

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

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. What is the default Isolation Level?

Repeatable Read

Read Uncommitted

Serializable

Read Committed

9 / 10

9. 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 twice, another transaction modifies this row between these reads issue a rollback.

A transaction reads one and the same row once and modifies this row and commits the change.

10 / 10

10. Which of the below are valid Isolations Levels?

choose 2

Rollback Read

Read Committed

Random Scatter

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

pagesize

pageheadinfo

pageinspect

pagedetect

2 / 10

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

MERGE

COMMIT

INSERT

DELETE

3 / 10

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

xid

xmax

xmin

xtime

4 / 10

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

False

True

5 / 10

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

redo log

commit log

transaction log

archive log

6 / 10

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

True

False

7 / 10

7. The page header stores checksum and the sizes of the other parts of the page?

True

False

8 / 10

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

True

False

9 / 10

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

False

True

10 / 10

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

xmax

xmin

xmas

xid

Your score is

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