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

postman

pginit

init

2 / 20

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

True

False

3 / 20

3. What is the point of the pg_global tablespace?

stores user tables that are common to the whole cluster

stores temporary tables that are common to the whole cluster

stores WAL logs used for global replication

stores system catalog objects that are common to the whole cluster

4 / 20

4. What is the purpose of autovacuum?

Deletes old logs and traces on disk

Rebuilds indexes with b level greater than 2

Removes stale data from tables and indexes

Performs a backup of WAL logs

5 / 20

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

free space map

used space map

vacuum space map

wal space map

6 / 20

6. Postgres uses a thread based process model?

False

True

7 / 20

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

True

False

8 / 20

8. If we create a new tablespace which directory will symbolic links be created from?

pg_symlinks

pg_tblspc

pg_tabspace

pg_tablespace

9 / 20

9. Which 3 databases exist directly after cluster initialization?

choose 3 options

postgres

sysaux

template1

template0

10 / 20

10. What is another name for the postgres process?

masterprocess

postmaster

aurora

postmanager

11 / 20

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

12 / 20

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

True

False

13 / 20

13. What is the name of the mechanism used to store a row bigger than a page size?

TOAST

GROW

BREAD

BAKE

14 / 20

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

choose 3

indexes

tables

triggers

sequences

15 / 20

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

False

True

16 / 20

16. Each Database has its own System Catalog?

True

False

17 / 20

17. Which fork is specific for unlogged tables?

visiblilty map

Main fork

free space map

Initialization fork

18 / 20

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

online redo logs (ORL)

rollback segments (RBS)

write-ahead log (WAL)

undo segments (UNDO)

19 / 20

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

True

False

20 / 20

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

pg_tables

pg_class

pg_system

pg_catalog

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 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 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.

2 / 10

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

False

True

3 / 10

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

ALTER SYSTEM SET ISO=REPEATABLE_READ;

SET ISO=REPEATABLE_READ;

CREATE EXTENSTION REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

4 / 10

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

True

False

5 / 10

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

Repeatable Read

Read Committed

Read Uncommitted

Serializable

6 / 10

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

ACID

SOC2

SAFE

HIPPA

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

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 adds some other rows satisfying this condition 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. Which of the below are valid Isolations Levels?

choose 2

Read Committed

Random Scatter

Rollback Read

Serializable

9 / 10

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

False

True

10 / 10

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

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

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 uncommited data altered by another session

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

True

False

2 / 10

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

xmas

xmin

xmax

xid

3 / 10

3. Information about subtransactions is stored under?

PGDATA/pg_min

PGDATA/pg_subtrans

PGDATA/subtrans

PGDATA/pg_xid

4 / 10

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

True

False

5 / 10

5. Which 2 items does a Virtual XID consist of?

xmin

sequential number

checksum

backend process ID

6 / 10

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

True

False

7 / 10

7. Tuples can also be referred to as columns?

True

False

8 / 10

8. CLOG contains how many bits for each transaction?

9 / 10

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

dump

view

clog

heap

10 / 10

10. Indexes values also support multi versioning with several versions of an index value existing at any point in time?

True

False

Your score is

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