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

False

True

2 / 20

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

False

True

3 / 20

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

False

True

4 / 20

4. A single Postgres Instance can server only one database?

False

True

5 / 20

5. What is the purpose of autovacuum?

Rebuilds indexes with b level greater than 2

Deletes old logs and traces on disk

Performs a backup of WAL logs

Removes stale data from tables and indexes

6 / 20

6. Which of below are predefined schemas?

choose 2

pg_catalog

public

postgres

system

7 / 20

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

BAKE

GROW

TOAST

BREAD

8 / 20

8. What is the point of the pg_global tablespace?

stores system catalog objects that are common to the whole cluster

stores temporary tables that are common to the whole cluster

stores user tables that are common to the whole cluster

stores WAL logs used for global replication

9 / 20

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

init

postgres

postman

pginit

10 / 20

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

pg_symlinks

pg_tblspc

pg_tabspace

pg_tablespace

11 / 20

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

True

False

12 / 20

12. Files are logically split into pages?

True

False

13 / 20

13. Which of below are predefined schemas?

choose 3

pg_schema

pg_temp

information_schema

pg_toast

14 / 20

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

Choose 2 option

Postgres Server

Quorum

Aurora

Instance

15 / 20

15. Which 3 databases exist directly after cluster initialization?

choose 3 options

template0

template1

sysaux

postgres

16 / 20

16. What is the purpose of the public schema?

restricted schema for postgres internal usage only

default schema for user objects

no such schema

schema used for heterogeneous replication

17 / 20

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

False

True

18 / 20

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

False

True

19 / 20

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

True

False

20 / 20

20. What 3 files/forks as a minimum make up a table on disk?

table map

visiblilty map

free space map

Main fork

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. What is the default Isolation Level?

Read Committed

Serializable

Repeatable Read

Read Uncommitted

2 / 10

2. 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 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.

3 / 10

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

True

False

4 / 10

4. Data Consistency is best handled at the application layer rather than at the database layer?

True

False

5 / 10

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

Read Uncommitted

Read Committed

Repeatable Read

Serializable

6 / 10

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

HIPPA

SOC2

SAFE

ACID

7 / 10

7. The SQL standard specifies three isolation levels?

False

True

8 / 10

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

True

False

9 / 10

9. 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 also queries this same data.

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.

10 / 10

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

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

reading data direct from memory using pg_dirt

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

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 of the below are true about a Pages Item Pointer?

stored in PGDATA/itemptr directory

Each pointer uses 8 bytes

Each pointer uses 4 bytes

Also know as the pages table of contents

2 / 10

2. What does an Item Pointer contain?

choose 3

tuple length

tuple status

tuple xid

tuple offset from the start of the page

3 / 10

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

xmin

checksum

sequential number

backend process ID

4 / 10

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

pageinspect

pageheadinfo

pagedetect

pagesize

5 / 10

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

True

False

6 / 10

6. status of a subtransaction is written into CLOG?

True

False

7 / 10

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

False

True

8 / 10

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

True

False

9 / 10

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

False

True

10 / 10

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

dump

view

heap

clog

Your score is

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