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

True

False

2 / 20

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

choose 3

triggers

indexes

tables

sequences

3 / 20

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

choose 2

pg_temp

pg_global

pg_default

pg_tablespace

4 / 20

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

False

True

5 / 20

5. What command is used to create the Postgres cluster?

Initialize

CreateCluster

StartNewPG

CreatePGC

6 / 20

6. The default Page size is 2k?

False

True

7 / 20

7. Postgres by default has built in connection pooling abilities?

True

False

8 / 20

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

9 / 20

9. What is the purpose of the postgres database?

a template for all the other database

No such database

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

regular database that you can use at your discretion

10 / 20

10. Who is the Author of the Postgres 14 Internals book?

Paul Sammy

Egor Rogov

Sam Altman

Dan Brown

11 / 20

11. What is the purpose of the visibility map?

shows a page to be vacuumed or frozen

provides the data decryption key

provides an audit trail for the database

shows referential relationships for tables

12 / 20

12. Files are logically split into pages?

False

True

13 / 20

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

postman

postgres

pginit

init

14 / 20

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

15 / 20

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

pg_tabspace

pg_symlinks

pg_tablespace

pg_tblspc

16 / 20

16. What is the purpose of the template1 database?

a template for all the other databases

No such database

database used for temporary tables

regular database that you can use at your discretion

17 / 20

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

PGTIPS

PGDATA

PGCORE

PGBASE

18 / 20

18. What is a schema?

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

This is the same as a user in Postgres

19 / 20

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

False

True

20 / 20

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

pg_system

pg_tables

pg_class

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. The SQL standard specifies three isolation levels?

True

False

2 / 10

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

False

True

3 / 10

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

Read Uncommitted

Repeatable Read

Serializable

Read Committed

4 / 10

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

CREATE EXTENSTION REPEATABLE_READ;

SET ISO=REPEATABLE_READ;

ALTER SYSTEM SET ISO=REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

5 / 10

5. Which parameters sets the database default isolation level?

transaction_isolation_level

default_transaction_isolation

active_transaction_isolation

default_isolation_level

6 / 10

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

SOC2

SAFE

ACID

HIPPA

7 / 10

7. A phantom read anomaly occurs when?

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.

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

8 / 10

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

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

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

9 / 10

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

Select more than 1 answer below:

Issues a rollback after the commit to satisfy repeatable read.

Replace procedural code with declarative one.

Use a single SQL operator

Apply explicit locks

10 / 10

10. Which of the below are valid Isolations Levels?

choose 2

Read Committed

Serializable

Random Scatter

Rollback Read

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. virtual IDs exist only in PGDATA/pg_vxid when not cached?

True

False

2 / 10

2. CLOG contains how many bits for each transaction?

3 / 10

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

True

False

4 / 10

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

xmas

xid

xmin

xmax

5 / 10

5. Page free space can often become fragmented?

False

True

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?

False

True

8 / 10

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

False

True

9 / 10

9. 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()

10 / 10

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

sequential number

checksum

xmin

backend process ID

Your score is

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