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. Which fork is specific for unlogged tables?

Initialization fork

Main fork

free space map

visiblilty map

2 / 20

2. What is the name of the catalog that stores metadata for all cluster objects?

System Catalog

Sysaux Catalog

Sysasm Catalog

Sys Catalog

3 / 20

3. Files are logically split into pages?

True

False

4 / 20

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

True

False

5 / 20

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

True

False

6 / 20

6. Which 3 databases exist directly after cluster initialization?

choose 3 options

sysaux

postgres

template0

template1

7 / 20

7. Which of below are predefined schemas?

choose 2

postgres

system

pg_catalog

public

8 / 20

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

pg_tabspace

pg_symlinks

pg_tablespace

pg_tblspc

9 / 20

9. What is a schema?

This is the same as a user in Postgres

The name used to refer to a super user account

Namespace that store all objects of a database

A memory area used to cache data from LRU chains

10 / 20

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

11 / 20

11. What is the purpose of the template1 database?

a template for all the other databases

regular database that you can use at your discretion

database used for temporary tables

No such database

12 / 20

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

True

False

13 / 20

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

Egor Rogov

Dan Brown

Paul Sammy

Sam Altman

14 / 20

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

False

True

15 / 20

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

False

True

16 / 20

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

False

True

17 / 20

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

choose 3

triggers

indexes

sequences

tables

18 / 20

18. The default Page size is 2k?

True

False

19 / 20

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

PGTIPS

PGDATA

PGBASE

PGCORE

20 / 20

20. What is the purpose of the postgres database?

a template for all the other database

regular database that you can use at your discretion

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

No such database

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 statements will start a transaction as Read Repeatable?

CREATE EXTENSTION REPEATABLE_READ;

SET ISO=REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

ALTER SYSTEM SET ISO=REPEATABLE_READ;

2 / 10

2. A phantom read anomaly occurs when?

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

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.

3 / 10

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

True

False

4 / 10

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

False

True

5 / 10

5. The SQL standard specifies three isolation levels?

False

True

6 / 10

6. 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.

7 / 10

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

Serializable

Read Uncommitted

Read Committed

Repeatable Read

8 / 10

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

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

reading data direct from memory using pg_dirt

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

9 / 10

9. Which of the below are valid Isolations Levels?

choose 2

Rollback Read

Read Committed

Random Scatter

Serializable

10 / 10

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

ACID

SOC2

HIPPA

SAFE

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

True

False

2 / 10

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

True

False

3 / 10

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

False

True

4 / 10

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

True

False

5 / 10

5. CLOG Pages are never cached in memory?

False

True

6 / 10

6. CLOG files are stored in which directory?

PGDATA/pg_commit

PGDATA/clog

PGDATA/pg_xact

PGDATA/pg_clog

7 / 10

7. If a transaction is read only which kind of Transaction ID is it allocated?

temporary XID

virtual XID

heap XID

magic XID

8 / 10

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

archive log

transaction log

commit log

redo log

9 / 10

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

xmas

xid

xmin

xmax

10 / 10

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

False

True

Your score is

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