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

Choose 2 option

Instance

Postgres Server

Aurora

Quorum

2 / 20

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

BREAD

TOAST

GROW

BAKE

3 / 20

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

False

True

4 / 20

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

False

True

5 / 20

5. Users should not modify the template0 database

True

False

6 / 20

6. Which of below are predefined schemas?

choose 3

pg_schema

pg_temp

information_schema

pg_toast

7 / 20

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

8 / 20

8. What is the purpose of the postgres database?

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

a template for all the other database

No such database

regular database that you can use at your discretion

9 / 20

9. Which of below are predefined schemas?

choose 2

public

system

postgres

pg_catalog

10 / 20

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

Sam Altman

Egor Rogov

Paul Sammy

Dan Brown

11 / 20

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

pg_tblspc

pg_symlinks

pg_tablespace

pg_tabspace

12 / 20

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

System Catalog

Sysaux Catalog

Sys Catalog

Sysasm Catalog

13 / 20

13. What is the purpose of the template1 database?

No such database

database used for temporary tables

regular database that you can use at your discretion

a template for all the other databases

14 / 20

14. What is the purpose of the visibility map?

provides an audit trail for the database

shows referential relationships for tables

shows a page to be vacuumed or frozen

provides the data decryption key

15 / 20

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

False

True

16 / 20

16. Which fork contains the actual table data?

visiblilty map

table map

free space map

Main fork

17 / 20

17. What is a schema?

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

This is the same as a user in Postgres

18 / 20

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

True

False

19 / 20

19. What is the point of the pg_global tablespace?

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

stores system catalog objects that are common to the whole cluster

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. 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.

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

2 / 10

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

True

False

3 / 10

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

True

False

4 / 10

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

SOC2

HIPPA

SAFE

ACID

5 / 10

5. non-repeatable read anomaly occurs when?

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 issue a rollback.

A transaction reads one and the same row twice, another transaction modifies this row between these reads and commits the change.

6 / 10

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

SET ISO=REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

CREATE EXTENSTION REPEATABLE_READ;

ALTER SYSTEM SET ISO=REPEATABLE_READ;

7 / 10

7. 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

8 / 10

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

True

False

9 / 10

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

choose 3

Repeatable Read

Read Committed

Serializable

Read Uncommitted

10 / 10

10. Which parameters sets the database default isolation level?

active_transaction_isolation

default_transaction_isolation

transaction_isolation_level

default_isolation_level

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

False

True

2 / 10

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

True

False

3 / 10

3. The page header is located in the highest address?

True

False

4 / 10

4. CLOG Pages are never cached in memory?

True

False

5 / 10

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

False

True

6 / 10

6. Information about subtransactions is stored under?

PGDATA/pg_xid

PGDATA/pg_subtrans

PGDATA/subtrans

PGDATA/pg_min

7 / 10

7. Page free space can often become fragmented?

True

False

8 / 10

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

True

False

9 / 10

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

virtual XID

magic XID

temporary XID

heap XID

10 / 10

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

True

False

Your score is

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