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 purpose of the template0 database?

No such database

Useful for Postgres support Services to debug issues

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

Useful for creating development schemas

2 / 20

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

pg_symlinks

pg_tblspc

pg_tablespace

pg_tabspace

3 / 20

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

True

False

4 / 20

4. 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

5 / 20

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

Choose 2 option

Quorum

Aurora

Postgres Server

Instance

6 / 20

6. What is the purpose of the visibility map?

provides the data decryption key

shows referential relationships for tables

shows a page to be vacuumed or frozen

provides an audit trail for the database

7 / 20

7. Which 3 databases exist directly after cluster initialization?

choose 3 options

postgres

template1

sysaux

template0

8 / 20

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

True

False

9 / 20

9. What column in system catalogs servers as the Primary Key

oid#

obj

obj#

oid

10 / 20

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

choose 2

pg_global

pg_tablespace

pg_temp

pg_default

11 / 20

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

BAKE

TOAST

GROW

BREAD

12 / 20

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

False

True

13 / 20

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

CreatePGC

StartNewPG

CreateCluster

Initialize

14 / 20

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

pg_system

pg_class

pg_catalog

pg_tables

15 / 20

15. The default Page size is 2k?

False

True

16 / 20

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

write-ahead log (WAL)

rollback segments (RBS)

undo segments (UNDO)

online redo logs (ORL)

17 / 20

17. Each Database has its own System Catalog?

True

False

18 / 20

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

True

False

19 / 20

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

choose 3

triggers

tables

sequences

indexes

20 / 20

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

False

True

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?

SET ISO=REPEATABLE_READ;

BEGIN ISOLATION LEVEL REPEATABLE READ;

ALTER SYSTEM SET ISO=REPEATABLE_READ;

CREATE EXTENSTION REPEATABLE_READ;

2 / 10

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

True

False

3 / 10

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

HIPPA

SAFE

SOC2

ACID

4 / 10

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

False

True

5 / 10

5. Which parameters sets the database default isolation level?

default_transaction_isolation

default_isolation_level

active_transaction_isolation

transaction_isolation_level

6 / 10

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

True

False

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

a session being able to see uncommited 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

8 / 10

8. 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 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 once and modifies this row and commits the change.

9 / 10

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

True

False

10 / 10

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

choose 3

Repeatable Read

Serializable

Read Uncommitted

Read Committed

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

pageheadinfo

pagesize

pagedetect

pageinspect

2 / 10

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

True

False

3 / 10

3. Information about subtransactions is stored under?

PGDATA/subtrans

PGDATA/pg_min

PGDATA/pg_xid

PGDATA/pg_subtrans

4 / 10

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

False

True

5 / 10

5. When a row is created, its xmin value is set to the transaction ID of which command?

COMMIT

CREATE

INSERT

DELETE

6 / 10

6. CLOG files are stored in which directory?

PGDATA/clog

PGDATA/pg_xact

PGDATA/pg_clog

PGDATA/pg_commit

7 / 10

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

False

True

8 / 10

8. Which function can we use to find the current transaction ID?

pg_current_commit_id()

pg_current_xact_id()

pg_current_xmin_id()

pg_current_id()

9 / 10

9. at any one time Postgres can have several versions of a row?

False

True

10 / 10

10. What does an Item Pointer contain?

choose 3

tuple length

tuple status

tuple offset from the start of the page

tuple xid

Your score is

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