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 of below are predefined schemas?

choose 3

pg_schema

pg_temp

information_schema

pg_toast

2 / 20

2. Which fork contains the actual table data?

Main fork

free space map

visiblilty map

table map

3 / 20

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

GROW

TOAST

BAKE

BREAD

4 / 20

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

True

False

5 / 20

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

obj#

oid#

obj

oid

6 / 20

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

False

True

7 / 20

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

PGCORE

PGDATA

PGTIPS

PGBASE

8 / 20

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

True

False

9 / 20

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

postman

pginit

postgres

init

10 / 20

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

False

True

11 / 20

11. Each Database has its own System Catalog?

True

False

12 / 20

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

StartNewPG

CreatePGC

CreateCluster

Initialize

13 / 20

13. System Catalog tables begin with which prefix?

sys_

dba_

cat_

pg_

14 / 20

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

visiblilty map

Main fork

table map

free space map

15 / 20

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

False

True

16 / 20

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

False

True

17 / 20

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

18 / 20

18. The default Page size is 2k?

True

False

19 / 20

19. What is the purpose of the template1 database?

database used for temporary tables

No such database

a template for all the other databases

regular database that you can use at your discretion

20 / 20

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

rollback segments (RBS)

undo segments (UNDO)

write-ahead log (WAL)

online redo logs (ORL)

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

choose 3

Read Committed

Repeatable Read

Read Uncommitted

Serializable

2 / 10

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

False

True

3 / 10

3. 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 commited data altered by another session

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

4 / 10

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

HIPPA

ACID

SOC2

SAFE

5 / 10

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

Read Uncommitted

Serializable

Read Committed

Repeatable Read

6 / 10

6. The SQL standard specifies three isolation levels?

False

True

7 / 10

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

BEGIN ISOLATION LEVEL REPEATABLE READ;

ALTER SYSTEM SET ISO=REPEATABLE_READ;

CREATE EXTENSTION REPEATABLE_READ;

SET ISO=REPEATABLE_READ;

8 / 10

8. Which parameters sets the database default isolation level?

default_isolation_level

transaction_isolation_level

active_transaction_isolation

default_transaction_isolation

9 / 10

9. 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 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.

10 / 10

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

False

True

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

False

True

2 / 10

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

True

False

3 / 10

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

False

True

4 / 10

4. Page free space can often become fragmented?

False

True

5 / 10

5. What does an Item Pointer contain?

choose 3

tuple length

tuple offset from the start of the page

tuple status

tuple xid

6 / 10

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

pageinspect

pagesize

pageheadinfo

pagedetect

7 / 10

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

True

False

8 / 10

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

True

False

9 / 10

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

xmin

checksum

backend process ID

sequential number

10 / 10

10. Tuples can also be referred to as columns?

False

True

Your score is

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