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

False

True

2 / 20

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

False

True

3 / 20

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

CreateCluster

StartNewPG

CreatePGC

Initialize

4 / 20

4. What is the point of the pg_global tablespace?

stores WAL logs used for global replication

stores system catalog objects that are common to the whole cluster

stores temporary tables that are common to the whole cluster

stores user tables that are common to the whole cluster

5 / 20

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

False

True

6 / 20

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

postgres

pginit

postman

init

7 / 20

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

choose 3

triggers

sequences

indexes

tables

8 / 20

8. What is the purpose of the postgres database?

a template for all the other database

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

regular database that you can use at your discretion

No such database

9 / 20

9. Users should not modify the template0 database

True

False

10 / 20

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

Sam Altman

Paul Sammy

Egor Rogov

Dan Brown

11 / 20

11. TOAST tables reside in a seperate schema?

False

True

12 / 20

12. What is the purpose of wal writer?

flushes dirty pages to disk.

writes WAL entries to disk

collects usage statistics for the instance.

executes checkpoints

13 / 20

13. Which of below are predefined schemas?

choose 3

pg_schema

information_schema

pg_temp

pg_toast

14 / 20

14. Files are logically split into pages?

True

False

15 / 20

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

PGCORE

PGDATA

PGTIPS

PGBASE

16 / 20

16. Which fork contains the actual table data?

visiblilty map

table map

free space map

Main fork

17 / 20

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

True

False

18 / 20

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

pg_symlinks

pg_tablespace

pg_tabspace

pg_tblspc

19 / 20

19. Which of below are predefined schemas?

choose 2

public

pg_catalog

system

postgres

20 / 20

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

True

False

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

Select more than 1 answer below:

Replace procedural code with declarative one.

Issues a rollback after the commit to satisfy repeatable read.

Apply explicit locks

Use a single SQL operator

2 / 10

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

choose 3

Read Committed

Read Uncommitted

Repeatable Read

Serializable

3 / 10

3. The SQL standard specifies three isolation levels?

False

True

4 / 10

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

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

reading data direct from memory using pg_dirt

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

5 / 10

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

True

False

6 / 10

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

Serializable

Repeatable Read

Read Uncommitted

Read Committed

7 / 10

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

False

True

8 / 10

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

False

True

9 / 10

9. What is the default Isolation Level?

Repeatable Read

Read Uncommitted

Serializable

Read Committed

10 / 10

10. 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 twice, 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.

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. CLOG Pages are never cached in memory?

False

True

2 / 10

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

True

False

3 / 10

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

True

False

4 / 10

4. psql provides a special mode that allows you to continue a transaction after a failure?

True

False

5 / 10

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

xmin

xmas

xmax

xid

6 / 10

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

False

True

7 / 10

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

False

True

8 / 10

8. CLOG contains how many bits for each transaction?

9 / 10

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

True

False

10 / 10

10. In Postgres, tables are often referred to as which of the below?

clog

dump

heap

view

Your score is

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