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 another name for the postgres process?

aurora

masterprocess

postmanager

postmaster

2 / 20

2. Which of below are predefined schemas?

choose 3

pg_toast

information_schema

pg_schema

pg_temp

3 / 20

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

False

True

4 / 20

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

postman

postgres

init

pginit

5 / 20

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

True

False

6 / 20

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

choose 3

tables

sequences

indexes

triggers

7 / 20

7. System Catalog tables begin with which prefix?

sys_

pg_

cat_

dba_

8 / 20

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

PGTIPS

PGCORE

PGBASE

PGDATA

9 / 20

9. Which of below are predefined schemas?

choose 2

system

postgres

pg_catalog

public

10 / 20

10. Users should not modify the template0 database

True

False

11 / 20

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

choose 2

pg_global

pg_tablespace

pg_default

pg_temp

12 / 20

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

GROW

TOAST

BREAD

BAKE

13 / 20

13. Each Database has its own System Catalog?

True

False

14 / 20

14. What is the purpose of the visibility map?

shows referential relationships for tables

shows a page to be vacuumed or frozen

provides an audit trail for the database

provides the data decryption key

15 / 20

15. TOAST tables reside in a seperate schema?

True

False

16 / 20

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

Choose 2 option

Postgres Server

Quorum

Aurora

Instance

17 / 20

17. Which fork is specific for unlogged tables?

Initialization fork

Main fork

visiblilty map

free space map

18 / 20

18. Tablespaces are used to define physical data layout?

True

False

19 / 20

19. Files are logically split into pages?

True

False

20 / 20

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

Egor Rogov

Sam Altman

Dan Brown

Paul Sammy

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 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 also queries this same data.

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.

2 / 10

2. Which parameters sets the database default isolation level?

active_transaction_isolation

transaction_isolation_level

default_transaction_isolation

default_isolation_level

3 / 10

3. What is the default Isolation Level?

Serializable

Read Committed

Repeatable Read

Read Uncommitted

4 / 10

4. 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 and modifies this row 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.

5 / 10

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

False

True

6 / 10

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

BEGIN ISOLATION LEVEL REPEATABLE READ;

CREATE EXTENSTION REPEATABLE_READ;

SET ISO=REPEATABLE_READ;

ALTER SYSTEM SET ISO=REPEATABLE_READ;

7 / 10

7. Which of the below are valid Isolations Levels?

choose 2

Serializable

Rollback Read

Read Committed

Random Scatter

8 / 10

8. 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.

Apply explicit locks

Issues a rollback after the commit to satisfy repeatable read.

Use a single SQL operator

9 / 10

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

True

False

10 / 10

10. The SQL standard specifies three isolation levels?

True

False

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. Which of the below are true about a Pages Item Pointer?

stored in PGDATA/itemptr directory

Also know as the pages table of contents

Each pointer uses 8 bytes

Each pointer uses 4 bytes

2 / 10

2. UPDATE can be regarded as which 2 separate operations?

INSERT

MERGE

COMMIT

DELETE

3 / 10

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

True

False

4 / 10

4. CLOG files are stored in which directory?

PGDATA/pg_commit

PGDATA/pg_xact

PGDATA/clog

PGDATA/pg_clog

5 / 10

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

True

False

6 / 10

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

COMMIT

DELETE

INSERT

CREATE

7 / 10

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

False

True

8 / 10

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

False

True

9 / 10

9. Page free space can often become fragmented?

True

False

10 / 10

10. What does an Item Pointer contain?

choose 3

tuple length

tuple offset from the start of the page

tuple xid

tuple status

Your score is

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