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 3 databases exist directly after cluster initialization?

choose 3 options

sysaux

template0

template1

postgres

2 / 20

2. Users should not modify the template0 database

False

True

3 / 20

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

False

True

4 / 20

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

postgres

init

pginit

postman

5 / 20

5. What is the purpose of the template1 database?

database used for temporary tables

a template for all the other databases

regular database that you can use at your discretion

No such database

6 / 20

6. How does Postgres know which schema to use if not specified?

Schema Path

Access Path

Search Path

Directory Path

7 / 20

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

False

True

8 / 20

8. Which of below are predefined schemas?

choose 3

pg_schema

information_schema

pg_toast

pg_temp

9 / 20

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

Choose 2 option

Instance

Quorum

Postgres Server

Aurora

10 / 20

10. What is the point of the pg_global tablespace?

stores temporary tables that are common to the whole cluster

stores system catalog objects that are common to the whole cluster

stores WAL logs used for global replication

stores user tables that are common to the whole cluster

11 / 20

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

True

False

12 / 20

12. What is another name for the postgres process?

masterprocess

postmaster

postmanager

aurora

13 / 20

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

True

False

14 / 20

14. Which of below are predefined schemas?

choose 2

postgres

system

pg_catalog

public

15 / 20

15. What is the purpose of the template0 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

No such database

16 / 20

16. Which fork is specific for unlogged tables?

visiblilty map

Main fork

Initialization fork

free space map

17 / 20

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

obj#

oid#

obj

oid

18 / 20

18. Which fork contains the actual table data?

table map

visiblilty map

Main fork

free space map

19 / 20

19. How many rows in a page does Postgres aim to have before considering TOAST?

20 / 20

20. Tablespaces can be used to segregate data based on performance needs?

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. What is the default Isolation Level?

Serializable

Read Committed

Repeatable Read

Read Uncommitted

2 / 10

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

choose 3

Serializable

Read Uncommitted

Repeatable Read

Read Committed

3 / 10

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

Read Committed

Repeatable Read

Serializable

Read Uncommitted

4 / 10

4. The SQL standard specifies three isolation levels?

True

False

5 / 10

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

True

False

6 / 10

6. 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;

7 / 10

7. 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.

8 / 10

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

Select more than 1 answer below:

Issues a rollback after the commit to satisfy repeatable read.

Use a single SQL operator

Replace procedural code with declarative one.

Apply explicit locks

9 / 10

9. Which of the below are valid Isolations Levels?

choose 2

Random Scatter

Read Committed

Rollback Read

Serializable

10 / 10

10. Which parameters sets the database default isolation level?

transaction_isolation_level

active_transaction_isolation

default_isolation_level

default_transaction_isolation

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

view

heap

dump

clog

3 / 10

3. Tuples can also be referred to as columns?

True

False

4 / 10

4. When a transaction is committed Postgres uses a special <replace with answer> structure?

commit log

redo log

archive log

transaction log

5 / 10

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

True

False

6 / 10

6. What does an Item Pointer contain?

choose 3

tuple xid

tuple offset from the start of the page

tuple status

tuple length

7 / 10

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

False

True

8 / 10

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

CREATE

DELETE

COMMIT

INSERT

9 / 10

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

stored in PGDATA/itemptr directory

Each pointer uses 8 bytes

Also know as the pages table of contents

Each pointer uses 4 bytes

10 / 10

10. status of a subtransaction is written into CLOG?

False

True

Your score is

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