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. TOAST tables reside in a seperate schema?

False

True

2 / 20

2. What is a schema?

A memory area used to cache data from LRU chains

The name used to refer to a super user account

This is the same as a user in Postgres

Namespace that store all objects of a database

3 / 20

3. Users should not modify the template0 database

False

True

4 / 20

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

Initialize

CreateCluster

CreatePGC

StartNewPG

5 / 20

5. Postgres by default has built in connection pooling abilities?

False

True

6 / 20

6. What is the default standard size for a fork file?

1MB

1GB

5MB

5GB

7 / 20

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

False

True

8 / 20

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

False

True

9 / 20

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

choose 2

pg_temp

pg_tablespace

pg_default

pg_global

10 / 20

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

True

False

11 / 20

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

Choose 2 option

Aurora

Quorum

Postgres Server

Instance

12 / 20

12. Which fork is specific for unlogged tables?

visiblilty map

Main fork

free space map

Initialization fork

13 / 20

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

True

False

14 / 20

14. Files are logically split into pages?

True

False

15 / 20

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

postman

pginit

init

postgres

16 / 20

16. Tablespaces are used to define physical data layout?

True

False

17 / 20

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

True

False

18 / 20

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

True

False

19 / 20

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

pg_tablespace

pg_symlinks

pg_tblspc

pg_tabspace

20 / 20

20. 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

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

False

True

2 / 10

2. 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

reading data direct from memory using pg_dirt

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

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

3 / 10

3. The SQL standard specifies three isolation levels?

False

True

4 / 10

4. 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 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.

5 / 10

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

Repeatable Read

Read Uncommitted

Read Committed

Serializable

6 / 10

6. A phantom read anomaly occurs when?

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.

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 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

7 / 10

7. What is the default Isolation Level?

Repeatable Read

Serializable

Read Uncommitted

Read Committed

8 / 10

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

HIPPA

SOC2

SAFE

ACID

9 / 10

9. Which parameters sets the database default isolation level?

default_transaction_isolation

active_transaction_isolation

default_isolation_level

transaction_isolation_level

10 / 10

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

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

stored in PGDATA/itemptr directory

Each pointer uses 8 bytes

Each pointer uses 4 bytes

Also know as the pages table of contents

3 / 10

3. Information about subtransactions is stored under?

PGDATA/pg_subtrans

PGDATA/pg_min

PGDATA/subtrans

PGDATA/pg_xid

4 / 10

4. CLOG files are stored in which directory?

PGDATA/pg_commit

PGDATA/pg_clog

PGDATA/clog

PGDATA/pg_xact

5 / 10

5. Which 2 of the below represent transaction IDs used for row versioning?

xtime

xmin

xmax

xid

6 / 10

6. status of a subtransaction is written into CLOG?

False

True

7 / 10

7. CLOG contains how many bits for each transaction?

8 / 10

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

xmin

xid

xmax

xmas

9 / 10

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

False

True

10 / 10

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

archive log

redo log

commit log

transaction log

Your score is

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